为什么背景色不会用repaint(e)填充？

Question

所以我不确定重绘方法有什么问题。它不会填充新的背景颜色。每当我尝试调试它时，它似乎都没有在该方法中打印出文本。我有 3 个 classes：GameInterface、Renderer 和 RepaintConfiguration。 RepaintConfiguration 扩展自 GameInterface class 并实现 ActionListener。

public class GameInterface {

public static GameInterface gameInterface;   

public static JFrame jframe;

private String title;

private Container container;

public GameInterface() {
    gameInterface = this;
    jframe = new JFrame();
    jframe.setSize(1500, 800);
    jframe.setResizable(false);
    jframe.setTitle("Jetpack");
   
    jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    jframe.setVisible(true);
  } 
}
   

public class Renderer extends JPanel {

  
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        RepaintConfiguration.repaintConfiguration.repaint(g);
      }
}


public class RepaintConfiguration extends GameInterface implements ActionListener
{

    public static RepaintConfiguration repaintConfiguration;
    public static Renderer renderer;
   
    public static GameInterface gameInterface;
    

    public RepaintConfiguration() {
        super();
        repaintConfiguration = this;
        renderer = new Renderer();
        super.jframe.add(renderer);
   
        
        
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        renderer.repaint();
    }
    
    
    
    public void repaint(Graphics g) {
        g.setColor(Color.red);
        g.fillRect(0, 0, 1500, 800);
    }

    
}

Answer 1

我设法编译了你的代码运行。 Public 类必须是内部类.

我添加了一个main方法。我添加了对 SwingUtilities invokeLater 方法的调用。此方法确保在 Event Dispatch Thread.

上创建和执行 Swing 组件

我重新排序了 JFrame 方法调用。 JFrame 方法必须按特定顺序调用。这是我用于所有 Swing 应用程序的顺序。

您没有调整 JFrame 的大小。您调整绘图的尺寸 JPanel。 JFrame 包含占用一些 space 的装饰。

我留下了你费解的绘图代码。您将很难扩展此代码以实际创建游戏。

这是完整的运行可用代码。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class GameInterface {

    private JFrame jframe;

    private Renderer renderer;

    private RepaintConfiguration repaintConfiguration;
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new GameInterface();
            }
        });
    }

    public GameInterface() {
        this.repaintConfiguration = new RepaintConfiguration(this);

        jframe = new JFrame();
        jframe.setTitle("Jetpack");
        jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jframe.setResizable(false);

        this.renderer = new Renderer(repaintConfiguration);
        jframe.add(renderer, BorderLayout.CENTER);

        jframe.pack();
        jframe.setLocationByPlatform(true);
        jframe.setVisible(true);
    }

    public Renderer getRenderer() {
        return renderer;
    }

    public class Renderer extends JPanel {

        private static final long serialVersionUID = 1L;
        
        private RepaintConfiguration repaintConfiguration;

        public Renderer(RepaintConfiguration repaintConfiguration) {
            this.repaintConfiguration = repaintConfiguration;
            this.setPreferredSize(new Dimension(1500, 800));
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            repaintConfiguration.repaint(g);
        }
    }

    public class RepaintConfiguration implements ActionListener {

        private GameInterface gameInterface;

        public RepaintConfiguration(GameInterface gameInterface) {
            this.gameInterface = gameInterface;
        }

        @Override
        public void actionPerformed(ActionEvent event) {
            gameInterface.getRenderer().repaint();
        }

        public void repaint(Graphics g) {
            g.setColor(Color.red);
            g.fillRect(0, 0, 1500, 800);
        }

    }

}

为什么背景色不会用repaint(e)填充？

Why won't the background color be filled with repaint(e)?

java

swing

repaint