猜猜这是干什么的

var rx = FrameBounds.Width / 2;
var ry = FrameBounds.Height / 2;
var cx = CenterPoint.X - pt.X;
var cy = CenterPoint.Y - pt.Y;

var result = Math.Pow(ry, 2) * Math.Pow(cx, 2) + Math.Pow(rx, 2) * Math.Pow(cy, 2) - Math.Pow(rx, 2) * Math.Pow(ry, 2) <= 0;