如何阻止小程序闪烁？

Question

我一直在尝试将我的一个游戏转换为 Applet，但由于这是我第一次使用 Applet，我遇到了问题。基本上每当我打开游戏时，屏幕就会开始闪烁。我很确定这是因为没有 BufferStrategy，但是每当我尝试创建像“BufferStrategy bg = this.getBufferStrategy()”这样的一个时，它就不起作用。有人可以帮忙吗？

package main;

import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JApplet;

import Handling.Handler;
import Other.HUD;
import Other.KeyInput;


public class Game  extends JApplet implements Runnable{

    private static final long serialVersionUID = 9021342660060318393L;

    public static final int WIDTH = 640;
    public static final int HEIGHT = WIDTH / 12 * 9;

    private Thread thread;
    private boolean running = false;

    private Handler handler;
    private HUD hud;
    private Spawner spawner;
    private Menu menu;

    public enum STATE{
        Menu(),
        Help(),
        Settings(),
        DeathScreen(),
        Game();
    };

    public enum DIFFICULTY{
        Easy(),
        Mediuм(),
        Hard();
    };

    public STATE GameState = STATE.Menu;
    public DIFFICULTY difficulty = DIFFICULTY.Easy;







    private void tick(){
        handler.tick();
        if(GameState == STATE.Game){
            hud.tick();
            spawner.tick();
        }else if(GameState == STATE.Menu){
            menu.tick();
        }
    }

    public void paint(Graphics g){

        //DRAW HERE
        g.setColor(Color.black);
        g.fillRect(0, 0, WIDTH, HEIGHT);

        handler.paint(g);

        if(GameState == STATE.Game){
            hud.paint(g);
        }else if(GameState == STATE.Menu || GameState == STATE.Help || GameState == STATE.Settings || GameState == STATE.DeathScreen){
            menu.paint(g);
        }
        //STOP DRAWING

        g.dispose();
    }








    public void init(){
        setSize(WIDTH,HEIGHT);

        handler = new Handler();
        menu = new Menu(this, handler);
        this.requestFocusInWindow(true);
        this.setFocusable(true);
        this.addKeyListener(new KeyInput(handler));
        this.addMouseListener(menu);
        hud = new HUD();
        spawner = new Spawner(handler, hud, this);
    }

    public void start(){
        thread = new Thread(this);
        thread.start();
        running = true;
    }

    public void destroy(){}

    public void stop(){
        try {
            System.exit(1);
            thread.join();
            running = false;
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }

    public void run() {
        this.requestFocus();
        long LastTime = System.nanoTime();
        double amountOfTicks = 60.0;
        double ns = 1000000000 / amountOfTicks;
        double delta = 0;
        long timer = System.currentTimeMillis();
        int frames = 0;
        while(running){
            long now = System.nanoTime();
            delta += (now - LastTime) / ns;
            LastTime = now;
            while(delta >= 1){
                tick();
                repaint();
                delta--;
            }
            frames++;

            if(System.currentTimeMillis() - timer > 1000){
                timer += 1000;
                System.out.println("FPS: " + frames);
                frames = 0;
            }
            try {
                thread.sleep(20);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        stop();
    }

}

Answer 1

不要调用repaint()，而是尝试调用

paint(getGraphics()). 

另外，将此方法添加到您的小程序中：

public void update(java.awt.Graphics g) {}