* This function takes care of the fact that land in OpenTTD can never differ * more than 1 in height */
| 401 | * more than 1 in height |
| 402 | */ |
| 403 | void FixSlopes() |
| 404 | { |
| 405 | uint width, height; |
| 406 | int row, col; |
| 407 | uint8_t current_height; |
| 408 | uint8_t max_height = _settings_game.construction.map_height_limit; |
| 409 | |
| 410 | /* Adjust height difference to maximum one horizontal/vertical change. */ |
| 411 | width = Map::SizeX(); |
| 412 | height = Map::SizeY(); |
| 413 | |
| 414 | /* Top and left edge */ |
| 415 | for (row = 0; (uint)row < height; row++) { |
| 416 | for (col = 0; (uint)col < width; col++) { |
| 417 | current_height = MAX_TILE_HEIGHT; |
| 418 | if (col != 0) { |
| 419 | /* Find lowest tile; either the top or left one */ |
| 420 | current_height = TileHeight(TileXY(col - 1, row)); // top edge |
| 421 | } |
| 422 | if (row != 0) { |
| 423 | if (TileHeight(TileXY(col, row - 1)) < current_height) { |
| 424 | current_height = TileHeight(TileXY(col, row - 1)); // left edge |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | /* Does the height differ more than one? */ |
| 429 | TileIndex tile = TileXY(col, row); |
| 430 | if (TileHeight(tile) >= (uint)current_height + 2) { |
| 431 | /* Then change the height to be no more than one */ |
| 432 | SetTileHeight(tile, current_height + 1); |
| 433 | /* Height was changed so now there's a chance, more likely at higher altitude, of the |
| 434 | * tile turning into rock. */ |
| 435 | if (IsInnerTile(tile) && RandomRange(max_height) <= current_height) { |
| 436 | MakeClear(tile, CLEAR_ROCKS, 3); |
| 437 | } |
| 438 | } |
| 439 | } |
| 440 | } |
| 441 | |
| 442 | /* Bottom and right edge */ |
| 443 | for (row = height - 1; row >= 0; row--) { |
| 444 | for (col = width - 1; col >= 0; col--) { |
| 445 | current_height = MAX_TILE_HEIGHT; |
| 446 | if ((uint)col != width - 1) { |
| 447 | /* Find lowest tile; either the bottom and right one */ |
| 448 | current_height = TileHeight(TileXY(col + 1, row)); // bottom edge |
| 449 | } |
| 450 | |
| 451 | if ((uint)row != height - 1) { |
| 452 | if (TileHeight(TileXY(col, row + 1)) < current_height) { |
| 453 | current_height = TileHeight(TileXY(col, row + 1)); // right edge |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | /* Does the height differ more than one? */ |
| 458 | TileIndex tile = TileXY(col, row); |
| 459 | if (TileHeight(tile) >= (uint)current_height + 2) { |
| 460 | /* Then change the height to be no more than one */ |
no test coverage detected