public void paint(Graphics g) {
        if (offScreenGraphics == null) {
            offScreenImage = createImage(size().width, size().height);
            offScreenGraphics = offScreenImage.getGraphics();
        }

        offScreenGraphics.setColor(getBackground());
        offScreenGraphics.fillRect(0, 0, size().width, size().height);

        drawCurves(offScreenGraphics);
        drawMarks(offScreenGraphics);
        drawStrings(offScreenGraphics);
        drawInstruction(offScreenGraphics);

        g.drawImage(offScreenImage, 0, 0, this);
    }