Collections.sort(onCircle, new Comparator<Point2DDouble>() {

            int get(Point2DDouble e) {
                int x = comp.compare(e.x, 0);
                int y = comp.compare(e.y, 0);
                if (x > 0) {
                    return y > 0 ? 2 : y < 0 ? 8 : 1;
                } else if (x < 0) {
                    return y > 0 ? 4 : y < 0 ? 6 : 5;
                } else {
                    return y > 0 ? 3 : y < 0 ? 7 : 0;
                }
            }

            @Override
            public int compare(Point2DDouble o1, Point2DDouble o2) {
                o1 = o1.subtract(circleCenter);
                o2 = o2.subtract(circleCenter);
                int c = get(o1) - get(o2);
                if (c != 0) return c;
                return comp.compare(o2.vmul(o1), 0);
            }
        });