Cuboid - perspective projection

#include<windows.h>

#include<gl.h>

#include<glu.h>

#include<glut.h>

#include <math.h>

#include<stdio.h>

char title[] = "3D Shapes";

 void initGL() {

   glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

   glClearDepth(1.0f);                  

   glEnable(GL_DEPTH_TEST);  

   glDepthFunc(GL_LEQUAL);   

   glShadeModel(GL_SMOOTH);  

   glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); 

}

void display() {

   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

   glMatrixMode(GL_MODELVIEW);    

    glLoadIdentity();                

   glTranslatef(1.5f, 0.0f, -7.0f);  

   glBegin(GL_QUADS);               

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

      glVertex3f( 1.0f, 1.0f, -1.0f);

      glVertex3f(-1.0f, 1.0f, -1.0f);

      glVertex3f(-1.0f, 1.0f,  1.0f);

      glVertex3f( 1.0f, 1.0f,  1.0f);

       glColor3f(1.0f, 0.5f, 0.0f);     // Orange

      glVertex3f( 1.0f, -1.0f,  1.0f);

      glVertex3f(-1.0f, -1.0f,  1.0f);

      glVertex3f(-1.0f, -1.0f, -1.0f);

      glVertex3f( 1.0f, -1.0f, -1.0f);

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

      glVertex3f( 1.0f,  1.0f, 1.0f);

      glVertex3f(-1.0f,  1.0f, 1.0f);

      glVertex3f(-1.0f, -1.0f, 1.0f);

      glVertex3f( 1.0f, -1.0f, 1.0f);

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

      glVertex3f( 1.0f, -1.0f, -1.0f);

      glVertex3f(-1.0f, -1.0f, -1.0f);

      glVertex3f(-1.0f,  1.0f, -1.0f);

      glVertex3f( 1.0f,  1.0f, -1.0f);

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

      glVertex3f(-1.0f,  1.0f,  1.0f);

      glVertex3f(-1.0f,  1.0f, -1.0f);

      glVertex3f(-1.0f, -1.0f, -1.0f);

      glVertex3f(-1.0f, -1.0f,  1.0f);

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

      glVertex3f(1.0f,  1.0f, -1.0f);

      glVertex3f(1.0f,  1.0f,  1.0f);

      glVertex3f(1.0f, -1.0f,  1.0f);

      glVertex3f(1.0f, -1.0f, -1.0f);

   glEnd(); 

     glLoadIdentity();                 

   glTranslatef(-1.5f, 0.0f, -6.0f); 

 glutSwapBuffers();  }

void reshape(GLsizei width, GLsizei height) {    

   if (height == 0) height = 1;               

   GLfloat aspect = (GLfloat)width / (GLfloat)height;

    glViewport(0, 0, width, height);

  glMatrixMode(GL_PROJECTION); 

   glLoadIdentity();

   gluPerspective(45.0f, aspect, 0.1f, 100.0f);           

   if (width >= height) {

     // aspect >= 1, set the height from -1 to 1, with larger width

      glOrtho(-3.0 * aspect, 3.0 * aspect, -3.0, 3.0, 0.1, 100);

   } else {

      // aspect < 1, set the width to -1 to 1, with larger height

     glOrtho(-3.0, 3.0, -3.0 / aspect, 3.0 / aspect, 0.1, 100);

   }

}

int main(int argc, char** argv) {

   glutInit(&argc, argv);           

   glutInitDisplayMode(GLUT_DOUBLE);

   glutInitWindowSize(640, 480);  

   glutInitWindowPosition(50, 50);

   glutCreateWindow(title);         

   glutDisplayFunc(display);      

   glutReshapeFunc(reshape);       

   initGL();                      

   glutMainLoop();                

   return 0;

}