// 范例P185.cpp : Defines the entry point for the console application.// #include "stdafx.h"#include <gl/glut.h>#include <math.h>#include <conio.h>#include <stdlib.h> #define M_PI 3.1415926 GLuint theTorus; /*绘制一个圆环*/static void torus(int numc,int numt){ int i,j,k; double s,t,x,y,z,twopi;  twopi=2*(double)M_PI; for(i=0;i<numc;i++) {  glBegin(GL_QUAD_STRIP);  for(j=0;j<=numt;j++)  {   for(k=1;k>=0;k--)   {    s=(i+k)%numc+0.5;    t=j%numt;     x=(1+0.1*cos(s*twopi/numc))*cos(t*twopi/numt);    y=(1+0.1*cos(s*twopi/numc))*sin(t*twopi/numt);    z=0.1*sin(s*twopi/numc);    glVertex3f(x,y,z);   }  }  glEnd(); } } /*创建1个存储圆环的显示列表并初始化状态*/static void init(void){ glShadeModel(GL_SMOOTH); glClearColor(0.0,0.0,0.0,0.0);  GLfloat light_diffuse[]={1.0,0.0,0.0,1.0}; GLfloat light_ambient[]={1.0,1.0,1.0,1.0};  GLfloat mat_specular[]={1.0,1.0,1.0,1.0}; GLfloat mat_shininess=100; GLfloat mat_diffuse[]={1.0,1.0,1.0,1.0};  glMaterialf(GL_FRONT_AND_BACK,GL_SHININESS,mat_shininess); glMaterialfv(GL_FRONT_AND_BACK,GL_SPECULAR,mat_specular);  glLightfv(GL_LIGHT0,GL_DIFFUSE,light_diffuse); glLightfv(GL_LIGHT0,GL_AMBIENT,light_ambient);   glEnable(GL_LIGHTING); glEnable(GL_LIGHT0);  glPopMatrix();  theTorus=glGenLists(1); glNewList(theTorus,GL_COMPILE); torus(8,25); glEndList(); } 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*/ glCallList(theTorus); glFlush();          //立即显示出来} void reshape(int w,int h){ glViewport(0,0,(GLsizei)w,(GLsizei)h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(15,(GLfloat)w/(GLfloat)h,1.0,100.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0,0,10,0,0,0,0,1,0);} /*x---绕x轴旋转，y---绕y轴旋转，i---回到观察角*/void keyboard(unsigned char key,int x,int y){ GLfloat light_position[]={1.0,1.0,1.0,0.0}; switch(key){ case 'x': case 'X':  glRotatef(30.0,1.0,0.0,0.0);  glLightfv(GL_LIGHT0,GL_POSITION,light_position);  glutPostRedisplay();  break; case 'y': case 'Y':  glRotatef(30.0,0.0,1.0,0.0);  glutPostRedisplay();  break; case 'i': case 'I':  glLoadIdentity();  gluLookAt(0,0,10,0,0,0,0,1,0);  glutPostRedisplay();  break; case 27:  exit(0);  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); glutKeyboardFunc(keyboard); glutMainLoop();         //进入主循环处理事件 return 0;}

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