protected virtual bool CurrentScreenClipping(out RectangleDouble screenClippingRect)
{
if (screenClipping.NeedRebuild)
{
DrawCount++;
screenClipping.screenClippingRect = TransformToScreenSpace(LocalBounds);
if (Parent != null)
{
RectangleDouble screenParentClipping;
if (Parent.CurrentScreenClipping(out screenParentClipping))
{
RectangleDouble intersectionRect = new RectangleDouble();
if (intersectionRect.IntersectRectangles(screenClipping.screenClippingRect, screenParentClipping))
{
screenClipping.screenClippingRect = intersectionRect;
screenClipping.visibleAfterClipping = true;
}
else
{
// this rect is clipped away by the parent rect so return false.
screenClipping.visibleAfterClipping = false;
}
}
else
{
// the parent is completely clipped away, so this is too.
screenClipping.visibleAfterClipping = false;
}
}
screenClipping.NeedRebuild = false;
}
screenClippingRect = screenClipping.screenClippingRect;
return screenClipping.visibleAfterClipping;
}