@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
shape.draw(g2, new Point(getWidth() / 2, getHeight() / 2));
}
public String getShapeId() {
return shape.getClass().getName();
}