UndrawVertex
(
IVertex vertex,
GraphDrawingContext graphDrawingContext
)
{
Debug.Assert(vertex != null);
Debug.Assert(graphDrawingContext != null);
AssertValid();
// Retrieve the VertexDrawingHistory object for the vertex, if one
// exists. (If the vertex was previously hidden, there won't be a
// VertexDrawingHistory object for it.)
VertexDrawingHistory oVertexDrawingHistory;
if ( TryGetVertexDrawingHistory(vertex, out oVertexDrawingHistory) )
{
// Remove the VertexDrawingHistory object from the vertex.
vertex.RemoveKey(ReservedMetadataKeys.VertexDrawingHistory);
// Remove the vertex's DrawingVisual object, which will cause the
// vertex to disappear.
m_oAllVertexDrawingVisuals.Children.Remove(
oVertexDrawingHistory.DrawingVisual);
}
}