--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/disaster_cmd.c	Tue Jan 02 19:19:48 2007 +0000
@@ -0,0 +1,1001 @@
+/* $Id$ */
+
+#include "stdafx.h"
+#include "openttd.h"
+#include "functions.h"
+#include "industry_map.h"
+#include "station_map.h"
+#include "table/strings.h"
+#include "map.h"
+#include "tile.h"
+#include "vehicle.h"
+#include "command.h"
+#include "news.h"
+#include "station.h"
+#include "waypoint.h"
+#include "town.h"
+#include "industry.h"
+#include "player.h"
+#include "airport.h"
+#include "sound.h"
+#include "variables.h"
+#include "table/sprites.h"
+#include "date.h"
+
+static void DisasterClearSquare(TileIndex tile)
+{
+	if (!EnsureNoVehicle(tile)) return;
+
+	switch (GetTileType(tile)) {
+		case MP_RAILWAY:
+			if (IsHumanPlayer(GetTileOwner(tile)) && !IsRailWaypoint(tile)) {
+				PlayerID p = _current_player;
+				_current_player = OWNER_WATER;
+				DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+				_current_player = p;
+			}
+			break;
+
+		case MP_HOUSE: {
+			PlayerID p = _current_player;
+			_current_player = OWNER_NONE;
+			DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+			_current_player = p;
+			break;
+		}
+
+		case MP_TREES:
+		case MP_CLEAR:
+			DoClearSquare(tile);
+			break;
+
+		default:
+			break;
+	}
+}
+
+static const SpriteID _disaster_images_1[] = {0xF41, 0xF41, 0xF41, 0xF41, 0xF41, 0xF41, 0xF41, 0xF41};
+static const SpriteID _disaster_images_2[] = {0xF44, 0xF44, 0xF44, 0xF44, 0xF44, 0xF44, 0xF44, 0xF44};
+static const SpriteID _disaster_images_3[] = {0xF4E, 0xF4E, 0xF4E, 0xF4E, 0xF4E, 0xF4E, 0xF4E, 0xF4E};
+static const SpriteID _disaster_images_4[] = {0xF46, 0xF46, 0xF47, 0xF47, 0xF48, 0xF48, 0xF49, 0xF49};
+static const SpriteID _disaster_images_5[] = {0xF4A, 0xF4A, 0xF4B, 0xF4B, 0xF4C, 0xF4C, 0xF4D, 0xF4D};
+static const SpriteID _disaster_images_6[] = {0xF50, 0xF50, 0xF50, 0xF50, 0xF50, 0xF50, 0xF50, 0xF50};
+static const SpriteID _disaster_images_7[] = {0xF51, 0xF51, 0xF51, 0xF51, 0xF51, 0xF51, 0xF51, 0xF51};
+static const SpriteID _disaster_images_8[] = {0xF52, 0xF52, 0xF52, 0xF52, 0xF52, 0xF52, 0xF52, 0xF52};
+static const SpriteID _disaster_images_9[] = {0xF3E, 0xF3E, 0xF3E, 0xF3E, 0xF3E, 0xF3E, 0xF3E, 0xF3E};
+
+static const SpriteID * const _disaster_images[] = {
+	_disaster_images_1, _disaster_images_1,
+	_disaster_images_2, _disaster_images_2,
+	_disaster_images_3, _disaster_images_3,
+	_disaster_images_8, _disaster_images_8, _disaster_images_9,
+	_disaster_images_6, _disaster_images_6,
+	_disaster_images_7, _disaster_images_7,
+	_disaster_images_4, _disaster_images_5,
+};
+
+static void DisasterVehicleUpdateImage(Vehicle *v)
+{
+	int img = v->u.disaster.image_override;
+	if (img == 0)
+		img = _disaster_images[v->subtype][v->direction];
+	v->cur_image = img;
+}
+
+static void InitializeDisasterVehicle(Vehicle* v, int x, int y, byte z, Direction direction, byte subtype)
+{
+	v->type = VEH_Disaster;
+	v->x_pos = x;
+	v->y_pos = y;
+	v->z_pos = z;
+	v->tile = TileVirtXY(x, y);
+	v->direction = direction;
+	v->subtype = subtype;
+	v->x_offs = -1;
+	v->y_offs = -1;
+	v->sprite_width = 2;
+	v->sprite_height = 2;
+	v->z_height = 5;
+	v->owner = OWNER_NONE;
+	v->vehstatus = VS_UNCLICKABLE;
+	v->u.disaster.image_override = 0;
+	v->current_order.type = OT_NOTHING;
+	v->current_order.flags = 0;
+	v->current_order.dest = 0;
+
+	DisasterVehicleUpdateImage(v);
+	VehiclePositionChanged(v);
+	BeginVehicleMove(v);
+	EndVehicleMove(v);
+}
+
+static void DeleteDisasterVeh(Vehicle *v)
+{
+	DeleteVehicleChain(v);
+}
+
+static void SetDisasterVehiclePos(Vehicle *v, int x, int y, byte z)
+{
+	Vehicle *u;
+
+	BeginVehicleMove(v);
+	v->x_pos = x;
+	v->y_pos = y;
+	v->z_pos = z;
+	v->tile = TileVirtXY(x, y);
+
+	DisasterVehicleUpdateImage(v);
+	VehiclePositionChanged(v);
+	EndVehicleMove(v);
+
+	if ( (u=v->next) != NULL) {
+		int safe_x = clamp(x, 0, MapMaxX() * TILE_SIZE);
+		int safe_y = clamp(y - 1, 0, MapMaxY() * TILE_SIZE);
+		BeginVehicleMove(u);
+
+		u->x_pos = x;
+		u->y_pos = y - 1 - (max(z - GetSlopeZ(safe_x, safe_y), 0) >> 3);
+		safe_y = clamp(u->y_pos, 0, MapMaxY() * TILE_SIZE);
+		u->z_pos = GetSlopeZ(safe_x, safe_y);
+		u->direction = v->direction;
+
+		DisasterVehicleUpdateImage(u);
+		VehiclePositionChanged(u);
+		EndVehicleMove(u);
+
+		if ( (u=u->next) != NULL) {
+			BeginVehicleMove(u);
+			u->x_pos = x;
+			u->y_pos = y;
+			u->z_pos = z + 5;
+			VehiclePositionChanged(u);
+			EndVehicleMove(u);
+		}
+	}
+}
+
+
+static void DisasterTick_Zeppeliner(Vehicle *v)
+{
+	GetNewVehiclePosResult gp;
+	Station *st;
+	int x,y;
+	byte z;
+	TileIndex tile;
+
+	++v->tick_counter;
+
+	if (v->current_order.dest < 2) {
+		if (v->tick_counter&1)
+			return;
+
+		GetNewVehiclePos(v, &gp);
+
+		SetDisasterVehiclePos(v, gp.x, gp.y, v->z_pos);
+
+		if (v->current_order.dest == 1) {
+			if (++v->age == 38) {
+				v->current_order.dest = 2;
+				v->age = 0;
+			}
+
+			if ((v->tick_counter&7)==0) {
+				CreateEffectVehicleRel(v, 0, -17, 2, EV_SMOKE);
+			}
+		} else if (v->current_order.dest == 0) {
+			tile = v->tile; /**/
+
+			if (IsValidTile(tile) &&
+					IsTileType(tile, MP_STATION) &&
+					IsAirport(tile) &&
+					IsHumanPlayer(GetTileOwner(tile))) {
+				v->current_order.dest = 1;
+				v->age = 0;
+
+				SetDParam(0, GetStationIndex(tile));
+				AddNewsItem(STR_B000_ZEPPELIN_DISASTER_AT,
+					NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_VEHICLE, NT_ACCIDENT, 0),
+					v->index,
+					0);
+			}
+		}
+		if (v->y_pos >= ((int)MapSizeY() + 9) * TILE_SIZE - 1)
+			DeleteDisasterVeh(v);
+		return;
+	}
+
+	if (v->current_order.dest > 2) {
+		if (++v->age <= 13320)
+			return;
+
+		tile = v->tile; /**/
+
+		if (IsValidTile(tile) &&
+				IsTileType(tile, MP_STATION) &&
+				IsAirport(tile) &&
+				IsHumanPlayer(GetTileOwner(tile))) {
+			st = GetStationByTile(tile);
+			CLRBITS(st->airport_flags, RUNWAY_IN_block);
+		}
+
+		SetDisasterVehiclePos(v, v->x_pos, v->y_pos, v->z_pos);
+		DeleteDisasterVeh(v);
+		return;
+	}
+
+	x = v->x_pos;
+	y = v->y_pos;
+	z = GetSlopeZ(x,y);
+	if (z < v->z_pos)
+		z = v->z_pos - 1;
+	SetDisasterVehiclePos(v, x, y, z);
+
+	if (++v->age == 1) {
+		CreateEffectVehicleRel(v, 0, 7, 8, EV_EXPLOSION_LARGE);
+		SndPlayVehicleFx(SND_12_EXPLOSION, v);
+		v->u.disaster.image_override = SPR_BLIMP_CRASHING;
+	} else if (v->age == 70) {
+		v->u.disaster.image_override = SPR_BLIMP_CRASHED;
+	} else if (v->age <= 300) {
+		if (!(v->tick_counter&7)) {
+			uint32 r = Random();
+
+			CreateEffectVehicleRel(v,
+				GB(r, 0, 4) - 7,
+				GB(r, 4, 4) - 7,
+				GB(r, 8, 3) + 5,
+				EV_EXPLOSION_SMALL);
+		}
+	} else if (v->age == 350) {
+		v->current_order.dest = 3;
+		v->age = 0;
+	}
+
+	tile = v->tile;/**/
+	if (IsValidTile(tile) &&
+			IsTileType(tile, MP_STATION) &&
+			IsAirport(tile) &&
+			IsHumanPlayer(GetTileOwner(tile))) {
+		st = GetStationByTile(tile);
+		SETBITS(st->airport_flags, RUNWAY_IN_block);
+	}
+}
+
+// UFO starts in the middle, and flies around a bit until it locates
+// a road vehicle which it targets.
+static void DisasterTick_UFO(Vehicle *v)
+{
+	GetNewVehiclePosResult gp;
+	Vehicle *u;
+	uint dist;
+	byte z;
+
+	v->u.disaster.image_override = (++v->tick_counter & 8) ? SPR_UFO_SMALL_SCOUT_DARKER : SPR_UFO_SMALL_SCOUT;
+
+	if (v->current_order.dest == 0) {
+// fly around randomly
+		int x = TileX(v->dest_tile) * TILE_SIZE;
+		int y = TileY(v->dest_tile) * TILE_SIZE;
+		if (abs(x - v->x_pos) + abs(y - v->y_pos) >= TILE_SIZE) {
+			v->direction = GetDirectionTowards(v, x, y);
+			GetNewVehiclePos(v, &gp);
+			SetDisasterVehiclePos(v, gp.x, gp.y, v->z_pos);
+			return;
+		}
+		if (++v->age < 6) {
+			v->dest_tile = RandomTile();
+			return;
+		}
+		v->current_order.dest = 1;
+
+		FOR_ALL_VEHICLES(u) {
+			if (u->type == VEH_Road && IsHumanPlayer(u->owner)) {
+				v->dest_tile = u->index;
+				v->age = 0;
+				return;
+			}
+		}
+
+		DeleteDisasterVeh(v);
+	} else {
+// target a vehicle
+		u = GetVehicle(v->dest_tile);
+		if (u->type != VEH_Road) {
+			DeleteDisasterVeh(v);
+			return;
+		}
+
+		dist = abs(v->x_pos - u->x_pos) + abs(v->y_pos - u->y_pos);
+
+		if (dist < TILE_SIZE && !(u->vehstatus&VS_HIDDEN) && u->breakdown_ctr==0) {
+			u->breakdown_ctr = 3;
+			u->breakdown_delay = 140;
+		}
+
+		v->direction = GetDirectionTowards(v, u->x_pos, u->y_pos);
+		GetNewVehiclePos(v, &gp);
+
+		z = v->z_pos;
+		if (dist <= TILE_SIZE && z > u->z_pos) z--;
+		SetDisasterVehiclePos(v, gp.x, gp.y, z);
+
+		if (z <= u->z_pos && (u->vehstatus&VS_HIDDEN)==0) {
+			v->age++;
+			if (u->u.road.crashed_ctr == 0) {
+				u->u.road.crashed_ctr++;
+				u->vehstatus |= VS_CRASHED;
+
+				AddNewsItem(STR_B001_ROAD_VEHICLE_DESTROYED,
+					NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_VEHICLE, NT_ACCIDENT, 0),
+					u->index,
+					0);
+			}
+		}
+
+// destroy?
+		if (v->age > 50) {
+			CreateEffectVehicleRel(v, 0, 7, 8, EV_EXPLOSION_LARGE);
+			SndPlayVehicleFx(SND_12_EXPLOSION, v);
+			DeleteDisasterVeh(v);
+		}
+	}
+}
+
+static void DestructIndustry(Industry *i)
+{
+	TileIndex tile;
+
+	for (tile = 0; tile != MapSize(); tile++) {
+		if (IsTileType(tile, MP_INDUSTRY) && GetIndustryIndex(tile) == i->index) {
+			ResetIndustryConstructionStage(tile);
+			MarkTileDirtyByTile(tile);
+		}
+	}
+}
+
+// Airplane which destroys an oil refinery
+static void DisasterTick_2(Vehicle *v)
+{
+	GetNewVehiclePosResult gp;
+
+	v->tick_counter++;
+	v->u.disaster.image_override =
+		(v->current_order.dest == 1 && v->tick_counter & 4) ? SPR_F_15_FIRING : 0;
+
+	GetNewVehiclePos(v, &gp);
+	SetDisasterVehiclePos(v, gp.x, gp.y, v->z_pos);
+
+	if (gp.x < -160) {
+		DeleteDisasterVeh(v);
+		return;
+	}
+
+	if (v->current_order.dest == 2) {
+		if (!(v->tick_counter&3)) {
+			Industry *i = GetIndustry(v->dest_tile);
+			int x = TileX(i->xy) * TILE_SIZE;
+			int y = TileY(i->xy) * TILE_SIZE;
+			uint32 r = Random();
+
+			CreateEffectVehicleAbove(
+				GB(r,  0, 6) + x,
+				GB(r,  6, 6) + y,
+				GB(r, 12, 4),
+				EV_EXPLOSION_SMALL);
+
+			if (++v->age >= 55)
+				v->current_order.dest = 3;
+		}
+	} else if (v->current_order.dest == 1) {
+		if (++v->age == 112) {
+			Industry *i;
+
+			v->current_order.dest = 2;
+			v->age = 0;
+
+			i = GetIndustry(v->dest_tile);
+			DestructIndustry(i);
+
+			SetDParam(0, i->town->index);
+			AddNewsItem(STR_B002_OIL_REFINERY_EXPLOSION, NEWS_FLAGS(NM_THIN,NF_VIEWPORT|NF_TILE,NT_ACCIDENT,0), i->xy, 0);
+			SndPlayTileFx(SND_12_EXPLOSION, i->xy);
+		}
+	} else if (v->current_order.dest == 0) {
+		int x,y;
+		TileIndex tile;
+		uint ind;
+
+		x = v->x_pos - 15 * TILE_SIZE;
+		y = v->y_pos;
+
+		if ( (uint)x > MapMaxX() * TILE_SIZE - 1)
+			return;
+
+		tile = TileVirtXY(x, y);
+		if (!IsTileType(tile, MP_INDUSTRY))
+			return;
+
+		ind = GetIndustryIndex(tile);
+		v->dest_tile = ind;
+
+		if (GetIndustry(ind)->type == IT_OIL_REFINERY) {
+			v->current_order.dest = 1;
+			v->age = 0;
+		}
+	}
+}
+
+// Helicopter which destroys a factory
+static void DisasterTick_3(Vehicle *v)
+{
+	GetNewVehiclePosResult gp;
+
+	v->tick_counter++;
+	v->u.disaster.image_override =
+		(v->current_order.dest == 1 && v->tick_counter & 4) ? SPR_AH_64A_FIRING : 0;
+
+	GetNewVehiclePos(v, &gp);
+	SetDisasterVehiclePos(v, gp.x, gp.y, v->z_pos);
+
+	if (gp.x > (int)MapSizeX() * TILE_SIZE + 9 * TILE_SIZE - 1) {
+		DeleteDisasterVeh(v);
+		return;
+	}
+
+	if (v->current_order.dest == 2) {
+		if (!(v->tick_counter&3)) {
+			Industry *i = GetIndustry(v->dest_tile);
+			int x = TileX(i->xy) * TILE_SIZE;
+			int y = TileY(i->xy) * TILE_SIZE;
+			uint32 r = Random();
+
+			CreateEffectVehicleAbove(
+				GB(r,  0, 6) + x,
+				GB(r,  6, 6) + y,
+				GB(r, 12, 4),
+				EV_EXPLOSION_SMALL);
+
+			if (++v->age >= 55)
+				v->current_order.dest = 3;
+		}
+	} else if (v->current_order.dest == 1) {
+		if (++v->age == 112) {
+			Industry *i;
+
+			v->current_order.dest = 2;
+			v->age = 0;
+
+			i = GetIndustry(v->dest_tile);
+			DestructIndustry(i);
+
+			SetDParam(0, i->town->index);
+			AddNewsItem(STR_B003_FACTORY_DESTROYED_IN_SUSPICIOUS, NEWS_FLAGS(NM_THIN,NF_VIEWPORT|NF_TILE,NT_ACCIDENT,0), i->xy, 0);
+			SndPlayTileFx(SND_12_EXPLOSION, i->xy);
+		}
+	} else if (v->current_order.dest == 0) {
+		int x,y;
+		TileIndex tile;
+		uint ind;
+
+		x = v->x_pos - 15 * TILE_SIZE;
+		y = v->y_pos;
+
+		if ( (uint)x > MapMaxX() * TILE_SIZE - 1)
+			return;
+
+		tile = TileVirtXY(x, y);
+		if (!IsTileType(tile, MP_INDUSTRY))
+			return;
+
+		ind = GetIndustryIndex(tile);
+		v->dest_tile = ind;
+
+		if (GetIndustry(ind)->type == IT_FACTORY) {
+			v->current_order.dest = 1;
+			v->age = 0;
+		}
+	}
+}
+
+// Helicopter rotor blades
+static void DisasterTick_3b(Vehicle *v)
+{
+	if (++v->tick_counter & 1)
+		return;
+
+	if (++v->cur_image > SPR_ROTOR_MOVING_3) v->cur_image = SPR_ROTOR_MOVING_1;
+
+	VehiclePositionChanged(v);
+	BeginVehicleMove(v);
+	EndVehicleMove(v);
+}
+
+// Big UFO which lands on a piece of rail.
+// Will be shot down by a plane
+static void DisasterTick_4(Vehicle *v)
+{
+	GetNewVehiclePosResult gp;
+	byte z;
+	Vehicle *u,*w;
+	Town *t;
+	TileIndex tile;
+	TileIndex tile_org;
+
+	v->tick_counter++;
+
+	if (v->current_order.dest == 1) {
+		int x = TileX(v->dest_tile) * TILE_SIZE + TILE_SIZE / 2;
+		int y = TileY(v->dest_tile) * TILE_SIZE + TILE_SIZE / 2;
+		if (abs(v->x_pos - x) + abs(v->y_pos - y) >= 8) {
+			v->direction = GetDirectionTowards(v, x, y);
+
+			GetNewVehiclePos(v, &gp);
+			SetDisasterVehiclePos(v, gp.x, gp.y, v->z_pos);
+			return;
+		}
+
+		z = GetSlopeZ(v->x_pos, v->y_pos);
+		if (z < v->z_pos) {
+			SetDisasterVehiclePos(v, v->x_pos, v->y_pos, v->z_pos - 1);
+			return;
+		}
+
+		v->current_order.dest = 2;
+
+		FOR_ALL_VEHICLES(u) {
+			if (u->type == VEH_Train || u->type == VEH_Road) {
+				if (abs(u->x_pos - v->x_pos) + abs(u->y_pos - v->y_pos) <= 12 * TILE_SIZE) {
+					u->breakdown_ctr = 5;
+					u->breakdown_delay = 0xF0;
+				}
+			}
+		}
+
+		t = ClosestTownFromTile(v->dest_tile, (uint)-1);
+		SetDParam(0, t->index);
+		AddNewsItem(STR_B004_UFO_LANDS_NEAR,
+			NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_TILE, NT_ACCIDENT, 0),
+			v->tile,
+			0);
+
+		u = ForceAllocateSpecialVehicle();
+		if (u == NULL) {
+			DeleteDisasterVeh(v);
+			return;
+		}
+
+		InitializeDisasterVehicle(u, -6 * TILE_SIZE, v->y_pos, 135, DIR_SW, 11);
+		u->u.disaster.unk2 = v->index;
+
+		w = ForceAllocateSpecialVehicle();
+		if (w == NULL)
+			return;
+
+		u->next = w;
+		InitializeDisasterVehicle(w, -6 * TILE_SIZE, v->y_pos, 0, DIR_SW, 12);
+		w->vehstatus |= VS_SHADOW;
+	} else if (v->current_order.dest < 1) {
+
+		int x = TileX(v->dest_tile) * TILE_SIZE;
+		int y = TileY(v->dest_tile) * TILE_SIZE;
+		if (abs(x - v->x_pos) + abs(y - v->y_pos) >= TILE_SIZE) {
+			v->direction = GetDirectionTowards(v, x, y);
+			GetNewVehiclePos(v, &gp);
+			SetDisasterVehiclePos(v, gp.x, gp.y, v->z_pos);
+			return;
+		}
+
+		if (++v->age < 6) {
+			v->dest_tile = RandomTile();
+			return;
+		}
+		v->current_order.dest = 1;
+
+		tile_org = tile = RandomTile();
+		do {
+			if (IsTileType(tile, MP_RAILWAY) &&
+					IsPlainRailTile(tile) &&
+					IsHumanPlayer(GetTileOwner(tile))) {
+				break;
+			}
+			tile = TILE_MASK(tile+1);
+		} while (tile != tile_org);
+		v->dest_tile = tile;
+		v->age = 0;
+	} else {
+		return;
+	}
+}
+
+// The plane which will shoot down the UFO
+static void DisasterTick_4b(Vehicle *v)
+{
+	GetNewVehiclePosResult gp;
+	Vehicle *u;
+	int i;
+
+	v->tick_counter++;
+
+	GetNewVehiclePos(v, &gp);
+	SetDisasterVehiclePos(v, gp.x, gp.y, v->z_pos);
+
+	if (gp.x > (int)MapSizeX() * TILE_SIZE + 9 * TILE_SIZE - 1) {
+		DeleteDisasterVeh(v);
+		return;
+	}
+
+	if (v->current_order.dest == 0) {
+		u = GetVehicle(v->u.disaster.unk2);
+		if (abs(v->x_pos - u->x_pos) > TILE_SIZE)
+			return;
+		v->current_order.dest = 1;
+
+		CreateEffectVehicleRel(u, 0, 7, 8, EV_EXPLOSION_LARGE);
+		SndPlayVehicleFx(SND_12_EXPLOSION, u);
+
+		DeleteDisasterVeh(u);
+
+		for (i = 0; i != 80; i++) {
+			uint32 r = Random();
+			CreateEffectVehicleAbove(
+				GB(r, 0, 6) + v->x_pos - 32,
+				GB(r, 5, 6) + v->y_pos - 32,
+				0,
+				EV_EXPLOSION_SMALL);
+		}
+
+		BEGIN_TILE_LOOP(tile, 6, 6, v->tile - TileDiffXY(3, 3))
+			tile = TILE_MASK(tile);
+			DisasterClearSquare(tile);
+		END_TILE_LOOP(tile, 6, 6, v->tile - TileDiffXY(3, 3))
+	}
+}
+
+// Submarine handler
+static void DisasterTick_5_and_6(Vehicle *v)
+{
+	uint32 r;
+	GetNewVehiclePosResult gp;
+	TileIndex tile;
+
+	v->tick_counter++;
+
+	if (++v->age > 8880) {
+		VehiclePositionChanged(v);
+		BeginVehicleMove(v);
+		EndVehicleMove(v);
+		DeleteVehicle(v);
+		return;
+	}
+
+	if (!(v->tick_counter & 1)) return;
+
+	tile = v->tile + TileOffsByDiagDir(DirToDiagDir(v->direction));
+	if (IsValidTile(tile) &&
+			(r=GetTileTrackStatus(tile,TRANSPORT_WATER),(byte)(r+(r >> 8)) == 0x3F) &&
+			!CHANCE16(1,90)) {
+		GetNewVehiclePos(v, &gp);
+		SetDisasterVehiclePos(v, gp.x, gp.y, v->z_pos);
+		return;
+	}
+
+	v->direction = ChangeDir(v->direction, GB(Random(), 0, 1) ? DIRDIFF_90RIGHT : DIRDIFF_90LEFT);
+}
+
+
+static void DisasterTick_NULL(Vehicle *v) {}
+typedef void DisasterVehicleTickProc(Vehicle *v);
+
+static DisasterVehicleTickProc * const _disastervehicle_tick_procs[] = {
+	DisasterTick_Zeppeliner,DisasterTick_NULL,
+	DisasterTick_UFO,DisasterTick_NULL,
+	DisasterTick_2,DisasterTick_NULL,
+	DisasterTick_3,DisasterTick_NULL,DisasterTick_3b,
+	DisasterTick_4,DisasterTick_NULL,
+	DisasterTick_4b,DisasterTick_NULL,
+	DisasterTick_5_and_6,
+	DisasterTick_5_and_6,
+};
+
+
+void DisasterVehicle_Tick(Vehicle *v)
+{
+	_disastervehicle_tick_procs[v->subtype](v);
+}
+
+
+void OnNewDay_DisasterVehicle(Vehicle *v)
+{
+	// not used
+}
+
+typedef void DisasterInitProc(void);
+
+// Zeppeliner which crashes on a small airport
+static void Disaster0_Init(void)
+{
+	Vehicle *v = ForceAllocateSpecialVehicle(), *u;
+	Station *st;
+	int x;
+
+	if (v == NULL) return;
+
+	/* Pick a random place, unless we find a small airport */
+	x = TileX(Random()) * TILE_SIZE + TILE_SIZE / 2;
+
+	FOR_ALL_STATIONS(st) {
+		if (st->airport_tile != 0 &&
+				st->airport_type <= 1 &&
+				IsHumanPlayer(st->owner)) {
+			x = (TileX(st->xy) + 2) * TILE_SIZE;
+			break;
+		}
+	}
+
+	InitializeDisasterVehicle(v, x, 0, 135, DIR_SE, 0);
+
+	// Allocate shadow too?
+	u = ForceAllocateSpecialVehicle();
+	if (u != NULL) {
+		v->next = u;
+		InitializeDisasterVehicle(u, x, 0, 0, DIR_SE, 1);
+		u->vehstatus |= VS_SHADOW;
+	}
+}
+
+static void Disaster1_Init(void)
+{
+	Vehicle *v = ForceAllocateSpecialVehicle(), *u;
+	int x;
+
+	if (v == NULL) return;
+
+	x = TileX(Random()) * TILE_SIZE + TILE_SIZE / 2;
+
+	InitializeDisasterVehicle(v, x, 0, 135, DIR_SE, 2);
+	v->dest_tile = TileXY(MapSizeX() / 2, MapSizeY() / 2);
+	v->age = 0;
+
+	// Allocate shadow too?
+	u = ForceAllocateSpecialVehicle();
+	if (u != NULL) {
+		v->next = u;
+		InitializeDisasterVehicle(u, x, 0, 0, DIR_SE, 3);
+		u->vehstatus |= VS_SHADOW;
+	}
+}
+
+static void Disaster2_Init(void)
+{
+	Industry *i, *found;
+	Vehicle *v,*u;
+	int x,y;
+
+	found = NULL;
+
+	FOR_ALL_INDUSTRIES(i) {
+		if (i->type == IT_OIL_REFINERY &&
+				(found == NULL || CHANCE16(1, 2))) {
+			found = i;
+		}
+	}
+
+	if (found == NULL) return;
+
+	v = ForceAllocateSpecialVehicle();
+	if (v == NULL) return;
+
+	x = (MapSizeX() + 9) * TILE_SIZE - 1;
+	y = TileY(found->xy) * TILE_SIZE + 37;
+
+	InitializeDisasterVehicle(v, x, y, 135, DIR_NE, 4);
+
+	u = ForceAllocateSpecialVehicle();
+	if (u != NULL) {
+		v->next = u;
+		InitializeDisasterVehicle(u, x, y, 0, DIR_SE, 5);
+		u->vehstatus |= VS_SHADOW;
+	}
+}
+
+static void Disaster3_Init(void)
+{
+	Industry *i, *found;
+	Vehicle *v,*u,*w;
+	int x,y;
+
+	found = NULL;
+
+	FOR_ALL_INDUSTRIES(i) {
+		if (i->type == IT_FACTORY &&
+				(found==NULL || CHANCE16(1,2))) {
+			found = i;
+		}
+	}
+
+	if (found == NULL) return;
+
+	v = ForceAllocateSpecialVehicle();
+	if (v == NULL) return;
+
+	x = -16 * TILE_SIZE;
+	y = TileY(found->xy) * TILE_SIZE + 37;
+
+	InitializeDisasterVehicle(v, x, y, 135, DIR_SW, 6);
+
+	u = ForceAllocateSpecialVehicle();
+	if (u != NULL) {
+		v->next = u;
+		InitializeDisasterVehicle(u, x, y, 0, DIR_SW, 7);
+		u->vehstatus |= VS_SHADOW;
+
+		w = ForceAllocateSpecialVehicle();
+		if (w != NULL) {
+			u->next = w;
+			InitializeDisasterVehicle(w, x, y, 140, DIR_SW, 8);
+		}
+	}
+}
+
+static void Disaster4_Init(void)
+{
+	Vehicle *v = ForceAllocateSpecialVehicle(), *u;
+	int x,y;
+
+	if (v == NULL) return;
+
+	x = TileX(Random()) * TILE_SIZE + TILE_SIZE / 2;
+
+	y = MapMaxX() * TILE_SIZE - 1;
+	InitializeDisasterVehicle(v, x, y, 135, DIR_NW, 9);
+	v->dest_tile = TileXY(MapSizeX() / 2, MapSizeY() / 2);
+	v->age = 0;
+
+	// Allocate shadow too?
+	u = ForceAllocateSpecialVehicle();
+	if (u != NULL) {
+		v->next = u;
+		InitializeDisasterVehicle(u, x, y, 0, DIR_NW, 10);
+		u->vehstatus |= VS_SHADOW;
+	}
+}
+
+// Submarine type 1
+static void Disaster5_Init(void)
+{
+	Vehicle *v = ForceAllocateSpecialVehicle();
+	int x,y;
+	Direction dir;
+	uint32 r;
+
+	if (v == NULL) return;
+
+	r = Random();
+	x = TileX(r) * TILE_SIZE + TILE_SIZE / 2;
+
+	if (r & 0x80000000) {
+		y = MapMaxX() * TILE_SIZE - TILE_SIZE / 2 - 1;
+		dir = DIR_NW;
+	} else {
+		y = TILE_SIZE / 2;
+		dir = DIR_SE;
+	}
+	InitializeDisasterVehicle(v, x, y, 0, dir, 13);
+	v->age = 0;
+}
+
+// Submarine type 2
+static void Disaster6_Init(void)
+{
+	Vehicle *v = ForceAllocateSpecialVehicle();
+	int x,y;
+	Direction dir;
+	uint32 r;
+
+	if (v == NULL) return;
+
+	r = Random();
+	x = TileX(r) * TILE_SIZE + TILE_SIZE / 2;
+
+	if (r & 0x80000000) {
+		y = MapMaxX() * TILE_SIZE - TILE_SIZE / 2 - 1;
+		dir = DIR_NW;
+	} else {
+		y = TILE_SIZE / 2;
+		dir = DIR_SE;
+	}
+	InitializeDisasterVehicle(v, x, y, 0, dir, 14);
+	v->age = 0;
+}
+
+static void Disaster7_Init(void)
+{
+	int index = GB(Random(), 0, 4);
+	uint m;
+
+	for (m = 0; m < 15; m++) {
+		const Industry* i;
+
+		FOR_ALL_INDUSTRIES(i) {
+			if (i->type == IT_COAL_MINE && --index < 0) {
+				SetDParam(0, i->town->index);
+				AddNewsItem(STR_B005_COAL_MINE_SUBSIDENCE_LEAVES,
+					NEWS_FLAGS(NM_THIN,NF_VIEWPORT|NF_TILE,NT_ACCIDENT,0), i->xy + TileDiffXY(1, 1), 0);
+
+				{
+					TileIndex tile = i->xy;
+					TileIndexDiff step = TileOffsByDiagDir(GB(Random(), 0, 2));
+					uint n;
+
+					for (n = 0; n < 30; n++) {
+						DisasterClearSquare(tile);
+						tile = TILE_MASK(tile + step);
+					}
+				}
+				return;
+			}
+		}
+	}
+}
+
+static DisasterInitProc * const _disaster_initprocs[] = {
+	Disaster0_Init,
+	Disaster1_Init,
+	Disaster2_Init,
+	Disaster3_Init,
+	Disaster4_Init,
+	Disaster5_Init,
+	Disaster6_Init,
+	Disaster7_Init,
+};
+
+static const struct {
+	Year min;
+	Year max;
+} _dis_years[] = {
+	{ 1930, 1955 },
+	{ 1940, 1970 },
+	{ 1960, 1990 },
+	{ 1970, 2000 },
+	{ 2000, 2100 },
+	{ 1940, 1965 },
+	{ 1975, 2010 },
+	{ 1950, 1985 }
+};
+
+
+static void DoDisaster(void)
+{
+	byte buf[lengthof(_dis_years)];
+	uint i;
+	uint j;
+
+	j = 0;
+	for (i = 0; i != lengthof(_dis_years); i++) {
+		if (_cur_year >= _dis_years[i].min && _cur_year < _dis_years[i].max) buf[j++] = i;
+	}
+
+	if (j == 0) return;
+
+	_disaster_initprocs[buf[RandomRange(j)]]();
+}
+
+
+static void ResetDisasterDelay(void)
+{
+	_disaster_delay = GB(Random(), 0, 9) + 730;
+}
+
+void DisasterDailyLoop(void)
+{
+	if (--_disaster_delay != 0) return;
+
+	ResetDisasterDelay();
+
+	if (_opt.diff.disasters != 0) DoDisaster();
+}
+
+void StartupDisasters(void)
+{
+	ResetDisasterDelay();
+}