/// <summary>
/// Adjusts the size of the map. If there is already a map created, clears the old map and
/// initializes a new one. None of the data from the old map is preserved.
/// </summary>
/// <param name="offset"></param>
private void AdjustSize(int offset)
{
resolution += offset;
resolution = (int)MathHelper.Clamp(resolution, 1, 11);
size = (int)Math.Pow(2, resolution) + 1;
if (map != null)
map.Destroy();
map = new Map(size, size);
map.AddColorMap(Map.DefaultColorMap);
}