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add tile grid addition support to CustomTextureAtlas

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Gered 2013-08-25 10:47:06 -04:00
parent d1f874e32f
commit faf5d09ca1
1 changed files with 36 additions and 0 deletions
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36
Blarg.GameFramework/Graphics/Atlas/CustomTextureAtlas.cs
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@ -55,6 +55,42 @@ namespace Blarg.GameFramework.Graphics.Atlas
return Add(ref region);
}
public int AddGrid(int startX, int startY, int tileWidth, int tileHeight, int numTilesX, int numTilesY, int tileBorder = 0)
{
int actualTileWidth = tileWidth + tileBorder;
int actualTileHeight = tileHeight + tileBorder;
int numAdded = 0;
for (int y = 0; y < numTilesY; ++y)
{
for (int x = 0; x < numTilesX; ++x)
{
var tile = new TextureRegion();
// pixel location/dimensions
tile.Dimensions.Left = startX + tileBorder + x * actualTileWidth;
tile.Dimensions.Top = startY + tileBorder + y * actualTileHeight;
tile.Dimensions.Right = tile.Dimensions.Left + actualTileWidth - tileBorder;
tile.Dimensions.Bottom = tile.Dimensions.Top + actualTileHeight - tileBorder;
// texture coordinates
// HACK: subtract TexCoordEdgeOffset from the bottom right edges to
// get around floating point rounding errors (adjacent tiles will
// slightly bleed in otherwise)
tile.TexCoords.Left = (tile.Dimensions.Left - tileBorder + TexCoordEdgeOffset) / (float)Width;
tile.TexCoords.Top = (tile.Dimensions.Top - tileBorder + TexCoordEdgeOffset) / (float)Height;
tile.TexCoords.Right = ((float)tile.Dimensions.Right + tileBorder - TexCoordEdgeOffset) / (float)Width;
tile.TexCoords.Bottom = ((float)tile.Dimensions.Bottom + tileBorder - TexCoordEdgeOffset) / (float)Height;
Tiles.Add(tile);
++numAdded;
}
}
return numAdded;
}
public void Reset()
{
Tiles.Clear();