VS2012下基于Glut OpenGL显示一些立体图形示例程序：

Glut下提供了一些现成的绘制立体的API，如glutWireSphere绘制球，glutWireCone绘制椎体，glutWireCube绘制立体，glutWireTorus绘制甜圈，glutWireTeapot绘制茶壶，glutWireOctahedron绘制八面体。

Demo程序利用这些API绘制相应的立体，单击鼠标右键在弹出的菜单里可以选择需要绘制的立体以及是wire还是solid填充的，按键盘的UP、DOWN、LEFT、RIGHT按键可以旋转坐标系。由于Glut提供的多面体API默认半径是1.0f的，我使用glScalef对其进行了放大。示例效果如下：







源代码：

// GlutDemo.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <gl/glut.h>
#include <math.h>
//圆周率宏
#define GL_PI 3.1415f
//获取屏幕的宽度
GLint SCREEN_WIDTH=0;
GLint SCREEN_HEIGHT=0;
//设置程序的窗口大小
GLint windowWidth=400;
GLint windowHeight=300;
//绕x轴旋转角度
GLfloat xRotAngle=0.0f;
//绕y轴旋转角度
GLfloat yRotAngle=0.0f;
//受支持的点大小范围
GLfloat sizes[2];
//受支持的点大小增量
GLfloat step;

enum MODELS{
SPHERE=0,
CONE,
CUBE,
TORUS,
DODECAHEDRON,
TEAPOT,
OCTAHEDRON,
TETRAHEDRON,
ICOSAHEDRON
};
GLint iModel=SPHERE;
GLboolean bWire=GL_TRUE;
//菜单回调函数
void processMenu(int value){
switch(value){
case 1:
iModel=SPHERE;
break;
case 2:
iModel=CONE;
break;
case 3:
iModel=CUBE;
break;
case 4:
iModel=TORUS;
break;
case 5:
iModel=DODECAHEDRON;
break;
case 6:
iModel=TEAPOT;
break;
case 7:
iModel=OCTAHEDRON;
break;
case 8:
iModel=TETRAHEDRON;
break;
case 9:
iModel=ICOSAHEDRON;
break;
case 10:
bWire=GL_TRUE;
break;
case 11:
bWire=GL_FALSE;
break;
default:
break;
}
//重新绘制
glutPostRedisplay();
}
//显示回调函数
void renderScreen(void){
//将窗口颜色清理为黑色
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
//将模板缓冲区值全部清理为1
glClearStencil(1);
//使能模板缓冲区
glEnable(GL_STENCIL_TEST);
//把整个窗口清理为当前清理颜色：黑色。清除深度缓冲区、模板缓冲区
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);
//将当前Matrix状态入栈
glPushMatrix();
//坐标系绕x轴旋转xRotAngle
glRotatef(xRotAngle,1.0f,0.0f,0.0f);
//坐标系绕y轴旋转yRotAngle
glRotatef(yRotAngle,0.0f,1.0f,0.0f);
//进行平滑处理　
glEnable(GL_POINT_SMOOTH);
glHint(GL_POINT_SMOOTH,GL_NICEST);
glEnable(GL_LINE_SMOOTH);
glHint(GL_LINE_SMOOTH,GL_NICEST);
glEnable(GL_POLYGON_SMOOTH);
glHint(GL_POLYGON_SMOOTH,GL_NICEST);

//白色绘制坐标系
glColor3f(1.0f,1.0f,1.0f);
glBegin(GL_LINES);
glVertex3f(-9.0f,0.0f,0.0f);
glVertex3f(9.0f,0.0f,0.0f);
glVertex3f(0.0f,-9.0f,0.0f);
glVertex3f(0.0f,9.0f,0.0f);
glVertex3f(0.0f,0.0f,-9.0f);
glVertex3f(0.0f,0.0f,9.0f);
glEnd();

glPushMatrix();
glTranslatef(9.0f,0.0f,0.0f);
glRotatef(90.0f,0.0f,1.0f,0.0f);
glutSolidCone(0.3,0.6,10,10);
glPopMatrix();

glPushMatrix();
glTranslatef(0.0f,9.0f,0.0f);
glRotatef(-90.0f,1.0f,0.0f,0.0f);
glutSolidCone(0.3,0.6,10,10);
glPopMatrix();

glPushMatrix();
glTranslatef(0.0f,0.0f,9.0f);
glRotatef(90.0f,0.0f,0.0f,1.0f);
glutSolidCone(0.3,0.6,10,10);
glPopMatrix();

//设置绘画颜色为金色
glColor3f(0.0f,1.0f,0.0f);
switch(iModel){
//球
case SPHERE:
if(bWire){
glutWireSphere(8.0f,20,20);
}
else{
glutSolidSphere(8.0f,20,20);
}
break;
//锥体
case CONE:
if(bWire){
glutWireCone(4.0f,8.0f,20,20);
}
else{
glutSolidCone(4.0f,8.0f,20,20);
}
break;
//立体
case CUBE:
if(bWire){
glutWireCube(8.0f);
}
else{
glutSolidCube(8.0f);
}
break;
//甜圈
case TORUS:
if(bWire){
glutWireTorus(3.0f,6.0f,20,20);
}
else{
glutSolidTorus(3.0f,6.0f,20,20);
}
break;
//十六面体，默认半径1.0
case DODECAHEDRON:
glScalef(6.0f,6.0f,6.0f);//x,y,z轴均放大6倍
if(bWire){
glutWireDodecahedron();
}
else{
glutSolidDodecahedron();
}
break;
//茶壶
case TEAPOT:
if(bWire){
glutWireTeapot(8.0f);
}
else{
glutSolidTeapot(8.0f);
}
break;
//八面体，默认半径1.0
case OCTAHEDRON:
glScalef(6.0f,6.0f,6.0f);//x,y,z轴均放大6倍
if(bWire){
glutWireOctahedron();
}
else{
glutSolidOctahedron();
}
break;
//四面体，默认半径1.0
case TETRAHEDRON:
glScalef(6.0f,6.0f,6.0f);//x,y,z轴均放大6倍
if(bWire){
glutWireTetrahedron();
}
else{
glutSolidTetrahedron();
}
break;
//二十面体，默认半径1.0
case ICOSAHEDRON:
glScalef(6.0f,6.0f,6.0f);//x,y,z轴均放大6倍
if(bWire){
glutWireIcosahedron();
}
else{
glutSolidIcosahedron();
}
break;
default:
break;
}

//恢复压入栈的Matrix
glPopMatrix();
//交换两个缓冲区的指针
glutSwapBuffers();
}
//设置Redering State
void setupRederingState(void){
//设置清理颜色为黑色
glClearColor(0.0f,0.0,0.0,1.0f);
//设置绘画颜色为绿色
glColor3f(1.0f,1.0f,0.0f);
//使能深度测试
glEnable(GL_DEPTH_TEST);
//获取受支持的点大小范围
glGetFloatv(GL_POINT_SIZE_RANGE,sizes);
//获取受支持的点大小增量
glGetFloatv(GL_POINT_SIZE_GRANULARITY,&step);
printf("point size range:%f-%f\n",sizes[0],sizes[1]);
printf("point step:%f\n",step);
}
//窗口大小变化回调函数
void changSize(GLint w,GLint h){
//横宽比率
GLfloat ratio;
//设置坐标系为x(-100.0f,100.0f)、y(-100.0f,100.0f)、z(-100.0f,100.0f)
GLfloat coordinatesize=10.0f;
//窗口宽高为零直接返回
if((w==0)||(h==0))
return;
//设置视口和窗口大小一致
glViewport(0,0,w,h);
//对投影矩阵应用随后的矩阵操作
glMatrixMode(GL_PROJECTION);
//重置当前指定的矩阵为单位矩阵　
glLoadIdentity();
ratio=(GLfloat)w/(GLfloat)h;
//正交投影
if(w<h)
glOrtho(-coordinatesize,coordinatesize,-coordinatesize/ratio,coordinatesize/ratio,-coordinatesize,coordinatesize);
else
glOrtho(-coordinatesize*ratio,coordinatesize*ratio,-coordinatesize,coordinatesize,-coordinatesize,coordinatesize);
//对模型视图矩阵堆栈应用随后的矩阵操作
glMatrixMode(GL_MODELVIEW);
//重置当前指定的矩阵为单位矩阵　
glLoadIdentity();
}

//按键输入处理回调函数
void specialKey(int key,int x,int y){

if(key==GLUT_KEY_UP){
xRotAngle-=5.0f;
}
else if(key==GLUT_KEY_DOWN){
xRotAngle+=5.0f;
}
else if(key==GLUT_KEY_LEFT){
yRotAngle-=5.0f;
}
else if(key==GLUT_KEY_RIGHT){
yRotAngle+=5.0f;
}
//重新绘制
glutPostRedisplay();
}

int main(int argc, char* argv[])
{
int nModelMenu;
int nWireMenu;
int nMainMenu;
//初始化glut
glutInit(&argc,argv);
//使用双缓冲区、深度缓冲区、模板缓冲区
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_DEPTH|GLUT_STENCIL);
//获取系统的宽像素
SCREEN_WIDTH=glutGet(GLUT_SCREEN_WIDTH);
//获取系统的高像素
SCREEN_HEIGHT=glutGet(GLUT_SCREEN_HEIGHT);
//创建窗口，窗口名字为OpenGL Glut Demo
glutCreateWindow("OpenGL Glut Demo");
//设置窗口大小
glutReshapeWindow(windowWidth,windowHeight);
//窗口居中显示
glutPositionWindow((SCREEN_WIDTH-windowWidth)/2,(SCREEN_HEIGHT-windowHeight)/2);
//创建二级菜单
nModelMenu=glutCreateMenu(processMenu);
glutAddMenuEntry("Sphere",1);
glutAddMenuEntry("Cone",2);
glutAddMenuEntry("Cube",3);
glutAddMenuEntry("Torus",4);
glutAddMenuEntry("Dodecahedron",5);
glutAddMenuEntry("Teapot",6);
glutAddMenuEntry("Octahedron",7);
glutAddMenuEntry("Tetrahedron",8);
glutAddMenuEntry("Icosahedron",9);
nWireMenu=glutCreateMenu(processMenu);
glutAddMenuEntry("Wire",10);
glutAddMenuEntry("Solid",11);
nMainMenu=glutCreateMenu(processMenu);
glutAddSubMenu("Model",nModelMenu);
glutAddSubMenu("WireOrSolid",nWireMenu);
//将菜单榜定到鼠标右键上
glutAttachMenu(GLUT_RIGHT_BUTTON);
//窗口大小变化时的处理函数
glutReshapeFunc(changSize);
//设置显示回调函数
glutDisplayFunc(renderScreen);
//设置按键输入处理回调函数
glutSpecialFunc(specialKey);
//设置全局渲染参数
setupRederingState();
glutMainLoop();
return 0;
}