public override void BeginSnap(GraphElement selectedElement)
{
if (IsActive)
{
throw new InvalidOperationException("SnapStrategy.BeginSnap: Snap to spacing already active. Call EndSnap() first.");
}
IsActive = true;
m_GraphView = selectedElement.GraphView;
if (m_LineView == null)
{
m_LineView = new LineView(m_GraphView);
}
m_GraphView.Add(m_LineView);
}