public static float SquaredDistance(this FloatRect f, Vector2f v)
{
var max = f.Max();
var dx1 = v.X - max.X;
if (dx1 < 0)
{
dx1 = 0f;
}
var dx = f.Left - v.X;
if (dx1 > dx)
{
dx = dx1;
}
var dy1 = v.Y - max.Y;
if (dy1 < 0)
{
dy1 = 0f;
}
var dy = f.Top - v.Y;
if (dy1 > dy)
{
dy = dy1;
}
return((dx * dx) + (dy * dy));
}