public void ExpandToInclude(RectInt rectToInclude)
{
if (Right < rectToInclude.Right) Right = rectToInclude.Right;
if (Top < rectToInclude.Top) Top = rectToInclude.Top;
if (Left > rectToInclude.Left) Left = rectToInclude.Left;
if (Bottom > rectToInclude.Bottom) Bottom = rectToInclude.Bottom;
}