mirror
/
OpenTTD
mirror of https://github.com/OpenTTD/OpenTTD
1
0
Fork 0
Code Issues

(svn r18670) -Fix [FS#3455]: Update all tiles when snowline height changes in larger steps than one tile.

release/1.0
alberth 2009-12-30 19:30:49 +00:00
parent 84a7f6aa5b
commit d86dbabbc4
1 changed files with 17 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
src/clear_cmd.cpp
View File

@ -156,30 +156,34 @@ void TileLoopClearHelper(TileIndex tile)
}
/* convert into snowy tiles */
/** Convert to or from snowy tiles. */
static void TileLoopClearAlps(TileIndex tile)
{
int k = GetTileZ(tile) - GetSnowLine() + TILE_HEIGHT;
if (k < 0) { // well below the snow line
if (k < 0) {
/* Below the snow line, do nothing if no snow. */
if (!IsClearGround(tile, CLEAR_SNOW)) return;
if (GetClearDensity(tile) == 0) SetClearGroundDensity(tile, CLEAR_GRASS, 3);
} else {
/* At or above the snow line, make snow tile if needed. */
if (!IsClearGround(tile, CLEAR_SNOW)) {
SetClearGroundDensity(tile, CLEAR_SNOW, 0);
} else {
uint density = min((uint)k / TILE_HEIGHT, 3);
if (GetClearDensity(tile) < density) {
AddClearDensity(tile, 1);
} else if (GetClearDensity(tile) > density) {
AddClearDensity(tile, -1);
} else {
return;
}
MarkTileDirtyByTile(tile);
return;
}
}
/* Update snow density. */
uint curent_density = GetClearDensity(tile);
uint req_density = (k < 0) ? 0u : min((uint)k / TILE_HEIGHT, 3);
if (curent_density < req_density) {
AddClearDensity(tile, 1);
} else if (curent_density > req_density) {
AddClearDensity(tile, -1);
} else {
/* Density at the required level. */
if (k < 0) SetClearGroundDensity(tile, CLEAR_GRASS, 3);
}
MarkTileDirtyByTile(tile);
}