e8_3.java

JAVA 用于绘制五星红旗的Applet小程序

/**
 * @(#)E8_3.java
 *
 * Sample Applet application
 *
 * @author 
 * @version 1.00 09/04/08
 */
 
import java.awt.*; 
import java.applet.*;

public class E8_3 extends Applet {
	
	int[] X(int R,int x0,int y0){
       int x[]=new int[10];
       int r=(int)(Math.sin(Math.PI/10)/Math.sin(3*Math.PI/10)*R);
        for(int i=0; i<10; i++){
      if(i%2==0)
       x[i]=x0+(int)(R*Math.cos(Math.PI/10+(i-1)*Math.PI/5));
      else
       x[i]=x0+(int)(r*Math.cos(Math.PI/10+(i-1)*Math.PI/5));
        }
        return x;
   }
  
   int[] Y(int R,int x0,int y0){
       int y[]=new int[10];
       int r;
       r=(int)(Math.sin(Math.PI/10)/Math.sin(3*Math.PI/10)*R);
        for(int i=0; i<10; i++){
      if(i%2==0)
       y[i]=y0+(int)(R*Math.sin(Math.PI/10+(i-1)*Math.PI/5));
      else
       y[i]=y0+(int)(r*Math.sin(Math.PI/10+(i-1)*Math.PI/5));
        }
        return y;
   }
  
	public void init() {
	}

	public void paint(Graphics g) {
		g.setColor(Color.red);
		g.fillRect(40,20,250,160);
		int x[]=new int[10];
       int y[]=new int[10];
       
       g.setColor(Color.YELLOW);
      
       x=X(20,70,60);
       y=Y(20,70,60);
       g.fillPolygon(x,y,10);
          
       x=X(8,105,35);
       y=Y(8,105,35);
       g.fillPolygon(x,y,10);
      
       x=X(8,115,50);
       y=Y(8,115,50);
       g.fillPolygon(x,y,10);
      
       x=X(8,115,70);
       y=Y(8,115,70);
       g.fillPolygon(x,y,10);
      
       x=X(8,105,85);
       y=Y(8,105,85);
       g.fillPolygon(x,y,10);

	}
}