Programmatically change the layout algorithm

Question

Hi,

The default layout algorithm is not well suited to the kinds of graphs I'm drawing and I wonder how I would go about changing to one of the alternate layout methods in code.  I am rendering to a bitmap so interacting with the viewer is not an option.

thanks for the great tool,
R

Answer 1

At the moment GraphRenderer will alway use the Sugiyama layout. It is a bug. To work around it
please change the CalculateLayout method of GraphRenderer in the following way
 public void CalculateLayout() {
            using (GViewer gv = new GViewer()){
                gv.CurrentLayoutMethod = LayoutMethod.UseSettingsOfTheGraph;
                layedOutGraph = gv.CalculateLayout(this.graph);
            }
        }


Then before calling GraphRenderer set the graph settings.
 graph.LayoutAlgorithmSettings = new Microsoft.Msagl.Mds.MdsLayoutSettings();
Thanks,
Lev

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Lev Nachmanson

Answer 2

To be clear, since GraphRenderer is sealed and the source code doesn't seem to be freely available, you will need to disasseble (I used Red Gate's Reflector) that class. Then copy the code and make your own GraphRenderer with that disassebled source code MAKING sure you change CalculateLayout with the method described above.

Answer 3

The source of GraphRenderer is available in the distribution. So please change the source there.

Thanks,

Lev

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Lev Nachmanson