VS2012下基于Glut OpenGL GL_QUADS示例程序：

OpenGL 使用GL_QUADS绘制四边形示例程序，显示效果如下所示。 GL_QUADS连续点生成四边形的规则如下图所示：

源代码如下：

// GlutQuadsDemo.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;//是否打开不显示背面功能
GLint cullFace=0;
//是否打开深度测试功能
GLint depthTest=0;
//背面是采用线条描外框还是使用单色填充　
GLint outLine=0;
//菜单回调函数
void processMenu(int value){switch(value){case 1:depthTest=!depthTest;break;case 2:cullFace=!cullFace;case 3:outLine=!outLine;break;default:break;}//重新绘制glutPostRedisplay();
}
//显示回调函数
void renderScreen(void){GLfloat x,y,z,angle;//把整个窗口清理为当前清理颜色：黑色glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);//将当前Matrix状态入栈glPushMatrix();//坐标系绕x轴旋转xRotAngleglRotatef(xRotAngle,1.0f,0.0f,0.0f);//坐标系绕y轴旋转yRotAngleglRotatef(yRotAngle,0.0f,1.0f,0.0f);if(depthTest)glEnable(GL_DEPTH_TEST);//打开深度测试功能elseglDisable(GL_DEPTH_TEST);//关闭深度测试功能if(cullFace)glEnable(GL_CULL_FACE);//打开不显示背面功能elseglDisable(GL_CULL_FACE);//关闭不显示背面功能if(outLine)glPolygonMode(GL_BACK,GL_LINE);//多边形背部使用线条描框elseglPolygonMode(GL_BACK,GL_FILL);//多边形背部使用单色填充x=0.0f;y=0.0f;z=0.0f;//进行平滑处理　glEnable(GL_LINE_SMOOTH);glHint(GL_LINE_SMOOTH,GL_NICEST);//绘制坐标系glColor3f(1.0f,1.0f,1.0f);glBegin(GL_LINES);glVertex3f(-80.0f,0.0f,0.0f);glVertex3f(80.0f,0.0f,0.0f);glVertex3f(0.0f,-80.0f,0.0f);glVertex3f(0.0f,80.0f,0.0f);glVertex3f(0.0f,0.0f,-80.0f);glVertex3f(0.0f,0.0f,80.0f);glEnd();glPushMatrix();glTranslatef(80.0f,0.0f,0.0f);glRotatef(90.0f,0.0f,1.0f,0.0f);glutWireCone(3,6,10,10);glPopMatrix();glPushMatrix();glTranslatef(0.0f,80.0f,0.0f);glRotatef(-90.0f,1.0f,0.0f,0.0f);glutWireCone(3,6,10,10);glPopMatrix();glPushMatrix();glTranslatef(0.0f,0.0f,80.0f);glRotatef(90.0f,0.0f,0.0f,1.0f);glutWireCone(3,6,10,10);glPopMatrix();//开始绘制两个四边形glBegin(GL_QUADS);//红色绘制第一个四边形glColor3f(1.0f,0.0f,0.0f);glVertex3f(0.0f,0.0f,0.0f);glVertex3f(25.0f,0.0f,0.0f);glVertex3f(30.0f,30.0f,0.0f);glVertex3f(0.0f,25.0f,0.0f);//红色绘制第二个四边形glColor3f(0.0f,1.0f,0.0f);glVertex3f(0.0f,0.0f,0.0f);glVertex3f(-25.0f,0.0f,0.0f);glVertex3f(-30.0f,-30.0f,0.0f);glVertex3f(0.0f,-25.0f,0.0f);//结束绘四边形glEnd();//恢复压入栈的MatrixglPopMatrix();//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(0.0f,1.0f,0.0f);
}
//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=100.0f;//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);elseglOrtho(-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[])
{//初始化glut glutInit(&argc,argv);//使用双缓冲区模式glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_DEPTH);//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 TriAngle DemoglutCreateWindow("OpenGL Quads Demo");//菜单回调函数glutCreateMenu(processMenu);//添加菜单glutAddMenuEntry("Toggle depth test",1);glutAddMenuEntry("Toggle cull face",2);glutAddMenuEntry("Toggle back outline",3);//将菜单榜定到鼠标右键上glutAttachMenu(GLUT_RIGHT_BUTTON);//设置窗口大小glutReshapeWindow(windowWidth,windowHeight);//窗口居中显示glutPositionWindow((SCREEN_WIDTH-windowWidth)/2,(SCREEN_HEIGHT-windowHeight)/2);//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;
}

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