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Merge 89182e4b15 into 14200212b7

pull/12712/merge
Su 2024-06-29 23:57:13 +03:00 committed by GitHub
parent 14200212b7 89182e4b15
commit 16ff0a297f
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GPG Key ID: B5690EEEBB952194
1 changed files with 33 additions and 1 deletions
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34
src/tree_cmd.cpp
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@ -57,6 +57,8 @@ uint8_t _trees_tick_ctr;
static const uint16_t DEFAULT_TREE_STEPS = 1000; ///< Default number of attempts for placing trees.
static const uint16_t DEFAULT_RAINFOREST_TREE_STEPS = 15000; ///< Default number of attempts for placing extra trees at rainforest in tropic.
static const uint16_t EDITOR_TREE_DIV = 5; ///< Game editor tree generation divisor factor.
static const uint16_t FOREST_THRESHOLD = 6; ///< Minimum amount of trees required to be considered a forest.
static const uint16_t FOREST_SEARCH_RADIUS = 2; ///< Radius of area to examine when determining forest status.
/**
* Tests if a tile can be converted to MP_TREES
@ -80,6 +82,30 @@ static bool CanPlantTreesOnTile(TileIndex tile, bool allow_desert)
}
}
/**
* Tests if a tile is near an already existing forest.
* Trees won't spread if not placed near some other trees.
*
* @param tile the tile of interest
* @return true if the tile is near a forest
*/
static bool IsNearbyForest(TileIndex tile)
{
uint planted_tile_count = 0;
/* An already planted tile can always be planted again. */
if (IsTileType(tile, MP_TREES)) return true;
/* Count the trees around the clear tile to determine if it's near a forest */
for (TileIndex t : TileArea(tile).Expand(FOREST_SEARCH_RADIUS)) {
if (!IsTileType(t, MP_TREES)) continue;
++planted_tile_count;
if (planted_tile_count >= FOREST_THRESHOLD) return true;
}
return false;
}
/**
* Creates a tree tile
* Ground type and density is preserved.
@ -758,6 +784,9 @@ static void TileLoop_Trees(TileIndex tile)
/* Don't plant trees, if ground was freshly cleared */
if (IsTileType(tile, MP_CLEAR) && GetClearGround(tile) == CLEAR_GRASS && GetClearDensity(tile) != 3) return;
/* Plants trees only near existing forests */
if (_settings_game.game_creation.tree_placer == TP_IMPROVED && !IsNearbyForest(tile)) return;
PlantTreesOnTile(tile, treetype, 0, 0);
break;
@ -770,7 +799,7 @@ static void TileLoop_Trees(TileIndex tile)
break;
case 6: // final stage of tree destruction
if (!CanPlantExtraTrees(tile)) {
if (!CanPlantExtraTrees(tile) || (_settings_game.game_creation.tree_placer == TP_IMPROVED && !IsNearbyForest(tile))) {
/* if trees can't spread just plant a new one to prevent deforestation */
SetTreeGrowth(tile, 0);
} else if (GetTreeCount(tile) > 1) {
@ -859,6 +888,9 @@ void OnTick_Trees()
r = Random();
tile = RandomTileSeed(r);
if (CanPlantTreesOnTile(tile, false) && (tree = GetRandomTreeType(tile, GB(r, 24, 8))) != TREE_INVALID) {
/* Plants trees only near existing forests */
if (_settings_game.game_creation.tree_placer == TP_IMPROVED && !IsNearbyForest(tile)) return;
PlantTreesOnTile(tile, tree, 0, 0);
}
}