public static Point2D nearestPointOnLine(double ax, double ay, double bx, double by, double px, double py,
			boolean clampToSegment, Point2D dest) {
		// Thanks StackOverflow!
		// http://stackoverflow.com/questions/1459368/snap-point-to-a-line-java
		if (dest == null) {
			dest = new Point2D.Double();
		}

		double apx = px - ax;
		double apy = py - ay;
		double abx = bx - ax;
		double aby = by - ay;

		double ab2 = abx * abx + aby * aby;
		double ap_ab = apx * abx + apy * aby;
		double t = ap_ab / ab2;
		if (clampToSegment) {
			if (t < 0) {
				t = 0;
			} else if (t > 1) {
				t = 1;
			}
		}
		dest.setLocation(ax + abx * t, ay + aby * t);
		return dest;
	}