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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"

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#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 "water_map.h"

    26

    27

/*

    28

 * In one terraforming command all four corners of a initial tile can be raised/lowered (though this is not available to the player).

    29

 * The maximal amount of height modifications is archieved when raising a complete flat land from sea level to MAX_TILE_HEIGHT or vice versa.

    30

 * This affects all corners with a manhatten distance smaller than MAX_TILE_HEIGHT to one of the initial 4 corners.

    31

 * Their maximal amount is computed to 4 * \sum_{i=1}^{h_max} i  =  2 * h_max * (h_max + 1).

    32

 */

    33

static const int TERRAFORMER_MODHEIGHT_SIZE = 2 * MAX_TILE_HEIGHT * (MAX_TILE_HEIGHT + 1);

    34

    35

/*

    36

 * The maximal amount of affected tiles (i.e. the tiles that incident with one of the corners above, is computed similiar to

    37

 * 1 + 4 * \sum_{i=1}^{h_max} (i+1)  =  1 + 2 * h_max + (h_max + 3).

    38

 */

    39

static const int TERRAFORMER_TILE_TABLE_SIZE = 1 + 2 * MAX_TILE_HEIGHT * (MAX_TILE_HEIGHT + 3);

    40

    41

struct TerraformerHeightMod {

    42

	TileIndex tile;   ///< Referenced tile.

    43

	byte height;      ///< New TileHeight (height of north corner) of the tile.

    44

};

    45

    46

struct TerraformerState {

    47

	int modheight_count;                                         ///< amount of entries in "modheight".

    48

	int tile_table_count;                                        ///< amount of entries in "tile_table".

    49

    50

	/**

    51

	 * Dirty tiles, i.e.\ at least one corner changed.

    52

	 *

    53

	 * This array contains the tiles which are or will be marked as dirty.

    54

	 *

    55

	 * @ingroup dirty

    56

	 */

    57

	TileIndex tile_table[TERRAFORMER_TILE_TABLE_SIZE];

    58

	TerraformerHeightMod modheight[TERRAFORMER_MODHEIGHT_SIZE];  ///< Height modifications.

    59

};

    60

    61

/**

    62

 * Gets the TileHeight (height of north corner) of a tile as of current terraforming progress.

    63

 *

    64

 * @param ts TerraformerState.

    65

 * @param tile Tile.

    66

 * @return TileHeight.

    67

 */

    68

static int TerraformGetHeightOfTile(TerraformerState *ts, TileIndex tile)

    69

{

    70

	TerraformerHeightMod *mod = ts->modheight;

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	int count;

    72

    73

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

    74

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

    75

	}

    76

    77

	/* TileHeight unchanged so far, read value from map. */

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	return TileHeight(tile);

    79

}

    80

    81

/**

    82

 * Stores the TileHeight (height of north corner) of a tile in a TerraformerState.

    83

 *

    84

 * @param ts TerraformerState.

    85

 * @param tile Tile.

    86

 * @param height New TileHeight.

    87

 */

    88

static void TerraformSetHeightOfTile(TerraformerState *ts, TileIndex tile, int height)

    89

{

    90

	/* Find tile in the "modheight" table.

    91

	 * Note: In a normal user-terraform command the tile will not be found in the "modheight" table.

    92

	 *       But during house- or industry-construction multiple corners can be terraformed at once. */

    93

	TerraformerHeightMod *mod = ts->modheight;

    94

	int count = ts->modheight_count;

    95

	while ((count > 0) && (mod->tile != tile)) {

    96

		mod++;

    97

		count--;

    98

	}

    99

   100

	/* New entry? */

   101

	if (count == 0) {

   102

		assert(ts->modheight_count < TERRAFORMER_MODHEIGHT_SIZE);

   103

		ts->modheight_count++;

   104

	}

   105

   106

	/* Finally store the new value */

   107

	mod->tile = tile;

   108

	mod->height = (byte)height;

   109

}

   110

   111

/**

   112

 * Adds a tile to the "tile_table" in a TerraformerState.

   113

 *

   114

 * @param ts TerraformerState.

   115

 * @param tile Tile.

   116

 * @ingroup dirty

   117

 */

   118

static void TerraformAddDirtyTile(TerraformerState *ts, TileIndex tile)

   119

{

   120

	int count;

   121

	TileIndex *t;

   122

   123

	count = ts->tile_table_count;

   124

   125

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

   126

		if (*t == tile) return;

   127

	}

   128

   129

	assert(ts->tile_table_count < TERRAFORMER_TILE_TABLE_SIZE);

   130

   131

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

   132

}

   133

   134

/**

   135

 * Adds all tiles that incident with the north corner of a specific tile to the "tile_table" in a TerraformerState.

   136

 *

   137

 * @param ts TerraformerState.

   138

 * @param tile Tile.

   139

 * @ingroup dirty

   140

 */

   141

static void TerraformAddDirtyTileAround(TerraformerState *ts, TileIndex tile)

   142

{

   143

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

   144

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

   145

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

   146

	TerraformAddDirtyTile(ts, tile);

   147

}

   148

   149

/**

   150

 * Terraform the north corner of a tile to a specific height.

   151

 *

   152

 * @param ts TerraformerState.

   153

 * @param tile Tile.

   154

 * @param height Aimed height.

   155

 * @param return Error code or cost.

   156

 */

   157

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

   158

{

   159

	CommandCost total_cost = CommandCost();

   160

   161

	assert(tile < MapSize());

   162

   163

	/* Check range of destination height */

   164

	if (height < 0) return_cmd_error(STR_1003_ALREADY_AT_SEA_LEVEL);

   165

	if (height > MAX_TILE_HEIGHT) return_cmd_error(STR_1004_TOO_HIGH);

   166

   167

	/*

   168

	 * Check if the terraforming has any effect.

   169

	 * This can only be true, if multiple corners of the start-tile are terraformed (i.e. the terraforming is done by towns/industries etc.).

   170

	 * In this case the terraforming should fail. (Don't know why.)

   171

	 */

   172

	if (height == TerraformGetHeightOfTile(ts, tile)) return CMD_ERROR;

   173

   174

	/* Check "too close to edge of map" */

   175

	uint x = TileX(tile);

   176

	uint y = TileY(tile);

   177

	if ((x <= 1) || (y <= 1) || (x >= MapMaxX() - 1) || (y >= MapMaxY() - 1)) {

   178

		/*

   179

		 * Determine a sensible error tile

   180

		 * Note: If x and y are both zero this will disable the error tile. (Tile 0 cannot be highlighted :( )

   181

		 */

   182

		if ((x == 1) && (y != 0)) x = 0;

   183

		if ((y == 1) && (x != 0)) y = 0;

   184

		_terraform_err_tile = TileXY(x, y);

   185

		return_cmd_error(STR_0002_TOO_CLOSE_TO_EDGE_OF_MAP);

   186

	}

   187

   188

	/* Mark incident tiles, that are involved in the terraforming */

   189

	TerraformAddDirtyTileAround(ts, tile);

   190

   191

	/* Store the height modification */

   192

	TerraformSetHeightOfTile(ts, tile, height);

   193

   194

	/* Increment cost */

   195

	total_cost.AddCost(_price.terraform);

   196

   197

	/* Recurse to neighboured corners if height difference is larger than 1 */

   198

	{

   199

		const TileIndexDiffC *ttm;

   200

   201

		static const TileIndexDiffC _terraform_tilepos[] = {

   202

			{ 1,  0}, // move to tile in SE

   203

			{-2,  0}, // undo last move, and move to tile in NW

   204

			{ 1,  1}, // undo last move, and move to tile in SW

   205

			{ 0, -2}  // undo last move, and move to tile in NE

   206

		};

   207

   208

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

   209

			tile += ToTileIndexDiff(*ttm);

   210

   211

			/* Get TileHeight of neighboured tile as of current terraform progress */

   212

			int r = TerraformGetHeightOfTile(ts, tile);

   213

			int height_diff = height - r;

   214

   215

			/* Is the height difference to the neighboured corner greater than 1? */

   216

			if (abs(height_diff) > 1) {

   217

				/* Terraform the neighboured corner. The resulting height difference should be 1. */

   218

				height_diff += (height_diff < 0 ? 1 : -1);

   219

				CommandCost cost = TerraformTileHeight(ts, tile, r + height_diff);

   220

				if (CmdFailed(cost)) return cost;

   221

				total_cost.AddCost(cost);

   222

			}

   223

		}

   224

	}

   225

   226

	return total_cost;

   227

}

   228

   229

/** Terraform land

   230

 * @param tile tile to terraform

   231

 * @param flags for this command type

   232

 * @param p1 corners to terraform (SLOPE_xxx)

   233

 * @param p2 direction; eg up (non-zero) or down (zero)

   234

 * @return error or cost of terraforming

   235

 */

   236

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

   237

{

   238

	TerraformerState ts;

   239

	CommandCost total_cost = CommandCost();

   240

	int direction = (p2 != 0 ? 1 : -1);

   241

   242

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   243

   244

	_terraform_err_tile = 0;

   245

   246

	ts.modheight_count = ts.tile_table_count = 0;

   247

   248

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

   249

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

   250

   251

	/* Compute the costs and the terraforming result in a model of the landscape */

   252

	if ((p1 & SLOPE_W) != 0) {

   253

		TileIndex t = tile + TileDiffXY(1, 0);

   254

		CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);

   255

		if (CmdFailed(cost)) return cost;

   256

		total_cost.AddCost(cost);

   257

	}

   258

   259

	if ((p1 & SLOPE_S) != 0) {

   260

		TileIndex t = tile + TileDiffXY(1, 1);

   261

		CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);

   262

		if (CmdFailed(cost)) return cost;

   263

		total_cost.AddCost(cost);

   264

	}

   265

   266

	if ((p1 & SLOPE_E) != 0) {

   267

		TileIndex t = tile + TileDiffXY(0, 1);

   268

		CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);

   269

		if (CmdFailed(cost)) return cost;

   270

		total_cost.AddCost(cost);

   271

	}

   272

   273

	if ((p1 & SLOPE_N) != 0) {

   274

		TileIndex t = tile + TileDiffXY(0, 0);

   275

		CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);

   276

		if (CmdFailed(cost)) return cost;

   277

		total_cost.AddCost(cost);

   278

	}

   279

   280

	/* Check if the terraforming is valid wrt. tunnels, bridges and objects on the surface */

   281

	{

   282

		int count;

   283

		TileIndex *ti = ts.tile_table;

   284

   285

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

   286

			TileIndex tile = *ti;

   287

   288

			/* Find new heights of tile corners */

   289

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

   290

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

   291

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

   292

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

   293

   294

			/* Find min and max height of tile */

   295

			uint z_min = min(min(z_N, z_W), min(z_S, z_E));

   296

			uint z_max = max(max(z_N, z_W), max(z_S, z_E));

   297

   298

			/* Compute tile slope */

   299

			uint tileh = (z_max > z_min + 1 ? SLOPE_STEEP : SLOPE_FLAT);

   300

			if (z_W > z_min) tileh += SLOPE_W;

   301

			if (z_S > z_min) tileh += SLOPE_S;

   302

			if (z_E > z_min) tileh += SLOPE_E;

   303

			if (z_N > z_min) tileh += SLOPE_N;

   304

   305

			/* Check if bridge would take damage */

   306

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

   307

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

   308

				_terraform_err_tile = tile; // highlight the tile under the bridge

   309

				return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   310

			}

   311

			/* Check if tunnel would take damage */

   312

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

   313

				_terraform_err_tile = tile; // highlight the tile above the tunnel

   314

				return_cmd_error(STR_1002_EXCAVATION_WOULD_DAMAGE);

   315

			}

   316

			/* Check tiletype-specific things, and add extra-cost */

   317

			CommandCost cost = _tile_type_procs[GetTileType(tile)]->terraform_tile_proc(tile, flags | DC_AUTO, z_min * TILE_HEIGHT, (Slope) tileh);

   318

			if (CmdFailed(cost)) {

   319

				_terraform_err_tile = tile;

   320

				return cost;

   321

			}

   322

			total_cost.AddCost(cost);

   323

		}

   324

	}

   325

   326

	if (flags & DC_EXEC) {

   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

			}

   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 total_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, SLOPE_N, (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, SLOPE_N, (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 (IsOwnedLandTile(tile) && IsTileOwner(tile, _current_player)) {

   430

		return_cmd_error(STR_5807_YOU_ALREADY_OWN_IT);

   431

	}

   432

   433

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

   434

	if (CmdFailed(cost)) return CMD_ERROR;

   435

   436

	if (flags & DC_EXEC) {

   437

		MakeOwnedLand(tile, _current_player);

   438

		MarkTileDirtyByTile(tile);

   439

	}

   440

   441

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

   442

}

   443

   444

   445

static CommandCost ClearTile_Clear(TileIndex tile, byte flags)

   446

{

   447

	static const Money* clear_price_table[] = {

   448

		&_price.clear_1,

   449

		&_price.purchase_land,

   450

		&_price.clear_2,

   451

		&_price.clear_3,

   452

		&_price.purchase_land,

   453

		&_price.purchase_land,

   454

		&_price.clear_2, // XXX unused?

   455

	};

   456

	CommandCost price;

   457

   458

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

   459

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

   460

	}

   461

   462

	if (flags & DC_EXEC) DoClearSquare(tile);

   463

   464

	return price;

   465

}

   466

   467

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

   468

 * the name is a bit confusing ;p

   469

 * @param tile the tile the player is selling

   470

 * @param flags for this command type

   471

 * @param p1 unused

   472

 * @param p2 unused

   473

 * @return error or cost of operation

   474

 */

   475

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

   476

{

   477

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   478

   479

	if (!IsOwnedLandTile(tile)) return CMD_ERROR;

   480

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

   481

   482

   483

	if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;

   484

   485

	if (flags & DC_EXEC) DoClearSquare(tile);

   486

   487

	return CommandCost(- _price.purchase_land * 2);

   488

}

   489