aligning and positioning edge labels

[Srirama Bhamidipati]

Hi,

I would like to label edges of my graph. And I would like to align these labels to the edge's direction/ heading. I tried "rotate" with a heading, but it did not work for me. Is there something I am missing? How do I know what is the heading of my edge? To make it more precise, I am not making this graph as an agent *yet" and displaying it from the "graphics" section. 

Would the approach differ if I have my graph as a species ?

Please guide,

thanks

srirama

[Patrick Taillandier]

Hi,

Here a solution that is far from perfect (a bit ugly sometimes) but that is better than nothing :p :

display cool_graph {

       graphics "graph" {

               int i <- 0; //just use to give a different name to each edge

               loop e over: gr.edges {

                geometry eg <- geometry(e); // to avoid to write many times "geometry(e)"

                draw eg end_arrow: 2 color: #blue; //just add an end arrow to know the direction of the edge

                draw ("edge " + i) size: 3 at: eg.location color: #black rotate: (angle_between(first(eg.points), {first(eg.points).x,0}, last(eg.points)) - 90); //a bit ugly... but well..... there is maybe a better solution....

                i<- i + 1;

                }

        }

               

}  

Cheers,

Patrick

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[Srirama Bhamidipati]

It indeed is a Cool_display, it works !!!!

regards,

Sriram

[Patrick Taillandier]

Note than rather using "angle_between", you can use here "direction_to" (simpler here):

draw ("edge " + i) size: 3 at: eg.location color: #black rotate: first(eg.points) direction_to last(eg.points);

Cheers,

Patricj

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