Get subcurves of polycurve in Python?

Scripting
1

Hi…,

I’ve tried to start here: Rhino - Rhino.Python Guides. Surprisingly I don’t find a topic about curves.

How to get the subcurves of a polycurve in Python?

Thanks

Michael

2

Hi @Michael_Meyer,

Use PolyCurve.SegmentCurve.

– Dale

3

Hi @dale,

thank you for the RhinoCommon method. I am still lost, I don’t know how to mix rhinoscriptsyntax with RhinoCommon.

My try doesn’t work:

    curve_guid = rs.GetCurveObject("Select PolyCurve")[0]
    if curve_guid and rs.IsPolyCurve( curve_guid ):
        polycurve = rs.coercerhinoobject( curve_guid )
        segment_0 = polycurve.SegmentCurve( 0 ) #error: 'CurveObject' object has no attribute 'SegmentCurve'

Do I have to recreate a RhinoCommon PolyCurve from my rhinoscriptsyntax PolyCurve?

Thanks

Michael

4

Hi @Michael_Meyer,

How about this?

import Rhino
import rhinoscriptsyntax as rs
import scriptcontext as sc

def testme():
    rc = rs.GetCurveObject("Select PolyCurve")
    if not rc:
        return
    
    curve_id = rc[0]
    if rs.IsPolyCurve(curve_id):
        polycurve = rs.coercecurve(curve_id)
        seg0 = polycurve.SegmentCurve(0)
        if seg0:
            seg_id = sc.doc.Objects.AddCurve(seg0)
            seg_obj = sc.doc.Objects.FindId(seg_id)
            seg_obj.Select(True)
            sc.doc.Views.Redraw()
            
if( __name__ == "__main__" ):
    testme()

– Dale

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