//Initialise SDL.
    if(SDL_Init(SDL_INIT_VIDEO) < 0) exit(1);

    //Use double buffering (24-bit).
    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
    SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 24 );

    //Create window.
    if (SDL_SetVideoMode(1000, 1000, 32, SDL_OPENGL) == 0) exit(1);
    SDL_WM_SetCaption("cp22g08 Coursework 1", "cp22g08 Coursework 1");

    //Set up orthographic camera.
    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glOrtho(-2, 2, -2, 2, 2, -2);

    glMatrixMode(GL_MODELVIEW);

    //Set the clear color.
    glClearColor(0, 0, 0, 1);

    //Use the z-buffer.
    glEnable(GL_DEPTH_TEST);

    //Use vertex and colour arrays.
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);

    //Calculate the vertex and colour data.
    calculateV();
    calculateC();