}
public void testScale() {
Line2D l = new Line2D(new Vec2D(200, 200), new Vec2D(100, 100));
float len = l.getLength();
l.scaleLength(0.9f);
assertEquals(0.9f * len, l.getLength());
l = new Line2D(new Vec2D(100, 200), new Vec2D(200, 100));
len = l.getLength();
l.scaleLength(3f);
assertEquals(3f * len, l.getLength());