想做个会飞动的椭圆但是不见效果

最新推荐文章于 2024-04-28 17:09:33 发布

原创最新推荐文章于 2024-04-28 17:09:33 发布 · 737 阅读

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CC 4.0 BY-SA版权

文章标签：

#thread #import #applet #class #null

本文介绍了一个使用Java Applet实现的旋转椭圆示例程序。该程序通过`Ellipse2D`类创建椭圆，并利用`AffineTransform`进行旋转操作。通过双缓冲技术减少闪烁，实现了流畅的动画效果。

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import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*; //包含有Graphics2D类这个类（画笔）可以设置旋转
public class Ellipse extends Applet implements Runnable
{
int AppletWidth,AppletHeight;
Ellipse2D E2D; //椭圆画笔
AffineTransform tans; //用于旋转
Thread thread;
Image OffScreen;//子画面把子画面放在主画面上可以消去闪烁缺点
Graphics2D drawOffScreen;

public void inint()
{
  this.setBackground(Color.black);
  AppletWidth=getSize().width;
  AppletHeight=getSize().height;
  E2D=new Ellipse2D.Double(30,30,80,30);
  tans=new AffineTransform();
  OffScreen=createImage(AppletWidth,AppletHeight);
  drawOffScreen=(Graphics2D)OffScreen.getGraphics();
}
public void start()
{
  thread=new Thread(this);
  thread.start();
}
public void stop()
{
  thread=null;
}
public void update(Graphics g)
{
  paint(g);
}
public void paint(Graphics g)
{
  g.drawImage(OffScreen, 0, 0, this);
}
public void run()
{
  while(true)
  {
   drawOffScreen.clearRect(0, 0, AppletWidth, AppletHeight);
   drawOffScreen.setColor(Color.white);
   tans.rotate(15.0*Math.PI/180, 70, 45);
   drawOffScreen.setTransform(tans);
   drawOffScreen.draw(E2D);

   repaint();
   try{
    Thread.sleep(33);
   }
   catch(InterruptedException e){}
  }
}