Kingkazma的部落格

public class MessagePane extends JPanel {

        private static final long serialVersionUID = 1L;
        
        @Override
        protected void paintComponent(final Graphics g) {
                final Graphics2D graphics2D = (Graphics2D) g;
                RenderingHints qualityHints = new RenderingHints(RenderingHints.KEY_ANTIALIASING,
                                RenderingHints.VALUE_ANTIALIAS_ON);
                qualityHints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
                graphics2D.setRenderingHints(qualityHints);
                graphics2D.setPaint(Color.ORANGE);
                int width = getWidth();
                int height = getHeight();
                GeneralPath path = new GeneralPath();
                path.moveTo(0, 0);
                path.lineTo(width, 0);
                path.lineTo(width, height-10);
                path.lineTo(width / 2 + 5, height-10);
                path.lineTo(width / 2, height);
                path.lineTo(width / 2 - 5, height-10);
                path.lineTo(0, height - 10);
                path.closePath();
                graphics2D.fill(path);
                
        }
        
        public static void main(String[] args) {
                JWindow f = new JWindow();
                f.setSize(100, 107);
                f.setLocationRelativeTo(null);
                MessagePane panel = new MessagePane();
                f.add(panel);

                f.setBackground(new Color(0, 0, 0, 0));
                f.setVisible(true);
        }
}