public void OnMouseDown(MouseButtonEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed &&
e.OriginalSource is FrameworkElement element &&
element.DataContext is GraphVertex vertex)
{
_source = vertex;
_halfEdge = new GraphHalfEdge(vertex, e.GetPosition(_grid));
_graph.AddHalfEdgeCommand.Execute(_halfEdge);
_source = vertex;
}
}
private void Reset()
{
_graph.RemoveHalfEdgeCommand.Execute(_halfEdge);
_halfEdge = null;
_source = null;
}
