// 范例P12.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <gl/glut.h>

void display()
{
 glClear(GL_COLOR_BUFFER_BIT);        //清除所有像素
 glColor3f(1.0,1.0,1.0);       //设置画笔白色
 /*在缓存中绘制4对顶点坐标的矩形*/
 glBegin(GL_POLYGON);
  glVertex3f(0.25,0.25,0);
  glVertex3f(0.75,0.25,0);
  glVertex3f(0.75,0.75,0);
  glVertex3f(0.25,0.75,0);
 glEnd();
 glFlush();          //立即显示出来
}

void init()
{
 glClearColor(0.0,0.0,0.0,0.0);     //用黑色清除背景
 /*初始化视景体*/
 glMatrixMode(GL_PROJECTION);
 glLoadIdentity();
 glOrtho(0.0,1.0,0.0,1.0,-1.0,1.0);
}

int main(int argc,char ** argv)
{
 glutInit(&argc,argv);
 glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
 glutInitWindowSize(250,250);     //初始化窗口大小
 glutInitWindowPosition(100,100);    //初始化窗口位置
 glutCreateWindow("hello");      //创建标题为“hello”的窗口
 init();           //调用初始化函数
 glutDisplayFunc(display);      //注册回调函数
 glutMainLoop();         //进入主循环处理事件
 return 0;
}

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