An alternative Manhattan Router

[rsoika]

Hi, I have implemented an extension from the GLSP Manhattan Router. This router takes care of custom routing when moving elements. In difference to the origin router the router tries to protect the existing routing during moving elements:

The router registers a MouseListener to track the move event and updates the computed route from the origin router. It simply adjusts the first two routing points of out going edges and the last two routing points of in going edges

bpmn-manhattan-router.txt

I am not sure if this is something that makes sense for you project. We need this in our BPMN project and I need to improve it in some more details, so I just post now the core implementation of this routing concept.

[tortmayr]

Hi @rsoika,
thanks for reaching out.
Your router implementation already looks very promising and is definitely something that would also be interesting for GLSP.
Maybe we can come back to this once you cleaned up/improved you solution?
And then we can discuss how to best integrate this into the core framework.

[rsoika]

I have no better code than the one I posted here in the file 'bpmn-manhattan-router.txt'.
My further development is using internal Open-BPMN Features that are specific to my project. The main issue for me was to identify the correct element when a mouse-click event was triggered.

To sum it up: in general I simply tack the mouse click event to register the element to be moved. In the routing method I first call the standard behavior and next I look if we have a custom waypoint in the routing. If so, I adjust the position of this waypoint (the last one for incomming, and the first one for outgoing edges) with the same offset I have recorded before.
here you can see my current implementation with my custom method 'isBPMNElement'.

I guess you find better (more elegant) ways to compute/track the move-event?
An integration into the standard router should be possible by defining a new option to activate this adjustment of the existing waypoints - if you think the solution/idea is somehow useful....