首先是環境配置，檔案自己下，具體配置看自己的環境，以下是範例

copyglut.h"C:/Program Files/Microsoft Visual Studio/VC98/Include/GL"

copyglut32.lib"C:/Program Files/Microsoft Visual Studio/VC98/Lib"

copyglut32.dll"C:/WINDOWS/system32"

以下是原始碼

#include <GL/glut.h>

#include <math.h>

#include <stdlib.h>

#include <stdio.h>

#define pi 3.14159265

int n=8;

int R=200,CX=250,CY=250;

int *point;

void initGraph(void);

void drawCircle(int cx, int cy, int r);

void display(void);

void drawLine(int x1, int y1, int x2, int y2);

void main(int argc, char **argv){

     float w,wi;

     glutInit(&argc,argv);

     glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB) ; 

     glutInitWindowSize(500,500);

     glutCreateWindow("n階鑽石圖案");

     initGraph();

point=(int*)malloc(sizeof(int)*n*2);//申請儲存空間

w=2*pi/n;

wi=w/2;

for(int i=0;i<2*n;i+=2){

point[i]=(int)(CX+R*cos(wi));

point[i+1]=(int)(CY+R*sin(wi));

wi+=w;

}

    glutDisplayFunc(display); 

    glutMainLoop();

    if(point!=NULL)free(point);//釋放儲存空間

}

void initGraph (void){

    glClearColor(0.0,0.0,0.0,0.0);

    gluOrtho2D(0.0,500.0,0.0,500.0);//視窗座標左下角(0,0), 右上角(500,500)

}

void display(void){

     glClear(GL_COLOR_BUFFER_BIT) ; 

     glColor3f(1.0, 1.0, 0.0) ; 

     for(int i=0;i<2*n-2;i+=2){

          for(int j=i+2;j<2*n;j+=2){

              drawLine(point[i],point[i+1],point[j],point[j+1]);  

          }

    }

}

void drawLine(int x1, int y1, int x2, int y2) {

    glBegin(GL_LINES);

    glVertex2d(x1, y1);

    glVertex2d(x2, y2);

    glEnd();

    glFlush() ;

}

以下是範例圖片