Get Polygon intersection with Python and shapely

[Danielm103]

from pyrx import Rx, Ge, Gi, Db, Ap, Ed
import traceback
from shapely import Polygon


@Ap.Command()
def doit():
    try:
        db = Db.curDb()

        desc = Db.Polyline.desc()
        ps, id1, _ = Ed.Editor.entSel("\nPline1 :", desc)
        ps, id2, _ = Ed.Editor.entSel("\nPline2 :", desc)

        pline1 = Db.Polyline(id1)
        pline2 = Db.Polyline(id2)

        polygon1 = Polygon(pline1.toList())
        polygon2 = Polygon(pline2.toList())

        res = polygon1.intersection(polygon2)

        pl3 = Db.Polyline(list(res.exterior.coords))
        pl3.setColorIndex(1)
        db.addToModelspace(pl3)

        print(res.area, pl3.getArea())

    except Exception as err:
        traceback.print_exception(err)

 

[Danielm103]

no bulges though

[BIGAL]

Not sure how this compares to Bpoly, pick point, then use entlast. I can see do multiple objects in one go though.

Edited May 15 by BIGAL

[Danielm103]

With shapely, you can make computations without the having the entities in the drawing.  There are other calculations too

https://shapely.readthedocs.io/en/stable/manual.html  

 

[Danielm103]

12 minutes ago, BIGAL said:

Not sure how this compares to Bpoly, pick point, then use entlast. I can see do multiple objects in one go though.

It’s just another tool in the toolbox, right? acedTraceBoundary is a good option too

[BIGAL]

I can see from the images the functions would be very handy at times. Often need to go to a mathematical solution to get a formula and hopefully some one has done that formula in say Lisp or Python.

 

Have you thought about putting together a Word doc with your "Tools" no code just images etc and what they do. I have one for my lisps, it was created for the staff where I used to work.35 pages,  around 3 lisps per page, keep adding and updating the file, something I need to do. The tools your providing are very useful.

Edited May 16 by BIGAL

[SLW210]

10 hours ago, Danielm103 said:

With shapely, you can make computations without the having the entities in the drawing.  There are other calculations too

https://shapely.readthedocs.io/en/stable/manual.html  

 

 

I was about to ask you for the link.