Java小程序线程动画 [英] Java Applet Thread Animation

问题描述

我通过一些code Java Applet和动画的走了，我写了下面的code：

I am gone through some of code java applet and animation, i write the following code :

import java.applet.*;
import java.awt.*;

/*<applet code="AppletDemo" width = 200 height = 100></applet>
*/

public class AppletDemo extends Applet implements Runnable
{
    String msg = "Text Animating from right to left...";
    Thread t = null;
    int state;
    boolean stopFlag;
    int msgX = 200;
    String s;
    boolean diff;

    public void init()
    {
        setBackground(Color.cyan);
        setForeground(Color.black);
    }
    public void start()
    {
        t = new Thread(this);
        stopFlag = false;
        t.start();
        s = "abc";
         diff = s.equalsIgnoreCase("abc");
    }

    public void run()
    {
        while (true)
        {
            try{
            if(msgX>=-150)
                msgX--;
            else
                msgX =200;

            Thread.sleep(10);
            repaint();
               }
               catch(Exception e)
               {}
        }
    }
    public void paint(Graphics g)
    {
        g.drawString(msg,msgX,20);
        showStatus(diff+"Text at "+msgX+",20");
    }

}

正在发生的事情是，当我把视频下载（100），它工作正常，但是当我尝试更快的动画是视频下载（10），它开始闪烁，我不明白发生了什么事谁能帮助。

What is happening is that when i put Thread.sleep(100), it works fine but when i try to animate faster that is Thread.sleep(10) it starts flickering , i couldn't understand what is happening can anyone help.

推荐答案

• 请不要在顶层容器直接作画。使用的JP​​anel 画就可以了。


• 请不要使用视频下载（）。这是更好地使用秋千定时器动画。


• 覆盖的paintComponent（）定制油画的JP​​anel 的方法。


• 请不要忘记调用 super.paintComponent方法（）内覆盖的paintComponent 方法。

• Don't directly paint over top level container. Use JPanel to paint on it.
• Don't use Thread.sleep(). It's better to use Swing Timer for animation.
• Override paintComponent() method of JPanel for custom painting.
• Don't forget to call super.paintComponent() inside overridden paintComponent method.

而不是无限循环使用摇摆定时器

请看看如何使用Swing计时器

样code：

import java.applet.Applet;
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.JPanel;
import javax.swing.Timer;

/*
 * <applet code="AppletDemo" width = 200 height = 100></applet>
 */

public class AppletDemo extends Applet {
    String msg = "Text Animating from right to left...";
    int state;
    boolean stopFlag;
    int msgX = 200;
    String s;
    boolean diff;
    JPanel panel;

    public void init() {
        setBackground(Color.cyan);
        setForeground(Color.black);
        panel = new JPanel() {
            @Override
            public void paintComponent(Graphics g) {
                super.paintComponents(g);
                g.drawString(msg, msgX, 20);
                showStatus(diff + "Text at " + msgX + ",20");
            }

            @Override
            public Dimension getPreferredSize() {
                return new Dimension(200, 40);
            }
        };
        add(panel);

        int delay = 10; // milliseconds
        ActionListener taskPerformer = new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                if (msgX >= -150)
                    msgX--;
                else
                    msgX = 200;
                repaint();
            }
        };
        Timer timer = new Timer(delay, taskPerformer);
        timer.setRepeats(true);
        timer.start();
    }

}



查找样品code这里



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