/// <summary>
/// Inserts this polygon into the supplied index, so long as it's not already
/// marked as indexed. Then marks it as indexed.
/// </summary>
/// <param name="index">The spatial index to add to</param>
/// <returns>True if entry added to index. False if this ring is already marked
/// as indexed.</returns>
internal bool AddToIndex(EditingIndex index)
{
if (IsIndexed)
{
return(false);
}
index.Add(this);
IsIndexed = true;
return(true);
}
