小编dem*_*oth的帖子

我的目标是将一些bufferedimage绘制到另一个上.然后所有这些东西吸引到其他一些bufferedimage等等.最后在面板上绘制它.现在我正试图在面板上绘制bufferedimage,没有任何效果.我的bufferedimage看起来完全是白色的:

public class Main2 {
    public static void main(String[] args) {
        JFrame frame = new JFrame("asdf");
        final JPanel panel = (JPanel) frame.getContentPane();
        frame.setSize(500,500);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        panel.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                somepaint(panel);
            }
        });
    }

    private static void somepaint(JPanel panel) {
        BufferedImage image = new BufferedImage(200,200,BufferedImage.TYPE_INT_ARGB);
        image.getGraphics().setColor(Color.red);
        image.getGraphics().fillRect(0, 0, 200, 200);

        Graphics2D graphics = (Graphics2D) panel.getGraphics();
        graphics.setColor(Color.magenta);
        graphics.fillRect(0, 0, 500, 500);
        graphics.drawImage(image, null, 0, 0); // draws white square instead of red one
    }
}

谢谢