bisect.fx

affine

        var u:Point2D = a.findBoundaryPoint(b.position, a.position);
        var v:Point2D = b.findBoundaryPoint(a.position, b.position);

        var l:Float = Math.sqrt(pointsLenSqr(u, v));

        content = [
            Path {
                transforms: [
                    Affine {
                        mxx: (v.x-u.x)/l
                        mxy: (v.y-u.y)/l
                        myx: (v.y-u.y)/l
                        myy: -(v.x-u.x)/l
                        tx: u.x
                        ty: u.y
                    }
                ]

            elements: [
                MoveTo {
                    x: 0
                    y: 0
                }
                LineTo {
                    x: l
                    y: 0
                }
                LineTo {
                    x: l-10
                    y: 5
                }
                MoveTo {
                    x: l
                    y: 0
                }
                LineTo {
                    x: l-10
                    y: -5
                }
                ...

bisect.fx

public function findBoundaryPoint(a:Point2D,b:Point2D):Point2D {
        // a is outside, b is inside
        var m:Point2D = middle(a,b);
        if (pointsLenSqr(a, b) < 1.) {
            return m;
        } else {
            var n:Point2D = Point2D {
                x: m.x - position.x
                y: m.y - position.y
            }

            if (contains(n)) {
                return findBoundaryPoint(a,m);
            } else {
                return findBoundaryPoint(m,b);
            }
        }
    }