#include "stdafx.h"

 #include <GL/glut.h>

 #include <stdlib.h>

 #include <math.h>

 #include <stdio.h>

 using namespace std;

 void myDisplay(void){

     glClear(GL_COLOR_BUFFER_BIT);

     //glRectf(-0.5f, -0.5f, 0.5f, 0.5f);     

     glBegin(GL_LINES);

     glVertex2f(-0.5f, -0.5f);        //直线起始坐标

     glVertex2f(0.5f, 0.5f);         //直线结束坐标

     glEnd();

     glBegin(GL_LINES);

     glVertex2f(-0.5f, 0.5f);

     glVertex2f(0.5f, -0.5f);

     glEnd();

     glBegin(GL_LINES);

     glVertex2f(-0.5f, 0.5f);

     glVertex2f(-0.5f, -0.5f);

     glEnd();

     glBegin(GL_LINES);

     glVertex2f(0.5f, 0.5f);

     glVertex2f(0.5f, -0.5f);

     glEnd();

     glBegin(GL_LINES);

     glVertex2f(-0.5f, 0.5f);

     glVertex2f(0.5f, 0.5f);

     glEnd();

     glBegin(GL_LINES);

     glVertex2f(-0.5f, -0.5f);

     glVertex2f(-0.5f, 0.5f);

     glEnd();

     glBegin(GL_LINES);

     glVertex2f(, 0.5f);

     glVertex2f(, -0.5f);

     glEnd();

     glBegin(GL_LINES);

     glVertex2f(-0.5f, -0.5f);

     glVertex2f(0.5, -0.5f);

     glEnd();

     glBegin(GL_LINES);

     glVertex2f(-0.5f, );

     glVertex2f(0.5, );

     glEnd();

     glFlush();

 }

 int main(int argc, char *argv[]) {

     glutInit(&argc, argv);

     glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);

     glutInitWindowPosition(, );

     glutInitWindowSize(, );

     glutCreateWindow("第一个 OpenGL 程序");

     glutDisplayFunc(&myDisplay);

     glutMainLoop();

     return ;

 }