internal void DrawInContext(CGContext ctx)
{
var backend = new CGContextBackend {
Context = ctx,
InverseViewTransform = ctx.GetCTM ().Invert ()
};
DrawInContext (backend);
}
static void SetupContextForDrawing(CGContext ctx)
{
if (ctx.IsPathEmpty ())
return;
// setup pattern drawing to better match the behavior of Cairo
var drawPoint = ctx.GetCTM ().TransformPoint (ctx.GetPathBoundingBox ().Location);
var patternPhase = new SizeF (drawPoint.X, drawPoint.Y);
if (patternPhase != SizeF.Empty)
ctx.SetPatternPhase (patternPhase);
}
// test draw pattern
protected void DrawTexture(CGContext context)
{
var destRect = new RectangleF(0,0,textureImage.Width,textureImage.Height);
context.DrawImage(destRect, textureImage.NativeCGImage);
if (wrapMode == WrapMode.TileFlipX)
{
context.ConcatCTM(CGAffineTransform.MakeScale(-1,1));
context.DrawImage(destRect, textureImage.NativeCGImage);
}
if (wrapMode == WrapMode.TileFlipY)
{
var transformY = new CGAffineTransform(1, 0, 0, -1,
textureImage.Width,
textureImage.Height);
context.ConcatCTM(transformY);
context.DrawImage(destRect, textureImage.NativeCGImage);
}
if (wrapMode == WrapMode.TileFlipXY)
{
// draw the original
var transform = new CGAffineTransform(1, 0, 0, 1,
0, textureImage.Height);
context.ConcatCTM(transform);
context.DrawImage(destRect, textureImage.NativeCGImage);
// reset the transform
context.ConcatCTM (context.GetCTM().Invert());
// draw next to original one that is flipped by x axis
transform = new CGAffineTransform(-1, 0, 0, 1,
textureImage.Width * 2, textureImage.Height);
context.ConcatCTM(transform);
context.DrawImage(destRect, textureImage.NativeCGImage);
// reset the transform
context.ConcatCTM (context.GetCTM().Invert());
// draw one that is flipped by Y axis under the oricinal
transform = new CGAffineTransform(1, 0, 0, -1,
0, textureImage.Height);
context.ConcatCTM(transform);
context.DrawImage(destRect, textureImage.NativeCGImage);
// draw the last one of the quadrant which is flipped by both the y and x axis
context.ConcatCTM (context.GetCTM().Invert());
transform = new CGAffineTransform(-1, 0, 0, -1,
textureImage.Width * 2, textureImage.Height);
context.ConcatCTM(transform);
context.DrawImage(destRect, textureImage.NativeCGImage);
}
}
