opengl画五角星,每帧十个

#include <windows.h>

#include <gl/gl.h>
#include <gl/glaux.h>

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
//添加这3条语句
#pragma comment (lib, "opengl32.lib")  
#pragma comment (lib, "glu32.lib")  
#pragma comment (lib, "glaux.lib")  

//#pragma comment( linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"" ) //这句是不让控制台窗体出现，如果想要出现，去掉即可。

void init()
{
      glClearColor(0.0,0.0,0.0,1.0);//黑色背景
}

//绘制图形函数
float base = 2*3.14/5;


void start(float angle,float r,float g,float b,float R1,float R2,float x,float y)
{
	 glColor3f(r,g,b); //红色
     glBegin(GL_LINE_LOOP);//线段
	 int i;
	    for(i=0;i<5;i++)
		{
		   float a1 = cos(angle+base*i);
		   float a2 = sin(angle+base*i);
		   float b1 = cos(base/2.0+angle+base*i);
		   float b2 = sin(base/2.0+angle+base*i);
		   glVertex2f(x+R1*a1,y+R1*a2);
		   glVertex2f(x+R2*b1,y+R2*b2);
		}  
     glEnd();

 //    glFinish();//强制之前的绘图函数执行

	   

}
void CALLBACK draw()
{
       glClear(GL_COLOR_BUFFER_BIT);
        int j;
	    float angle = -1;
        float r,g,b,R1,R2;
		int x,y;
		srand(time(NULL)); //srand(int)来设种子
	    for(j=0;j<10;j++)
		{
	
	  
           int i; 
		  
	      
	       i=rand()%400+1;/* i是[1，200]区间内的一个整数 */
           x = i;
       	   i=rand()%400+1;
    	   y = i;

    	   i=rand()%200;
    	   r = i / 200.0f;
   
    	   i=rand()%200;
    	   g = i / 200.0f;

    	   i=rand()%200;
    	   b = i / 200.0f;

           i=rand()%20;
           R1 = i+ 40;
           i=rand()%10;
           R2 = i+ 10;
    	   i=rand()%628;
           angle = i/100.0;
		  // system("pause");
           start(angle,r,g,b,R1,R2,x,y);
	        printf("%d,%d\n",x,y);
	
		}
 glFinish();
}

void CALLBACK change()
{
	  
	  draw();
}

//主函数
void main()
{
    auxInitDisplayMode(AUX_SINGLE|AUX_RGBA);
    auxInitPosition(100,100,500,500);
    auxInitWindow("CGOpenGL");

    init();
	auxIdleFunc(change);//一定要在auxMainLoop前面
    auxMainLoop(draw);	
}