add(.9, .9);
add(1, Double.NaN);
CountingGraphics g = paint();
assertEquals(8, g.getPointCount());
LineChecker c = new LineChecker();
c.require(19, 200, 19, 180);
c.require(19, 180, 39, 160);
c.require(39, 160, 39, 100);
c.require(159, 100, 159, 40);
c.require(159, 40, 179, 20);
c.require(179, 20, 179, 0);
c.check(g.getLines());
}