Recompute from custom component

I have a custom component that sets parent/child relationships in a nodal network.

If data is added my system works, however if data is deleted (e.g. curve deleted from list of inputs or disconnected) it fails to work.

There can be several of these components that are unaware of one another so I cannot just clear the data and add to it afresh.

If I perform a manual recompute (F5) it solves my problems.

Is there a way I can force a full recompute from within my code? I am aware of NewSolution but not sure about how I could go about implementing it (would I not end up in a never ending loop? I am also struggling to find out how to get the active grasshopper document from within the code of my component).

Any help would be very much appreciated.

Replies to This Discussion

Permalink Reply by David Rutten on February 11, 2014 at 10:45am

Yes you can, here are the steps:

When you change date inside a parameter or add/remove a wire, you must call ExpireSolution(false) on that object. You can call ExpireSolution(false) as often as you like, only the first call will actually do anything.
When you are done making all changes, call NewSolution(false) on the GH_Document. This will cause all expired object to recompute (but not the intact ones).

F5 calls GH_Document.ExpireSolution(true), which first expires all objects prior to recomputing. You do not need this kind of sledgehammer approach.

David Rutten

david@mcneel.com

Permalink Reply by Hugh Groves on February 12, 2014 at 2:40am

Thank you for the reply David.

Excuse me for being a bit stupid, but would you mind posting a code snippet (preferably C#) retrieving the active GH_Document and calling NewSolution(false)?

Permalink Reply by Hugh Groves on February 12, 2014 at 7:56am

Found out how to do it, for anyone in the future it is in:

Grasshopper.Instances.ActiveCanvas.Document

Permalink Reply by J Frölich on January 9, 2015 at 5:36am