BufferStrategy 不起作用 [英] BufferStrategy not working

问题描述

我正在尝试使用 JFrame 和画布为游戏构建简单的 gui.Window 是一个扩展 JFrame 类的类，我使用 fillRect 方法来填充黑色矩形.每次我运行我的程序时，框架窗口都不是黑色，而是默认颜色.我不知道我的代码有什么问题.

I am trying to do build simple gui for a game using JFrame and canvas. Window is a class which extends JFrame class and I am using fillRect method to fill rectangle of black color. Every time I run my program the frame window is not black it is of default color. I don't know what is wrong with my code.

package test1;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import javax.swing.JFrame;

/**
 *
 * @author sabertooth
 */
public class Test1 extends Canvas implements Runnable{

    /**
     * @param args the command line arguments
     */
    private final static int width=600;
    private final static int height=500;

    private Window gui;
    private Thread t;
    private boolean status=false;

    public boolean isStatus() {
        return status;
    }

    public void setStatus(boolean status) {
        this.status = status;
    }


    public int getWidth() {
        return width;
    }

    public int getHeight() {
        return height;
    }


    public static void main(String[] args) {
        // TODO code application logic here
        Dimension d=new Dimension(width,height);
        Test1 mc=new Test1();
        mc.gui=new Window();
        mc.setPreferredSize(d);
        mc.gui.setTitle("Welcome to my game");
        mc.gui.add(mc);
        mc.gui.setLocationRelativeTo(null);
        mc.gui.setVisible(true);
        Test1 t1=new Test1();
        t1.start();

    }

    @Override
    public void run() {
        while(status)
        {
            update();
            render();
        }
    }

    public void render(){

    }

    public void update(){
        BufferStrategy bs=getBufferStrategy();
        if(bs==null)
        {
            createBufferStrategy(3);
            return;
        }
        Graphics g=bs.getDrawGraphics();
        g.setColor(Color.BLACK);
        g.fillRect(0, 0, getWidth(), getHeight());
        g.dispose();
        bs.show();
    }


    public synchronized void start(){

        setStatus(true);
        t=new Thread(this, "Game Thread");
        t.start();
    }
}

推荐答案

你的问题在这里:

Test1 t1=new Test1();
t1.start();

您已经设置了一个名为 mc 的 Test1 并将其添加到您的窗口中.然后创建一个新的 Test1 并告诉新的 Test1 开始更新，即使它没有被添加到任何东西中.

You already have set up a Test1 named mc and added it to your Window. Then you create a new Test1 and tell the new one to start updating, even though it isn't added to anything.

改为启动 mc...

mc.start();

您也可以在此处添加这一行，让窗口在启动时自行展开:

You can also add this line here to have the window expand itself when it starts:

mc.gui.pack();
mc.gui.setVisible(true);//Set it above this line in main()

当我执行上述操作并使用 JFrame 而不是您使用 Window 的地方时，代码会起作用.

The code works when I do the above and use a JFrame instead of where you use Window.

这篇关于BufferStrategy 不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！