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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"

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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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#include "town.h"

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    27

struct TerraformerHeightMod {

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	TileIndex tile;

    29

	byte height;

    30

};

    31

    32

struct TerraformerState {

    33

	int height[4];

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	uint32 flags;

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    36

	int direction;

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	int modheight_count;

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	int tile_table_count;

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    41

    42

	TileIndex *tile_table;

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	TerraformerHeightMod *modheight;

    44

    45

};

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    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;

    53

    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

	}

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    59

	return 1;

    60

}

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    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

	}

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    71

	return TileHeight(tile);

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}

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    74

static void TerraformAddDirtyTile(TerraformerState *ts, TileIndex tile)

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{

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	int count;

    77

	TileIndex *t;

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    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

	}

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    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));

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	TerraformAddDirtyTile(ts, tile);

    96

}

    97

    98

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

    99

{

   100

	int r;

   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 == 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

   145

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

   146

   147

	if (CmdFailed(ret)) {

   148

		_terraform_err_tile = tile;

   149

		return -1;

   150

	}

   151

   152

	ts->cost += ret;

   153

   154

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

   155

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

   156

   157

	return 0;

   158

}

   159

   160

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

   161

{

   162

	int nh;

   163

	TerraformerHeightMod *mod;

   164

	int count;

   165

   166

	assert(tile < MapSize());

   167

   168

	if (height < 0) {

   169

		_error_message = STR_1003_ALREADY_AT_SEA_LEVEL;

   170

		return false;

   171

	}

   172

   173

	_error_message = STR_1004_TOO_HIGH;

   174

   175

	if (height > 15) return false;

   176

   177

	nh = TerraformGetHeightOfTile(ts, tile);

   178

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

   179

   180

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

   181

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

   182

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

   183

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

   184

   185

	mod = ts->modheight;

   186

	count = ts->modheight_count;

   187

   188

	for (;;) {

   189

		if (count == 0) {

   190

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

   191

			ts->modheight_count++;

   192

			break;

   193

		}

   194

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

   195

		mod++;

   196

		count--;

   197

	}

   198

   199

	mod->tile = tile;

   200

	mod->height = (byte)height;

   201

   202

	ts->cost += _eco->GetPrice(CEconomy::TERRAFORM);

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   204

	{

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		int direction = ts->direction, r;

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		const TileIndexDiffC *ttm;

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   208

		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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   215

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

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			tile += ToTileIndexDiff(*ttm);

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   218

			r = TerraformGetHeightOfTile(ts, tile);

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

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

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					return false;

   222

			}

   223

		}

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	}

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   226

	return true;

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}

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   229

/** Terraform land

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 * @param tile tile to terraform

   231

 * @param flags for this command type

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 * @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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{

   238

	TerraformerState ts;

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	TileIndex t;

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	int direction;

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   242

	TerraformerHeightMod modheight_data[576];

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	TileIndex tile_table_data[625];

   244

   245

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   246

   247

	_terraform_err_tile = 0;

   248

   249

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

   250

	ts.flags = flags;

   251

	ts.modheight_count = ts.tile_table_count = 0;

   252

	ts.cost = 0;

   253

	ts.modheight = modheight_data;

   254

	ts.tile_table = tile_table_data;

   255

   256

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

   257

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

   258

   259

	if (p1 & 1) {

   260

		t = tile + TileDiffXY(1, 0);

   261

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

   262

			return CMD_ERROR;

   263

		}

   264

	}

   265

   266

	if (p1 & 2) {

   267

		t = tile + TileDiffXY(1, 1);

   268

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

   269

			return CMD_ERROR;

   270

		}

   271

	}

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   273

	if (p1 & 4) {

   274

		t = tile + TileDiffXY(0, 1);

   275

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

   276

			return CMD_ERROR;

   277

		}

   278

	}

   279

   280

	if (p1 & 8) {

   281

		t = tile + TileDiffXY(0, 0);

   282

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

   283

			return CMD_ERROR;

   284

		}

   285

	}

   286

   287

	{

   288

		/* Check if tunnel would take damage */

   289

		int count;

   290

		TileIndex *ti = ts.tile_table;

   291

   292

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

   293

			TileIndex tile = *ti;

   294

   295

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

   296

			uint z_max = z_min;

   297

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

   298

			z_min = min(z_min, t);

   299

			z_max = max(z_max, t);

   300

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

   301

			z_min = min(z_min, t);

   302

			z_max = max(z_max, t);

   303

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

   304

			z_min = min(z_min, t);

   305

			z_max = max(z_max, t);

   306

   307

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

   308

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

   309

				return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   310

			}

   311

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

   312

				return_cmd_error(STR_1002_EXCAVATION_WOULD_DAMAGE);

   313

			}

   314

		}

   315

	}

   316

   317

	if (flags & DC_EXEC) {

   318

		/* Clear the landscape at the tiles */

   319

		{

   320

			int count;

   321

			TileIndex *ti = ts.tile_table;

   322

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

   323

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

   324

			}

   325

		}

   326

   327

		/* change the height */

   328

		{

   329

			int count;

   330

			TerraformerHeightMod *mod;

   331

   332

			mod = ts.modheight;

   333

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

   334

				TileIndex til = mod->tile;

   335

   336

				SetTileHeight(til, mod->height);

   337

				TerraformAddDirtyTileAround(&ts, til);

   338

			}

   339

		}

   340

   341

		/* finally mark the dirty tiles dirty */

   342

		{

   343

			int count;

   344

			TileIndex *ti = ts.tile_table;

   345

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

   346

				MarkTileDirtyByTile(*ti);

   347

			}

   348

		}

   349

	}

   350

	return ts.cost;

   351

}

   352

   353

   354

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

   355

 * @param tile end tile of area-drag

   356

 * @param flags for this command type

   357

 * @param p1 start tile of area drag

   358

 * @param p2 unused

   359

 * @return  error or cost of terraforming

   360

 */

   362

{

   363

	int size_x, size_y;

   364

	int ex;

   365

	int ey;

   366

	int sx, sy;

   367

	uint h, curh;

   371

   372

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

   373

   374

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   375

   376

	/* remember level height */

   377

	h = TileHeight(p1);

   378

   379

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

   380

	ex = TileX(tile);

   381

	ey = TileY(tile);

   382

	sx = TileX(p1);

   383

	sy = TileY(p1);

   384

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

   385

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

   386

	tile = TileXY(sx, sy);

   387

   388

	size_x = ex - sx + 1;

   389

	size_y = ey - sy + 1;

   390

   391

	money = GetAvailableMoneyForCommand();

   392

	cost = 0;

   393

   394

	BEGIN_TILE_LOOP(tile2, size_x, size_y, tile) {

   395

		curh = TileHeight(tile2);

   396

		while (curh != h) {

   397

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

   398

			if (CmdFailed(ret)) break;

   399

			cost += ret;

   400

   401

			if (flags & DC_EXEC) {

   402

				if ((money -= ret) < 0) {

   403

					_additional_cash_required = ret;

   404

					return cost - ret;

   405

				}

   406

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

   407

			}

   408

   409

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

   410

		}

   411

	} END_TILE_LOOP(tile2, size_x, size_y, tile)

   412

   413

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

   414

}

   415

   416

/**

   417

 * Purchase a single tile

   418

 * @param tile the tile the player is purchasing

   419

 * @param flags for this command type

   420

 * @param p1 unused

   421

 * @param p2 unused

   422

 * @return error of cost of operation

   423

 */

   425

{

   427

   428

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   429

   430

	if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   431

   432

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

   433

		return_cmd_error(STR_5807_YOU_ALREADY_OWN_IT);

   434

	}

   435

   436

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

   437

	if (CmdFailed(cost)) return CMD_ERROR;

   438

   439

	if (flags & DC_EXEC) {

   440

		MakeOwnedLand(tile, _current_player);

   441

		MarkTileDirtyByTile(tile);

   442

	}

   443

   444

	return cost + Town::GetTilePrice(tile);

   445

}

   446

   447

   449

{

   450

	static const int32 clear_price_table[] = {

   451

		_eco->GetPrice(CEconomy::CLEAR_1),

   452

		_eco->GetPrice(CEconomy::PURCHASE_LAND),

   453

		_eco->GetPrice(CEconomy::CLEAR_2),

   454

		_eco->GetPrice(CEconomy::CLEAR_3),

   455

		_eco->GetPrice(CEconomy::PURCHASE_LAND),

   456

		_eco->GetPrice(CEconomy::PURCHASE_LAND),

   457

		_eco->GetPrice(CEconomy::CLEAR_2), // XXX unused?

   458

	};

   460

   461

	if (IsClearGround(tile, CLEAR_GRASS) && GetClearDensity(tile) == 0) {

   462

		price = 0;

   463

	} else {

   464

		price = clear_price_table[GetClearGround(tile)];

   465

	}

   466

   467

	if (flags & DC_EXEC) DoClearSquare(tile);

   468

   469

	return price;

   470

}

   471

   472

/**

   473

 * Sell a tile

   474

 * @param tile the tile the player is selling

   475

 * @param flags for this command type

   476

 * @param p1 unused

   477

 * @param p2 unused

   478

 * @return error or cost of operation

   479

 */

   481

{

   482

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   483

   484

	if (!IsOwnedLandTile(tile)) return CMD_ERROR;

   485

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

   486

   487

   488

	if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   489

   490

	if (flags & DC_EXEC) DoClearSquare(tile);

   491

   492

	return -Town::GetTilePrice(tile);

   493

}

   494

   495