void drawArrow(Point from, Point to, int width, int height) { final double w = vp.get().invScale(width); final double h = vp.get().invScale(height); final Point left = PointUtil.perp(to, from, h, w / 2d); final Point right = PointUtil.perp(to, from, h, -w / 2d); drawLine(from, PointUtil.on(from, to, h)); fillPolygon(left, right, to); }