protected override void OnBoundsChange(Rect bounds)
{
base.OnBoundsChange(bounds);
mRect.Set(margin, margin, bounds.Width() - margin, bounds.Height() - margin);
if (useGradientOverlay)
{
var colors = new int[] { 0, 0, 0x7f000000 };
var pos = new float[] { 0.0f, 0.7f, 1.0f };
RadialGradient vignette = new RadialGradient(mRect.CenterX(),
mRect.CenterY() * 1.0f / 0.7f,
mRect.CenterX() * 1.3f,
colors,
pos, Shader.TileMode.Clamp);
Matrix oval = new Matrix();
oval.SetScale(1.0f, 0.7f);
vignette.SetLocalMatrix(oval);
paint.SetShader(new ComposeShader(bitmapShader, vignette, PorterDuff.Mode.SrcOver));
}
}