wjx.java

显示各种五角星,自己动运行。。可以做一个页面

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

public class Wjx extends java.applet.Applet implements Runnable{
    Thread PaintThread;
    public void init() {        
    }
    public void start(){
        PaintThread=new Thread(this);
        PaintThread.start();
    }
    public void stop(){
        PaintThread=null;
    }
    public void paint(Graphics g){
        //变量定义及初始化
        int x[], y[], ox, oy, i, j, R, r, w, h;
        double a, inca, cura;
        Color c;
        int cr, cg, cb;
        
        inca=2 * Math.PI / 5;
        x=new int[10];
        y=new int[10];
        w=getSize().width;
        h=getSize().height;
        
        //五角星
        for (i=0; i<50; i++){
            
            //随机五角星特征
            ox=(int)(Math.random() * w);
            oy=(int)(Math.random() * w);
            R=(int)(Math.random() * 50);
            r=(int)(R / 2);
            a=(int)(Math.random() * 2 * Math.PI / 5);
            
            //计算顶点数据
            for(j=0; j<10; j+=2){
                cura=a + inca * (j / 2);
                x[j]=ox + (int)(R * Math.sin(cura));
                y[j]=oy + (int)(R * Math.cos(cura));
                
                cura=cura + inca / 2;
                x[j+1]=ox + (int)(r * Math.sin(cura));
                y[j+1]=oy + (int)(r * Math.cos(cura));
            }
            
            cr=(int)(Math.random() * 255);
            cg=(int)(Math.random() * 255);
            cb=(int)(Math.random() * 255);
            c=new Color(cr, cg, cb);
            
            //画出五角星
            g.setColor(c);
            g.fillPolygon(x, y, 10);

        }
    }
    public void run() {
        while(PaintThread!=null){
            repaint();
            try{
                Thread.sleep(125);
            }
            catch(InterruptedException E){ }
        }
    }
}