Python for AutoCAD performance.

 

Python for AutoCAD performance.

 

Just to give an idea of performance differences between running routines in vs out of process, with essentially the same code. The test is to iterate model space and run transformBy on 41769 Points. The first test is run in visual studio code.

import pythoncom

import win32com.client

from timeit import default_timer as timer

#166.88979500000278 seconds

def comMatrix3d(mat):

        return win32com.client.VARIANT(pythoncom.VT_ARRAY | pythoncom.VT_R8, mat)

   

start = timer()

comMat = comMatrix3d(

    [[1.0, 0.0, 0.0, 100.0],

     [0.0, 1.0, 0.0, 100.0],

     [0.0, 0.0, 1.0, 0.0],

     [0.0, 0.0, 0.0, 1.0]])

acad = win32com.client.Dispatch("AutoCAD.Application")

model = acad.ActiveDocument.ModelSpace

for ent in model:

    if ent.ObjectName == "AcDbPoint":

        ent.TransformBy(comMat)

       

end = timer()

print(end - start)

This second test was run from AutoCAD's command line. I also included a test using PyRx for comparison

#import

import PyRx as Rx

import PyGe as Ge

import PyGi as Gi

import PyDb as Db

import PyAp as Ap

import PyEd as Ed

import traceback

from timeit import default_timer as timer

import win32com.client

import pythoncom

def comMatrix3d(mat : Ge.Matrix3d):

        return win32com.client.VARIANT(pythoncom.VT_ARRAY | pythoncom.VT_R8, mat)

   

# 7.853941000001214 seconds

def PyRxCmd_doitcom():

    try:

        start = timer()

       

        comMat = comMatrix3d(

                [[1.0, 0.0, 0.0, 100.0],

                [0.0, 1.0, 0.0, 100.0],

                [0.0, 0.0, 1.0, 0.0],

                [0.0, 0.0, 0.0, 1.0]])

       

        acad = win32com.client.Dispatch("AutoCAD.Application")

        model = acad.ActiveDocument.ModelSpace

       

        for ent in model:

            if ent.ObjectName == "AcDbPoint":

                ent.TransformBy(comMat)

               

        end = timer()

        print(end - start)

       

    except Exception as err:

        traceback.print_exception(err)

# 0.219937599998957 seconds

def PyRxCmd_doitpyrx():

    try:

        start = timer()

        mat = Ge.Matrix3d()

        mat.setToTranslation(Ge.Point3d(100,100,0).asVector())

       

        db = Db.HostApplicationServices().workingDatabase()

        model =  Db.BlockTableRecord(db.modelSpaceId(), Db.OpenMode.kForRead)

 

        for id in model.objectIds(Db.Point.desc()):

            ent = Db.Entity(id, Db.OpenMode.ForWrite)

            ent.transformBy(mat)

           

        end = timer()

        print(end - start)

       

    except Exception as err:

        print(err)