public static Rectangle32 ToRectangle(this Circle32 c)
{
var edge = c.Radius * 2 + 1;
return(new Rectangle32(
c.Center.Moved(-c.Radius, -c.Radius),
new Point32(edge, edge)));
}
public static bool Contains(this Circle32 c, Point32 point)
{
var delta = point - c.Center;
var radiusSquared = c.Radius * c.Radius;
var distanceSquared = delta.LengthSquared();
return(distanceSquared <= radiusSquared);
}