/**
* Place new trees.
*
* This function takes care of the selected tree placer algorithm and
* place randomly the trees for a new game.
*/
void GenerateTrees()
{
uint i, total;
if (_settings_game.game_creation.tree_placer == TP_NONE) return;
switch (_settings_game.game_creation.tree_placer) {
case TP_ORIGINAL: i = _settings_game.game_creation.landscape == LT_ARCTIC ? 15 : 6; break;
case TP_IMPROVED: i = _settings_game.game_creation.landscape == LT_ARCTIC ? 4 : 2; break;
default: NOT_REACHED();
}
total = ScaleByMapSize(DEFAULT_TREE_STEPS);
if (_settings_game.game_creation.landscape == LT_TROPIC) total += ScaleByMapSize(DEFAULT_RAINFOREST_TREE_STEPS);
total *= i;
uint num_groups = (_settings_game.game_creation.landscape != LT_TOYLAND) ? ScaleByMapSize(GB(Random(), 0, 5) + 25) : 0;
total += num_groups * DEFAULT_TREE_STEPS;
SetGeneratingWorldProgress(GWP_TREE, total);
if (num_groups != 0) PlaceTreeGroups(num_groups);
for (; i != 0; i--) {
PlaceTreesRandomly();
}
}
/**
* Place some trees randomly
*
* This function just place some trees randomly on the map.
*/
void PlaceTreesRandomly()
{
uint i, j, ht;
i = ScaleByMapSize(DEFAULT_TREE_STEPS);
if (_game_mode == GM_EDITOR) i /= EDITOR_TREE_DIV;
do {
uint32 r = Random();
TileIndex tile = RandomTileSeed(r);
IncreaseGeneratingWorldProgress(GWP_TREE);
if (CanPlantTreesOnTile(tile, true)) {
PlaceTree(tile, r);
if (_settings_game.game_creation.tree_placer != TP_IMPROVED) continue;
/* Place a number of trees based on the tile height.
* This gives a cool effect of multiple trees close together.
* It is almost real life ;) */
ht = GetTileZ(tile);
/* The higher we get, the more trees we plant */
j = GetTileZ(tile) / TILE_HEIGHT * 2;
/* Above snowline more trees! */
if (_settings_game.game_creation.landscape == LT_ARCTIC && ht > GetSnowLine()) j *= 3;
while (j--) {
PlaceTreeAtSameHeight(tile, ht);
}
}
} while (--i);
/* place extra trees at rainforest area */
if (_settings_game.game_creation.landscape == LT_TROPIC) {
i = ScaleByMapSize(DEFAULT_RAINFOREST_TREE_STEPS);
if (_game_mode == GM_EDITOR) i /= EDITOR_TREE_DIV;
do {
uint32 r = Random();
TileIndex tile = RandomTileSeed(r);
IncreaseGeneratingWorldProgress(GWP_TREE);
if (GetTropicZone(tile) == TROPICZONE_RAINFOREST && CanPlantTreesOnTile(tile, false)) {
PlaceTree(tile, r);
}
} while (--i);
}
}
void GenerateClearTile()
{
uint i, gi;
TileIndex tile;
/* add rough tiles */
i = ScaleByMapSize(GB(Random(), 0, 10) + 0x400);
gi = ScaleByMapSize(GB(Random(), 0, 7) + 0x80);
SetGeneratingWorldProgress(GWP_ROUGH_ROCKY, gi + i);
do {
IncreaseGeneratingWorldProgress(GWP_ROUGH_ROCKY);
tile = RandomTile();
if (IsTileType(tile, MP_CLEAR) && !IsClearGround(tile, CLEAR_DESERT)) SetClearGroundDensity(tile, CLEAR_ROUGH, 3);
} while (--i);
/* add rocky tiles */
i = gi;
do {
uint32 r = Random();
tile = RandomTileSeed(r);
IncreaseGeneratingWorldProgress(GWP_ROUGH_ROCKY);
if (IsTileType(tile, MP_CLEAR) && !IsClearGround(tile, CLEAR_DESERT)) {
uint j = GB(r, 16, 4) + 5;
for (;;) {
TileIndex tile_new;
SetClearGroundDensity(tile, CLEAR_ROCKS, 3);
do {
if (--j == 0) goto get_out;
tile_new = tile + TileOffsByDiagDir((DiagDirection)GB(Random(), 0, 2));
} while (!IsTileType(tile_new, MP_CLEAR) || IsClearGround(tile_new, CLEAR_DESERT));
tile = tile_new;
}
get_out:;
}
} while (--i);
}
