So this kind of on topic to my other OpenGL question (not my OpenGL ES question but OpenGL the desktop version). If you have someone press a key to move a square how do you make the square movement naturally and less jumpy but also at the same speed I have it now? This is my code for the glutKeyboardFunc() function:

void handleKeypress(unsigned char key, int x, int y) 
{
        if (key == 'w')
        {
            for (int i = 0; i < 12; i++)
            {
                if (i == 1 || i == 7 || i == 10 || i == 4)
                {
                    square[i] = square[i] + 1;
                }
            }
            glutPostRedisplay();
        }
        if (key == 'd')
        {
            for (int i = 0; i < 12; i++)
            {
                if (i == 0 || i % 3 == 0)
                {
                    square[i] = square[i] + 1;
                }
            }
            glutPostRedisplay();
        }
    if (key == 's')
    {
        for (int i = 0; i < 12; i++)
        {
            if (i == 1 || i == 7 || i == 10 || i == 4)
            {
                square[i] = square[i] - 1;
            }
        }
        glutPostRedisplay();
    }
        if (key == 'a')
        {
            for (int i = 0; i < 12; i++)
            {
                if (i == 0 || i % 3 == 0)
                {
                    square[i] = square[i] - 1;
                }
            }
            glutPostRedisplay();
        }
}

I'm sorry if this doesn't quite make sense I'll try to rephrase it in a better way if it doesn't make sense.