# HG changeset patch
# User tron
# Date 1144653358 0
# Node ID 35d747bb5e82ed33eaaedbfeb4730c755350f6ef
# Parent  d53bc3e794bdacee5e6d432af927869d686d75c0
(svn r4342) Change the first two parameters of commands - virtual pixel coordinates of the tile to operate on - to a TileIndex
Remove DoCommandByTile(), because now it does the same as DoCommand()

diff -r d53bc3e794bd -r 35d747bb5e82 ai/ai.c
--- a/ai/ai.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/ai/ai.c	Mon Apr 10 07:15:58 2006 +0000
@@ -96,7 +96,7 @@
 		tmp_cmdtext = strdup(_cmd_text);
 
 	/* First, do a test-run to see if we can do this */
-	res = DoCommandByTile(tile, p1, p2, flags & ~DC_EXEC, procc);
+	res = DoCommand(tile, p1, p2, flags & ~DC_EXEC, procc);
 	/* The command failed, or you didn't want to execute, or you are quering, return */
 	if ((CmdFailed(res)) || !(flags & DC_EXEC) || (flags & DC_QUERY_COST)) {
 		if (tmp_cmdtext != NULL)
diff -r d53bc3e794bd -r 35d747bb5e82 ai/default/default.c
--- a/ai/default/default.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/ai/default/default.c	Mon Apr 10 07:15:58 2006 +0000
@@ -146,7 +146,7 @@
 			continue;
 		}
 
-		ret = DoCommandByTile(tile, i, 0, 0, CMD_BUILD_RAIL_VEHICLE);
+		ret = DoCommand(tile, i, 0, 0, CMD_BUILD_RAIL_VEHICLE);
 		if (!CmdFailed(ret) && ret <= money &&
 				rvi->ai_rank >= best_veh_score) {
 			best_veh_score = rvi->ai_rank;
@@ -172,7 +172,7 @@
 		if (!HASBIT(e->player_avail, _current_player) || e->reliability < 0x8A3D)
 			continue;
 
-		ret = DoCommandByTile(tile, i, 0, 0, CMD_BUILD_ROAD_VEH);
+		ret = DoCommand(tile, i, 0, 0, CMD_BUILD_ROAD_VEH);
 		if (!CmdFailed(ret) && ret <= money && ret >= best_veh_cost) {
 			best_veh_cost = ret;
 			best_veh_index = i;
@@ -203,7 +203,7 @@
 			if (i>=253) continue;
 		}
 
-		ret = DoCommandByTile(0, i, 0, DC_QUERY_COST, CMD_BUILD_AIRCRAFT);
+		ret = DoCommand(0, i, 0, DC_QUERY_COST, CMD_BUILD_AIRCRAFT);
 		if (!CmdFailed(ret) && ret <= money && ret >= best_veh_cost) {
 			best_veh_cost = ret;
 			best_veh_index = i;
@@ -271,7 +271,7 @@
 static void AiHandleGotoDepot(Player *p, int cmd)
 {
 	if (p->ai.cur_veh->current_order.type != OT_GOTO_DEPOT)
-		DoCommandByTile(0, p->ai.cur_veh->index, 0, DC_EXEC, cmd);
+		DoCommand(0, p->ai.cur_veh->index, 0, DC_EXEC, cmd);
 
 	if (++p->ai.state_counter <= 1387) {
 		p->ai.state = AIS_VEH_DO_REPLACE_VEHICLE;
@@ -314,13 +314,13 @@
 		BackupVehicleOrders(v, orderbak);
 		tile = v->tile;
 
-		if (!CmdFailed(DoCommandByTile(0, v->index, 2, DC_EXEC, CMD_SELL_RAIL_WAGON)) &&
-			  !CmdFailed(DoCommandByTile(tile, veh, 0, DC_EXEC, CMD_BUILD_RAIL_VEHICLE)) ) {
+		if (!CmdFailed(DoCommand(0, v->index, 2, DC_EXEC, CMD_SELL_RAIL_WAGON)) &&
+			  !CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_RAIL_VEHICLE)) ) {
 			VehicleID veh = _new_train_id;
 			AiRestoreVehicleOrders(GetVehicle(veh), orderbak);
-			DoCommandByTile(0, veh, 0, DC_EXEC, CMD_START_STOP_TRAIN);
-
-			DoCommandByTile(0, veh, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
+			DoCommand(0, veh, 0, DC_EXEC, CMD_START_STOP_TRAIN);
+
+			DoCommand(0, veh, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
 		}
 	}
 }
@@ -343,13 +343,13 @@
 		BackupVehicleOrders(v, orderbak);
 		tile = v->tile;
 
-		if (!CmdFailed(DoCommandByTile(0, v->index, 0, DC_EXEC, CMD_SELL_ROAD_VEH)) &&
-			  !CmdFailed(DoCommandByTile(tile, veh, 0, DC_EXEC, CMD_BUILD_ROAD_VEH)) ) {
+		if (!CmdFailed(DoCommand(0, v->index, 0, DC_EXEC, CMD_SELL_ROAD_VEH)) &&
+			  !CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_ROAD_VEH)) ) {
 			VehicleID veh = _new_roadveh_id;
 			AiRestoreVehicleOrders(GetVehicle(veh), orderbak);
-			DoCommandByTile(0, veh, 0, DC_EXEC, CMD_START_STOP_ROADVEH);
-
-			DoCommandByTile(0, veh, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
+			DoCommand(0, veh, 0, DC_EXEC, CMD_START_STOP_ROADVEH);
+
+			DoCommand(0, veh, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
 		}
 	}
 }
@@ -372,13 +372,13 @@
 		BackupVehicleOrders(v, orderbak);
 		tile = v->tile;
 
-		if (!CmdFailed(DoCommandByTile(0, v->index, 0, DC_EXEC, CMD_SELL_AIRCRAFT)) &&
-			  !CmdFailed(DoCommandByTile(tile, veh, 0, DC_EXEC, CMD_BUILD_AIRCRAFT)) ) {
+		if (!CmdFailed(DoCommand(0, v->index, 0, DC_EXEC, CMD_SELL_AIRCRAFT)) &&
+			  !CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_AIRCRAFT)) ) {
 			VehicleID veh = _new_aircraft_id;
 			AiRestoreVehicleOrders(GetVehicle(veh), orderbak);
-			DoCommandByTile(0, veh, 0, DC_EXEC, CMD_START_STOP_AIRCRAFT);
-
-			DoCommandByTile(0, veh, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
+			DoCommand(0, veh, 0, DC_EXEC, CMD_START_STOP_AIRCRAFT);
+
+			DoCommand(0, veh, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
 		}
 	}
 }
@@ -1552,10 +1552,10 @@
 		if (p->mode < 2) {
 			if (p->mode == 0) {
 				// Depot
-				ret = DoCommandByTile(c, _cur_ai_player->ai.railtype_to_use, p->attr, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_TRAIN_DEPOT);
+				ret = DoCommand(c, _cur_ai_player->ai.railtype_to_use, p->attr, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_TRAIN_DEPOT);
 			} else {
 				// Station
-				ret = DoCommandByTile(c, (p->attr&1) | (p->attr>>4)<<8 | (p->attr>>1&7)<<16, _cur_ai_player->ai.railtype_to_use, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_RAILROAD_STATION);
+				ret = DoCommand(c, (p->attr&1) | (p->attr>>4)<<8 | (p->attr>>1&7)<<16, _cur_ai_player->ai.railtype_to_use, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_RAILROAD_STATION);
 			}
 
 			if (CmdFailed(ret)) return CMD_ERROR;
@@ -1579,7 +1579,7 @@
 			for (i = 0; i != 6; i++, j >>= 1) {
 				if (j&1) {
 					k = i;
-					ret = DoCommandByTile(c, _cur_ai_player->ai.railtype_to_use, i, flag | DC_AUTO | DC_NO_WATER, CMD_BUILD_SINGLE_RAIL);
+					ret = DoCommand(c, _cur_ai_player->ai.railtype_to_use, i, flag | DC_AUTO | DC_NO_WATER, CMD_BUILD_SINGLE_RAIL);
 					if (CmdFailed(ret)) return CMD_ERROR;
 					total_cost += ret;
 				}
@@ -1593,7 +1593,7 @@
 				if (flag & DC_EXEC) {
 					j = 4 - j;
 					do {
-						ret = DoCommandByTile(c, k, 0, flag, CMD_BUILD_SIGNALS);
+						ret = DoCommand(c, k, 0, flag, CMD_BUILD_SIGNALS);
 					} while (--j);
 				} else {
 					ret = _price.build_signals;
@@ -1605,12 +1605,12 @@
 			//Clear stuff and then build single rail.
 			if (GetTileSlope(c,NULL) != 0)
 				return CMD_ERROR;
-			ret = DoCommandByTile(c, 0, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_LANDSCAPE_CLEAR);
+			ret = DoCommand(c, 0, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_LANDSCAPE_CLEAR);
 			if (CmdFailed(ret)) return CMD_ERROR;
 			total_cost += ret + _price.build_rail;
 
 			if (flag & DC_EXEC) {
-				DoCommandByTile(c, _cur_ai_player->ai.railtype_to_use, p->attr&1, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_SINGLE_RAIL);
+				DoCommand(c, _cur_ai_player->ai.railtype_to_use, p->attr&1, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_SINGLE_RAIL);
 			}
 
 			goto clear_town_stuff;
@@ -1701,11 +1701,11 @@
 	if (slope != 0) {
 		if (mode > 0 || (mode == 0 && !(r & 0xC))) {
 			// Terraform up
-			DoCommandByTile(tile, _terraform_up_flags[slope - 1], 1,
+			DoCommand(tile, _terraform_up_flags[slope - 1], 1,
 				DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_TERRAFORM_LAND);
 		} else if (h != 0) {
 			// Terraform down
-			DoCommandByTile(tile, _terraform_down_flags[slope - 1], 0,
+			DoCommand(tile, _terraform_down_flags[slope - 1], 0,
 				DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_TERRAFORM_LAND);
 		}
 	}
@@ -1947,7 +1947,7 @@
 		}
 
 		// Is building a (rail)bridge possible at this place (type doesn't matter)?
-		if (CmdFailed(DoCommandByTile(tile_new, tile, 0 | arf->player->ai.railtype_to_use << 8,
+		if (CmdFailed(DoCommand(tile_new, tile, 0 | arf->player->ai.railtype_to_use << 8,
 			DC_AUTO, CMD_BUILD_BRIDGE)) )
 				return;
 		AiBuildRailRecursive(arf, tile_new, dir2);
@@ -1965,7 +1965,7 @@
 	uint z;
 
 	if (GetTileSlope(tile, &z) == _dir_table_2[p[0] & 3] && z != 0) {
-		int32 cost = DoCommandByTile(tile, arf->player->ai.railtype_to_use, 0, DC_AUTO, CMD_BUILD_TUNNEL);
+		int32 cost = DoCommand(tile, arf->player->ai.railtype_to_use, 0, DC_AUTO, CMD_BUILD_TUNNEL);
 
 		if (!CmdFailed(cost) && cost <= (arf->player->player_money>>4)) {
 			AiBuildRailRecursive(arf, _build_tunnel_endtile, p[0]&3);
@@ -2024,7 +2024,7 @@
 		do {
 			// Make sure the tile is not in the list of banned tiles and that a rail can be built here.
 			if (!AiIsTileBanned(arf->player, tile, p[0]) &&
-					!CmdFailed(DoCommandByTile(tile, arf->player->ai.railtype_to_use, p[0], DC_AUTO | DC_NO_WATER | DC_NO_RAIL_OVERLAP, CMD_BUILD_SINGLE_RAIL))) {
+					!CmdFailed(DoCommand(tile, arf->player->ai.railtype_to_use, p[0], DC_AUTO | DC_NO_WATER | DC_NO_RAIL_OVERLAP, CMD_BUILD_SINGLE_RAIL))) {
 				AiBuildRailRecursive(arf, tile, p[1]);
 			}
 
@@ -2111,26 +2111,26 @@
 		*/
 		for (i = MAX_BRIDGES - 1; i != 0; i--) {
 			if (CheckBridge_Stuff(i, bridge_len)) {
-				int32 cost = DoCommandByTile(arf.bridge_end_tile, p->ai.cur_tile_a, i | (p->ai.railtype_to_use << 8), DC_AUTO, CMD_BUILD_BRIDGE);
+				int32 cost = DoCommand(arf.bridge_end_tile, p->ai.cur_tile_a, i | (p->ai.railtype_to_use << 8), DC_AUTO, CMD_BUILD_BRIDGE);
 				if (!CmdFailed(cost) && cost < (p->player_money >> 5))
 					break;
 			}
 		}
 
 		// Build it
-		DoCommandByTile(arf.bridge_end_tile, p->ai.cur_tile_a, i | (p->ai.railtype_to_use << 8), DC_AUTO | DC_EXEC, CMD_BUILD_BRIDGE);
+		DoCommand(arf.bridge_end_tile, p->ai.cur_tile_a, i | (p->ai.railtype_to_use << 8), DC_AUTO | DC_EXEC, CMD_BUILD_BRIDGE);
 
 		p->ai.cur_tile_a = arf.bridge_end_tile;
 		p->ai.state_counter = 0;
 	} else if (arf.best_ptr[0]&0x40) {
 		// tunnel
-		DoCommandByTile(p->ai.cur_tile_a, p->ai.railtype_to_use, 0, DC_AUTO | DC_EXEC, CMD_BUILD_TUNNEL);
+		DoCommand(p->ai.cur_tile_a, p->ai.railtype_to_use, 0, DC_AUTO | DC_EXEC, CMD_BUILD_TUNNEL);
 		p->ai.cur_tile_a = _build_tunnel_endtile;
 		p->ai.state_counter = 0;
 	} else {
 		// rail
 		p->ai.cur_dir_a = arf.best_ptr[1];
-		DoCommandByTile(p->ai.cur_tile_a, p->ai.railtype_to_use, arf.best_ptr[0],
+		DoCommand(p->ai.cur_tile_a, p->ai.railtype_to_use, arf.best_ptr[0],
 			DC_EXEC | DC_AUTO | DC_NO_WATER | DC_NO_RAIL_OVERLAP, CMD_BUILD_SINGLE_RAIL);
 		p->ai.state_counter = 0;
 	}
@@ -2153,7 +2153,7 @@
 	if (IsTileType(tile, MP_TUNNELBRIDGE)) {
 		if (IsTunnel(tile)) {
 			// Clear the tunnel and continue at the other side of it.
-			if (CmdFailed(DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR)))
+			if (CmdFailed(DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR)))
 				return false;
 			p->ai.cur_tile_a = TILE_MASK(_build_tunnel_endtile - TileOffsByDir(p->ai.cur_dir_a));
 			return true;
@@ -2168,7 +2168,7 @@
 
 			tilenew = TILE_MASK(tile - TileOffsByDir(p->ai.cur_dir_a));
 			// And clear the bridge.
-			if (CmdFailed(DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR)))
+			if (CmdFailed(DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR)))
 				return false;
 			p->ai.cur_tile_a = tilenew;
 			return true;
@@ -2185,11 +2185,11 @@
 	// Then remove and signals if there are any.
 	if (IsTileType(tile, MP_RAILWAY) &&
 			GetRailTileType(tile) == RAIL_TYPE_SIGNALS) {
-		DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_REMOVE_SIGNALS);
+		DoCommand(tile, 0, 0, DC_EXEC, CMD_REMOVE_SIGNALS);
 	}
 
 	// And also remove the rail.
-	if (CmdFailed(DoCommandByTile(tile, 0, bit, DC_EXEC, CMD_REMOVE_SINGLE_RAIL)))
+	if (CmdFailed(DoCommand(tile, 0, bit, DC_EXEC, CMD_REMOVE_SINGLE_RAIL)))
 		return false;
 
 	// Find the direction at the other edge of the rail.
@@ -2294,7 +2294,7 @@
 	p->ai.cur_tile_a = tile;
 	p->ai.start_dir_a = dir;
 	p->ai.cur_dir_a = dir;
-	DoCommandByTile(TILE_MASK(tile + TileOffsByDir(dir)), 0, (dir&1)?1:0, DC_EXEC, CMD_REMOVE_SINGLE_RAIL);
+	DoCommand(TILE_MASK(tile + TileOffsByDir(dir)), 0, (dir&1)?1:0, DC_EXEC, CMD_REMOVE_SINGLE_RAIL);
 
 	assert(TILE_MASK(tile) != 0xFF00);
 
@@ -2305,7 +2305,7 @@
 	p->ai.cur_tile_b = tile;
 	p->ai.start_dir_b = dir;
 	p->ai.cur_dir_b = dir;
-	DoCommandByTile(TILE_MASK(tile + TileOffsByDir(dir)), 0, (dir&1)?1:0, DC_EXEC, CMD_REMOVE_SINGLE_RAIL);
+	DoCommand(TILE_MASK(tile + TileOffsByDir(dir)), 0, (dir&1)?1:0, DC_EXEC, CMD_REMOVE_SINGLE_RAIL);
 
 	assert(TILE_MASK(tile) != 0xFF00);
 
@@ -2381,7 +2381,7 @@
 			/* veh will return INVALID_ENGINE if no suitable wagon is available.
 			 * We shall treat this in the same way as having no money */
 			if (veh == INVALID_ENGINE) goto handle_nocash;
-			cost = DoCommandByTile(tile, veh, 0, DC_EXEC, CMD_BUILD_RAIL_VEHICLE);
+			cost = DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_RAIL_VEHICLE);
 			if (CmdFailed(cost)) goto handle_nocash;
 			p->ai.wagon_list[i] = _new_wagon_id;
 			p->ai.wagon_list[i + 1] = INVALID_VEHICLE;
@@ -2400,7 +2400,7 @@
 		// after a while, if AI still doesn't have cash, get out of this block by selling the wagons.
 		if (++p->ai.state_counter == 1000) {
 			for (i = 0; p->ai.wagon_list[i] != INVALID_VEHICLE; i++) {
-				cost = DoCommandByTile(tile, p->ai.wagon_list[i], 0, DC_EXEC, CMD_SELL_RAIL_WAGON);
+				cost = DoCommand(tile, p->ai.wagon_list[i], 0, DC_EXEC, CMD_SELL_RAIL_WAGON);
 				assert(!CmdFailed(cost));
 			}
 			p->ai.state =	AIS_0;
@@ -2409,7 +2409,7 @@
 	}
 
 	// Try to build the locomotive
-	cost = DoCommandByTile(tile, veh, 0, DC_EXEC, CMD_BUILD_RAIL_VEHICLE);
+	cost = DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_RAIL_VEHICLE);
 	assert(!CmdFailed(cost));
 	loco_id = _new_train_id;
 
@@ -2418,12 +2418,12 @@
 	if (v->next != NULL) {
 		i = p->ai.wagon_list[p->ai.num_wagons * 2 - 2];
 		p->ai.wagon_list[p->ai.num_wagons * 2 - 2] = INVALID_VEHICLE;
-		DoCommandByTile(tile, i, 0, DC_EXEC, CMD_SELL_RAIL_WAGON);
+		DoCommand(tile, i, 0, DC_EXEC, CMD_SELL_RAIL_WAGON);
 	}
 
 	// Move the wagons onto the train
 	for (i = 0; p->ai.wagon_list[i] != INVALID_VEHICLE; i++) {
-		DoCommandByTile(tile, p->ai.wagon_list[i] | (loco_id << 16), 0, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
+		DoCommand(tile, p->ai.wagon_list[i] | (loco_id << 16), 0, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
 	}
 
 	for (i = 0; p->ai.order_list_blocks[i] != 0xFF; i++) {
@@ -2443,12 +2443,12 @@
 		if (p->ai.num_want_fullload != 0 && (is_pass || i == 0))
 			order.flags |= OF_FULL_LOAD;
 
-		DoCommandByTile(0, loco_id + (i << 16),	PackOrder(&order), DC_EXEC, CMD_INSERT_ORDER);
+		DoCommand(0, loco_id + (i << 16),	PackOrder(&order), DC_EXEC, CMD_INSERT_ORDER);
 	}
 
-	DoCommandByTile(0, loco_id, 0, DC_EXEC, CMD_START_STOP_TRAIN);
-
-	DoCommandByTile(0, loco_id, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
+	DoCommand(0, loco_id, 0, DC_EXEC, CMD_START_STOP_TRAIN);
+
+	DoCommand(0, loco_id, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
 
 	if (p->ai.num_want_fullload != 0) p->ai.num_want_fullload--;
 
@@ -2472,7 +2472,7 @@
 		if (aib->cur_building_rule != 255) {
 			b = _default_rail_track_data[aib->cur_building_rule]->data;
 			while (b->mode != 4) {
-				DoCommandByTile(TILE_ADD(aib->use_tile, ToTileIndexDiff(b->tileoffs)), 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+				DoCommand(TILE_ADD(aib->use_tile, ToTileIndexDiff(b->tileoffs)), 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 				b++;
 			}
 		}
@@ -2554,7 +2554,7 @@
 				if ((GetRoadBits(c) & p->attr) == p->attr) continue;
 			}
 
-			ret = DoCommandByTile(c, p->attr, 0, flag | DC_AUTO | DC_NO_WATER, CMD_BUILD_ROAD);
+			ret = DoCommand(c, p->attr, 0, flag | DC_AUTO | DC_NO_WATER, CMD_BUILD_ROAD);
 			if (CmdFailed(ret)) return CMD_ERROR;
 			total_cost += ret;
 
@@ -2563,15 +2563,15 @@
 
 		if (p->mode == 0) {
 			// Depot
-			ret = DoCommandByTile(c, p->attr, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_ROAD_DEPOT);
+			ret = DoCommand(c, p->attr, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_ROAD_DEPOT);
 			goto clear_town_stuff;
 		} else if (p->mode == 1) {
 			if (_want_road_truck_station) {
 				// Truck station
-				ret = DoCommandByTile(c, p->attr, RS_TRUCK, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_ROAD_STOP);
+				ret = DoCommand(c, p->attr, RS_TRUCK, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_ROAD_STOP);
 			} else {
 				// Bus station
-				ret = DoCommandByTile(c, p->attr, RS_BUS, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_ROAD_STOP);
+				ret = DoCommand(c, p->attr, RS_BUS, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_ROAD_STOP);
 			}
 clear_town_stuff:;
 
@@ -2589,7 +2589,7 @@
 			if (GetTileSlope(c, NULL) != 0) return CMD_ERROR;
 
 			if (!IsTileType(c, MP_STREET) || GetRoadType(c) != ROAD_NORMAL) {
-				ret = DoCommandByTile(c, 0, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_LANDSCAPE_CLEAR);
+				ret = DoCommand(c, 0, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_LANDSCAPE_CLEAR);
 				if (CmdFailed(ret)) return CMD_ERROR;
 			}
 
@@ -2822,7 +2822,7 @@
 		1+2,
 		8+4,
 	};
-	return !CmdFailed(DoCommandByTile(tile, _road_bits[type], 0, flags, CMD_BUILD_ROAD));
+	return !CmdFailed(DoCommand(tile, _road_bits[type], 0, flags, CMD_BUILD_ROAD));
 }
 
 static inline void AiCheckBuildRoadBridgeHere(AiRoadFinder *arf, TileIndex tile, const byte *p)
@@ -2857,7 +2857,7 @@
 		}
 
 		// Is building a (rail)bridge possible at this place (type doesn't matter)?
-		if (CmdFailed(DoCommandByTile(tile_new, tile, 0x8000, DC_AUTO, CMD_BUILD_BRIDGE)))
+		if (CmdFailed(DoCommand(tile_new, tile, 0x8000, DC_AUTO, CMD_BUILD_BRIDGE)))
 			return;
 		AiBuildRoadRecursive(arf, tile_new, dir2);
 
@@ -2873,7 +2873,7 @@
 	uint z;
 
 	if (GetTileSlope(tile, &z) == _dir_table_2[p[0] & 3] && z != 0) {
-		int32 cost = DoCommandByTile(tile, 0x200, 0, DC_AUTO, CMD_BUILD_TUNNEL);
+		int32 cost = DoCommand(tile, 0x200, 0, DC_AUTO, CMD_BUILD_TUNNEL);
 
 		if (!CmdFailed(cost) && cost <= (arf->player->player_money>>4)) {
 			AiBuildRoadRecursive(arf, _build_tunnel_endtile, p[0]&3);
@@ -3009,18 +3009,18 @@
 		*/
 		for (i = 10; i != 0; i--) {
 			if (CheckBridge_Stuff(i, bridge_len)) {
-				int32 cost = DoCommandByTile(tile, p->ai.cur_tile_a, i + (0x80 << 8), DC_AUTO, CMD_BUILD_BRIDGE);
+				int32 cost = DoCommand(tile, p->ai.cur_tile_a, i + (0x80 << 8), DC_AUTO, CMD_BUILD_BRIDGE);
 				if (!CmdFailed(cost) && cost < (p->player_money >> 5)) break;
 			}
 		}
 
 		// Build it
-		DoCommandByTile(tile, p->ai.cur_tile_a, i + (0x80 << 8), DC_AUTO | DC_EXEC, CMD_BUILD_BRIDGE);
+		DoCommand(tile, p->ai.cur_tile_a, i + (0x80 << 8), DC_AUTO | DC_EXEC, CMD_BUILD_BRIDGE);
 
 		p->ai.state_counter = 0;
 	} else if (arf.best_ptr[0]&0x40) {
 		// tunnel
-		DoCommandByTile(tile, 0x200, 0, DC_AUTO | DC_EXEC, CMD_BUILD_TUNNEL);
+		DoCommand(tile, 0x200, 0, DC_AUTO | DC_EXEC, CMD_BUILD_TUNNEL);
 		p->ai.cur_tile_a = _build_tunnel_endtile;
 		p->ai.state_counter = 0;
 	} else {
@@ -3162,7 +3162,7 @@
 		return;
 	}
 
-	if (CmdFailed(DoCommandByTile(tile, veh, 0, DC_EXEC, CMD_BUILD_ROAD_VEH))) return;
+	if (CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_ROAD_VEH))) return;
 
 	loco_id = _new_roadveh_id;
 
@@ -3183,11 +3183,11 @@
 		if (p->ai.num_want_fullload != 0 && (is_pass || i == 0))
 			order.flags |= OF_FULL_LOAD;
 
-		DoCommandByTile(0, loco_id + (i << 16),	PackOrder(&order), DC_EXEC, CMD_INSERT_ORDER);
+		DoCommand(0, loco_id + (i << 16),	PackOrder(&order), DC_EXEC, CMD_INSERT_ORDER);
 	}
 
-	DoCommandByTile(0, loco_id, 0, DC_EXEC, CMD_START_STOP_ROADVEH);
-	DoCommandByTile(0, loco_id, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
+	DoCommand(0, loco_id, 0, DC_EXEC, CMD_START_STOP_ROADVEH);
+	DoCommand(0, loco_id, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
 
 	if (p->ai.num_want_fullload != 0) p->ai.num_want_fullload--;
 	if (--p->ai.num_loco_to_build == 0) p->ai.state = AIS_0;
@@ -3206,7 +3206,7 @@
 			b = _road_default_block_data[aib->cur_building_rule]->data;
 			while (b->mode != 4) {
 				if (b->mode <= 1) {
-					DoCommandByTile(TILE_ADD(aib->use_tile, ToTileIndexDiff(b->tileoffs)), 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+					DoCommand(TILE_ADD(aib->use_tile, ToTileIndexDiff(b->tileoffs)), 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 				}
 				b++;
 			}
@@ -3306,7 +3306,7 @@
 
 	for (; p->mode == 0; p++) {
 		if (!HASBIT(_avail_aircraft, p->attr)) return CMD_ERROR;
-		ret = DoCommandByTile(TILE_MASK(tile + ToTileIndexDiff(p->tileoffs)), p->attr,0,flag | DC_AUTO | DC_NO_WATER,CMD_BUILD_AIRPORT);
+		ret = DoCommand(TILE_MASK(tile + ToTileIndexDiff(p->tileoffs)), p->attr,0,flag | DC_AUTO | DC_NO_WATER,CMD_BUILD_AIRPORT);
 		if (CmdFailed(ret)) return CMD_ERROR;
 		total_cost += ret;
 	}
@@ -3464,7 +3464,7 @@
 	/* XXX - Have the AI pick the hangar terminal in an airport. Eg get airport-type
 	 * and offset to the FIRST depot because the AI picks the st->xy tile */
 	tile += ToTileIndexDiff(GetAirport(GetStationByTile(tile)->airport_type)->airport_depots[0]);
-	if (CmdFailed(DoCommandByTile(tile, veh, 0, DC_EXEC, CMD_BUILD_AIRCRAFT))) return;
+	if (CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_AIRCRAFT))) return;
 	loco_id = _new_aircraft_id;
 
 	for (i=0; p->ai.order_list_blocks[i] != 0xFF; i++) {
@@ -3480,12 +3480,12 @@
 		if (p->ai.num_want_fullload != 0 && (is_pass || i == 0))
 			order.flags |= OF_FULL_LOAD;
 
-		DoCommandByTile(0, loco_id + (i << 16), PackOrder(&order), DC_EXEC, CMD_INSERT_ORDER);
+		DoCommand(0, loco_id + (i << 16), PackOrder(&order), DC_EXEC, CMD_INSERT_ORDER);
 	}
 
-	DoCommandByTile(0, loco_id, 0, DC_EXEC, CMD_START_STOP_AIRCRAFT);
-
-	DoCommandByTile(0, loco_id, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
+	DoCommand(0, loco_id, 0, DC_EXEC, CMD_START_STOP_AIRCRAFT);
+
+	DoCommand(0, loco_id, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
 
 	if (p->ai.num_want_fullload != 0) p->ai.num_want_fullload--;
 
@@ -3519,29 +3519,29 @@
 
 			if (!IsTileDepotType(v->tile, TRANSPORT_RAIL) || v->u.rail.track != 0x80 || !(v->vehstatus&VS_STOPPED)) {
 				if (v->current_order.type != OT_GOTO_DEPOT)
-					DoCommandByTile(0, v->index, 0, DC_EXEC, CMD_TRAIN_GOTO_DEPOT);
+					DoCommand(0, v->index, 0, DC_EXEC, CMD_TRAIN_GOTO_DEPOT);
 				goto going_to_depot;
 			}
 
 			// Sell whole train
-			DoCommandByTile(v->tile, v->index, 1, DC_EXEC, CMD_SELL_RAIL_WAGON);
+			DoCommand(v->tile, v->index, 1, DC_EXEC, CMD_SELL_RAIL_WAGON);
 
 		} else if (v->type == VEH_Road) {
 			if (!IsTileDepotType(v->tile, TRANSPORT_ROAD) || v->u.road.state != 254 || !(v->vehstatus&VS_STOPPED)) {
 				if (v->current_order.type != OT_GOTO_DEPOT)
-					DoCommandByTile(0, v->index, 0, DC_EXEC, CMD_SEND_ROADVEH_TO_DEPOT);
+					DoCommand(0, v->index, 0, DC_EXEC, CMD_SEND_ROADVEH_TO_DEPOT);
 				goto going_to_depot;
 			}
 
-			DoCommandByTile(0, v->index, 0, DC_EXEC, CMD_SELL_ROAD_VEH);
+			DoCommand(0, v->index, 0, DC_EXEC, CMD_SELL_ROAD_VEH);
 		} else if (v->type == VEH_Aircraft) {
 			if (!IsHangarTile(v->tile) || !(v->vehstatus & VS_STOPPED)) {
 				if (v->current_order.type != OT_GOTO_DEPOT)
-					DoCommandByTile(0, v->index, 0, DC_EXEC, CMD_SEND_AIRCRAFT_TO_HANGAR);
+					DoCommand(0, v->index, 0, DC_EXEC, CMD_SEND_AIRCRAFT_TO_HANGAR);
 				goto going_to_depot;
 			}
 
-			DoCommandByTile(0, v->index, 0, DC_EXEC, CMD_SELL_AIRCRAFT);
+			DoCommand(0, v->index, 0, DC_EXEC, CMD_SELL_AIRCRAFT);
 			} else if (v->type == VEH_Ship) {
 			// XXX: not implemented
 			error("!v->type == VEH_Ship");
@@ -3589,7 +3589,7 @@
 					(tile = st->train_tile) != 0 ||
 					(tile = st->dock_tile) != 0 ||
 					(tile = st->airport_tile) != 0)) {
-			DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+			DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 		}
 		used++;
 	}
@@ -3657,7 +3657,7 @@
 			if (GetRailTrackStatus(tile + TileOffsByDir(dir)) & _depot_bits[dir])
 				return;
 
-			DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+			DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 		}
 	} else if (IsTileType(tile, MP_STREET)) {
 		if (!IsTileOwner(tile, _current_player)) return;
@@ -3690,8 +3690,8 @@
 
 			dir = GetRoadDepotDirection(tile);
 
-			DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
-			DoCommandByTile(
+			DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+			DoCommand(
 				TILE_MASK(tile + TileOffsByDir(dir)),
 				DiagDirToRoadBits(ReverseDiagDir(dir)),
 				0,
@@ -3833,7 +3833,7 @@
 			// Computer wants to buy it.
 			old_p = _current_player;
 			_current_player = p->index;
-			DoCommandByTile(0, old_p, 0, DC_EXEC, CMD_BUY_COMPANY);
+			DoCommand(0, old_p, 0, DC_EXEC, CMD_BUY_COMPANY);
 			_current_player = old_p;
 		}
 	}
@@ -3846,14 +3846,14 @@
 	if (p->player_money > base * 1400) {
 		// Decrease loan
 		if (p->current_loan != 0) {
-			DoCommandByTile(0, 0, 0, DC_EXEC, CMD_DECREASE_LOAN);
+			DoCommand(0, 0, 0, DC_EXEC, CMD_DECREASE_LOAN);
 		}
 	} else if (p->player_money < base * 500) {
 		// Increase loan
 		if (p->current_loan < _economy.max_loan &&
 				p->num_valid_stat_ent >= 2 &&
 				-(p->old_economy[0].expenses+p->old_economy[1].expenses) < base * 60) {
-			DoCommandByTile(0, 0, 0, DC_EXEC, CMD_INCREASE_LOAN);
+			DoCommand(0, 0, 0, DC_EXEC, CMD_INCREASE_LOAN);
 		}
 	}
 }
@@ -3865,7 +3865,7 @@
 	if (p->location_of_house == 0 &&
 			p->last_build_coordinate != 0) {
 		tile = AdjustTileCoordRandomly(p->last_build_coordinate, 8);
-		DoCommandByTile(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_BUILD_COMPANY_HQ);
+		DoCommand(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_BUILD_COMPANY_HQ);
 	}
 }
 
diff -r d53bc3e794bd -r 35d747bb5e82 aircraft_cmd.c
--- a/aircraft_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/aircraft_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -130,16 +130,15 @@
 
 
 /** Build an aircraft.
- * @param x,y tile coordinates of depot where aircraft is built
+ * @param tile tile of depot where aircraft is built
  * @param p1 aircraft type being built (engine)
  * @param p2 unused
  */
-int32 CmdBuildAircraft(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildAircraft(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int32 value;
 	Vehicle *vl[3], *v, *u, *w;
 	UnitID unit_num;
-	TileIndex tile = TileVirtXY(x, y);
 	const AircraftVehicleInfo *avi;
 	Engine *e;
 
@@ -166,6 +165,9 @@
 		return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);
 
 	if (flags & DC_EXEC) {
+		uint x;
+		uint y;
+
 		v = vl[0];
 		u = vl[1];
 
@@ -322,11 +324,11 @@
 }
 
 /** Sell an aircraft.
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID to be sold
  * @param p2 unused
  */
-int32 CmdSellAircraft(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSellAircraft(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
@@ -351,11 +353,11 @@
 }
 
 /** Start/Stop an aircraft.
- * @param x,y unused
+ * @param tile unused
  * @param p1 aircraft ID to start/stop
  * @param p2 unused
  */
-int32 CmdStartStopAircraft(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdStartStopAircraft(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
@@ -384,14 +386,14 @@
 }
 
 /** Send an aircraft to the hangar.
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID to send to the hangar
  * @param p2 various bitmasked elements
  * - p2 = 0      - aircraft goes to the depot and stays there (user command)
  * - p2 non-zero - aircraft will try to goto a depot, but not stop there (eg forced servicing)
  * - p2 (bit 17) - aircraft will try to goto a depot at the next airport
  */
-int32 CmdSendAircraftToHangar(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSendAircraftToHangar(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
@@ -447,12 +449,12 @@
 
 
 /** Refits an aircraft to the specified cargo type.
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID of the aircraft to refit
  * @param p2 various bitstuffed elements
  * - p2 = (bit 0-7) - the new cargo type to refit to
  */
-int32 CmdRefitAircraft(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRefitAircraft(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 	int pass, mail;
diff -r d53bc3e794bd -r 35d747bb5e82 aircraft_gui.c
--- a/aircraft_gui.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/aircraft_gui.c	Mon Apr 10 07:15:58 2006 +0000
@@ -244,7 +244,7 @@
 		WP(w,refit_d).cargo = DrawVehicleRefitWindow(v, WP(w, refit_d).sel);
 
 		if (WP(w,refit_d).cargo != CT_INVALID) {
-			int32 cost = DoCommandByTile(v->tile, v->index, WP(w,refit_d).cargo, DC_QUERY_COST, CMD_REFIT_AIRCRAFT);
+			int32 cost = DoCommand(v->tile, v->index, WP(w,refit_d).cargo, DC_QUERY_COST, CMD_REFIT_AIRCRAFT);
 			if (!CmdFailed(cost)) {
 				SetDParam(2, cost);
 				SetDParam(0, _cargoc.names_long[WP(w,refit_d).cargo]);
diff -r d53bc3e794bd -r 35d747bb5e82 bridge_gui.c
--- a/bridge_gui.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/bridge_gui.c	Mon Apr 10 07:15:58 2006 +0000
@@ -128,7 +128,7 @@
 
 	// only query bridge building possibility once, result is the same for all bridges!
 	// returns CMD_ERROR on failure, and price on success
-	ret = DoCommandByTile(end, start, (bridge_type << 8), DC_AUTO | DC_QUERY_COST, CMD_BUILD_BRIDGE);
+	ret = DoCommand(end, start, (bridge_type << 8), DC_AUTO | DC_QUERY_COST, CMD_BUILD_BRIDGE);
 
 	if (CmdFailed(ret)) {
 		errmsg = _error_message;
diff -r d53bc3e794bd -r 35d747bb5e82 clear_cmd.c
--- a/clear_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/clear_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -96,7 +96,7 @@
 		return r;
 
 	if (!IsTileType(tile, MP_RAILWAY)) {
-		int32 ret = DoCommandByTile(tile, 0,0, ts->flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);
+		int32 ret = DoCommand(tile, 0,0, ts->flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);
 
 		if (CmdFailed(ret)) {
 			_terraform_err_tile = tile;
@@ -183,14 +183,13 @@
 }
 
 /** Terraform land
- * @param x,y coordinates to terraform
+ * @param tile tile to terraform
  * @param p1 corners to terraform.
  * @param p2 direction; eg up or down
  */
-int32 CmdTerraformLand(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdTerraformLand(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	TerraformerState ts;
-	TileIndex tile;
 	int direction;
 
 	TerraformerHeightMod modheight_data[576];
@@ -208,8 +207,6 @@
 	ts.modheight = modheight_data;
 	ts.tile_table = tile_table_data;
 
-	tile = TileVirtXY(x, y);
-
 	/* Make an extra check for map-bounds cause we add tiles to the originating tile */
 	if (tile + TileDiffXY(1, 1) >= MapSize()) return CMD_ERROR;
 
@@ -275,7 +272,7 @@
 			int count;
 			TileIndex *ti = ts.tile_table;
 			for (count = ts.tile_table_count; count != 0; count--, ti++) {
-				DoCommandByTile(*ti, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+				DoCommand(*ti, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 			}
 		}
 
@@ -307,16 +304,17 @@
 
 
 /** Levels a selected (rectangle) area of land
- * @param x,y end tile of area-drag
+ * @param tile end tile of area-drag
  * @param p1 start tile of area drag
  * @param p2 unused
  */
-int32 CmdLevelLand(int ex, int ey, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdLevelLand(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int size_x, size_y;
+	int ex;
+	int ey;
 	int sx, sy;
 	uint h, curh;
-	TileIndex tile;
 	int32 ret, cost, money;
 
 	if (p1 >= MapSize()) return CMD_ERROR;
@@ -326,9 +324,9 @@
 	// remember level height
 	h = TileHeight(p1);
 
-	ex >>= 4; ey >>= 4;
-
 	// make sure sx,sy are smaller than ex,ey
+	ex = TileX(tile);
+	ey = TileY(tile);
 	sx = TileX(p1);
 	sy = TileY(p1);
 	if (ex < sx) intswap(ex, sx);
@@ -344,7 +342,7 @@
 	BEGIN_TILE_LOOP(tile2, size_x, size_y, tile) {
 		curh = TileHeight(tile2);
 		while (curh != h) {
-			ret = DoCommandByTile(tile2, 8, (curh > h) ? 0 : 1, flags & ~DC_EXEC, CMD_TERRAFORM_LAND);
+			ret = DoCommand(tile2, 8, (curh > h) ? 0 : 1, flags & ~DC_EXEC, CMD_TERRAFORM_LAND);
 			if (CmdFailed(ret)) break;
 			cost += ret;
 
@@ -353,7 +351,7 @@
 					_additional_cash_required = ret;
 					return cost - ret;
 				}
-				DoCommandByTile(tile2, 8, (curh > h) ? 0 : 1, flags, CMD_TERRAFORM_LAND);
+				DoCommand(tile2, 8, (curh > h) ? 0 : 1, flags, CMD_TERRAFORM_LAND);
 			}
 
 			curh += (curh > h) ? -1 : 1;
@@ -365,26 +363,23 @@
 
 /** Purchase a land area. Actually you only purchase one tile, so
  * the name is a bit confusing ;p
- * @param x,y the tile the player is purchasing
+ * @param tile the tile the player is purchasing
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdPurchaseLandArea(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdPurchaseLandArea(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile;
 	int32 cost;
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
 
-	tile = TileVirtXY(x, y);
-
 	if (!EnsureNoVehicle(tile)) return CMD_ERROR;
 
 	if (IsOwnedLandTile(tile) && IsTileOwner(tile, _current_player)) {
 		return_cmd_error(STR_5807_YOU_ALREADY_OWN_IT);
 	}
 
-	cost = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(cost)) return CMD_ERROR;
 
 	if (flags & DC_EXEC) {
@@ -422,18 +417,14 @@
 
 /** Sell a land area. Actually you only sell one tile, so
  * the name is a bit confusing ;p
- * @param x,y the tile the player is selling
+ * @param tile the tile the player is selling
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdSellLandArea(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSellLandArea(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile;
-
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
 
-	tile = TileVirtXY(x, y);
-
 	if (!IsOwnedLandTile(tile)) return CMD_ERROR;
 	if (!CheckTileOwnership(tile) && _current_player != OWNER_WATER) return CMD_ERROR;
 
diff -r d53bc3e794bd -r 35d747bb5e82 command.c
--- a/command.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/command.c	Mon Apr 10 07:15:58 2006 +0000
@@ -13,7 +13,7 @@
 
 const char* _cmd_text = NULL;
 
-#define DEF_COMMAND(yyyy) int32 yyyy(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+#define DEF_COMMAND(yyyy) int32 yyyy(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 
 DEF_COMMAND(CmdBuildRailroadTrack);
 DEF_COMMAND(CmdRemoveRailroadTrack);
@@ -315,21 +315,16 @@
 
 byte GetCommandFlags(uint cmd) {return _command_proc_table[cmd & 0xFF].flags;}
 
-int32 DoCommandByTile(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc)
-{
-	return DoCommand(TileX(tile) * TILE_SIZE, TileY(tile) * TILE_SIZE, p1, p2, flags, procc);
-}
-
 
 static int _docommand_recursive;
 
-int32 DoCommand(int x, int y, uint32 p1, uint32 p2, uint32 flags, uint procc)
+int32 DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc)
 {
 	int32 res;
 	CommandProc *proc;
 
 	/* Do not even think about executing out-of-bounds tile-commands */
-	if (TileVirtXY(x, y) >= MapSize()) {
+	if (tile >= MapSize()) {
 		_cmd_text = NULL;
 		return CMD_ERROR;
 	}
@@ -342,7 +337,7 @@
 
 	// only execute the test call if it's toplevel, or we're not execing.
 	if (_docommand_recursive == 1 || !(flags & DC_EXEC) || (flags & DC_FORCETEST) ) {
-		res = proc(x, y, flags&~DC_EXEC, p1, p2);
+		res = proc(tile, flags & ~DC_EXEC, p1, p2);
 		if (CmdFailed(res)) {
 			if (res & 0xFFFF) _error_message = res & 0xFFFF;
 			goto error;
@@ -362,7 +357,7 @@
 
 	/* Execute the command here. All cost-relevant functions set the expenses type
 	 * themselves with "SET_EXPENSES_TYPE(...);" at the beginning of the function */
-	res = proc(x, y, flags, p1, p2);
+	res = proc(tile, flags, p1, p2);
 	if (CmdFailed(res)) {
 		if (res & 0xFFFF) _error_message = res & 0xFFFF;
 error:
@@ -375,8 +370,8 @@
 	if (--_docommand_recursive == 0) {
 		SubtractMoneyFromPlayer(res);
 		// XXX - Old AI hack which doesn't use DoCommandDP; update last build coord of player
-		if ( (x|y) != 0 && _current_player < MAX_PLAYERS) {
-			GetPlayer(_current_player)->last_build_coordinate = TileVirtXY(x, y);
+		if (tile != 0 && _current_player < MAX_PLAYERS) {
+			GetPlayer(_current_player)->last_build_coordinate = tile;
 		}
 	}
 
@@ -457,7 +452,7 @@
 	// cost estimation only?
 	if (_shift_pressed && IsLocalPlayer() && !(cmd & (CMD_NETWORK_COMMAND | CMD_SHOW_NO_ERROR))) {
 		// estimate the cost.
-		res = proc(x, y, flags, p1, p2);
+		res = proc(tile, flags, p1, p2);
 		if (CmdFailed(res)) {
 			if (res & 0xFFFF) _error_message = res & 0xFFFF;
 			ShowErrorMessage(_error_message, error_part1, x, y);
@@ -473,7 +468,7 @@
 
 	if (!((cmd & CMD_NO_TEST_IF_IN_NETWORK) && _networking)) {
 		// first test if the command can be executed.
-		res = proc(x,y, flags, p1, p2);
+		res = proc(tile, flags, p1, p2);
 		if (CmdFailed(res)) {
 			if (res & 0xFFFF) _error_message = res & 0xFFFF;
 			goto show_error;
@@ -505,7 +500,7 @@
 	/* Actually try and execute the command. If no cost-type is given
 	 * use the construction one */
 	_yearly_expenses_type = EXPENSES_CONSTRUCTION;
-	res2 = proc(x,y, flags|DC_EXEC, p1, p2);
+	res2 = proc(tile, flags|DC_EXEC, p1, p2);
 
 	// If notest is on, it means the result of the test can be different than
 	//   the real command.. so ignore the test
diff -r d53bc3e794bd -r 35d747bb5e82 command.h
--- a/command.h	Sun Apr 09 18:35:24 2006 +0000
+++ b/command.h	Mon Apr 10 07:15:58 2006 +0000
@@ -169,6 +169,8 @@
 	CMD_OFFLINE = 0x2, /// the command cannot be executed in a multiplayer game; single-player only
 };
 
+typedef int32 CommandProc(TileIndex tile, uint32 flags, uint32 p1, uint32 p2);
+
 typedef struct Command {
 	CommandProc *proc;
 	byte flags;
@@ -189,8 +191,7 @@
 }
 
 /* command.c */
-int32 DoCommand(int x, int y, uint32 p1, uint32 p2, uint32 flags, uint procc);
-int32 DoCommandByTile(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc);
+int32 DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc);
 
 extern const char* _cmd_text; // Text, which gets sent with a command
 
diff -r d53bc3e794bd -r 35d747bb5e82 disaster_cmd.c
--- a/disaster_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/disaster_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -33,7 +33,7 @@
 		case MP_HOUSE: {
 			PlayerID p = _current_player;
 			_current_player = OWNER_NONE;
-			DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+			DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 			_current_player = p;
 			break;
 		}
diff -r d53bc3e794bd -r 35d747bb5e82 economy.c
--- a/economy.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/economy.c	Mon Apr 10 07:15:58 2006 +0000
@@ -1531,11 +1531,11 @@
 extern int GetAmountOwnedBy(Player *p, byte owner);
 
 /** Acquire shares in an opposing company.
- * @param x,y unused
+ * @param tile unused
  * @param p1 player to buy the shares from
  * @param p2 unused
  */
-int32 CmdBuyShareInCompany(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuyShareInCompany(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Player *p;
 	int64 cost;
@@ -1576,11 +1576,11 @@
 }
 
 /** Sell shares in an opposing company.
- * @param x,y unused
+ * @param tile unused
  * @param p1 player to sell the shares from
  * @param p2 unused
  */
-int32 CmdSellShareInCompany(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSellShareInCompany(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Player *p;
 	int64 cost;
@@ -1611,11 +1611,11 @@
  * When a competing company is gone bankrupt you get the chance to purchase
  * that company.
  * @todo currently this only works for AI players
- * @param x,y unused
+ * @param tile unused
  * @param p1 player/company to buy up
  * @param p2 unused
  */
-int32 CmdBuyCompany(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuyCompany(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Player *p;
 
diff -r d53bc3e794bd -r 35d747bb5e82 engine.c
--- a/engine.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/engine.c	Mon Apr 10 07:15:58 2006 +0000
@@ -334,11 +334,11 @@
 
 /** Accept an engine prototype. XXX - it is possible that the top-player
  * changes while you are waiting to accept the offer? Then it becomes invalid
- * @param x,y unused
+ * @param tile unused
  * @param p1 engine-prototype offered
  * @param p2 unused
  */
-int32 CmdWantEnginePreview(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdWantEnginePreview(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Engine *e;
 
@@ -445,11 +445,11 @@
 }
 
 /** Rename an engine.
- * @param x,y unused
+ * @param tile unused
  * @param p1 engine ID to rename
  * @param p2 unused
  */
-int32 CmdRenameEngine(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRenameEngine(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	StringID str;
 
diff -r d53bc3e794bd -r 35d747bb5e82 industry_cmd.c
--- a/industry_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/industry_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -1030,7 +1030,7 @@
 					_industry_sound_tile = tile;
 					SndPlayTileFx(SND_38_CHAINSAW, tile);
 
-					DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+					DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 					SetTropicZone(tile, TROPICZONE_INVALID);
 
 					i->cargo_waiting[0] = min(0xffff, i->cargo_waiting[0] + 45);
@@ -1348,7 +1348,7 @@
 					}
 				} else {
 do_clear:
-					if (CmdFailed(DoCommandByTile(cur_tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR)))
+					if (CmdFailed(DoCommand(cur_tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR)))
 						return false;
 				}
 			}
@@ -1474,7 +1474,7 @@
 			size = it->ti.y;
 			if (size > i->height)i->height = size;
 
-			DoCommandByTile(cur_tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+			DoCommand(cur_tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 
 			MakeIndustry(cur_tile, i->index, it->gfx);
 			if (_generating_world) _m[cur_tile].m1 = 0x1E; /* maturity */
@@ -1499,15 +1499,14 @@
 }
 
 /** Build/Fund an industry
- * @param x,y coordinates where industry is built
+ * @param tile tile where industry is built
  * @param p1 industry type @see build_industry.h and @see industry.h
  * @param p2 unused
  */
-int32 CmdBuildIndustry(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildIndustry(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	const Town* t;
 	Industry *i;
-	TileIndex tile = TileVirtXY(x, y);
 	int num;
 	const IndustryTileTable * const *itt;
 	const IndustryTileTable *it;
diff -r d53bc3e794bd -r 35d747bb5e82 landscape.c
--- a/landscape.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/landscape.c	Mon Apr 10 07:15:58 2006 +0000
@@ -272,27 +272,27 @@
 }
 
 /** Clear a piece of landscape
- * @param x,y coordinates of clearance
+ * @param tile tile to clear
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdLandscapeClear(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdLandscapeClear(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
-
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
 
 	return _tile_type_procs[GetTileType(tile)]->clear_tile_proc(tile, flags);
 }
 
 /** Clear a big piece of landscape
- * @param x,y end coordinates of area dragging
+ * @param tile end tile of area dragging
  * @param p1 start tile of area dragging
  * @param p2 unused
  */
-int32 CmdClearArea(int ex, int ey, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdClearArea(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int32 cost, ret, money;
+	int ex;
+	int ey;
 	int sx,sy;
 	int x,y;
 	bool success = false;
@@ -302,6 +302,8 @@
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
 
 	// make sure sx,sy are smaller than ex,ey
+	ex = TileX(tile) * TILE_SIZE;
+	ey = TileY(tile) * TILE_SIZE;
 	sx = TileX(p1) * TILE_SIZE;
 	sy = TileY(p1) * TILE_SIZE;
 	if (ex < sx) intswap(ex, sx);
@@ -312,7 +314,7 @@
 
 	for (x = sx; x <= ex; x += TILE_SIZE) {
 		for (y = sy; y <= ey; y += TILE_SIZE) {
-			ret = DoCommandByTile(TileVirtXY(x, y), 0, 0, flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);
+			ret = DoCommand(TileVirtXY(x, y), 0, 0, flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);
 			if (CmdFailed(ret)) continue;
 			cost += ret;
 			success = true;
@@ -322,7 +324,7 @@
 					_additional_cash_required = ret;
 					return cost - ret;
 				}
-				DoCommandByTile(TileVirtXY(x, y), 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+				DoCommand(TileVirtXY(x, y), 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 
 				// draw explosion animation...
 				if ((x == sx || x == ex) && (y == sy || y == ey)) {
diff -r d53bc3e794bd -r 35d747bb5e82 misc_cmd.c
--- a/misc_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/misc_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -15,11 +15,11 @@
 #include "variables.h"
 
 /** Change the player's face.
- * @param x,y unused
+ * @param tile unused
  * @param p1 unused
  * @param p2 face bitmasked
  */
-int32 CmdSetPlayerFace(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSetPlayerFace(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	if (flags & DC_EXEC) {
 		GetPlayer(_current_player)->face = p2;
@@ -29,11 +29,11 @@
 }
 
 /** Change the player's company-colour
- * @param x,y unused
+ * @param tile unused
  * @param p1 unused
  * @param p2 new colour for vehicles, property, etc.
  */
-int32 CmdSetPlayerColor(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSetPlayerColor(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Player *p, *pp;
 	byte colour;
@@ -58,11 +58,11 @@
 }
 
 /** Increase the loan of your company.
- * @param x,y unused
+ * @param tile unused
  * @param p1 unused
  * @param p2 when set, loans the maximum amount in one go (press CTRL)
  */
-int32 CmdIncreaseLoan(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdIncreaseLoan(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Player *p;
 
@@ -87,11 +87,11 @@
 }
 
 /** Decrease the loan of your company.
- * @param x,y unused
+ * @param tile unused
  * @param p1 unused
  * @param p2 when set, pays back the maximum loan permitting money (press CTRL)
  */
-int32 CmdDecreaseLoan(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdDecreaseLoan(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Player *p;
 	int32 loan;
@@ -127,11 +127,11 @@
 }
 
 /** Change the name of the company.
- * @param x,y unused
+ * @param tile unused
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdChangeCompanyName(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdChangeCompanyName(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	StringID str;
 	Player *p;
@@ -153,11 +153,11 @@
 }
 
 /** Change the name of the president.
- * @param x,y unused
+ * @param tile unused
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdChangePresidentName(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdChangePresidentName(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	StringID str;
 	Player *p;
@@ -177,7 +177,7 @@
 
 			snprintf(buf, lengthof(buf), "%s Transport", _cmd_text);
 			_cmd_text = buf;
-			DoCommandByTile(0, 0, 0, DC_EXEC, CMD_CHANGE_COMPANY_NAME);
+			DoCommand(0, 0, 0, DC_EXEC, CMD_CHANGE_COMPANY_NAME);
 		}
 		MarkWholeScreenDirty();
 	} else
@@ -190,11 +190,11 @@
  * Increase or decrease the pause counter. If the counter is zero,
  * the game is unpaused. A counter is used instead of a boolean value
  * to have more control over the game when saving/loading, etc.
- * @param x,y unused
+ * @param tile unused
  * @param p1 0 = decrease pause counter; 1 = increase pause counter
  * @param p2 unused
  */
-int32 CmdPause(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdPause(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	if (flags & DC_EXEC) {
 		_pause += (p1 == 1) ? 1 : -1;
@@ -208,11 +208,11 @@
 /** Change the financial flow of your company.
  * This is normally only enabled in offline mode, but if there is a debug
  * build, you can cheat (to test).
- * @param x,y unused
+ * @param tile unused
  * @param p1 the amount of money to receive (if negative), or spend (if positive)
  * @param p2 unused
  */
-int32 CmdMoneyCheat(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdMoneyCheat(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 #ifndef _DEBUG
 	if (_networking) return CMD_ERROR;
@@ -225,11 +225,11 @@
  * To prevent abuse	in multiplayer games you can only send money to other
  * players if you have paid off your loan (either explicitely, or implicitely
  * given the fact that you have more money than loan).
- * @param x,y unused
+ * @param tile unused
  * @param p1 the amount of money to transfer; max 20.000.000
  * @param p2 the player to transfer the money to
  */
-int32 CmdGiveMoney(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdGiveMoney(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	const Player *p = GetPlayer(_current_player);
 	int32 amount = min((int32)p1, 20000000);
@@ -256,12 +256,12 @@
  * We cannot really check for valid values of p2 (too much work mostly); stored
  * in file 'settings_gui.c' _game_setting_info[]; we'll just trust the server it knows
  * what to do and does this correctly
- * @param x,y unused
+ * @param tile unused
  * @param p1 the difficulty setting being changed. If it is -1, the difficulty level
  *           itself is changed. The new value is inside p2
  * @param p2 new value for a difficulty setting or difficulty level
  */
-int32 CmdChangeDifficultyLevel(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdChangeDifficultyLevel(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	if (p1 != (uint32)-1L && ((int32)p1 >= GAME_DIFFICULTY_NUM || (int32)p1 < 0)) return CMD_ERROR;
 
diff -r d53bc3e794bd -r 35d747bb5e82 misc_gui.c
--- a/misc_gui.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/misc_gui.c	Mon Apr 10 07:15:58 2006 +0000
@@ -147,7 +147,7 @@
 
 	old_money = p->money64;
 	p->money64 = p->player_money = 0x7fffffff;
-	lid.costclear = DoCommandByTile(tile, 0, 0, 0, CMD_LANDSCAPE_CLEAR);
+	lid.costclear = DoCommand(tile, 0, 0, 0, CMD_LANDSCAPE_CLEAR);
 	p->money64 = old_money;
 	UpdatePlayerMoney32(p);
 
diff -r d53bc3e794bd -r 35d747bb5e82 openttd.h
--- a/openttd.h	Sun Apr 09 18:35:24 2006 +0000
+++ b/openttd.h	Mon Apr 10 07:15:58 2006 +0000
@@ -295,7 +295,6 @@
 	byte width_1, width_2;
 } ViewportSign;
 
-typedef int32 CommandProc(int x, int y, uint32 flags, uint32 p1, uint32 p2);
 
 typedef void DrawTileProc(TileInfo *ti);
 typedef uint GetSlopeZProc(const TileInfo* ti);
diff -r d53bc3e794bd -r 35d747bb5e82 order_cmd.c
--- a/order_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/order_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -160,7 +160,7 @@
 
 
 /** Add an order to the orderlist of a vehicle.
- * @param x,y unused
+ * @param tile unused
  * @param p1 various bitstuffed elements
  * - p1 = (bit  0 - 15) - ID of the vehicle
  * - p1 = (bit 16 - 31) - the selected order (if any). If the last order is given,
@@ -168,7 +168,7 @@
  *                        only the first 8 bits used currently (bit 16 - 23) (max 255)
  * @param p2 packed order to insert
  */
-int32 CmdInsertOrder(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdInsertOrder(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 	VehicleID veh   = GB(p1,  0, 16);
@@ -427,11 +427,11 @@
 }
 
 /** Delete an order from the orderlist of a vehicle.
- * @param x,y unused
+ * @param tile unused
  * @param p1 the ID of the vehicle
  * @param p2 the order to delete (max 255)
  */
-int32 CmdDeleteOrder(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdDeleteOrder(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v, *u;
 	VehicleID veh_id = p1;
@@ -501,11 +501,11 @@
 }
 
 /** Goto next order of order-list.
- * @param x,y unused
+ * @param tile unused
  * @param p1 The ID of the vehicle which order is skipped
  * @param p2 unused
  */
-int32 CmdSkipOrder(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSkipOrder(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 	VehicleID veh_id = p1;
@@ -542,7 +542,7 @@
 
 
 /** Modify an order in the orderlist of a vehicle.
- * @param x,y unused
+ * @param tile unused
  * @param p1 various bitstuffed elements
  * - p1 = (bit  0 - 15) - ID of the vehicle
  * - p1 = (bit 16 - 31) - the selected order (if any). If the last order is given,
@@ -550,7 +550,7 @@
  *                        only the first 8 bits used currently (bit 16 - 23) (max 255)
  * @param p2 mode to change the order to (always set)
  */
-int32 CmdModifyOrder(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdModifyOrder(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 	Order *order;
@@ -617,7 +617,7 @@
  * - p1 = (bit 16-31) - source vehicle to clone orders from, if any (none for CO_UNSHARE)
  * @param p2 mode of cloning: CO_SHARE, CO_COPY, or CO_UNSHARE
  */
-int32 CmdCloneOrder(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdCloneOrder(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *dst;
 	VehicleID veh_src = GB(p1, 16, 16);
@@ -821,7 +821,7 @@
 }
 
 /** Restore the current order-index of a vehicle and sets service-interval.
- * @param x,y unused
+ * @param tile unused
  * @param p1 the ID of the vehicle
  * @param p2 various bistuffed elements
  * - p2 = (bit  0-15) - current order-index (p2 & 0xFFFF)
@@ -833,7 +833,7 @@
  * If we do want to backup/restore it, just add UnitID uid to BackuppedOrders, and
  * restore it as parameter 'y' (ugly hack I know) for example. "v->unitnumber = y;"
  */
-int32 CmdRestoreOrderIndex(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRestoreOrderIndex(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 	OrderID cur_ord = GB(p2,  0, 16);
diff -r d53bc3e794bd -r 35d747bb5e82 players.c
--- a/players.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/players.c	Mon Apr 10 07:15:58 2006 +0000
@@ -651,7 +651,7 @@
 }
 
 /** Change engine renewal parameters
- * @param x,y unused
+ * @param tile unused
  * @param p1 bits 0-3 command
  * - p1 = 0 - change auto renew bool
  * - p1 = 1 - change auto renew months
@@ -676,7 +676,7 @@
  * if p1 = 5, then
  * - p2 = enable renew_keep_length
  */
-int32 CmdReplaceVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdReplaceVehicle(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Player *p;
 	if (!(_current_player < MAX_PLAYERS))
@@ -784,7 +784,7 @@
 }
 
 /** Control the players: add, delete, etc.
- * @param x,y unused
+ * @param tile unused
  * @param p1 various functionality
  * - p1 = 0 - create a new player, Which player (network) it will be is in p2
  * - p1 = 1 - create a new AI player
@@ -802,7 +802,7 @@
  * @arg - network_server.c:838 DEF_SERVER_RECEIVE_COMMAND(PACKET_CLIENT_COMMAND)@n
  * @arg - network_client.c:536 DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_MAP) from where the map has been received
  */
-int32 CmdPlayerCtrl(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdPlayerCtrl(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	if (flags & DC_EXEC) _current_player = OWNER_NONE;
 
diff -r d53bc3e794bd -r 35d747bb5e82 rail_cmd.c
--- a/rail_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/rail_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -230,13 +230,12 @@
 static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}
 
 /** Build a single piece of rail
- * @param x,y coordinates on where to build
+ * @param tile tile  to build on
  * @param p1 railtype of being built piece (normal, mono, maglev)
  * @param p2 rail track to build
  */
-int32 CmdBuildSingleRail(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildSingleRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile;
 	uint tileh;
 	Track track = (Track)p2;
 	TrackBits trackbit;
@@ -245,7 +244,6 @@
 
 	if (!ValParamRailtype(p1) || !ValParamTrackOrientation(track)) return CMD_ERROR;
 
-	tile = TileVirtXY(x, y);
 	tileh = GetTileSlope(tile, NULL);
 	trackbit = TrackToTrackBits(track);
 
@@ -257,7 +255,7 @@
 					!IsBridgeMiddle(tile) ||
 					(GetBridgeAxis(tile) == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X) != trackbit) {
 				// Get detailed error message
-				return DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+				return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 			}
 
 			if (IsClearUnderBridge(tile)) {
@@ -271,7 +269,7 @@
 				return_cmd_error(STR_1007_ALREADY_BUILT);
 			} else {
 				// Get detailed error message
-				return DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+				return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 			}
 			break;
 
@@ -284,7 +282,7 @@
 					!IsTileOwner(tile, _current_player) ||
 					GetRailType(tile) != p1) {
 				// Get detailed error message
-				return DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+				return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 			}
 
 			ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
@@ -327,7 +325,7 @@
 			if (CmdFailed(ret)) return ret;
 			cost += ret;
 
-			ret = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+			ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 			if (CmdFailed(ret)) return ret;
 			cost += ret;
 
@@ -344,15 +342,14 @@
 }
 
 /** Remove a single piece of track
- * @param x,y coordinates for removal of track
+ * @param tile tile to remove track from
  * @param p1 unused
  * @param p2 rail orientation
  */
-int32 CmdRemoveSingleRail(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRemoveSingleRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Track track = (Track)p2;
 	TrackBits trackbit;
-	TileIndex tile;
 	int32 cost = _price.remove_rail;
 	bool crossing = false;
 
@@ -361,8 +358,6 @@
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
 
-	tile = TileVirtXY(x, y);
-
 	switch (GetTileType(tile)) {
 		case MP_TUNNELBRIDGE:
 			if (!IsBridge(tile) ||
@@ -407,7 +402,7 @@
 
 			/* Charge extra to remove signals on the track, if they are there */
 			if (HasSignalOnTrack(tile, track))
-				cost += DoCommand(x, y, track, 0, flags, CMD_REMOVE_SIGNALS);
+				cost += DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS);
 
 			if (flags & DC_EXEC) {
 				present ^= trackbit;
@@ -499,15 +494,17 @@
 }
 
 /** Build a stretch of railroad tracks.
- * @param x,y start tile of drag
+ * @param tile start tile of drag
  * @param p1 end tile of drag
  * @param p2 various bitstuffed elements
  * - p2 = (bit 0-3) - railroad type normal/maglev (0 = normal, 1 = mono, 2 = maglev)
  * - p2 = (bit 4-6) - track-orientation, valid values: 0-5 (Track enum)
  * - p2 = (bit 7)   - 0 = build, 1 = remove tracks
  */
-static int32 CmdRailTrackHelper(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+static int32 CmdRailTrackHelper(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
+	int x;
+	int y;
 	int ex, ey;
 	int32 ret, total_cost = 0;
 	Track track = (Track)GB(p2, 4, 3);
@@ -520,6 +517,8 @@
 	trackdir = TrackToTrackdir(track);
 
 	/* unpack end point */
+	x = TileX(tile) * TILE_SIZE;
+	y = TileY(tile) * TILE_SIZE;
 	ex = TileX(p1) * TILE_SIZE;
 	ey = TileY(p1) * TILE_SIZE;
 
@@ -530,7 +529,7 @@
 	if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, TileVirtXY(x, y));
 
 	for (;;) {
-		ret = DoCommand(x, y, railtype, TrackdirToTrack(trackdir), flags, (mode == 0) ? CMD_BUILD_SINGLE_RAIL : CMD_REMOVE_SINGLE_RAIL);
+		ret = DoCommand(TileVirtXY(x, y), railtype, TrackdirToTrack(trackdir), flags, (mode == 0) ? CMD_BUILD_SINGLE_RAIL : CMD_REMOVE_SINGLE_RAIL);
 
 		if (CmdFailed(ret)) {
 			if ((_error_message != STR_1007_ALREADY_BUILT) && (mode == 0))
@@ -555,32 +554,31 @@
  * Stub for the unified rail builder/remover
  * @see CmdRailTrackHelper
  */
-int32 CmdBuildRailroadTrack(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildRailroadTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	return CmdRailTrackHelper(x, y, flags, p1, CLRBIT(p2, 7));
+	return CmdRailTrackHelper(tile, flags, p1, CLRBIT(p2, 7));
 }
 
 /** Build rail on a stretch of track.
  * Stub for the unified rail builder/remover
  * @see CmdRailTrackHelper
  */
-int32 CmdRemoveRailroadTrack(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRemoveRailroadTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	return CmdRailTrackHelper(x, y, flags, p1, SETBIT(p2, 7));
+	return CmdRailTrackHelper(tile, flags, p1, SETBIT(p2, 7));
 }
 
 /** Build a train depot
- * @param x,y position of the train depot
+ * @param tile position of the train depot
  * @param p1 rail type
  * @param p2 entrance direction (DiagDirection)
  *
  * @todo When checking for the tile slope,
  * distingush between "Flat land required" and "land sloped in wrong direction"
  */
-int32 CmdBuildTrainDepot(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildTrainDepot(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Depot *d;
-	TileIndex tile = TileVirtXY(x, y);
 	int32 cost, ret;
 	uint tileh;
 
@@ -610,7 +608,7 @@
 		return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
 	}
 
-	ret = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(ret)) return CMD_ERROR;
 	cost = ret;
 
@@ -634,16 +632,15 @@
 
 /** Build signals, alternate between double/single, signal/semaphore,
  * pre/exit/combo-signals, and what-else not
- * @param x,y coordinates where signals is being built
+ * @param tile tile where to build the signals
  * @param p1 various bitstuffed elements
  * - p1 = (bit 0-2) - track-orientation, valid values: 0-5 (Track enum)
  * - p1 = (bit 3)   - choose semaphores/signals or cycle normal/pre/exit/combo depending on context
  * @param p2 used for CmdBuildManySignals() to copy direction of first signal
  * TODO: p2 should be replaced by two bits for "along" and "against" the track.
  */
-int32 CmdBuildSingleSignal(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildSingleSignal(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
 	SignalVariant sigvar;
 	bool pre_signal;
 	Track track = (Track)(p1 & 0x7);
@@ -750,7 +747,7 @@
 }
 
 /**	Build many signals by dragging; AutoSignals
- * @param x,y start tile of drag
+ * @param tile start tile of drag
  * @param p1  end tile of drag
  * @param p2 various bitstuffed elements
  * - p2 = (bit  0)    - 0 = build, 1 = remove signals
@@ -758,12 +755,13 @@
  * - p2 = (bit  4- 6) - track-orientation, valid values: 0-5 (Track enum)
  * - p2 = (bit 24-31) - user defined signals_density
  */
-static int32 CmdSignalTrackHelper(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+static int32 CmdSignalTrackHelper(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
+	int x;
+	int y;
 	int ex, ey;
 	int32 ret, total_cost, signal_ctr;
 	byte signals;
-	TileIndex tile = TileVirtXY(x, y);
 	bool error = true;
 
 	int mode = p2 & 0x1;
@@ -785,6 +783,8 @@
 		signal_density *= 2;
 
 	// unpack end tile
+	x = TileX(tile) * TILE_SIZE;
+	y = TileY(tile) * TILE_SIZE;
 	ex = TileX(p1) * TILE_SIZE;
 	ey = TileY(p1) * TILE_SIZE;
 
@@ -814,7 +814,7 @@
 	for (;;) {
 		// only build/remove signals with the specified density
 		if ((signal_ctr % signal_density) == 0 ) {
-			ret = DoCommand(x, y, TrackdirToTrack(trackdir) | semaphores, signals, flags, (mode == 1) ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
+			ret = DoCommand(TileVirtXY(x, y), TrackdirToTrack(trackdir) | semaphores, signals, flags, (mode == 1) ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
 
 			/* Abort placement for any other error than NOT_SUITABLE_TRACK
 			 * This includes vehicles on track, competitor's tracks, etc. */
@@ -843,18 +843,17 @@
  * Stub for the unified signal builder/remover
  * @see CmdSignalTrackHelper
  */
-int32 CmdBuildSignalTrack(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildSignalTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	return CmdSignalTrackHelper(x, y, flags, p1, p2);
+	return CmdSignalTrackHelper(tile, flags, p1, p2);
 }
 
 /** Remove signals
- * @param x,y coordinates where signal is being deleted from
+ * @param tile coordinates where signal is being deleted from
  * @param p1 track to remove signal from (Track enum)
  */
-int32 CmdRemoveSingleSignal(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRemoveSingleSignal(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
 	Track track = (Track)(p1 & 0x7);
 
 	if (!ValParamTrackOrientation(track) || !IsTileType(tile, MP_RAILWAY) || !EnsureNoVehicle(tile))
@@ -891,9 +890,9 @@
  * Stub for the unified signal builder/remover
  * @see CmdSignalTrackHelper
  */
-int32 CmdRemoveSignalTrack(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRemoveSignalTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	return CmdSignalTrackHelper(x, y, flags, p1, SETBIT(p2, 0));
+	return CmdSignalTrackHelper(tile, flags, p1, SETBIT(p2, 0));
 }
 
 typedef int32 DoConvertRailProc(TileIndex tile, RailType totype, bool exec);
@@ -922,13 +921,15 @@
 
 /** Convert one rail type to the other. You can convert normal rail to
  * monorail/maglev easily or vice-versa.
- * @param ex,ey end tile of rail conversion drag
+ * @param tile end tile of rail conversion drag
  * @param p1 start tile of drag
  * @param p2 new railtype to convert to
  */
-int32 CmdConvertRail(int ex, int ey, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdConvertRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int32 ret, cost, money;
+	int ex;
+	int ey;
 	int sx, sy, x, y;
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
@@ -937,6 +938,8 @@
 	if (p1 >= MapSize()) return CMD_ERROR;
 
 	// make sure sx,sy are smaller than ex,ey
+	ex = TileX(tile) * TILE_SIZE;
+	ey = TileY(tile) * TILE_SIZE;
 	sx = TileX(p1) * TILE_SIZE;
 	sy = TileY(p1) * TILE_SIZE;
 	if (ex < sx) intswap(ex, sx);
@@ -1019,12 +1022,12 @@
 		/* XXX: Why the fuck do we remove these thow signals first? */
 		case RAIL_TYPE_SIGNALS:
 			if (HasSignalOnTrack(tile, TRACK_X)) {
-				ret = DoCommandByTile(tile, TRACK_X, 0, flags, CMD_REMOVE_SIGNALS);
+				ret = DoCommand(tile, TRACK_X, 0, flags, CMD_REMOVE_SIGNALS);
 				if (CmdFailed(ret)) return CMD_ERROR;
 				cost += ret;
 			}
 			if (HasSignalOnTrack(tile, TRACK_LOWER)) {
-				ret = DoCommandByTile(tile, TRACK_LOWER, 0, flags, CMD_REMOVE_SIGNALS);
+				ret = DoCommand(tile, TRACK_LOWER, 0, flags, CMD_REMOVE_SIGNALS);
 				if (CmdFailed(ret)) return CMD_ERROR;
 				cost += ret;
 			}
@@ -1041,7 +1044,7 @@
 
 			for (i = 0; m5 != 0; i++, m5 >>= 1) {
 				if (m5 & 1) {
-					ret = DoCommandByTile(tile, 0, i, flags, CMD_REMOVE_SINGLE_RAIL);
+					ret = DoCommand(tile, 0, i, flags, CMD_REMOVE_SINGLE_RAIL);
 					if (CmdFailed(ret)) return CMD_ERROR;
 					cost += ret;
 				}
@@ -2001,7 +2004,7 @@
 	if (new_player != OWNER_SPECTATOR) {
 		SetTileOwner(tile, new_player);
 	}	else {
-		DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+		DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 	}
 }
 
diff -r d53bc3e794bd -r 35d747bb5e82 rail_gui.c
--- a/rail_gui.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/rail_gui.c	Mon Apr 10 07:15:58 2006 +0000
@@ -480,7 +480,7 @@
 	case WE_PLACE_PRESIZE: {
 		TileIndex tile = e->place.tile;
 
-		DoCommandByTile(tile, 0, 0, DC_AUTO, CMD_BUILD_TUNNEL);
+		DoCommand(tile, 0, 0, DC_AUTO, CMD_BUILD_TUNNEL);
 		VpSetPresizeRange(tile, _build_tunnel_endtile == 0 ? tile : _build_tunnel_endtile);
 	} break;
 
diff -r d53bc3e794bd -r 35d747bb5e82 road_cmd.c
--- a/road_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/road_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -88,16 +88,15 @@
 
 
 /** Delete a piece of road.
- * @param x,y tile coordinates for road construction
+ * @param tile tile where to remove road from
  * @param p1 road piece flags
  * @param p2 unused
  */
-int32 CmdRemoveRoad(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRemoveRoad(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	// cost for removing inner/edge -roads
 	static const uint16 road_remove_cost[2] = {50, 18};
 
-	TileIndex tile;
 	PlayerID owner;
 	Town *t;
 	/* true if the roadpiece was always removeable,
@@ -111,8 +110,6 @@
 	if (p1 >> 4) return CMD_ERROR;
 	pieces = p1;
 
-	tile = TileVirtXY(x, y);
-
 	if (!IsTileType(tile, MP_STREET) && !IsTileType(tile, MP_TUNNELBRIDGE)) return CMD_ERROR;
 
 	owner = IsLevelCrossing(tile) ? GetCrossingRoadOwner(tile) : GetTileOwner(tile);
@@ -271,17 +268,16 @@
 }
 
 /** Build a piece of road.
- * @param x,y tile coordinates for road construction
+ * @param tile tile where to build road
  * @param p1 road piece flags
  * @param p2 the town that is building the road (0 if not applicable)
  */
-int32 CmdBuildRoad(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildRoad(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int32 cost = 0;
 	int32 ret;
 	RoadBits existing = 0;
 	RoadBits pieces;
-	TileIndex tile;
 	byte tileh;
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
@@ -291,7 +287,6 @@
 	if ((p1 >> 4) || (_current_player < MAX_PLAYERS && p2 != 0) || !IsTownIndex(p2)) return CMD_ERROR;
 	pieces = p1;
 
-	tile = TileVirtXY(x, y);
 	tileh = GetTileSlope(tile, NULL);
 
 	switch (GetTileType(tile)) {
@@ -388,7 +383,7 @@
 
 		default:
 do_clear:;
-			ret = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+			ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 			if (CmdFailed(ret)) return ret;
 			cost += ret;
 	}
@@ -439,16 +434,16 @@
 
 
 /** Build a long piece of road.
- * @param x,y end tile of drag
+ * @param end_tile end tile of drag
  * @param p1 start tile of drag
  * @param p2 various bitstuffed elements
  * - p2 = (bit 0) - start tile starts in the 2nd half of tile (p2 & 1)
  * - p2 = (bit 1) - end tile starts in the 2nd half of tile (p2 & 2)
  * - p2 = (bit 2) - direction: 0 = along x-axis, 1 = along y-axis (p2 & 4)
  */
-int32 CmdBuildLongRoad(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildLongRoad(TileIndex end_tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex start_tile, end_tile, tile;
+	TileIndex start_tile, tile;
 	int32 cost, ret;
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
@@ -456,7 +451,6 @@
 	if (p1 >= MapSize()) return CMD_ERROR;
 
 	start_tile = p1;
-	end_tile = TileVirtXY(x, y);
 
 	/* Only drag in X or Y direction dictated by the direction variable */
 	if (!HASBIT(p2, 2) && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
@@ -479,7 +473,7 @@
 		if (tile == end_tile && !HASBIT(p2, 1)) bits &= ROAD_NW | ROAD_NE;
 		if (tile == start_tile && HASBIT(p2, 0)) bits &= ROAD_SE | ROAD_SW;
 
-		ret = DoCommandByTile(tile, bits, 0, flags, CMD_BUILD_ROAD);
+		ret = DoCommand(tile, bits, 0, flags, CMD_BUILD_ROAD);
 		if (CmdFailed(ret)) {
 			if (_error_message != STR_1007_ALREADY_BUILT) return CMD_ERROR;
 		} else {
@@ -495,16 +489,16 @@
 }
 
 /** Remove a long piece of road.
- * @param x,y end tile of drag
+ * @param end_tile end tile of drag
  * @param p1 start tile of drag
  * @param p2 various bitstuffed elements
  * - p2 = (bit 0) - start tile starts in the 2nd half of tile (p2 & 1)
  * - p2 = (bit 1) - end tile starts in the 2nd half of tile (p2 & 2)
  * - p2 = (bit 2) - direction: 0 = along x-axis, 1 = along y-axis (p2 & 4)
  */
-int32 CmdRemoveLongRoad(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRemoveLongRoad(TileIndex end_tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex start_tile, end_tile, tile;
+	TileIndex start_tile, tile;
 	int32 cost, ret;
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
@@ -512,7 +506,6 @@
 	if (p1 >= MapSize()) return CMD_ERROR;
 
 	start_tile = p1;
-	end_tile = TileVirtXY(x, y);
 
 	/* Only drag in X or Y direction dictated by the direction variable */
 	if (!HASBIT(p2, 2) && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
@@ -537,7 +530,7 @@
 
 		// try to remove the halves.
 		if (bits != 0) {
-			ret = DoCommandByTile(tile, bits, 0, flags, CMD_REMOVE_ROAD);
+			ret = DoCommand(tile, bits, 0, flags, CMD_REMOVE_ROAD);
 			if (!CmdFailed(ret)) cost += ret;
 		}
 
@@ -550,26 +543,23 @@
 }
 
 /** Build a road depot.
- * @param x,y tile coordinates where the depot will be built
+ * @param tile tile where to build the depot
  * @param p1 entrance direction (DiagDirection)
  * @param p2 unused
  *
  * @todo When checking for the tile slope,
  * distingush between "Flat land required" and "land sloped in wrong direction"
  */
-int32 CmdBuildRoadDepot(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildRoadDepot(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int32 cost;
 	Depot *dep;
-	TileIndex tile;
 	uint tileh;
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
 
 	if (p1 > 3) return CMD_ERROR; // check direction
 
-	tile = TileVirtXY(x, y);
-
 	if (!EnsureNoVehicle(tile)) return CMD_ERROR;
 
 	tileh = GetTileSlope(tile, NULL);
@@ -581,7 +571,7 @@
 		return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
 	}
 
-	cost = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(cost)) return CMD_ERROR;
 
 	dep = AllocateDepot();
@@ -624,7 +614,7 @@
 					flags & DC_AUTO) {
 				return_cmd_error(STR_1801_MUST_REMOVE_ROAD_FIRST);
 			}
-			return DoCommandByTile(tile, b, 0, flags, CMD_REMOVE_ROAD);
+			return DoCommand(tile, b, 0, flags, CMD_REMOVE_ROAD);
 		}
 
 		case ROAD_CROSSING: {
@@ -632,11 +622,11 @@
 
 			if (flags & DC_AUTO) return_cmd_error(STR_1801_MUST_REMOVE_ROAD_FIRST);
 
-			ret = DoCommandByTile(tile, GetCrossingRoadBits(tile), 0, flags, CMD_REMOVE_ROAD);
+			ret = DoCommand(tile, GetCrossingRoadBits(tile), 0, flags, CMD_REMOVE_ROAD);
 			if (CmdFailed(ret)) return CMD_ERROR;
 
 			if (flags & DC_EXEC) {
-				DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+				DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 			}
 			return ret;
 		}
@@ -1092,7 +1082,7 @@
 
 			default:
 			case ROAD_DEPOT:
-				DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+				DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 				break;
 		}
 	}
diff -r d53bc3e794bd -r 35d747bb5e82 road_gui.c
--- a/road_gui.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/road_gui.c	Mon Apr 10 07:15:58 2006 +0000
@@ -270,7 +270,7 @@
 	case WE_PLACE_PRESIZE: {
 		TileIndex tile = e->place.tile;
 
-		DoCommandByTile(tile, 0x200, 0, DC_AUTO, CMD_BUILD_TUNNEL);
+		DoCommand(tile, 0x200, 0, DC_AUTO, CMD_BUILD_TUNNEL);
 		VpSetPresizeRange(tile, _build_tunnel_endtile==0?tile:_build_tunnel_endtile);
 		break;
 	}
diff -r d53bc3e794bd -r 35d747bb5e82 roadveh_cmd.c
--- a/roadveh_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/roadveh_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -101,16 +101,15 @@
 }
 
 /** Build a road vehicle.
- * @param x,y tile coordinates of depot where road vehicle is built
+ * @param tile tile of depot where road vehicle is built
  * @param p1 bus/truck type being built (engine)
  * @param p2 unused
  */
-int32 CmdBuildRoadVeh(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int32 cost;
 	Vehicle *v;
 	UnitID unit_num;
-	TileIndex tile = TileVirtXY(x, y);
 	Engine *e;
 
 	if (!IsEngineBuildable(p1, VEH_Road)) return_cmd_error(STR_ENGINE_NOT_BUILDABLE);
@@ -135,6 +134,9 @@
 		return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);
 
 	if (flags & DC_EXEC) {
+		int x;
+		int y;
+
 		const RoadVehicleInfo *rvi = RoadVehInfo(p1);
 
 		v->unitnumber = unit_num;
@@ -200,11 +202,11 @@
 }
 
 /** Start/Stop a road vehicle.
- * @param x,y unused
+ * @param tile unused
  * @param p1 road vehicle ID to start/stop
  * @param p2 unused
  */
-int32 CmdStartStopRoadVeh(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdStartStopRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
@@ -242,11 +244,11 @@
 }
 
 /** Sell a road vehicle.
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID to be sold
  * @param p2 unused
  */
-int32 CmdSellRoadVeh(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSellRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
@@ -342,11 +344,11 @@
 }
 
 /** Send a road vehicle to the depot.
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID to send to the depot
  * @param p2 unused
  */
-int32 CmdSendRoadVehToDepot(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSendRoadVehToDepot(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 	const Depot *dep;
@@ -390,11 +392,11 @@
 }
 
 /** Turn a roadvehicle around.
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID to turn
  * @param p2 unused
  */
-int32 CmdTurnRoadVeh(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdTurnRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
diff -r d53bc3e794bd -r 35d747bb5e82 settings.c
--- a/settings.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/settings.c	Mon Apr 10 07:15:58 2006 +0000
@@ -1403,7 +1403,7 @@
  * The new value is properly clamped to its minimum/maximum when setting
  * @see _patch_settings
  */
-int32 CmdChangePatchSetting(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdChangePatchSetting(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	const SettingDesc *sd = GetSettingDescription(p1);
 
diff -r d53bc3e794bd -r 35d747bb5e82 settings_gui.c
--- a/settings_gui.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/settings_gui.c	Mon Apr 10 07:15:58 2006 +0000
@@ -218,11 +218,11 @@
 }
 
 /** Change the side of the road vehicles drive on (server only).
- * @param x,y unused
+ * @param tile unused
  * @param p1 the side of the road; 0 = left side and 1 = right side
  * @param p2 unused
  */
-int32 CmdSetRoadDriveSide(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSetRoadDriveSide(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	/* Check boundaries and you can only change this if NO vehicles have been built yet,
 	 * except in the intro-menu where of course it's always possible to do so. */
diff -r d53bc3e794bd -r 35d747bb5e82 ship_cmd.c
--- a/ship_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/ship_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -809,16 +809,15 @@
 }
 
 /** Build a ship.
- * @param x,y tile coordinates of depot where ship is built
+ * @param tile tile of depot where ship is built
  * @param p1 ship type being built (engine)
  * @param p2 unused
  */
-int32 CmdBuildShip(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildShip(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int32 value;
 	Vehicle *v;
 	UnitID unit_num;
-	TileIndex tile = TileVirtXY(x, y);
 	Engine *e;
 
 	if (!IsEngineBuildable(p1, VEH_Ship)) return_cmd_error(STR_ENGINE_NOT_BUILDABLE);
@@ -839,6 +838,9 @@
 		return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);
 
 	if (flags & DC_EXEC) {
+		int x;
+		int y;
+
 		const ShipVehicleInfo *svi = ShipVehInfo(p1);
 
 		v->unitnumber = unit_num;
@@ -897,11 +899,11 @@
 }
 
 /** Sell a ship.
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID to be sold
  * @param p2 unused
  */
-int32 CmdSellShip(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSellShip(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
@@ -930,11 +932,11 @@
 }
 
 /** Start/Stop a ship.
- * @param x,y unused
+ * @param tile unused
  * @param p1 ship ID to start/stop
  * @param p2 unused
  */
-int32 CmdStartStopShip(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdStartStopShip(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
@@ -959,11 +961,11 @@
 }
 
 /** Send a ship to the depot.
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID to send to the depot
  * @param p2 unused
  */
-int32 CmdSendShipToDepot(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSendShipToDepot(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 	const Depot *dep;
@@ -1008,12 +1010,12 @@
 
 
 /** Refits a ship to the specified cargo type.
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID of the ship to refit
  * @param p2 various bitstuffed elements
  * - p2 = (bit 0-7) - the new cargo type to refit to (p2 & 0xFF)
  */
-int32 CmdRefitShip(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRefitShip(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 	int32 cost;
diff -r d53bc3e794bd -r 35d747bb5e82 ship_gui.c
--- a/ship_gui.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/ship_gui.c	Mon Apr 10 07:15:58 2006 +0000
@@ -88,7 +88,7 @@
 		WP(w,refit_d).cargo = DrawVehicleRefitWindow(v, WP(w, refit_d).sel);;
 
 		if (WP(w,refit_d).cargo != CT_INVALID) {
-			int32 cost = DoCommandByTile(v->tile, v->index, WP(w,refit_d).cargo, DC_QUERY_COST, CMD_REFIT_SHIP);
+			int32 cost = DoCommand(v->tile, v->index, WP(w,refit_d).cargo, DC_QUERY_COST, CMD_REFIT_SHIP);
 			if (!CmdFailed(cost)) {
 				SetDParam(2, cost);
 				SetDParam(0, _cargoc.names_long[WP(w,refit_d).cargo]);
diff -r d53bc3e794bd -r 35d747bb5e82 signs.c
--- a/signs.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/signs.c	Mon Apr 10 07:15:58 2006 +0000
@@ -104,11 +104,11 @@
 /** Place a sign at the given coordinates. Ownership of sign has
  * no effect whatsoever except for the colour the sign gets for easy recognition,
  * but everybody is able to rename/remove it.
- * @param x,y coordinates to place sign at
+ * @param tile tile to place sign at
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdPlaceSign(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdPlaceSign(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	SignStruct *ss;
 
@@ -118,6 +118,9 @@
 
 	/* When we execute, really make the sign */
 	if (flags & DC_EXEC) {
+		int x = TileX(tile) * TILE_SIZE;
+		int y = TileY(tile) * TILE_SIZE;
+
 		ss->str = STR_280A_SIGN;
 		ss->x = x;
 		ss->y = y;
@@ -136,11 +139,11 @@
 /** Rename a sign. If the new name of the sign is empty, we assume
  * the user wanted to delete it. So delete it. Ownership of signs
  * has no meaning/effect whatsoever except for eyecandy
- * @param x,y unused
+ * @param tile unused
  * @param p1 index of the sign to be renamed/removed
  * @param p2 unused
  */
-int32 CmdRenameSign(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRenameSign(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	if (!IsSignIndex(p1)) return CMD_ERROR;
 
diff -r d53bc3e794bd -r 35d747bb5e82 station_cmd.c
--- a/station_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/station_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -804,7 +804,7 @@
 				}
 			}
 		} else {
-			ret = DoCommandByTile(tile_cur, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+			ret = DoCommand(tile_cur, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 			if (CmdFailed(ret)) return ret;
 			cost += ret;
 		}
@@ -912,7 +912,7 @@
 }
 
 /** Build railroad station
- * @param x,y starting position of station dragging/placement
+ * @param tile_org starting position of station dragging/placement
  * @param p1 various bitstuffed elements
  * - p1 = (bit  0)    - orientation (p1 & 1)
  * - p1 = (bit  8-15) - number of tracks
@@ -922,10 +922,9 @@
  * - p2 = (bit  4)    - set for custom station (p2 & 0x10)
  * - p2 = (bit  8-..) - custom station id (p2 >> 8)
  */
-int32 CmdBuildRailroadStation(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildRailroadStation(TileIndex tile_org, uint32 flags, uint32 p1, uint32 p2)
 {
 	Station *st;
-	TileIndex tile_org;
 	int w_org, h_org;
 	int32 cost, ret;
 	StationID est;
@@ -935,8 +934,6 @@
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
 
-	tile_org = TileVirtXY(x, y);
-
 	/* Does the authority allow this? */
 	if (!(flags & DC_NO_TOWN_RATING) && !CheckIfAuthorityAllows(tile_org)) return CMD_ERROR;
 	if (!ValParamRailtype(p2 & 0xF)) return CMD_ERROR;
@@ -1124,13 +1121,12 @@
 
 /** Remove a single tile from a railroad station.
  * This allows for custom-built station with holes and weird layouts
- * @param x,y tile coordinates to remove
+ * @param tile tile of station piece to remove
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdRemoveFromRailroadStation(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRemoveFromRailroadStation(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
 	Station *st;
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
@@ -1196,7 +1192,7 @@
 
 	/* if there is flooding and non-uniform stations are enabled, remove platforms tile by tile */
 	if (_current_player == OWNER_WATER && _patches.nonuniform_stations)
-		return DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_REMOVE_FROM_RAILROAD_STATION);
+		return DoCommand(tile, 0, 0, DC_EXEC, CMD_REMOVE_FROM_RAILROAD_STATION);
 
 	/* Current player owns the station? */
 	if (_current_player != OWNER_WATER && !CheckOwnership(st->owner))
@@ -1284,17 +1280,16 @@
 }
 
 /** Build a bus station
- * @param x,y coordinates to build bus station at
+ * @param tile tile to build bus station at
  * @param p1 entrance direction (DiagDirection)
  * @param p2 0 for Bus stops, 1 for truck stops
  */
-int32 CmdBuildRoadStop(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildRoadStop(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Station *st;
 	RoadStop *road_stop;
 	RoadStop **currstop;
 	RoadStop *prev = NULL;
-	TileIndex tile;
 	int32 cost;
 	int32 ret;
 	bool type = !!p2;
@@ -1304,8 +1299,6 @@
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
 
-	tile = TileVirtXY(x, y);
-
 	if (!(flags & DC_NO_TOWN_RATING) && !CheckIfAuthorityAllows(tile))
 		return CMD_ERROR;
 
@@ -1500,13 +1493,12 @@
 };
 
 /** Place an Airport.
- * @param x,y tile coordinates where airport will be built
+ * @param tile tile where airport will be built
  * @param p1 airport type, @see airport.h
  * @param p2 unused
  */
-int32 CmdBuildAirport(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildAirport(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile;
 	Town *t;
 	Station *st;
 	int32 cost;
@@ -1519,8 +1511,6 @@
 	/* Check if a valid, buildable airport was chosen for construction */
 	if (p1 > lengthof(_airport_sections) || !HASBIT(GetValidAirports(), p1)) return CMD_ERROR;
 
-	tile = TileVirtXY(x, y);
-
 	if (!(flags & DC_NO_TOWN_RATING) && !CheckIfAuthorityAllows(tile))
 		return CMD_ERROR;
 
@@ -1673,13 +1663,12 @@
 }
 
 /** Build a buoy.
- * @param x,y tile coordinates of bouy construction
+ * @param tile tile where to place the bouy
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdBuildBuoy(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildBuoy(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
 	Station *st;
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
@@ -1774,13 +1763,12 @@
 static const byte _dock_h_chk[4] = { 1,2,1,2 };
 
 /** Build a dock/haven.
- * @param x,y tile coordinates where dock will be built
+ * @param tile tile where dock will be built
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdBuildDock(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildDock(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
 	TileIndex tile_cur;
 	DiagDirection direction;
 	int32 cost;
@@ -1798,7 +1786,7 @@
 
 	if (!EnsureNoVehicle(tile)) return CMD_ERROR;
 
-	cost = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(cost)) return CMD_ERROR;
 
 	tile_cur = tile + TileOffsByDir(direction);
@@ -1809,7 +1797,7 @@
 		return_cmd_error(STR_304B_SITE_UNSUITABLE);
 	}
 
-	cost = DoCommandByTile(tile_cur, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	cost = DoCommand(tile_cur, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(cost)) return CMD_ERROR;
 
 	tile_cur = tile_cur + TileOffsByDir(direction);
@@ -2427,11 +2415,11 @@
 }
 
 /** Rename a station
- * @param x,y unused
+ * @param tile unused
  * @param p1 station ID that is to be renamed
  * @param p2 unused
  */
-int32 CmdRenameStation(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRenameStation(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	StringID str;
 	Station *st;
@@ -2672,7 +2660,7 @@
 		_global_station_sort_dirty = true; // transfer ownership of station to another player
 		InvalidateWindowClasses(WC_STATION_LIST);
 	} else {
-		DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+		DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 	}
 }
 
diff -r d53bc3e794bd -r 35d747bb5e82 town_cmd.c
--- a/town_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/town_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -471,8 +471,8 @@
 			// No, try to build one in the direction.
 			// if that fails clear the land, and if that fails exit.
 			// This is to make sure that we can build a road here later.
-			if (CmdFailed(DoCommandByTile(tile, (dir & 1 ? ROAD_X : ROAD_Y), 0, DC_AUTO, CMD_BUILD_ROAD)) &&
-					CmdFailed(DoCommandByTile(tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR)))
+			if (CmdFailed(DoCommand(tile, (dir & 1 ? ROAD_X : ROAD_Y), 0, DC_AUTO, CMD_BUILD_ROAD)) &&
+					CmdFailed(DoCommand(tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR)))
 				return false;
 		}
 
@@ -500,10 +500,10 @@
 				int32 res;
 
 				if (CHANCE16I(1, 16, r)) {
-					res = DoCommandByTile(tile, slope, 0, DC_EXEC | DC_AUTO | DC_NO_WATER,
+					res = DoCommand(tile, slope, 0, DC_EXEC | DC_AUTO | DC_NO_WATER,
 					                      CMD_TERRAFORM_LAND);
 				} else {
-					res = DoCommandByTile(tile, slope^0xF, 1, DC_EXEC | DC_AUTO | DC_NO_WATER,
+					res = DoCommand(tile, slope ^ 0xF, 1, DC_EXEC | DC_AUTO | DC_NO_WATER,
 					                      CMD_TERRAFORM_LAND);
 				}
 				if (CmdFailed(res) && CHANCE16I(1, 3, r)) {
@@ -523,9 +523,9 @@
 
 	TILE_ASSERT(tile);
 
-	r = DoCommandByTile(tile, edges, dir, DC_AUTO | DC_NO_WATER, CMD_TERRAFORM_LAND);
+	r = DoCommand(tile, edges, dir, DC_AUTO | DC_NO_WATER, CMD_TERRAFORM_LAND);
 	if (CmdFailed(r) || r >= 126 * 16) return false;
-	DoCommandByTile(tile, edges, dir, DC_AUTO | DC_NO_WATER | DC_EXEC, CMD_TERRAFORM_LAND);
+	DoCommand(tile, edges, dir, DC_AUTO | DC_NO_WATER | DC_EXEC, CMD_TERRAFORM_LAND);
 	return true;
 }
 
@@ -654,7 +654,7 @@
 
 		default:
 build_road_and_exit:
-			if (!CmdFailed(DoCommandByTile(tile, rcmd, t1->index, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_BUILD_ROAD))) {
+			if (!CmdFailed(DoCommand(tile, rcmd, t1->index, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_BUILD_ROAD))) {
 				_grow_town_result = -1;
 			}
 			return;
@@ -681,7 +681,7 @@
 		do {
 			byte bridge_type = RandomRange(MAX_BRIDGES - 1);
 			if (CheckBridge_Stuff(bridge_type, bridge_len)) {
-				if (!CmdFailed(DoCommandByTile(tile, tmptile, 0x8000 + bridge_type, DC_EXEC | DC_AUTO, CMD_BUILD_BRIDGE)))
+				if (!CmdFailed(DoCommand(tile, tmptile, 0x8000 + bridge_type, DC_EXEC | DC_AUTO, CMD_BUILD_BRIDGE)))
 					_grow_town_result = -1;
 
 				// obviously, if building any bridge would fail, there is no need to try other bridge-types
@@ -795,8 +795,8 @@
 		// Only work with plain land that not already has a house with GetHouseConstructionTick=0
 		if ((!IsTileType(tile, MP_HOUSE) || GetHouseConstructionTick(tile) != 0) &&
 				GetTileSlope(tile, NULL) == 0) {
-			if (!CmdFailed(DoCommandByTile(tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR))) {
-				DoCommandByTile(tile, GenRandomRoadBits(), t->index, DC_EXEC | DC_AUTO, CMD_BUILD_ROAD);
+			if (!CmdFailed(DoCommand(tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR))) {
+				DoCommand(tile, GenRandomRoadBits(), t->index, DC_EXEC | DC_AUTO, CMD_BUILD_ROAD);
 				_current_player = old_player;
 				return true;
 			}
@@ -994,13 +994,12 @@
 /** Create a new town.
  * This obviously only works in the scenario editor. Function not removed
  * as it might be possible in the future to fund your own town :)
- * @param x,y coordinates where town is built
+ * @param tile coordinates where town is built
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdBuildTown(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildTown(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
 	Town *t;
 	uint32 townnameparts;
 
@@ -1114,7 +1113,7 @@
 	if (b)
 		return false;
 
-	return !CmdFailed(DoCommandByTile(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR));
+	return !CmdFailed(DoCommand(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR));
 }
 
 int GetTownRadiusGroup(const Town *t, TileIndex tile)
@@ -1151,7 +1150,7 @@
 
 		if (GetTileSlope(tile, NULL)) return false;
 
-		if (CmdFailed(DoCommandByTile(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER | DC_FORCETEST, CMD_LANDSCAPE_CLEAR)))
+		if (CmdFailed(DoCommand(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER | DC_FORCETEST, CMD_LANDSCAPE_CLEAR)))
 			return false;
 	}
 
@@ -1286,7 +1285,7 @@
 	if (!EnsureNoVehicle(tile)) return false;
 	if (GetTileSlope(tile, NULL) & 0x10) return false;
 
-	r = DoCommandByTile(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR);
+	r = DoCommand(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(r)) return false;
 
 	DoBuildTownHouse(t, tile);
@@ -1358,11 +1357,11 @@
 }
 
 /** Rename a town (server-only).
- * @param x,y unused
+ * @param tile unused
  * @param p1 town ID to rename
  * @param p2 unused
  */
-int32 CmdRenameTown(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRenameTown(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	StringID str;
 	Town *t;
@@ -1410,14 +1409,14 @@
 		switch (GetTileType(tile)) {
 			case MP_HOUSE:
 				if (GetTownByTile(tile) == t)
-					DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+					DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 				break;
 
 			case MP_STREET:
 			case MP_TUNNELBRIDGE:
 				if (IsTileOwner(tile, OWNER_TOWN) &&
 						ClosestTownFromTile(tile, (uint)-1) == t)
-					DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+					DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 				break;
 
 			default:
@@ -1499,7 +1498,7 @@
 
 	old = _current_player;
 	_current_player = OWNER_NONE;
-	r = DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+	r = DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 	_current_player = old;
 
 	if (CmdFailed(r)) return false;
@@ -1611,11 +1610,11 @@
 /** Do a town action.
  * This performs an action such as advertising, building a statue, funding buildings,
  * but also bribing the town-council
- * @param x,y unused
+ * @param tile unused
  * @param p1 town to do the action at
  * @param p2 action to perform, @see _town_action_proc for the list of available actions
  */
-int32 CmdDoTownAction(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdDoTownAction(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int32 cost;
 	Town *t;
diff -r d53bc3e794bd -r 35d747bb5e82 train_cmd.c
--- a/train_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/train_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -655,7 +655,7 @@
 		if (v->type == VEH_Train && IsFreeWagon(v) &&
 				v->tile == u->tile &&
 				v->u.rail.track == 0x80) {
-			if (CmdFailed(DoCommandByTile(0, v->index | (u->index << 16), 1, DC_EXEC,
+			if (CmdFailed(DoCommand(0, v->index | (u->index << 16), 1, DC_EXEC,
 					CMD_MOVE_RAIL_VEHICLE)))
 				break;
 		}
@@ -696,18 +696,17 @@
 }
 
 /** Build a railroad vehicle.
- * @param x,y tile coordinates (depot) where rail-vehicle is built
+ * @param tile tile of the depot where rail-vehicle is built
  * @param p1 engine type id
  * @param p2 bit 0 prevents any free cars from being added to the train
  */
-int32 CmdBuildRailVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildRailVehicle(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	const RailVehicleInfo *rvi;
 	int value;
 	Vehicle *v;
 	UnitID unit_num;
 	Engine *e;
-	TileIndex tile = TileVirtXY(x, y);
 	uint num_vehicles;
 
 	/* Check if the engine-type is valid (for the player) */
@@ -748,17 +747,16 @@
 			return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);
 
 		if (flags & DC_EXEC) {
-			DiagDirection dir;
+			DiagDirection dir = GetRailDepotDirection(tile);
+			int x = TileX(tile) * TILE_SIZE + _vehicle_initial_x_fract[dir];
+			int y = TileY(tile) * TILE_SIZE + _vehicle_initial_y_fract[dir];
 
 			v->unitnumber = unit_num;
-
-			dir = GetRailDepotDirection(tile);
-
 			v->direction = DiagDirToDir(dir);
 			v->tile = tile;
 			v->owner = _current_player;
-			v->x_pos = (x |= _vehicle_initial_x_fract[dir]);
-			v->y_pos = (y |= _vehicle_initial_y_fract[dir]);
+			v->x_pos = x;
+			v->y_pos = y;
 			v->z_pos = GetSlopeZ(x,y);
 			v->z_height = 6;
 			v->u.rail.track = 0x80;
@@ -938,13 +936,13 @@
 }
 
 /** Move a rail vehicle around inside the depot.
- * @param x,y unused
+ * @param tile unused
  * @param p1 various bitstuffed elements
  * - p1 (bit  0 - 15) source vehicle index
  * - p1 (bit 16 - 31) what wagon to put the source wagon AFTER, XXX - INVALID_VEHICLE to make a new line
  * @param p2 (bit 0) move all vehicles following the source vehicle
  */
-int32 CmdMoveRailVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdMoveRailVehicle(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	VehicleID s = GB(p1, 0, 16);
 	VehicleID d = GB(p1, 16, 16);
@@ -1171,7 +1169,7 @@
 		 * To do this, CmdMoveRailVehicle must be called once more
 		 * we can't loop forever here because next time we reach this line we will have a front engine */
 		if (src_head != NULL && !IsFrontEngine(src_head) && IsTrainEngine(src_head)) {
-			CmdMoveRailVehicle(x, y, flags, src_head->index | (INVALID_VEHICLE << 16), 1);
+			CmdMoveRailVehicle(0, flags, src_head->index | (INVALID_VEHICLE << 16), 1);
 			src_head = NULL;	// don't do anything more to this train since the new call will do it
 		}
 
@@ -1210,11 +1208,11 @@
 }
 
 /** Start/Stop a train.
- * @param x,y unused
+ * @param tile unused
  * @param p1 train to start/stop
  * @param p2 unused
  */
-int32 CmdStartStopTrain(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdStartStopTrain(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
@@ -1238,7 +1236,7 @@
 }
 
 /** Sell a (single) train wagon/engine.
- * @param x,y unused
+ * @param tile unused
  * @param p1 the wagon/engine index
  * @param p2 the selling mode
  * - p2 = 0: only sell the single dragged wagon/engine (and any belonging rear-engines)
@@ -1247,7 +1245,7 @@
  * - p2 = 2: when selling attached locos, rearrange all vehicles after it to separate lines;
  *           all wagons of the same type will go on the same line. Used by the AI currently
  */
-int32 CmdSellRailWagon(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSellRailWagon(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v, *tmp, *first;
 	Vehicle *new_f = NULL;
@@ -1355,7 +1353,7 @@
 				if (p2 == 2 && HASBIT(ori_subtype, Train_Front)) {
 					for (v = first; v != NULL; v = tmp) {
 						tmp = GetNextVehicle(v);
-						DoCommandByTile(v->tile, v->index | INVALID_VEHICLE << 16, 0, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
+						DoCommand(v->tile, v->index | INVALID_VEHICLE << 16, 0, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
 					}
 				}
 			}
@@ -1632,11 +1630,11 @@
 }
 
 /** Reverse train.
- * @param x,y unused
+ * @param tile unused
  * @param p1 train to reverse
  * @param p2 if true, reverse a unit in a train (needs to be in a depot)
  */
- int32 CmdReverseTrainDirection(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdReverseTrainDirection(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
@@ -1681,11 +1679,11 @@
 }
 
 /** Force a train through a red signal
- * @param x,y unused
+ * @param tile unused
  * @param p1 train to ignore the red signal
  * @param p2 unused
  */
-int32 CmdForceTrainProceed(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdForceTrainProceed(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 
@@ -1701,11 +1699,11 @@
 }
 
 /** Refits a train to the specified cargo type.
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID of the train to refit
  * @param p2 the new cargo type to refit to (p2 & 0xFF)
  */
-int32 CmdRefitRailVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRefitRailVehicle(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	CargoID new_cid = GB(p2, 0, 8);
 	Vehicle *v;
@@ -1873,11 +1871,11 @@
 }
 
 /** Send a train to a depot
- * @param x,y unused
+ * @param tile unused
  * @param p1 train to send to the depot
  * @param p2 unused
  */
-int32 CmdSendTrainToDepot(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdSendTrainToDepot(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 	TrainFindDepotData tfdd;
@@ -1916,7 +1914,7 @@
 		InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);
 		/* If there is no depot in front, reverse automatically */
 		if (tfdd.reverse)
-			DoCommandByTile(v->tile, v->index, 0, DC_EXEC, CMD_REVERSE_TRAIN_DIRECTION);
+			DoCommand(v->tile, v->index, 0, DC_EXEC, CMD_REVERSE_TRAIN_DIRECTION);
 	}
 
 	return 0;
diff -r d53bc3e794bd -r 35d747bb5e82 train_gui.c
--- a/train_gui.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/train_gui.c	Mon Apr 10 07:15:58 2006 +0000
@@ -810,7 +810,7 @@
 		WP(w,refit_d).cargo = DrawVehicleRefitWindow(v, WP(w, refit_d).sel);
 
 		if (WP(w,refit_d).cargo != CT_INVALID) {
-			int32 cost = DoCommandByTile(v->tile, v->index, WP(w,refit_d).cargo, DC_QUERY_COST, CMD_REFIT_RAIL_VEHICLE);
+			int32 cost = DoCommand(v->tile, v->index, WP(w,refit_d).cargo, DC_QUERY_COST, CMD_REFIT_RAIL_VEHICLE);
 			if (!CmdFailed(cost)) {
 				SetDParam(2, cost);
 				SetDParam(0, _cargoc.names_long[WP(w,refit_d).cargo]);
diff -r d53bc3e794bd -r 35d747bb5e82 tree_cmd.c
--- a/tree_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/tree_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -124,14 +124,16 @@
 }
 
 /** Plant a tree.
- * @param x,y start tile of area-drag of tree plantation
+ * @param tile start tile of area-drag of tree plantation
  * @param p1 tree type, -1 means random.
  * @param p2 end tile of area-drag
  */
-int32 CmdPlantTree(int ex, int ey, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdPlantTree(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	StringID msg = INVALID_STRING_ID;
 	int32 cost;
+	int ex;
+	int ey;
 	int sx, sy, x, y;
 
 	if (p2 >= MapSize()) return CMD_ERROR;
@@ -141,10 +143,10 @@
 	SET_EXPENSES_TYPE(EXPENSES_OTHER);
 
 	// make sure sx,sy are smaller than ex,ey
+	ex = TileX(tile);
+	ey = TileY(tile);
 	sx = TileX(p2);
 	sy = TileY(p2);
-	ex /= TILE_SIZE;
-	ey /= TILE_SIZE;
 	if (ex < sx) intswap(ex, sx);
 	if (ey < sy) intswap(ey, sy);
 
diff -r d53bc3e794bd -r 35d747bb5e82 tunnelbridge_cmd.c
--- a/tunnelbridge_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/tunnelbridge_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -170,17 +170,19 @@
 }
 
 /** Build a Bridge
- * @param x,y end tile coord
+ * @param end_tile end tile
  * @param p1 packed start tile coords (~ dx)
  * @param p2 various bitstuffed elements
  * - p2 = (bit 0- 7) - bridge type (hi bh)
  * - p2 = (bit 8-..) - rail type. bit15 ((x>>8)&0x80) means road bridge.
  */
-int32 CmdBuildBridge(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildBridge(TileIndex end_tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int bridge_type;
 	TransportType transport;
 	RailType railtype;
+	int x;
+	int y;
 	int sx,sy;
 	TileIndex tile_start;
 	TileIndex tile_end;
@@ -214,6 +216,8 @@
 		transport = TRANSPORT_RAIL;
 	}
 
+	x = TileX(end_tile) * TILE_SIZE;
+	y = TileY(end_tile) * TILE_SIZE;
 	sx = TileX(p1) * TILE_SIZE;
 	sy = TileY(p1) * TILE_SIZE;
 
@@ -268,7 +272,7 @@
 
 	/* Try and clear the start landscape */
 
-	ret = DoCommandByTile(tile_start, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	ret = DoCommand(tile_start, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(ret)) return ret;
 	cost = ret;
 
@@ -280,7 +284,7 @@
 
 	/* Try and clear the end landscape */
 
-	ret = DoCommandByTile(tile_end, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	ret = DoCommand(tile_end, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(ret)) return ret;
 	cost += ret;
 
@@ -352,7 +356,7 @@
 			default:
 not_valid_below:;
 				/* try and clear the middle landscape */
-				ret = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+				ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 				if (CmdFailed(ret)) return ret;
 				cost += ret;
 				transport_under = INVALID_TRANSPORT;
@@ -425,14 +429,13 @@
 
 
 /** Build Tunnel.
- * @param x,y start tile coord of tunnel
+ * @param tile start tile of tunnel
  * @param p1 railtype, 0x200 for road tunnel
  * @param p2 unused
  */
-int32 CmdBuildTunnel(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildTunnel(TileIndex start_tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	TileIndexDiff delta;
-	TileIndex start_tile;
 	TileIndex end_tile;
 	DiagDirection direction;
 	uint start_tileh;
@@ -446,7 +449,6 @@
 
 	if (p1 != 0x200 && !ValParamRailtype(p1)) return CMD_ERROR;
 
-	start_tile = TileVirtXY(x, y);
 	start_tileh = GetTileSlope(start_tile, &start_z);
 
 	switch (start_tileh) {
@@ -457,7 +459,7 @@
 		default: return_cmd_error(STR_500B_SITE_UNSUITABLE_FOR_TUNNEL);
 	}
 
-	ret = DoCommandByTile(start_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	ret = DoCommand(start_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(ret)) return ret;
 	cost = _price.build_tunnel + ret;
 
@@ -483,10 +485,10 @@
 
 	// slope of end tile must be complementary to the slope of the start tile
 	if (end_tileh != (15 ^ start_tileh)) {
-		ret = DoCommandByTile(end_tile, end_tileh & start_tileh, 0, flags, CMD_TERRAFORM_LAND);
+		ret = DoCommand(end_tile, end_tileh & start_tileh, 0, flags, CMD_TERRAFORM_LAND);
 		if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
 	} else {
-		ret = DoCommandByTile(end_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+		ret = DoCommand(end_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 		if (CmdFailed(ret)) return ret;
 	}
 	cost += _price.build_tunnel + ret;
@@ -1297,7 +1299,7 @@
 				SetTileOwner(tile, OWNER_NONE);
 			}
 		} else {
-			DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+			DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 		}
 	}
 }
diff -r d53bc3e794bd -r 35d747bb5e82 unmovable_cmd.c
--- a/unmovable_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/unmovable_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -82,14 +82,13 @@
 }
 
 /** Build or relocate the HQ. This depends if the HQ is already built or not
- * @param x,y the coordinates where the HQ will be built or relocated to
+ * @param tile tile where the HQ will be built or relocated to
  * @param p1 unused
  * @param p2 unused
  */
 extern int32 CheckFlatLandBelow(TileIndex tile, uint w, uint h, uint flags, uint invalid_dirs, int *);
-int32 CmdBuildCompanyHQ(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildCompanyHQ(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
 	Player *p = GetPlayer(_current_player);
 	int cost;
 	int32 ret;
@@ -219,7 +218,7 @@
 	}
 
 	if (IsOwnedLand(tile)) {
-		return DoCommandByTile(tile, 0, 0, flags, CMD_SELL_LAND_AREA);
+		return DoCommand(tile, 0, 0, flags, CMD_SELL_LAND_AREA);
 	}
 
 	// checks if you're allowed to remove unmovable things
diff -r d53bc3e794bd -r 35d747bb5e82 vehicle.c
--- a/vehicle.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/vehicle.c	Mon Apr 10 07:15:58 2006 +0000
@@ -1493,11 +1493,11 @@
 }
 
 /** Clone a vehicle. If it is a train, it will clone all the cars too
-* @param x,y depot where the cloned vehicle is build
+* @param tile tile of the depot where the cloned vehicle is build
 * @param p1 the original vehicle's index
 * @param p2 1 = shared orders, else copied orders
 */
-int32 CmdCloneVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdCloneVehicle(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v_front, *v;
 	Vehicle *w_front, *w, *w_rear;
@@ -1544,7 +1544,7 @@
 			continue;
 		}
 
-		cost = DoCommand(x, y, v->engine_type, 1, flags, CMD_BUILD_VEH(v->type));
+		cost = DoCommand(tile, v->engine_type, 1, flags, CMD_BUILD_VEH(v->type));
 
 		if (CmdFailed(cost)) return cost;
 
@@ -1557,18 +1557,18 @@
 				if (v->cargo_type != w->cargo_type) {
 					// we can't pay for refitting because we can't estimate refitting costs for a vehicle before it's build
 					// if we pay for it anyway, the cost and the estimated cost will not be the same and we will have an assert
-					DoCommand(x, y, w->index, v->cargo_type, flags, CMD_REFIT_VEH(v->type));
+					DoCommand(0, w->index, v->cargo_type, flags, CMD_REFIT_VEH(v->type));
 				}
 			}
 
 			if (v->type == VEH_Train && !IsFrontEngine(v)) {
 				// this s a train car
 				// add this unit to the end of the train
-				DoCommand(x, y, (w_rear->index << 16) | w->index, 1, flags, CMD_MOVE_RAIL_VEHICLE);
+				DoCommand(0, (w_rear->index << 16) | w->index, 1, flags, CMD_MOVE_RAIL_VEHICLE);
 			} else {
 				// this is a front engine or not a train. It need orders
 				w_front = w;
-				DoCommand(x, y, (v->index << 16) | w->index, p2 & 1 ? CO_SHARE : CO_COPY, flags, CMD_CLONE_ORDER);
+				DoCommand(0, (v->index << 16) | w->index, p2 & 1 ? CO_SHARE : CO_COPY, flags, CMD_CLONE_ORDER);
 			}
 			w_rear = w;	// trains needs to know the last car in the train, so they can add more in next loop
 		}
@@ -1633,7 +1633,7 @@
 	new_engine_type = EngineReplacementForPlayer(p, old_v->engine_type);
 	if (new_engine_type == INVALID_ENGINE) new_engine_type = old_v->engine_type;
 
-	cost = DoCommand(old_v->x_pos, old_v->y_pos, new_engine_type, 1, flags, CMD_BUILD_VEH(old_v->type));
+	cost = DoCommand(old_v->tile, new_engine_type, 1, flags, CMD_BUILD_VEH(old_v->type));
 	if (CmdFailed(cost)) return cost;
 
 	if (flags & DC_EXEC) {
@@ -1646,7 +1646,7 @@
 				// we add the refit cost to cost, so it's added to the cost animation
 				// it's not in the calculation of having enough money to actually do the replace since it's rather hard to do by design, but since
 				// we pay for it, it's nice to make the cost animation include it
-				int32 temp_cost = DoCommand(0, 0, new_v->index, old_v->cargo_type, DC_EXEC, CMD_REFIT_VEH(new_v->type));
+				int32 temp_cost = DoCommand(0, new_v->index, old_v->cargo_type, DC_EXEC, CMD_REFIT_VEH(new_v->type));
 				if (!CmdFailed(temp_cost)) cost += temp_cost;
 			}
 		}
@@ -1657,12 +1657,12 @@
 			 * We add the new engine after the old one instead of replacing it. It will give the same result anyway when we
 			 * sell the old engine in a moment
 			 */
-			DoCommand(0, 0, (GetPrevVehicleInChain(old_v)->index << 16) | new_v->index, 1, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
+			DoCommand(0, (GetPrevVehicleInChain(old_v)->index << 16) | new_v->index, 1, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
 			/* Now we move the old one out of the train */
-			DoCommand(0, 0, (INVALID_VEHICLE << 16) | old_v->index, 0, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
+			DoCommand(0, (INVALID_VEHICLE << 16) | old_v->index, 0, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
 		} else {
 			// copy/clone the orders
-			DoCommand(0, 0, (old_v->index << 16) | new_v->index, IsOrderListShared(old_v) ? CO_SHARE : CO_COPY, DC_EXEC, CMD_CLONE_ORDER);
+			DoCommand(0, (old_v->index << 16) | new_v->index, IsOrderListShared(old_v) ? CO_SHARE : CO_COPY, DC_EXEC, CMD_CLONE_ORDER);
 			new_v->cur_order_index = old_v->cur_order_index;
 			ChangeVehicleViewWindow(old_v, new_v);
 			new_v->profit_this_year = old_v->profit_this_year;
@@ -1680,7 +1680,7 @@
 				}
 
 				if (temp_v != NULL) {
-					DoCommand(0, 0, (new_v->index << 16) | temp_v->index, 1, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
+					DoCommand(0, (new_v->index << 16) | temp_v->index, 1, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
 				}
 			}
 		}
@@ -1696,7 +1696,7 @@
 	}
 
 	// sell the engine/ find out how much you get for the old engine
-	cost += DoCommand(0, 0, old_v->index, 0, flags, CMD_SELL_VEH(old_v->type));
+	cost += DoCommand(0, old_v->index, 0, flags, CMD_SELL_VEH(old_v->type));
 
 	if (new_front) {
 		// now we assign the old unitnumber to the new vehicle
@@ -1706,7 +1706,7 @@
 	// Transfer the name of the old vehicle.
 	if ((flags & DC_EXEC) && vehicle_name[0] != '\0') {
 		_cmd_text = vehicle_name;
-		DoCommand(0, 0, new_v->index, 0, DC_EXEC, CMD_NAME_VEHICLE);
+		DoCommand(0, new_v->index, 0, DC_EXEC, CMD_NAME_VEHICLE);
 	}
 
 	return cost;
@@ -1836,9 +1836,9 @@
 			}
 			temp = w;
 			w = GetNextVehicle(w);
-			DoCommand(0, 0, (INVALID_VEHICLE << 16) | temp->index, 0, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
+			DoCommand(0, (INVALID_VEHICLE << 16) | temp->index, 0, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
 			MoveVehicleCargo(v, temp);
-			cost += DoCommand(0, 0, temp->index, 0, flags, CMD_SELL_VEH(temp->type));
+			cost += DoCommand(0, temp->index, 0, flags, CMD_SELL_VEH(temp->type));
 		}
 	}
 
@@ -1850,11 +1850,11 @@
 
 
 /** Give a custom name to your vehicle
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID to name
  * @param p2 unused
  */
-int32 CmdNameVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdNameVehicle(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
 	StringID str;
@@ -1883,11 +1883,11 @@
 
 
 /** Change the service interval of a vehicle
- * @param x,y unused
+ * @param tile unused
  * @param p1 vehicle ID that is being service-interval-changed
  * @param p2 new service interval
  */
-int32 CmdChangeServiceInt(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdChangeServiceInt(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle* v;
 	uint16 serv_int = GetServiceIntervalClamped(p2); /* Double check the service interval from the user-input */
diff -r d53bc3e794bd -r 35d747bb5e82 water_cmd.c
--- a/water_cmd.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/water_cmd.c	Mon Apr 10 07:15:58 2006 +0000
@@ -42,13 +42,13 @@
 static void FloodVehicle(Vehicle *v);
 
 /** Build a ship depot.
- * @param x,y tile coordinates where ship depot is built
+ * @param tile tile where ship depot is built
  * @param p1 depot direction (0 == X or 1 == Y)
  * @param p2 unused
  */
-int32 CmdBuildShipDepot(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildShipDepot(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile, tile2;
+	TileIndex tile2;
 
 	int32 cost, ret;
 	Depot *depot;
@@ -57,7 +57,6 @@
 
 	if (p1 > 1) return CMD_ERROR;
 
-	tile = TileVirtXY(x, y);
 	if (!EnsureNoVehicle(tile)) return CMD_ERROR;
 
 	tile2 = tile + (p1 ? TileDiffXY(0, 1) : TileDiffXY(1, 0));
@@ -66,9 +65,9 @@
 	if (!IsClearWaterTile(tile) || !IsClearWaterTile(tile2))
 		return_cmd_error(STR_3801_MUST_BE_BUILT_ON_WATER);
 
-	ret = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(ret)) return CMD_ERROR;
-	ret = DoCommandByTile(tile2, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	ret = DoCommand(tile2, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(ret)) return CMD_ERROR;
 
 	// pretend that we're not making land from the water even though we actually are.
@@ -123,17 +122,17 @@
 	int delta;
 
 	// middle tile
-	ret = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(ret)) return CMD_ERROR;
 
 	delta = TileOffsByDir(dir);
 	// lower tile
-	ret = DoCommandByTile(tile - delta, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	ret = DoCommand(tile - delta, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(ret)) return CMD_ERROR;
 	if (GetTileSlope(tile - delta, NULL)) return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
 
 	// upper tile
-	ret = DoCommandByTile(tile + delta, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	ret = DoCommand(tile + delta, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 	if (CmdFailed(ret)) return CMD_ERROR;
 	if (GetTileSlope(tile + delta, NULL)) return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
 
@@ -173,13 +172,12 @@
 }
 
 /** Builds a lock (ship-lift)
- * @param x,y tile coordinates where to place the lock
+ * @param tile tile where to place the lock
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdBuildLock(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildLock(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
 	DiagDirection dir;
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
@@ -195,23 +193,24 @@
 }
 
 /** Build a piece of canal.
- * @param x,y end tile of stretch-dragging
+ * @param tile end tile of stretch-dragging
  * @param p1 start tile of stretch-dragging
  * @param p2 unused
  */
-int32 CmdBuildCanal(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildCanal(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	int32 cost;
 	int size_x, size_y;
+	int x;
+	int y;
 	int sx, sy;
 
 	if (p1 >= MapSize()) return CMD_ERROR;
 
+	x = TileX(tile);
+	y = TileY(tile);
 	sx = TileX(p1);
 	sy = TileY(p1);
-	/* x,y are in pixel-coordinates, transform to tile-coordinates
-	 * to be able to use the BEGIN_TILE_LOOP() macro */
-	x >>= 4; y >>= 4;
 
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
 
@@ -241,7 +240,7 @@
 			if (flags & DC_EXEC) SetWaterUnderBridge(tile);
 		} else {
 			/* no bridge, try to clear it. */
-			int32 ret = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+			int32 ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
 
 			if (CmdFailed(ret)) return ret;
 			cost += ret;
@@ -524,7 +523,7 @@
 			case MP_CLEAR:
 			case MP_TREES:
 				_current_player = OWNER_WATER;
-				if (!CmdFailed(DoCommandByTile(target, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR))) {
+				if (!CmdFailed(DoCommand(target, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR))) {
 					MakeShore(target);
 					MarkTileDirtyByTile(target);
 				}
@@ -557,7 +556,7 @@
 			if (v != NULL) FloodVehicle(v);
 		}
 
-		if (!CmdFailed(DoCommandByTile(target, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR))) {
+		if (!CmdFailed(DoCommand(target, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR))) {
 			MakeWater(target);
 			MarkTileDirtyByTile(target);
 		}
@@ -684,7 +683,7 @@
 	if (new_player != OWNER_SPECTATOR) {
 		SetTileOwner(tile, new_player);
 	} else {
-		DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+		DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 	}
 }
 
diff -r d53bc3e794bd -r 35d747bb5e82 waypoint.c
--- a/waypoint.c	Sun Apr 09 18:35:24 2006 +0000
+++ b/waypoint.c	Mon Apr 10 07:15:58 2006 +0000
@@ -163,16 +163,15 @@
 
 /** Convert existing rail to waypoint. Eg build a waypoint station over
  * piece of rail
- * @param x,y coordinates where waypoint will be built
+ * @param tile tile where waypoint will be built
  * @param p1 graphics for waypoint type, 0 indicates standard graphics
  * @param p2 unused
  *
  * @todo When checking for the tile slope,
  * distingush between "Flat land required" and "land sloped in wrong direction"
  */
-int32 CmdBuildTrainWaypoint(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdBuildTrainWaypoint(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
 	Waypoint *wp;
 	uint tileh;
 	Axis axis;
@@ -311,23 +310,22 @@
 }
 
 /** Delete a waypoint
- * @param x,y coordinates where waypoint is to be deleted
+ * @param tile tile where waypoint is to be deleted
  * @param p1 unused
  * @param p2 unused
  */
-int32 CmdRemoveTrainWaypoint(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRemoveTrainWaypoint(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
-	TileIndex tile = TileVirtXY(x, y);
 	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
 	return RemoveTrainWaypoint(tile, flags, true);
 }
 
 /** Rename a waypoint.
- * @param x,y unused
+ * @param tile unused
  * @param p1 id of waypoint
  * @param p2 unused
  */
-int32 CmdRenameWaypoint(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+int32 CmdRenameWaypoint(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Waypoint *wp;
 	StringID str;