// test draw pattern
private void DrawTexture(CGContext context)
{
var destRect = context.ConvertRectToUserSpace(new CGRect(0, 0, textureImage.Width, textureImage.Height));
context.ConcatCTM(textureImage.imageTransform);
context.DrawImage(destRect, textureImage.NativeCGImage);
context.ConcatCTM(textureImage.imageTransform.Invert());
if (wrapMode == WrapMode.TileFlipX || wrapMode == WrapMode.TileFlipXY)
{
context.ConcatCTM(CGAffineTransform.MakeScale(-1, 1));
context.ConcatCTM(textureImage.imageTransform);
context.DrawImage(destRect, textureImage.NativeCGImage);
context.ConcatCTM(textureImage.imageTransform.Invert());
}
if (wrapMode == WrapMode.TileFlipY || wrapMode == WrapMode.TileFlipXY)
{
var transformY = new CGAffineTransform(1, 0, 0, -1,
destRect.Width,
destRect.Height);
context.ConcatCTM(transformY);
context.ConcatCTM(textureImage.imageTransform);
context.DrawImage(destRect, textureImage.NativeCGImage);
context.ConcatCTM(textureImage.imageTransform.Invert());
}
if (wrapMode == WrapMode.TileFlipXY)
{
// draw the last one of the quadrant which is flipped by both the y and x axis
var transform = new CGAffineTransform(-1, 0, 0, -1,
destRect.Width * 2, destRect.Height);
context.ConcatCTM(transform);
context.ConcatCTM(textureImage.imageTransform);
context.DrawImage(destRect, textureImage.NativeCGImage);
context.ConcatCTM(textureImage.imageTransform.Invert());
}
}