计算机图形学--旋转变换(java)

import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.*;

public class Rotates extends Frame {
    public void lanch() {
        this.setSize(640, 480);
        this.setVisible(true);
         this.addWindowListener(new MyWindowMonitor());
        

    }
    class MyWindowMonitor extends WindowAdapter {
          public void windowClosing(WindowEvent e) {
           setVisible(false);
           System.exit(0);
          }
         }


    public void paint(Graphics g) {
                g.translate(320, 240);
               int[] A={0,0,20};
              int[] B={0,100,50};
             
           for(int n=0;n<720;n+=40){
             double[][]  r={    {Math.cos(n*3.14/180),Math.sin(n*3.14/180),0},
                                {-Math.sin(n*3.14/180),Math.cos(n*3.14/180),0},
                                {0,                    0,                     1}
                            };
             
             int[][]  a;
             a=new int[][]{{0,0,1},{0,100,1},{20,50,1}};
             if(n>=360){
                  a=new int[][]{{0,0,1},{0,100,1},{-20,50,1}};
             }
             int[][] zz;
             zz=new int[3][3];
             
             for(int i=0;i<3;i++){
                   for(int j=0;j<3;j++){
                       for(int k=0;k<3;k++){
                            zz[i][j]+=a[i][k]*r[k][j];
                       }
                   }
               }
           
             int[] aa=new int[3];
             int[] bb=new int[3];
            for(int i=0;i<3;i++){
                
                    aa[i]=(int)zz[i][0];
                bb[i]=(int)zz[i][1];
            
            }
             
             
             
            if(n>=360){
                try {
                    Thread.sleep(1000);//延时函数
            } catch (InterruptedException e) {
                    e.printStackTrace();
            }
               g.setColor(Color.red);
                
                g.fillPolygon(aa, bb,3);
            }else{
                try {
                    Thread.sleep(1000);//延时函数
            } catch (InterruptedException e) {
                    e.printStackTrace();
            }
                g.setColor(Color.BLUE);
                
                g.fillPolygon(aa, bb, 3);
                }
           }

    }

    public static void main(String[] args) {
        new Rotates().lanch();

    }

}