public void paint(Graphics g) { g.setColor(Color.WHITE); g.fillRect(0, 0, width, height); g.setColor(Color.black); if (funct == null) { g.drawString("No function is available.", 20, 30); } else { if (Expr) g.drawString("y = " + funct.getDefinition(), 5, 15); drawAxes(g); drawFunction(g); } }