// 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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