Python for AutoCAD performance pt2

 

While playing with win32com, I noticed there’s a function to generate a cache:

        acad = win32com.client.gencache.EnsureDispatch("AutoCAD.Application")

 This function made a huge difference with both an and out or process, worthy of a post, this is out of process, see the times in the code comments

import pythoncom

import win32com.client

from timeit import default_timer as timer

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]])

#166.88979500000278 without cache

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

#40.01999249999972 with cache

acad = win32com.client.gencache.EnsureDispatch("AutoCAD.Application")

model = acad.ActiveDocument.ModelSpace

for ent in model:

    if ent.ObjectName == "AcDbPoint":

        ent.TransformBy(comMat)

       

end = timer()

print(end - start)

 and in process  

#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]])

       

        # 7.853941000001214 seconds

        # this will use the cache if its found, in this case

        # the performance is the same as below

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

       

        #1.0649678999998287

        acad = win32com.client.gencache.EnsureDispatch("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)