Dynamic Graph With Constant Layout

[ibnesayeed]

I am trying to use constant layout to specify node placement myself. I also want to dynamically add or remove nodes/edges in the graph periodically. I am getting two types of errors while doing this.

• I guess "position" property of dynamically added nodes is undefined hence it cannot find x/y coordinates.
• "Uncaught Update type is not implemented. TODO: Implement me!" - I tried calling graph.beginUpdate() and graph.endUpdate() but it did not help.

Any help please!

[anvaka]

@ibnesayeed Do you have a link to reproduce the problem?

PS: Are you trying to make all nodes fixed or you need some of them to be positioned by vivagraph?

[ibnesayeed]

I have a JSON file that has pre-calculated X and Y positions of each node as well as color and other attributes are encoded in JSON itself. I want to apply one node at a time from JSON to the graph. The nature of my need is such that I cannot pre-render all the nodes in advance. Hence, all the nodes will be added dynamically on a constant layout. I will try to write a small example code that can reproduce this issue and I will post it here soon.

Thanks for the help!

[ibnesayeed]

Here is a fiddle http://jsfiddle.net/HE7tb/

Three nodes were supposed to be panted while only one node is being painted in this fiddle. and it throws error saying, "Uncaught TypeError: Cannot read property 'x' of undefined"

[anvaka]

Fixed. If your example reflects what you are doing, you might also want to add a fake node before call to the renderer.run, and remove it afterwards. This trick will auto-center the graph: http://jsfiddle.net/HE7tb/2/

[ibnesayeed]

Thanks for the fix. You were really very helpful. And thanks again for the additional trick to auto-center the graph. I am closing this bug report. :-)