// 范例P98.cpp : Defines the entry point for the console application.// #include "stdafx.h"#include <gl/glut.h> static float year=0,day=0; 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*/  glPushMatrix(); glutWireSphere(1.0,20,16);      //绘制太阳 glRotatef((GLfloat)year,0,1,0);     //绕y轴旋转表示确定公转位置 glTranslatef(2,0,0);       //平移到公转轨道 glRotatef((GLfloat)day,0,1,0);     //绕y轴表示自转 glutWireSphere(0.2,10,8); glPopMatrix(); glutSwapBuffers();          //立即显示出来} void init(){ glClearColor(0.0,0.0,0.0,0.0);     //用黑色清除背景 glShadeModel(GL_FLAT);}void reshape(int w,int h){ glViewport(0,0,(GLsizei)w,(GLsizei)h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(60,(GLfloat)w/(GLfloat)h,1.0,20.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0,0,5, 0,0,0, 0,1,0); glRotatef(45,1,0,0);}void spinDisplay(void){ day=day+1; year=year+1.0/365; if(day>360)  day-=360; if(year>360)  year-=360; glutPostRedisplay();}void mouse(int button,int state,int x,int y){ switch(button){ case GLUT_LEFT_BUTTON:  if(state==GLUT_DOWN)   glutIdleFunc(spinDisplay);  break; case GLUT_MIDDLE_BUTTON:  if(state==GLUT_DOWN)   glutIdleFunc(0);  break; default:  break; }}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(0,0);    //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 glutReshapeFunc(reshape); glutMouseFunc(mouse); glutMainLoop();         //进入主循环处理事件 return 0;}

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