gann-cdf / graphics

public abstract class ShapeTest extends AppWindow {

    protected Drawable shape;

    protected double dx, dy, width, height;

    @Override

    protected void setup() {

        width = getDrawingPanel().getWidth() / 3.0;

        height = getDrawingPanel().getHeight() / 3.0;

        double heading = Math.random() * Math.PI * 2.0;

        dx = Math.cos(heading);

        dy = Math.sin(heading);

    }

    @Override

    protected void loop() {

        shape.translate(dx, dy);

        if (shape.getX() < 0 || shape.getX() + shape.getWidth() > getDrawingPanel().getWidth()) {

            dx = -dx;

        }

        if (shape.getY() < 0 || shape.getY() + shape.getHeight() > getDrawingPanel().getHeight()) {

            dy = -dy;

        }

        sleep(10);