private PointF[] CalculateFaceTextureCoordinates(TmxTile tmxTile, bool flipDiagonal, bool flipHorizontal, bool flipVertical)
{
Point imageLocation = tmxTile.LocationOnSource;
Size tileSize = tmxTile.TileSize;
Size imageSize = tmxTile.TmxImage.Size;
PointF[] points = new PointF[4];
points[0] = imageLocation;
points[1] = PointF.Add(imageLocation, new Size(tileSize.Width, 0));
points[2] = PointF.Add(imageLocation, tileSize);
points[3] = PointF.Add(imageLocation, new Size(0, tileSize.Height));
// Transform the points with our flip flags
PointF center = new PointF(tileSize.Width * 0.5f, tileSize.Height * 0.5f);
center.X += imageLocation.X;
center.Y += imageLocation.Y;
TmxMath.TransformPoints_DiagFirst(points, center, flipDiagonal, flipHorizontal, flipVertical);
// "Tuck in" the points a tiny bit to help avoid seams
// This can be turned off by setting Texel Bias to zero
// Note that selecting a texel bias that is too small or a texture that is too big may affect pixel-perfect rendering (pixel snapping in shader will help)
float bias = 0.0f;
PointF[] tucks = new PointF[4];
if (Tiled2Unity.Settings.TexelBias > 0)
{
bias = 1.0f / Tiled2Unity.Settings.TexelBias;
tucks[0].X += 1.0f;
tucks[0].Y += 1.0f;
tucks[1].X -= 1.0f;
tucks[1].Y += 1.0f;
tucks[2].X -= 1.0f;
tucks[2].Y -= 1.0f;
tucks[3].X += 1.0f;
tucks[3].Y -= 1.0f;
}
TmxMath.TransformPoints_DiagFirst(tucks, PointF.Empty, flipDiagonal, flipHorizontal, flipVertical);
PointF[] coordinates = new PointF[4];
coordinates[3] = TmxMath.AddPoints(PointToTextureCoordinate(points[0], imageSize), TmxMath.ScalePoint(tucks[0].X, -tucks[0].Y, bias));
coordinates[2] = TmxMath.AddPoints(PointToTextureCoordinate(points[1], imageSize), TmxMath.ScalePoint(tucks[1].X, -tucks[1].Y, bias));
coordinates[1] = TmxMath.AddPoints(PointToTextureCoordinate(points[2], imageSize), TmxMath.ScalePoint(tucks[2].X, -tucks[2].Y, bias));
coordinates[0] = TmxMath.AddPoints(PointToTextureCoordinate(points[3], imageSize), TmxMath.ScalePoint(tucks[3].X, -tucks[3].Y, bias));
return(coordinates);
}