public IntersectCase Intersect(Rectangle rectangle)
{
throw new NotImplementedException();
//TODO
}
public IntersectCase Intersect(Rectangle rectangle)
{
// Test if all 4 corners of the rectangle are inside the ellipse
var ul = new Point2D(rectangle.MinPt.X, rectangle.MaxPt.Y);
var ur = new Point2D(rectangle.MaxPt.X, rectangle.MaxPt.Y);
var ll = new Point2D(rectangle.MinPt.X, rectangle.MinPt.Y);
var lr = new Point2D(rectangle.MaxPt.X, rectangle.MinPt.Y);
if (Contains(ul) && Contains(ur) && Contains(ll) && Contains(lr)) return IntersectCase.CONTAINS;
// Test if any of the rectangle edges intersect
Point2D pt0 = new Point2D(), pt1 = new Point2D();
var bottom = new LineSegment(ll, lr);
if (Intersect(bottom, pt0, pt1) > 0)
return IntersectCase.INTERSECTS;
var top = new LineSegment(ul, ur);
if (Intersect(top, pt0, pt1) > 0)
return IntersectCase.INTERSECTS;
var left = new LineSegment(ll, ul);
if (Intersect(left, pt0, pt1) > 0)
return IntersectCase.INTERSECTS;
var right = new LineSegment(lr, ur);
if (Intersect(right, pt0, pt1) > 0)
return IntersectCase.INTERSECTS;
// Ellipse does not intersect any edge : since the case for the ellipse
// containing the rectangle was considered above then if the center
// is inside the ellipse is fully inside and if center is outside
// the ellipse is fully outside
return (rectangle.Contains(_center)) ? IntersectCase.WITHIN : IntersectCase.OUTSIDE;
}