for i = 0; i < grid_height; i++
    for j = 0; j < grid_width; j++
        if is_even(i)          and is_even(j)
            draw_hex_at(j*x_spacing, i*y_spacing)
        else if is_even(i)     and not is_even(j)
            draw_hex_at(j*x_spacing + x_offset, i*y_spacing)
        else if not is_even(i) and is_even(j)
            draw_hex_at(j*x_spacing, i*y_spacing + y_offset)
        else if not is_even(i) and not is_even(j)
            draw_hex_at(j*x_spacing + x_offset, i*y_spacing + y_offset)