用鼠标点击多次在JPanel上绘制图像

Question

我在点击特定按钮时尝试在JPanel上绘制图像。当按下带圆圈的按钮时，我应该可以绘制圆形图像，类似于矩形按钮。我只能绘制一次，这意味着先前绘制的图像被删除。

public class Panel1 extends JPanel {

    Image image;
    Image image2;
    private Point drawPoint;

    public Panel1(){
        Toolkit toolkit = Toolkit.getDefaultToolkit();
        image = toolkit.getImage("JavaIcon\\p3.png");
        image2 = toolkit.getImage("JavaIcon\\t.png");

        addMouseListener(new MouseAdapter() {

            @Override
            public void mouseClicked(MouseEvent e) {
                drawPoint = new Point(e.getPoint());
                repaint();
            }

        });

    }

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();
        if (drawPoint != null) {
            if(i==1){
                g2d.drawImage(image, drawPoint.x, drawPoint.y, this);
            }
            if(i==2){
                g2d.drawImage(image2, drawPoint.x, drawPoint.y, this);
            }
        }
        g2d.dispose();
    }
}

在“if语句”中，我指示是否单击某个按钮，如果为1，则单击一个圆形按钮。

最新编辑

它仍然会删除之前绘制的圆圈：

ArrayList<drawnCircle> list1 = new ArrayList<drawnCircle>();

public void addCircle(Image image, Point point){

        Toolkit toolkit = Toolkit.getDefaultToolkit(); 
        image = toolkit.getImage("JavaIcon\\p3.png");

        drawnCircle dc = new drawnCircle(image, point);
        list1.add(dc);
        repaint();
    }
    public void clear(){
        list1.clear();
        repaint();
    }

    class drawnCircle{
        private Image image;
        private Point point;

        public drawnCircle(Image image, Point myPoint){
            this.image = image;
            this.point = myPoint;
        }
        public Image getImage(){
            return image;
        }

        public void setImage(Image image){
            this.image = image;
        }
        public Point getPoint(){
            return point;
        }
    }