计算机专业课程设计OPENGL旋转立方体

计算机专业课程设计OPENGL旋转立方体1000字OpenGL是一种跨平台的图形API，可以被用于开发3D渲染、可视化等应用程序。本文将介绍如何使用OpenGL旋转一个立方体。首先，我们需要安装OpenGL的库文件和相关的工具。在Windows平台下，可以使用Mingw-w64工具链和FreeGLUT库进行开发。接下来，在创建OpenGL窗口后，我们需要创建一个立方体的几何图形：```c++glBegin(GL_QUADS);//开始绘制四边形glColor3f(1.0,0.0,0.0);//设置颜色，这里是红色glVertex3f(-1.0,1.0,1.0);//左上前角glVertex3f(-1.0,-1.0,1.0);//左下前角glVertex3f(1.0,-1.0,1.0);//右下前角glVertex3f(1.0,1.0,1.0);//右上前角glColor3f(0.0,1.0,0.0);//绿色glVertex3f(-1.0,1.0,-1.0);//左上后角glVertex3f(-1.0,-1.0,-1.0);//左下后角glVertex3f(1.0,-1.0,-1.0);//右下后角glVertex3f(1.0,1.0,-1.0);//右上后角glColor3f(0.0,0.0,1.0);//蓝色glVertex3f(-1.0,1.0,1.0);//左上前角glVertex3f(-1.0,1.0,-1.0);//左上后角glVertex3f(1.0,1.0,-1.0);//右上后角glVertex3f(1.0,1.0,1.0);//右上前角glColor3f(1.0,1.0,0.0);//黄色glVertex3f(-1.0,-1.0,1.0);//左下前角glVertex3f(-1.0,-1.0,-1.0);//左下后角glVertex3f(1.0,-1.0,-1.0);//右下后角glVertex3f(1.0,-1.0,1.0);//右下前角glColor3f(0.0,1.0,1.0);//青色glVertex3f(-1.0,1.0,1.0);//左上前角glVertex3f(-1.0,1.0,-1.0);//左上后角glVertex3f(-1.0,-1.0,-1.0);//左下后角glVertex3f(-1.0,-1.0,1.0);//左下前角glColor3f(1.0,0.0,1.0);//粉色glVertex3f(1.0,1.0,1.0);//右上前角glVertex3f(1.0,1.0,-1.0);//右上后角glVertex3f(1.0,-1.0,-1.0);//右下后角glVertex3f(1.0,-1.0,1.0);//右下前角glEnd();//结束四边形的绘制```这里我们用了`glBegin(GL_QUADS)`和`glEnd()`来将一个立方体拆解成了6个面，每个面都由一个四边形组成。这个函数调用结束后，OpenGL会开始绘制所有的顶点。接下来，我们需要对立方体进行旋转。我们可以通过下面的代码来实现立方体的自转：```c++glRotatef(angle,1.0f,1.0f,1.0f);//沿着(1,1,1)轴进行旋转```这里我们利用了OpenGL中的旋转函数`glRotatef()`。它的第一个参数是旋转角度，后面三个参数是旋转的轴向。在每一帧中，我们需要修改`angle`变量的值来控制旋转速度。比如，可以在绘制循环的开始处加入如下代码：```c++angle+=1.0f;```这样每帧的`angle`都会增加1.0f，立方体也会不断旋转。完整的代码如下：```c++#include<GL/glut.h>floatangle=0.0f;voiddisplay(){glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);glLoadIdentity();glTranslatef(0.0f,0.0f,-6.0f);//将物体移动到观察点glRotatef(angle,1.0f,1.0f,1.0f);//沿着(1,1,1)轴进行旋转glBegin(GL_QUADS);glColor3f(1.0,0.0,0.0);glVertex3f(-1.0,1.0,1.0);glVertex3f(-1.0,-1.0,1.0);glVertex3f(1.0,-1.0,1.0);glVertex3f(1.0,1.0,1.0);glColor3f(0.0,1.0,0.0);glVertex3f(-1.0,1.0,-1.0);glVertex3f(-1.0,-1.0,-1.0);glVertex3f(1.0,-1.0,-1.0);glVertex3f(1.0,1.0,-1.0);glColor3f(0.0,0.0,1.0);glVertex3f(-1.0,1.0,1.0);glVertex3f(-1.0,1.0,-1.0);glVertex3f(1.0,1.0,-1.0);glVertex3f(1.0,1.0,1.0);glColor3f(1.0,1.0,0.0);glVertex3f(-1.0,-1.0,1.0);glVertex3f(-1.0,-1.0,-1.0);glVertex3f(1.0,-1.0,-1.0);glVertex3f(1.0,-1.0,1.0);glColor3f(0.0,1.0,1.0);glVertex3f(-1.0,1.0,1.0);glVertex3f(-1.0,1.0,-1.0);glVertex3f(-1.0,-1.0,-1.0);glVertex3f(-1.0,-1.0,1.0);glColor3f(1.0,0.0,1.0);glVertex3f(1.0,1.0,1.0);glVertex3f(1.0,1.0,-1.0);glVertex3f(1.0,-1.0,-1.0);glVertex3f(1.0,-1.0,1.0);glEnd();glutSwapBuffers();}voidreshape(intw,inth){glViewport(0,0,w,h);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(45.0f,(GLfloat)w/(GLfloat)h,0.1f,100.0f);glMatrixMode(GL_MODELVIEW);}voididle(){angle+=1.0f;glutPostRedisplay();}intmain(