private void btnDrawWithMask_Click(object sender, EventArgs e)
{
//clear background
drawer.Clear(Colors.White);
//render hint for mask region
DrawMaskRegion();
//create an opacity mask
MaskBuffer mask = new MaskBuffer(buffer.Width, buffer.Height);
double[] coordinates = TestFactory.Star();
TestFactory.Scale(coordinates, 8.0);
Fill fill = Fills.Black;
MaskDrawer maskDrawer = new MaskDrawer(mask);
maskDrawer.DrawPolygon(fill, coordinates);
//render the lion using the opacity mask
drawer.Mask = mask;
DrawLion();
//show to screen
DisplayBuffer(buffer);
//reset opacity mask so that other tests aren't afffected
drawer.Mask = null;
}
/// <summary>
/// Create a new instance for the provided buffer
/// </summary>
public MaskDrawer(MaskBuffer buffer)
{
mBuffer = buffer;
}