Selection Input

[dinocoglitore]

Hi all, I'm having problems with a multiple selection of curves from an Command Dialog.

I din not find any example on the forum or in the documentation so I am asking some help or some example code.

These are extracts from the Add-in I'm trying to write:

Inside the  SampleCommandCreatedHandler I have this code

.....................

# Create selection input

curve_input = inputs.addSelectionInput('curve_input', 'Select', 'Select curve')

# select only curves

curve_input.addSelectionFilter('SketchCurves')

# I can select more than one curve

curve_input.setSelectionLimits(0)

.....................

Inside the SampleCommandExecuteHandler I have this code

.....................

# count the number of curves selected

n_selection = inputs.itemById('curve_input').selectionCount

# get the curve selected and call helix()

for i in range (0, n_selection 😞

cur = inputs.itemById('curve_input').selection(i)

curve = cur.entity

# call a function witn the curve selected

helix( curve )

I do not understand the reason why I receve this error

 

If I select 3 curves and use the following instruction

cur = inputs.itemById('curve_input').selection(0)

or

cur = inputs.itemById('curve_input').selection(1)

or

cur = inputs.itemById('curve_input').selection(2)

they do not provide error

Someone can help me ?

Many Thanks

Dino

[ekinsb · Accepted solution]

Selections are somewhat fragile and doing something that changes the database in any way will usually clear any current selections.  I believe that's the problem you're running into here. Whatever your helix command is doing is also having the side effect of clearing the current selection so when you try to get the next entity in the selection it fails.  To work around that you can first get everything from the selection and then do the processing, like shown below.

curves = []
for i in range (0, n_selection ):
    curves.append( inputs.itemById('curve_input').selection(i).entity )

for curve in curves:
    helix( curve )

[dinocoglitore]

Hi Brian, thank you very much for your answer. It obviously solved my problem and make me climb another rung in the kwnoledge of API and Python.

Thanks

Dino

[2way3dtext]

Dear kandennti

Thank you so much for your help!

Your code runs perfectly and is also much neater than my original script! I am grateful for your generous support.