Silverlight 引路蜂二维图形库示例:材质画刷

除了单色，渐变画刷外，也可以使用图像作为模式（Pattern）画刷来填充图形。

下面的例子使用两个PNG图像来填充图形。

private void Patterns()
{
	TextureBrush brush1;
	TextureBrush brush2;
	TextureBrush brush3;
 
	AffineTransform matrix1 = new AffineTransform();
	AffineTransform matrix2 = new AffineTransform();
 
	BitmapImage img = new BitmapImage();
	img.CreateOptions = BitmapCreateOptions.None;
	string path = "/SilverlightGraphics2DDemo;component/brick.png";
	Stream s = Application.GetResourceStream
	    (new Uri(path, UriKind.Relative)).Stream;
	img.SetSource(s);
	WriteableBitmap writeableBitmap = new WriteableBitmap(img);
	brush1 = new TextureBrush(writeableBitmap.Pixels, 
	      img.PixelWidth, img.PixelHeight);
	path = "/SilverlightGraphics2DDemo;component/bird.png";
	s = Application.GetResourceStream(new Uri(path, UriKind.Relative)).Stream;
	img.SetSource(s);
	writeableBitmap = new WriteableBitmap(img);
	brush2 = new TextureBrush(writeableBitmap.Pixels, img.PixelWidth, 
	     img.PixelHeight);
	brush3 = new TextureBrush(writeableBitmap.Pixels, img.PixelWidth, 
	     img.PixelHeight,127);
	matrix2.Translate(50, 50);
	graphics2D.Clear(Color.White);
	graphics2D.AffineTransform = (matrix1);
	graphics2D.FillRectangle(brush1, new Rectangle(20, 50, 100, 100));
	graphics2D.FillOval(brush2, 10, 10, 80, 80);
	graphics2D.AffineTransform = (matrix2);
	graphics2D.FillOval(brush3, 10, 10, 80, 80);
 
}

这个例子所用的brick.png 和bird.png ,brush3是半透明画刷。