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Prevent spread/regrowth of temperate trees already on snowy ground

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This commit is contained in:
Jonathan G Rennison
2022-11-07 18:54:42 +00:00
parent ce3eb338ba
commit 6154406d8a
1 changed files with 13 additions and 2 deletions
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15
src/tree_cmd.cpp
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@@ -898,6 +898,15 @@ static bool CanPlantExtraTrees(TileIndex tile)
_settings_game.construction.extra_tree_placement == ETP_SPREAD_ALL);
}
static bool IsTemperateTreeOnSnow(TileIndex tile)
{
if (_settings_game.game_creation.landscape == LT_ARCTIC && IsInsideMM(GetTreeType(tile), TREE_TEMPERATE, TREE_SUB_ARCTIC)) {
TreeGround ground = GetTreeGround(tile);
if (ground == TREE_GROUND_SNOW_DESERT || ground == TREE_GROUND_ROUGH_SNOW) return true;
}
return false;
}
static void TileLoop_Trees(TileIndex tile)
{
if (GetTreeGround(tile) == TREE_GROUND_SHORE) {
@@ -947,7 +956,9 @@ static void TileLoop_Trees(TileIndex tile)
GetTropicZone(tile) == TROPICZONE_DESERT) {
AddTreeGrowth(tile, 1);
} else {
switch (GB(Random(), 0, 3)) {
uint mode = GB(Random(), 0, 3);
if (IsTemperateTreeOnSnow(tile)) mode = 0;
switch (mode) {
case 0: // start destructing
AddTreeGrowth(tile, 1);
break;
@@ -1000,7 +1011,7 @@ static void TileLoop_Trees(TileIndex tile)
break;
case 6: // final stage of tree destruction
if (!CanPlantExtraTrees(tile)) {
if (!CanPlantExtraTrees(tile) && !IsTemperateTreeOnSnow(tile)) {
/* if trees can't spread just plant a new one to prevent deforestation */
SetTreeGrowth(tile, 0);
} else if (GetTreeCount(tile) > 1) {