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(svn r132) -Fix: [1014278] TileAddWrap() gave wrong results. Fixed now.

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This commit is contained in:
truelight
2004-08-24 12:54:37 +00:00
parent c32166a5c9
commit a0ba5a7939
3 changed files with 19 additions and 8 deletions
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2
functions.h
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@@ -28,7 +28,7 @@ void ClickTile(uint tile);
void GetTileDesc(uint tile, TileDesc *td);
void DrawTile(TileInfo *ti);
uint TileAddWrap(TileIndex tile, int add);
uint TileAddWrap(TileIndex tile, int addx, int addy);
enum {
TILE_WRAPPED = (uint)-1
};

4
industry_cmd.c
View File

@@ -969,7 +969,7 @@ static void MaybePlantFarmField(Industry *i)
{
uint tile;
if (CHANCE16(1,8)) {
tile = TileAddWrap(i->xy, TILE_XY(i->width>>1, i->height>>1) + (Random()&TILE_XY(31,31))-TILE_XY(16,16));
tile = TileAddWrap(i->xy, ((i->width>>1) + Random() % 31 - 16), ((i->height>>1) + Random() % 31 - 16));
if (tile != TILE_WRAPPED)
PlantFarmField(tile);
}
@@ -1473,7 +1473,7 @@ static void DoCreateNewIndustry(Industry *i, uint tile, int type, const Industry
if (i->type == IT_FARM || i->type == IT_FARM_2) {
tile = i->xy + TILE_XY((i->width >> 1), (i->height >> 1));
for(j=0; j!=50; j++) {
uint new_tile = TileAddWrap(tile, (Random() & TILE_XY(31,31)) - TILE_XY(16,16));
uint new_tile = TileAddWrap(tile, Random() % 31 - 16, Random() % 31 - 16);
if (new_tile != TILE_WRAPPED)
PlantFarmField(new_tile);
}

19
landscape.c
View File

@@ -742,11 +742,22 @@ TileIndex AdjustTileCoordRandomly(TileIndex a, byte rng)
);
}
uint TileAddWrap(TileIndex tile, int add)
// This function checks if we add addx/addy to tile, if we
// do wrap around the edges. For example, tile = (10,2) and
// addx = +3 and addy = -4. This function will now return
// TILE_WRAPPED, because the y is wrapped. This is needed in
// for example, farmland. When the tile is not wrapped,
// the result will be tile + TILE_XY(addx, addy)
uint TileAddWrap(TileIndex tile, int addx, int addy)
{
uint t = tile + add;
if (t < TILES_X * TILE_Y_MAX && GET_TILE_X(t) != TILE_X_MAX)
return t;
int x, y;
x = GET_TILE_X(tile) + addx;
y = GET_TILE_Y(tile) + addy;
// Are we about to wrap?
if (x > 0 && x < TILE_X_MAX && y > 0 && y < TILE_Y_MAX)
return tile + TILE_XY(addx, addy);
return TILE_WRAPPED;
}