Change Node position in MSAGL

Question

Is there a way to specify the position of a node in the graph? For example:

Graph graph = graphViewer.Graph;
graph.AddNode("2");
Microsoft.Msagl.Core.Geometry.Point position = (199,991);
graph.FindNode("2").GeometryNode.Center = position;
graphViewer.Graph = graph;

I'm using the WpfApplicationSample from the msagl.

The code doesn't change the position of the point. Up to the "graphViewer.Graph = graph;" graph still has the changed node("2") position, but after the last command, both graph and graphViewer.Graph change the node's position to the original. Any tips how to solve this?

Answer 1

By running Graph graph = graphViewer.Graph; the layout algorithm is called and therefore, the node positions and edges are calculated again by the selected layout algorithm. One can take over the pre-calculation of the layout by graphViewer.NeedToCalculateLayout = false; before the Graph graph = graphViewer.Graph;. Which then ensures that the previously modified geometry will remain after the assignment. The MSAGL Author has helped me with this answer.