3D cube with rotation

// Template1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <math.h>
#include <Windows.h>
#include "include\GL\GL.H"
#include "include\GL\GLU.H"
#include "include\GL\glut.h"
#include "Template1.h"

using namespace std;

double rotate_y = 0;
double rotate_x = 0;


void MyDisplay(void) {
    glLoadIdentity();
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();
    glTranslated(0.0, 0.0, -7.0);
    glRotatef(rotate_x, 1.0, 0.0, 0.0);
    glRotatef(rotate_y, 0.0, 1.0, 0.0);


    //back
    glBegin(GL_POLYGON);
    glColor3f(1.0f, 0.0f, 0.0f);
    glVertex3d(1, 1, 1);
    glVertex3d(-1, 1, 1);
    glVertex3d(-1, -1, 1);
    glVertex3d(1, -1, 1);
    glEnd();

    //front
    glBegin(GL_POLYGON);
    glColor3f(0.0f, 1.0f, 0.0f);
    glVertex3d(1, 1, -1);
    glVertex3d(-1, 1, -1);
    glVertex3d(-1, -1, -1);
    glVertex3d(1, -1, -1);
    glEnd();

    //right side
    glBegin(GL_POLYGON);
    glColor3f(0.0f, 0.0f, 1.0f);
    glVertex3d(1, 1, -1);
    glVertex3d(1, 1, 1);
    glVertex3d(1, -1, 1);
    glVertex3d(1, -1, -1);
    glEnd();

    //left side
    glBegin(GL_POLYGON);
    glColor3f(1.0f, 1.0f, 0.0f);
    glVertex3d(-1, 1, -1);
    glVertex3d(-1, 1, 1);
    glVertex3d(-1, -1, 1);
    glVertex3d(-1, -1, -1);
    glEnd();

    //top
    glBegin(GL_POLYGON);
    glColor3f(1.0f, 0.0f, 1.0f);
    glVertex3d(1, 1, -1);
    glVertex3d(-1, 1, -1);
    glVertex3d(-1, 1, 1);
    glVertex3d(1, 1, 1);
    glEnd();

    //bottom
    glBegin(GL_POLYGON);
    glColor3f(0.0f, 1.0f, 1.0f);
    glVertex3d(1, -1, -1);
    glVertex3d(-1, -1, -1);
    glVertex3d(-1, -1, 1);
    glVertex3d(1, -1, 1);
    glEnd();

    glPopMatrix();
    glFlush();
    //necessary for GLU_DOUBLE displayMode
    //glutSwapBuffers();

}
void keyboard(int key, int x, int y) {

    if (key == GLUT_KEY_RIGHT)
        rotate_y += 5;

    else if (key == GLUT_KEY_LEFT)
        rotate_y -= 5;

    else if (key == GLUT_KEY_UP)
        rotate_x -= 5;

    else if (key == GLUT_KEY_DOWN)
        rotate_x += 5;

    // Request display update
    glutPostRedisplay();

}


void MyInit(void) {
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glViewport(0, 500, 500, 500);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60, 1, 1, 20.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glDrawBuffer(GL_BACK);
    glEnable(GL_DEPTH_TEST);
}

void Rotate(int){}

int main(int argc, char** argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);//single buffer and RGBA
    glutInitWindowSize(500, 500);//initial window size
    glutInitWindowPosition(100, 100);
    glutCreateWindow("Cube");//create widnow, hello title bar
    MyInit();
    glutDisplayFunc(MyDisplay);
    glutSpecialFunc(keyboard);
    glutMainLoop();//enter main loop and process events
    return 0;
}