/// <summary>
/// Select vertex by setting its tag and highlight value
/// </summary>
/// <param name="vc">VertexControl object</param>
private void SelectVertex(DependencyObject vc)
{
if (DragBehaviour.GetIsTagged(vc))
{
HighlightBehaviour.SetHighlighted(vc, false);
DragBehaviour.SetIsTagged(vc, false);
vc.ClearValue(DragBehaviour.XSnapModifierProperty);
vc.ClearValue(DragBehaviour.YSnapModifierProperty);
}
else
{
HighlightBehaviour.SetHighlighted(vc, true);
DragBehaviour.SetIsTagged(vc, true);
DragBehaviour.SetXSnapModifier(vc, ExaggeratedSnappingXModifier);
DragBehaviour.SetYSnapModifier(vc, ExaggeratedSnappingYModifier);
}
}