Changing node color OGDF Library

Question

I am trying to change the node color using the following code but getting Segmentation fault.

I am using the latest OGDF snapshot.

Graph G;
GraphAttributes GA(G, GraphAttributes::nodeGraphics |   
         GraphAttributes::edgeGraphics );

node left = G.newNode();
GA.strokeColor (left) = Color("red"); 

Answer 1

The attribute GraphAttributes::nodeGraphics only enables coordinates and shapes of the node but not its color. For the stroke and fill styling, you need to enable GraphAttributes::nodeStyle in the constructor:

Graph G;
GraphAttributes GA(G,
        GraphAttributes::nodeGraphics |   
        GraphAttributes::nodeStyle |      // <-- Enables node stroke and filling
        GraphAttributes::edgeGraphics );

node left = G.newNode();
GA.strokeColor(left) = Color("red"); 

For a mapping of attributes you can use and the enum values you need to enable in the constructor (or later), see the documentation of the enumeration.