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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"

     9

#include "table/strings.h"

    10

#include "functions.h"

    11

#include "map.h"

    12

#include "player.h"

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#include "tile.h"

    14

#include "viewport.h"

    15

#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"

    26

    27

struct TerraformerHeightMod {

    28

	TileIndex tile;

    29

	byte height;

    30

};

    31

    32

struct TerraformerState {

    33

	int height[4];

    34

	uint32 flags;

    35

    36

	int direction;

    37

	int modheight_count;

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	int tile_table_count;

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    40

	CommandCost cost;

    41

    42

	TileIndex *tile_table;

    43

	TerraformerHeightMod *modheight;

    44

    45

};

    46

    47

static int TerraformAllowTileProcess(TerraformerState *ts, TileIndex tile)

    48

{

    49

	TileIndex *t;

    50

	int count;

    51

    52

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

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    54

	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;

    57

	}

    58

    59

	return 1;

    60

}

    61

    62

static int TerraformGetHeightOfTile(TerraformerState *ts, TileIndex tile)

    63

{

    64

	TerraformerHeightMod *mod = ts->modheight;

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	int count;

    66

    67

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

    68

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

    69

	}

    70

    71

	return TileHeight(tile);

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}

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    74

static void TerraformAddDirtyTile(TerraformerState *ts, TileIndex tile)

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{

    76

	int count;

    77

	TileIndex *t;

    78

    79

	count = ts->tile_table_count;

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    81

	if (count >= 625) return;

    82

    83

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

    84

		if (*t == tile) return;

    85

	}

    86

    87

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

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}

    89

    90

static void TerraformAddDirtyTileAround(TerraformerState *ts, TileIndex tile)

    91

{

    92

	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));

    95

	TerraformAddDirtyTile(ts, tile);

    96

}

    97

    98

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

    99

{

   100

	int r;

   101

	CommandCost ret;

   102

   103

	assert(tile < MapSize());

   104

   105

	r = TerraformAllowTileProcess(ts, tile);

   106

	if (r <= 0) return r;

   107

   108

	if (IsTileType(tile, MP_RAILWAY)) {

   109

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

   110

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

   111

   112

		Slope tileh;

   113

		uint z;

   114

   115

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

   116

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

   117

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

   118

		tileh = GetTileSlope(tile, &z);

   119

		if (tileh == unsafe_slope[mode] ||

   120

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

   121

			_terraform_err_tile = tile;

   122

			_error_message = STR_1008_MUST_REMOVE_RAILROAD_TRACK;

   123

			return -1;

   124

		}

   125

   126

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

   127

		 * tile can be terraformed. */

   128

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

   129

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

   130

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

   131

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

   132

			 * can be lowered and this is a safe action

   133

			 */

   134

			if (tileh == SLOPE_FLAT &&

   135

					ts->direction == -1 &&

   136

					IsTunnelInWay(tile, z - TILE_HEIGHT)) {

   137

				_terraform_err_tile = tile;

   138

				_error_message = STR_1002_EXCAVATION_WOULD_DAMAGE;

   139

				return -1;

   140

			}

   141

			return 0;

   142

		}

   143

	}

   144

   152

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

   153

   154

	if (CmdFailed(ret)) {

   155

		_terraform_err_tile = tile;

   156

		return -1;

   157

	}

   158

   159

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

   160

   161

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

   162

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

   163

   164

	return 0;

   165

}

   166

   167

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

   168

{

   169

	int nh;

   170

	TerraformerHeightMod *mod;

   171

	int count;

   172

   173

	assert(tile < MapSize());

   174

   175

	if (height < 0) {

   176

		_error_message = STR_1003_ALREADY_AT_SEA_LEVEL;

   177

		return false;

   178

	}

   179

   180

	_error_message = STR_1004_TOO_HIGH;

   181

   182

	if (height > 15) return false;

   183

   184

	nh = TerraformGetHeightOfTile(ts, tile);

   185

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

   186

   187

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

   188

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

   189

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

   190

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

   191

   192

	mod = ts->modheight;

   193

	count = ts->modheight_count;

   194

   195

	for (;;) {

   196

		if (count == 0) {

   197

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

   198

			ts->modheight_count++;

   199

			break;

   200

		}

   201

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

   202

		mod++;

   203

		count--;

   204

	}

   205

   206

	mod->tile = tile;

   207

	mod->height = (byte)height;

   208

   209

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

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   211

	{

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		int direction = ts->direction, r;

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		const TileIndexDiffC *ttm;

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   215

		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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   222

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

   223

			tile += ToTileIndexDiff(*ttm);

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   225

			r = TerraformGetHeightOfTile(ts, tile);

   226

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

   227

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

   228

					return false;

   229

			}

   230

		}

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	}

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   233

	return true;

   234

}

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   236

/** Terraform land

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 * @param tile tile to terraform

   238

 * @param flags for this command type

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 * @param p1 corners to terraform.

   240

 * @param p2 direction; eg up or down

   241

 * @return error or cost of terraforming

   242

 */

   243

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

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{

   245

	TerraformerState ts;

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	TileIndex t;

   247

	int direction;

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   249

	TerraformerHeightMod modheight_data[576];

   250

	TileIndex tile_table_data[625];

   251

   252

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

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   254

	_terraform_err_tile = 0;

   255

   256

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

   257

	ts.flags = flags;

   258

	ts.modheight_count = ts.tile_table_count = 0;

   259

	ts.cost = CommandCost();

   260

	ts.modheight = modheight_data;

   261

	ts.tile_table = tile_table_data;

   262

   263

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

   264

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

   265

   266

	if (p1 & 1) {

   267

		t = tile + TileDiffXY(1, 0);

   268

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

   269

			return CMD_ERROR;

   270

		}

   271

	}

   272

   273

	if (p1 & 2) {

   274

		t = tile + TileDiffXY(1, 1);

   275

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

   276

			return CMD_ERROR;

   277

		}

   278

	}

   279

   280

	if (p1 & 4) {

   281

		t = tile + TileDiffXY(0, 1);

   282

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

   283

			return CMD_ERROR;

   284

		}

   285

	}

   286

   287

	if (p1 & 8) {

   288

		t = tile + TileDiffXY(0, 0);

   289

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

   290

			return CMD_ERROR;

   291

		}

   292

	}

   293

   294

	{

   295

		/* Check if tunnel would take damage */

   296

		int count;

   297

		TileIndex *ti = ts.tile_table;

   298

   299

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

   300

			TileIndex tile = *ti;

   301

   302

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

   303

			uint z_max = z_min;

   304

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

   305

			z_min = min(z_min, t);

   306

			z_max = max(z_max, t);

   307

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

   308

			z_min = min(z_min, t);

   309

			z_max = max(z_max, t);

   310

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

   311

			z_min = min(z_min, t);

   312

			z_max = max(z_max, t);

   313

   314

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

   315

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

   316

				return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   317

			}

   318

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

   319

				return_cmd_error(STR_1002_EXCAVATION_WOULD_DAMAGE);

   320

			}

   321

		}

   322

	}

   323

   324

	if (flags & DC_EXEC) {

   325

		/* Clear the landscape at the tiles */

   326

		{

   327

			int count;

   328

			TileIndex *ti = ts.tile_table;

   329

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

   330

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

   331

			}

   332

		}

   333

   334

		/* change the height */

   335

		{

   336

			int count;

   337

			TerraformerHeightMod *mod;

   338

   339

			mod = ts.modheight;

   340

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

   341

				TileIndex til = mod->tile;

   342

   343

				SetTileHeight(til, mod->height);

   344

				TerraformAddDirtyTileAround(&ts, til);

   345

			}

   346

		}

   347

   348

		/* finally mark the dirty tiles dirty */

   349

		{

   350

			int count;

   351

			TileIndex *ti = ts.tile_table;

   352

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

   353

				MarkTileDirtyByTile(*ti);

   354

			}

   355

		}

   356

	}

   357

	return ts.cost;

   358

}

   359

   360

   361

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

   362

 * @param tile end tile of area-drag

   363

 * @param flags for this command type

   364

 * @param p1 start tile of area drag

   365

 * @param p2 unused

   366

 * @return  error or cost of terraforming

   367

 */

   368

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

   369

{

   370

	int size_x, size_y;

   371

	int ex;

   372

	int ey;

   373

	int sx, sy;

   374

	uint h, curh;

   375

	CommandCost money;

   376

	CommandCost ret;

   377

	CommandCost cost;

   378

   379

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

   380

   381

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   382

   383

	/* remember level height */

   384

	h = TileHeight(p1);

   385

   386

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

   387

	ex = TileX(tile);

   388

	ey = TileY(tile);

   389

	sx = TileX(p1);

   390

	sy = TileY(p1);

   391

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

   392

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

   393

	tile = TileXY(sx, sy);

   394

   395

	size_x = ex - sx + 1;

   396

	size_y = ey - sy + 1;

   397

   398

	money.AddCost(GetAvailableMoneyForCommand());

   399

   400

	BEGIN_TILE_LOOP(tile2, size_x, size_y, tile) {

   401

		curh = TileHeight(tile2);

   402

		while (curh != h) {

   403

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

   404

			if (CmdFailed(ret)) break;

   405

   406

			if (flags & DC_EXEC) {

   407

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

   408

				if (money.GetCost() < 0) {

   409

					_additional_cash_required = ret.GetCost();

   410

					return cost;

   411

				}

   412

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

   413

			}

   414

   415

			cost.AddCost(ret);

   416

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

   417

		}

   418

	} END_TILE_LOOP(tile2, size_x, size_y, tile)

   419

   420

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

   421

}

   422

   423

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

   424

 * the name is a bit confusing ;p

   425

 * @param tile the tile the player is purchasing

   426

 * @param flags for this command type

   427

 * @param p1 unused

   428

 * @param p2 unused

   429

 * @return error of cost of operation

   430

 */

   431

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

   432

{

   433

	CommandCost cost;

   434

   435

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   436

   437

	if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   438

   439

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

   440

		return_cmd_error(STR_5807_YOU_ALREADY_OWN_IT);

   441

	}

   442

   443

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

   444

	if (CmdFailed(cost)) return CMD_ERROR;

   445

   446

	if (flags & DC_EXEC) {

   447

		MakeOwnedLand(tile, _current_player);

   448

		MarkTileDirtyByTile(tile);

   449

	}

   450

   451

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

   452

}

   453

   454

   455

static CommandCost ClearTile_Clear(TileIndex tile, byte flags)

   456

{

   457

	static const Money* clear_price_table[] = {

   458

		&_price.clear_1,

   459

		&_price.purchase_land,

   460

		&_price.clear_2,

   461

		&_price.clear_3,

   462

		&_price.purchase_land,

   463

		&_price.purchase_land,

   464

		&_price.clear_2, // XXX unused?

   465

	};

   466

	CommandCost price;

   467

   468

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

   469

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

   470

	}

   471

   472

	if (flags & DC_EXEC) DoClearSquare(tile);

   473

   474

	return price;

   475

}

   476

   477

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

   478

 * the name is a bit confusing ;p

   479

 * @param tile the tile the player is selling

   480

 * @param flags for this command type

   481

 * @param p1 unused

   482

 * @param p2 unused

   483

 * @return error or cost of operation

   484

 */

   485

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

   486

{

   487

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   488

   489

	if (!IsOwnedLandTile(tile)) return CMD_ERROR;

   490

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

   491

   492

   493

	if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   494