buggy cube - cube.cpp

#include "cube.hpp"
#include <windows.h>    // only on windows ;)
#include <GL/glut.h>

Cube::Cube(float a)
{
    this->a = a;
    angle = 0;
}

void Cube::draw() const
{
    glTranslatef(0, 0, -150);
    glRotatef(angle, 0, 1, 0);

    glBegin(GL_QUADS);
        // left face
        glColor3f(0.0f, 1.0f, 0.0f);
        glVertex3f(-a/2, a/2, a/2);
        glVertex3f(-a/2,-a/2, a/2);
        glVertex3f(-a/2,-a/2,-a/2);
        glVertex3f(-a/2, a/2,-a/2);

        // right face
        glColor3f(0.0f, 0.0f, 1.0f);
        glVertex3f (a/2, a/2, a/2);
        glVertex3f( a/2,-a/2, a/2);
        glVertex3f( a/2,-a/2,-a/2);
        glVertex3f( a/2, a/2,-a/2);

        // bottom face
        glColor3f(1.0f, 1.0f, 0.0f);
        glVertex3f( a/2,-a/2, a/2);
        glVertex3f(-a/2,-a/2, a/2);
        glVertex3f(-a/2,-a/2,-a/2);
        glVertex3f( a/2,-a/2,-a/2);

        // top face
        glColor3f(1.0f,1.0f, 1.0f);
        glVertex3f( a/2, a/2, a/2);
        glVertex3f(-a/2, a/2, a/2);
        glVertex3f(-a/2, a/2,-a/2);
        glVertex3f( a/2, a/2,-a/2);

        // back face
        glColor3f(1.0f, 0.5f, 0.0f);
        glVertex3f( a/2, a/2,-a/2);
        glVertex3f(-a/2, a/2,-a/2);
        glVertex3f(-a/2,-a/2,-a/2);
        glVertex3f( a/2,-a/2,-a/2);

        // front face
        glColor3f(1.0f, 0.0f, 0.0f);
        glVertex3f( a/2, a/2, a/2);
        glVertex3f(-a/2, a/2, a/2);
        glVertex3f(-a/2,-a/2, a/2);
        glVertex3f( a/2,-a/2, a/2);

    glEnd();
}

void Cube::tick()
{
    angle++;
}