java - 使用 ActionListener 清除 JPanel 中的图形

Question

我的问题是，如何使用 Action 监听器清除图形并通过再次运行 OtherPanel 来创建一组新图形？

public class MainFrame extends JFrame
  {

   private OtherPanel panel;

       public MainFrame()
   {

        panel = new OtherPanel();
       }

   class OtherPanel extends JPanel 
   {
      private OtherPanel()
      {
    ...

      }

      public void paintComponent(Graphics g) {
          super.paintComponent(g);

          Graphics2D g2d = (Graphics2D) g;            
              ....

          }

      private class ReloadListener implements ActionListener
   {
      public void actionPerformed(ActionEvent e)
      {
           }
        }

    }

Answer 1

class OtherPanel extends JPanel 
{
    private boolean isReset;

    private OtherPanel()
    {
    ...
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        if(!isReset){
            //your painting code here
        }
    }

    public void setReset(boolean reset){
        isReset = reset;
    }

    private class ReloadListener implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            setReset(true);
            repaint();
        }

    }
}

一切都取决于“重置”面板的外观。我只留下了 super.paintComponent() 作为默认外观，您可能想要更改它。当您想在面板上绘制某些内容时，请不要忘记将 setReset(false) 添加到代码中的某个位置。