IExtensionIsMiterLocked Property

bool this[
	int index
] { get; set; }

Property IsMiterLocked ( 
	index As Integer
) As Boolean
	Get
	Set

property bool IsMiterLocked[int index] {
	bool get (int index);
	void set (int index, bool value);
}

abstract IsMiterLocked : bool with get, set

Property index must be 0 or 1 to indicate two ends, otherwise exceptions will be thrown. For beams, only if the beam is extended and is mitered with other beams at the end, it can be locked. Otherwise, the setting is invalid