Isselected component

Hi! I want to make a small component that returns a boolean if current geometry is selected in rhino.

I found this "isselected" comand in Rhinocommon,

but did not understand how make it works. Please, give me a clue how to deal with it or a link to example.

What i want to do is to feed this component with geometry ID`s and have a list of boolean answers.

Thnx in adwance

Replies to This Discussion

Permalink Reply by David Rutten on December 26, 2011 at 12:04pm

Hi Philipp,

you want the component to update when a selection changes? Because that involved event handling as well.

David Rutten

david@mcneel.com

Poprad, Slovakia

Attachments:

CheckSelected.gh, 2 KB

Permalink Reply by Philipp on December 26, 2011 at 12:25pm

David, thank you very much, that exactly what I wanted! Now I can visualise information separately and design an interface mixing this component with firefly "if button pushed"

but what means "<> 0" in the last line selected = obj.IsSelected(False) <> 0 ???

Think it is a good idea to add something like this (maybe there is a way to speed it, now it a bit slow) to Firefly...

Permalink Reply by David Rutten on December 26, 2011 at 1:03pm

IsSelected() returns a number of possible integers:

0 = object is not selected.

1 = object is selected.

2 = entire object is selected persistently.

3 = one or more proper sub-objects are selected.

So the <> 0 means, "if the IsSelected method returns anything other than zero, then we assign TRUE to the component output."

In my opinion this should never have been an integer, but rather an enumeration. However, changing it now means breaking the RhinoCommon SDK.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Anton Szilasi on July 26, 2015 at 2:13am

Hi David,

Thanks for this piece of code its also very useful to me however I noticed it only works when you click on the Grasshopper canvas - re-compute is there is a way to make it so I don't need to do this?

Permalink Reply by David Rutten on July 27, 2015 at 5:41am

If you want to respond to selection events in Rhino then you'll need to handle those events. You'll need to look at the RhinoDoc.DeselectAllObjects, RhinoDoc.DeselectObjects, and RhinoDoc.SelectObjects events.

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