OpenGL绘制的几类三维实体

最新推荐文章于 2021-06-24 22:24:43 发布

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最新推荐文章于 2021-06-24 22:24:43 发布

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CC 4.0 BY-SA版权

文章标签： python

原文链接：https://my.oschina.net/u/1469992/blog/220446

本文介绍了一个使用OpenGL绘制多种三维实体的示例程序。通过切换菜单选项，可以展示不同类型的3D模型，包括圆锥体、四面体、正方体等，并支持线框或实体显示模式。

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OpenGL绘制的几类三维实体

EXAM304_H

//防止重复嵌入

#if !defined _EXAM304_H_

#define _EXAM304_H_

//指定嵌入文件

#include<gl/glut.h>

#include<math.h>

//宏

#define RADIUS 50.0f

#define SIZE 100.0f

#define CONE 1

#define TETRAHEDRON 2

#define CUBE 3

#define DODECAHEDRON 4

#define ICOSAHEDRON 5

#define OCTAHEDRON 6

#define SPHERE 7

#define TORUS 8

#define TEAPOT 9

#define WIRED 10

//全局变量

GLboolean bWire=false;

GLint nSelected=CONE;

//函数原型

void OnDisplay(void);

void OnReshape(int,int);

void OnMenu(int value);

void CreateMenu();

void SetupLights();

#endif

EXAM304.cpp

#include "EXAM304.H"

void main(int argc,char *argv[])

{

glutInit(&argc,argv);

glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);

glutInitWindowSize(640,480);

glutInitWindowPosition(10,10);

glutCreateWindow("EXAM304");

glutCreateMenu(OnMenu);

glutDisplayFunc(OnDisplay);

glutReshapeFunc(OnReshape);

CreateMenu();

SetupLights();

glutMainLoop();

}

void OnDisplay(void)

{

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

glEnable(GL_DEPTH_TEST);

glPushMatrix();

glColor3f(0.0f,1.0f,1.0f);

glEnable(GL_NORMALIZE);

switch(nSelected)

{

case(CONE):

if(bWire)

glutWireCone(RADIUS,2*RADIUS,30,30);

else

glutSolidCone(RADIUS,2*RADIUS,30,30);

break;

case(TETRAHEDRON):

glPushMatrix();

glScalef(RADIUS,RADIUS,RADIUS);

if(bWire)

glutWireTetrahedron();

else

glutSolidTetrahedron();

glPopMatrix();

break;

case(CUBE):

if(bWire)

glutWireCube(1.5*RADIUS);

else

glutSolidCube(1.5*RADIUS);

break;

case(DODECAHEDRON):

glPushMatrix();

glScalef(RADIUS/2,RADIUS/2,RADIUS/2);

if(bWire)

glutWireDodecahedron();

else

glutSolidDodecahedron();

glPopMatrix();

break;

case(ICOSAHEDRON):

glPushMatrix();

glScalef(RADIUS,RADIUS,RADIUS);

if(bWire)

glutWireIcosahedron();

else

glutSolidIcosahedron();

glPopMatrix();

break;

case(OCTAHEDRON):

glPushMatrix();

glScalef(RADIUS,RADIUS,RADIUS);

if(bWire)

glutWireOctahedron();

else

glutSolidOctahedron();

glPopMatrix();

break;

case(SPHERE):

if(bWire)

glutWireSphere(RADIUS,30,30);

else

glutSolidSphere(RADIUS,30,30);

break;

case(TORUS):

if(bWire)

glutWireTorus(RADIUS/2,RADIUS,30,30);

else

glutSolidTorus(RADIUS/2,RADIUS,30,30);

break;

case(TEAPOT):

if(bWire)

glutWireTeapot(RADIUS);

else

glutSolidTeapot(RADIUS);

}

glPopMatrix();

glutSwapBuffers();

}

//窗口尺寸变化后的回调函数

void OnReshape(int w,int h)

{

glViewport(0,0,w,h);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

float aspect=(float)h/(float)w;

if(w<=h)

glOrtho(-SIZE,SIZE,-SIZE*aspect,SIZE*aspect,-SIZE,SIZE);

else

glOrtho(-SIZE/aspect,SIZE/aspect,-SIZE,SIZE,-SIZE,SIZE);

gluLookAt(10.0f,20.0f,25.0f,0.0f,0.0f,0.0f,0.0f,1.0f,0.0f);

}

void OnMenu(int value)

{

if(value==WIRED)

bWire=!bWire;

else

nSelected=value;

glutPostRedisplay();

}

void CreateMenu()

{

glutAddMenuEntry("圆锥体",CONE);

glutAddMenuEntry("四面体",TETRAHEDRON);

glutAddMenuEntry("正方体",CUBE);

glutAddMenuEntry("正十二面体",DODECAHEDRON);

glutAddMenuEntry("正二十面体",ICOSAHEDRON);

glutAddMenuEntry("正八面体",OCTAHEDRON);

glutAddMenuEntry("球体",SPHERE);

glutAddMenuEntry("圆环体",TORUS);

glutAddMenuEntry("茶壶",TEAPOT);

glutAddMenuEntry("线框或实体",WIRED);

glutAttachMenu(GLUT_RIGHT_BUTTON);

}

void SetupLights()

{

GLfloat ambientLight[]={0.2f,0.2f,0.2f,1.0f};

GLfloat diffuseLight[]={0.9f,0.9f,0.9f,1.0f};

GLfloat specularLight[]={1.0f,1.0f,1.0f,1.0f};

GLfloat lightPos[]={50.0f,100.0f,80.0f,1.0f};

glEnable(GL_LIGHTING);

glLightfv(GL_LIGHT0,GL_AMBIENT,ambientLight);

glLightfv(GL_LIGHT0,GL_DIFFUSE,diffuseLight);

glLightfv(GL_LIGHT0,GL_SPECULAR,specularLight);

glLightfv(GL_LIGHT0,GL_POSITION,lightPos);

glEnable(GL_LIGHT0);

glEnable(GL_COLOR_MATERIAL);

glColorMaterial(GL_FRONT,GL_AMBIENT_AND_DIFFUSE);

glMaterialfv(GL_FRONT,GL_SPECULAR,specularLight);

glMateriali(GL_FRONT,GL_SHININESS,100);

}

转载于:https://my.oschina.net/u/1469992/blog/220446