Question

我的JPanel不会重新绘制，我使用线程从循环调用重绘方法。我100％确定循环工作，但在调用repaint（）时;没有任何反应

package jgame.org.game;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;

import javax.swing.ImageIcon;
import javax.swing.JPanel;

@SuppressWarnings("serial")
public class GamePanel extends JPanel implements Runnable
{   
    @Override
    public void paint(Graphics g)
    {
        if (gameState == 0)
        {
            g.drawImage(new ImageIcon(System.getProperty("user.home")
                    + "/jGame/FruitSlayer/Sprites/splash.png").getImage(), 0,
                    0, null);
        } else
        {
            g.drawImage(new ImageIcon(System.getProperty("user.home")
                    + "/jGame/FruitSlayer/Sprites/white.png").getImage(), 0,
                    0, null);
        }
        System.out.println("REPAINT");
    }

    public int currentLoopTime, gameState;

    @Override
    public void run()
    {
        while (true)
        {
            if (gameState != 1)
            {
                currentLoopTime += 1;
                if (currentLoopTime == 2000)
                {
                    gameState = 1;
                }
            }
            repaint();
        }
    }
}

我的游戏课程：

package jgame.org.game;

import java.awt.Dimension;

import javax.swing.JFrame;

@SuppressWarnings("serial")
public class Game extends JFrame
{
    public Dimension size = new Dimension(605, 625);

    public Game()
    {
        super("Fruit Slayer");
        setSize(size);
        setResizable(false);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setVisible(true);
        (new Thread(new GamePanel())).start();
        add(new GamePanel());
    }

    public static void main(String[] args)
    {
        new Game();
    }

}

REPAINT不在控制台中打印，但是当我将它添加到循环中时，它可以完美地工作。是什么导致它不要调用paint（Graphics）;即使我使用repaint（）; ???

Answer 1

有一些古老的遗迹，没有好主意建造

覆盖public void paintComponent (Graphics g）而不是public void paint(Graphics g) for Swing JPanel
下一行应为super.paint() / super.paintComponent()
不要在Object / paint内加载任何paintComponent，也不要加载FileIO（无论是否来自资源）准备{{1}等等...到局部变量
覆盖Image的{{1}}，否则绘画返回零维度
使用getPreferredSize代替今日JPanel代替Swing Timer

Answer 2

试试这个

public Game()
{
    super("Fruit Slayer");
    setSize(size);
    setResizable(false);
    setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    setVisible(true);
    GamePanel panel = new GamePanel();
    (new Thread(panel)).start();
    setContentPane(panel);
}

JPanel不会重新粉刷

2 个答案: