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/* $Id$ */

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     3

/** @file clear_cmd.cpp */

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#include "stdafx.h"

     6

#include "openttd.h"

     7

#include "clear_map.h"

     8

#include "rail_map.h"

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#include "table/strings.h"

    10

#include "functions.h"

    11

#include "map.h"

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#include "player.h"

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#include "tile.h"

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#include "viewport.h"

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#include "command.h"

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#include "tunnel_map.h"

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#include "bridge_map.h"

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#include "bridge.h"

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#include "landscape.h"

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#include "variables.h"

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#include "table/sprites.h"

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#include "unmovable_map.h"

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#include "genworld.h"

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#include "industry.h"

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    26

struct TerraformerHeightMod {

    27

	TileIndex tile;

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	byte height;

    29

};

    30

    31

struct TerraformerState {

    32

	int height[4];

    33

	uint32 flags;

    34

    35

	int direction;

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	int modheight_count;

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	int tile_table_count;

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    39

	CommandCost cost;

    40

    41

	TileIndex *tile_table;

    42

	TerraformerHeightMod *modheight;

    43

    44

};

    45

    46

static int TerraformAllowTileProcess(TerraformerState *ts, TileIndex tile)

    47

{

    48

	TileIndex *t;

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	int count;

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    51

	if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) return -1;

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    53

	t = ts->tile_table;

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	for (count = ts->tile_table_count; count != 0; count--, t++) {

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		if (*t == tile) return 0;

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	}

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    58

	return 1;

    59

}

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    61

static int TerraformGetHeightOfTile(TerraformerState *ts, TileIndex tile)

    62

{

    63

	TerraformerHeightMod *mod = ts->modheight;

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	int count;

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    66

	for (count = ts->modheight_count; count != 0; count--, mod++) {

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		if (mod->tile == tile) return mod->height;

    68

	}

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    70

	return TileHeight(tile);

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}

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    73

static void TerraformAddDirtyTile(TerraformerState *ts, TileIndex tile)

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{

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	int count;

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	TileIndex *t;

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    78

	count = ts->tile_table_count;

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    80

	if (count >= 625) return;

    81

    82

	for (t = ts->tile_table; count != 0; count--, t++) {

    83

		if (*t == tile) return;

    84

	}

    85

    86

	ts->tile_table[ts->tile_table_count++] = tile;

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}

    88

    89

static void TerraformAddDirtyTileAround(TerraformerState *ts, TileIndex tile)

    90

{

    91

	TerraformAddDirtyTile(ts, tile + TileDiffXY( 0, -1));

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	TerraformAddDirtyTile(ts, tile + TileDiffXY(-1, -1));

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	TerraformAddDirtyTile(ts, tile + TileDiffXY(-1,  0));

    94

	TerraformAddDirtyTile(ts, tile);

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}

    96

    97

static int TerraformProc(TerraformerState *ts, TileIndex tile, int mode)

    98

{

    99

	int r;

   100

	CommandCost ret;

   101

   102

	assert(tile < MapSize());

   103

   104

	r = TerraformAllowTileProcess(ts, tile);

   105

	if (r <= 0) return r;

   106

   107

	if (IsTileType(tile, MP_RAILWAY)) {

   108

		static const TrackBits safe_track[] = { TRACK_BIT_LOWER, TRACK_BIT_LEFT, TRACK_BIT_UPPER, TRACK_BIT_RIGHT };

   109

		static const Slope unsafe_slope[] = { SLOPE_S, SLOPE_W, SLOPE_N, SLOPE_E };

   110

   111

		Slope tileh;

   112

		uint z;

   113

   114

		/* Nothing could be built at the steep slope - this avoids a bug

   115

		 * when you have a single diagonal track in one corner on a

   116

		 * basement and then you raise/lower the other corner. */

   117

		tileh = GetTileSlope(tile, &z);

   118

		if (tileh == unsafe_slope[mode] ||

   119

				tileh == ComplementSlope(unsafe_slope[mode])) {

   120

			_terraform_err_tile = tile;

   121

			_error_message = STR_1008_MUST_REMOVE_RAILROAD_TRACK;

   122

			return -1;

   123

		}

   124

   125

		/* If we have a single diagonal track there, the other side of

   126

		 * tile can be terraformed. */

   127

		if (IsPlainRailTile(tile) && GetTrackBits(tile) == safe_track[mode]) {

   128

			/* If terraforming downwards prevent damaging a potential tunnel below.

   129

			 * This check is only necessary for flat tiles, because if the tile is

   130

			 * non-flat, then the corner opposing the rail is raised. Only this corner

   131

			 * can be lowered and this is a safe action

   132

			 */

   133

			if (tileh == SLOPE_FLAT &&

   134

					ts->direction == -1 &&

   135

					IsTunnelInWay(tile, z - TILE_HEIGHT)) {

   136

				_terraform_err_tile = tile;

   137

				_error_message = STR_1002_EXCAVATION_WOULD_DAMAGE;

   138

				return -1;

   139

			}

   140

			return 0;

   141

		}

   142

	}

   143

   144

	ret = DoCommand(tile, 0, 0, ts->flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);

   145

   146

	if (CmdFailed(ret)) {

   147

		_terraform_err_tile = tile;

   148

		return -1;

   149

	}

   150

   151

	ts->cost.AddCost(ret.GetCost());

   152

   153

	if (ts->tile_table_count >= 625) return -1;

   154

	ts->tile_table[ts->tile_table_count++] = tile;

   155

   156

	return 0;

   157

}

   158

   159

static bool TerraformTileHeight(TerraformerState *ts, TileIndex tile, int height)

   160

{

   161

	int nh;

   162

	TerraformerHeightMod *mod;

   163

	int count;

   164

   165

	assert(tile < MapSize());

   166

   167

	if (height < 0) {

   168

		_error_message = STR_1003_ALREADY_AT_SEA_LEVEL;

   169

		return false;

   170

	}

   171

   172

	_error_message = STR_1004_TOO_HIGH;

   173

   174

	if (height > 15) return false;

   175

   176

	nh = TerraformGetHeightOfTile(ts, tile);

   177

	if (nh < 0 || height == nh) return false;

   178

   179

	if (TerraformProc(ts, tile, 0) < 0) return false;

   180

	if (TerraformProc(ts, tile + TileDiffXY( 0, -1), 1) < 0) return false;

   181

	if (TerraformProc(ts, tile + TileDiffXY(-1, -1), 2) < 0) return false;

   182

	if (TerraformProc(ts, tile + TileDiffXY(-1,  0), 3) < 0) return false;

   183

   184

	mod = ts->modheight;

   185

	count = ts->modheight_count;

   186

   187

	for (;;) {

   188

		if (count == 0) {

   189

			if (ts->modheight_count >= 576) return false;

   190

			ts->modheight_count++;

   191

			break;

   192

		}

   193

		if (mod->tile == tile) break;

   194

		mod++;

   195

		count--;

   196

	}

   197

   198

	mod->tile = tile;

   199

	mod->height = (byte)height;

   200

   201

	ts->cost.AddCost(_price.terraform);

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   203

	{

   204

		int direction = ts->direction, r;

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		const TileIndexDiffC *ttm;

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   207

		static const TileIndexDiffC _terraform_tilepos[] = {

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			{ 1,  0},

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			{-2,  0},

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			{ 1,  1},

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			{ 0, -2}

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		};

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   214

		for (ttm = _terraform_tilepos; ttm != endof(_terraform_tilepos); ttm++) {

   215

			tile += ToTileIndexDiff(*ttm);

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   217

			r = TerraformGetHeightOfTile(ts, tile);

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			if (r != height && r - direction != height && r + direction != height) {

   219

				if (!TerraformTileHeight(ts, tile, r + direction))

   220

					return false;

   221

			}

   222

		}

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	}

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   225

	return true;

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}

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   228

/** Terraform land

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 * @param tile tile to terraform

   230

 * @param flags for this command type

   231

 * @param p1 corners to terraform.

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 * @param p2 direction; eg up or down

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 * @return error or cost of terraforming

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 */

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CommandCost CmdTerraformLand(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

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{

   237

	TerraformerState ts;

   238

	TileIndex t;

   239

	int direction;

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   241

	TerraformerHeightMod modheight_data[576];

   242

	TileIndex tile_table_data[625];

   243

   244

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   245

   246

	_terraform_err_tile = 0;

   247

   248

	ts.direction = direction = p2 ? 1 : -1;

   249

	ts.flags = flags;

   250

	ts.modheight_count = ts.tile_table_count = 0;

   251

	ts.cost = CommandCost();

   252

	ts.modheight = modheight_data;

   253

	ts.tile_table = tile_table_data;

   254

   255

	/* Make an extra check for map-bounds cause we add tiles to the originating tile */

   256

	if (tile + TileDiffXY(1, 1) >= MapSize()) return CMD_ERROR;

   257

   258

	if (p1 & 1) {

   259

		t = tile + TileDiffXY(1, 0);

   260

		if (!TerraformTileHeight(&ts, t, TileHeight(t) + direction)) {

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			return CMD_ERROR;

   262

		}

   263

	}

   264

   265

	if (p1 & 2) {

   266

		t = tile + TileDiffXY(1, 1);

   267

		if (!TerraformTileHeight(&ts, t, TileHeight(t) + direction)) {

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			return CMD_ERROR;

   269

		}

   270

	}

   271

   272

	if (p1 & 4) {

   273

		t = tile + TileDiffXY(0, 1);

   274

		if (!TerraformTileHeight(&ts, t, TileHeight(t) + direction)) {

   275

			return CMD_ERROR;

   276

		}

   277

	}

   278

   279

	if (p1 & 8) {

   280

		t = tile + TileDiffXY(0, 0);

   281

		if (!TerraformTileHeight(&ts, t, TileHeight(t) + direction)) {

   282

			return CMD_ERROR;

   283

		}

   284

	}

   285

   286

	{

   287

		/* Check if tunnel would take damage */

   288

		int count;

   289

		TileIndex *ti = ts.tile_table;

   290

   291

		for (count = ts.tile_table_count; count != 0; count--, ti++) {

   292

			TileIndex tile = *ti;

   293

   294

			uint z_min = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(0, 0));

   295

			uint z_max = z_min;

   296

			uint t = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(1, 0));

   297

			z_min = min(z_min, t);

   298

			z_max = max(z_max, t);

   299

			t = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(1, 1));

   300

			z_min = min(z_min, t);

   301

			z_max = max(z_max, t);

   302

			t = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(0, 1));

   303

			z_min = min(z_min, t);

   304

			z_max = max(z_max, t);

   305

   306

			if (direction == 1 && MayHaveBridgeAbove(tile) && IsBridgeAbove(tile) &&

   307

					GetBridgeHeight(GetSouthernBridgeEnd(tile)) <= z_max * TILE_HEIGHT) {

   308

				return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   309

			}

   310

			if (direction == -1 && IsTunnelInWay(tile, z_min * TILE_HEIGHT)) {

   311

				return_cmd_error(STR_1002_EXCAVATION_WOULD_DAMAGE);

   312

			}

   313

		}

   314

	}

   315

   316

	if (flags & DC_EXEC) {

   317

		/* Clear the landscape at the tiles */

   318

		{

   319

			int count;

   320

			TileIndex *ti = ts.tile_table;

   321

			for (count = ts.tile_table_count; count != 0; count--, ti++) {

   322

				DoCommand(*ti, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   323

			}

   324

		}

   325

   326

		/* change the height */

   327

		{

   328

			int count;

   329

			TerraformerHeightMod *mod;

   330

   331

			mod = ts.modheight;

   332

			for (count = ts.modheight_count; count != 0; count--, mod++) {

   333

				TileIndex til = mod->tile;

   334

   335

				SetTileHeight(til, mod->height);

   336

				TerraformAddDirtyTileAround(&ts, til);

   337

			}

   338

		}

   339

   340

		/* finally mark the dirty tiles dirty */

   341

		{

   342

			int count;

   343

			TileIndex *ti = ts.tile_table;

   344

			for (count = ts.tile_table_count; count != 0; count--, ti++) {

   345

				MarkTileDirtyByTile(*ti);

   346

			}

   347

		}

   348

	}

   349

	return ts.cost;

   350

}

   351

   352

   353

/** Levels a selected (rectangle) area of land

   354

 * @param tile end tile of area-drag

   355

 * @param flags for this command type

   356

 * @param p1 start tile of area drag

   357

 * @param p2 unused

   358

 * @return  error or cost of terraforming

   359

 */

   360

CommandCost CmdLevelLand(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

   361

{

   362

	int size_x, size_y;

   363

	int ex;

   364

	int ey;

   365

	int sx, sy;

   366

	uint h, curh;

   367

	CommandCost money;

   368

	CommandCost ret;

   369

	CommandCost cost;

   370

   371

	if (p1 >= MapSize()) return CMD_ERROR;

   372

   373

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   374

   375

	/* remember level height */

   376

	h = TileHeight(p1);

   377

   378

	/* make sure sx,sy are smaller than ex,ey */

   379

	ex = TileX(tile);

   380

	ey = TileY(tile);

   381

	sx = TileX(p1);

   382

	sy = TileY(p1);

   383

	if (ex < sx) Swap(ex, sx);

   384

	if (ey < sy) Swap(ey, sy);

   385

	tile = TileXY(sx, sy);

   386

   387

	size_x = ex - sx + 1;

   388

	size_y = ey - sy + 1;

   389

   390

	money.AddCost(GetAvailableMoneyForCommand());

   391

   392

	BEGIN_TILE_LOOP(tile2, size_x, size_y, tile) {

   393

		curh = TileHeight(tile2);

   394

		while (curh != h) {

   395

			ret = DoCommand(tile2, 8, (curh > h) ? 0 : 1, flags & ~DC_EXEC, CMD_TERRAFORM_LAND);

   396

			if (CmdFailed(ret)) break;

   397

   398

			if (flags & DC_EXEC) {

   399

				money.AddCost(-ret.GetCost());

   400

				if (money.GetCost() < 0) {

   401

					_additional_cash_required = ret.GetCost();

   402

					return cost;

   403

				}

   404

				DoCommand(tile2, 8, (curh > h) ? 0 : 1, flags, CMD_TERRAFORM_LAND);

   405

			}

   406

   407

			cost.AddCost(ret);

   408

			curh += (curh > h) ? -1 : 1;

   409

		}

   410

	} END_TILE_LOOP(tile2, size_x, size_y, tile)

   411

   412

	return (cost.GetCost() == 0) ? CMD_ERROR : cost;

   413

}

   414

   415

/** Purchase a land area. Actually you only purchase one tile, so

   416

 * the name is a bit confusing ;p

   417

 * @param tile the tile the player is purchasing

   418

 * @param flags for this command type

   419

 * @param p1 unused

   420

 * @param p2 unused

   421

 * @return error of cost of operation

   422

 */

   423

CommandCost CmdPurchaseLandArea(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

   424

{

   425

	CommandCost cost;

   426

   427

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   428

   429

	if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   430

   431

	if (IsOwnedLandTile(tile) && IsTileOwner(tile, _current_player)) {

   432

		return_cmd_error(STR_5807_YOU_ALREADY_OWN_IT);

   433

	}

   434

   435

	cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   436

	if (CmdFailed(cost)) return CMD_ERROR;

   437

   438

	if (flags & DC_EXEC) {

   439

		MakeOwnedLand(tile, _current_player);

   440

		MarkTileDirtyByTile(tile);

   441

	}

   442

   443

	return cost.AddCost(_price.purchase_land * 10);

   444

}

   445

   446

   447

static CommandCost ClearTile_Clear(TileIndex tile, byte flags)

   448

{

   450

		&_price.clear_1,

   451

		&_price.purchase_land,

   452

		&_price.clear_2,

   453

		&_price.clear_3,

   454

		&_price.purchase_land,

   455

		&_price.purchase_land,

   456

		&_price.clear_2, // XXX unused?

   457

	};

   458

	CommandCost price;

   459

   460

	if (!IsClearGround(tile, CLEAR_GRASS) || GetClearDensity(tile) != 0) {

   461

		price.AddCost(*clear_price_table[GetClearGround(tile)]);

   462

	}

   463

   464

	if (flags & DC_EXEC) DoClearSquare(tile);

   465

   466

	return price;

   467

}

   468

   469

/** Sell a land area. Actually you only sell one tile, so

   470

 * the name is a bit confusing ;p

   471

 * @param tile the tile the player is selling

   472

 * @param flags for this command type

   473

 * @param p1 unused

   474

 * @param p2 unused

   475

 * @return error or cost of operation

   476

 */

   477

CommandCost CmdSellLandArea(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

   478

{

   479

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   480

   481

	if (!IsOwnedLandTile(tile)) return CMD_ERROR;

   482

	if (!CheckTileOwnership(tile) && _current_player != OWNER_WATER) return CMD_ERROR;

   483

   484

   485

	if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   486

   487

	if (flags & DC_EXEC) DoClearSquare(tile);

   488

   489

	return CommandCost(- _price.purchase_land * 2);

   490

}

   491

   492

   493

#include "table/clear_land.h"

   494