使用python的Catia草图约束

Question

我正试着用Python在CATIA V5上画一幅草图。我使用在VB中制作的Catia宏。但是错误仍然存在。我不能限制素描。以下是我的代码，以及我得到的错误：

from win32com.client import constants, Dispatch
import math as m

# Binding python session into CATIA
CATIA = Dispatch("CATIA.Application")
#Création du document
mon_document_piece = CATIA.Documents.Add("Part")
ma_piece = mon_document_piece.Part
mes_corps_de_piece = ma_piece.Bodies

#Définition de l'objet de travail
corps_de_travail = mes_corps_de_piece.Item("Corps principal")
ma_piece.InWorkObject = corps_de_travail
mes_esquisses = corps_de_travail.Sketches
#Choix de l'élément de référence pour crer l'esquisse, ici le plan XY
ma_reference = ma_piece.originElements.PlaneYZ
mon_esquisse = mes_esquisses.Add(ma_reference)

#Définir l'objet de travail
ma_piece.InWorkObject = mon_esquisse
#Edition de l'esquisse
ma_construction2D = mon_esquisse.OpenEdition()
droite_A = ma_construction2D.CreateLine(A/2, 0 , A/2, Ddia+A)
droite_Ddia = ma_construction2D.CreateLine(0, Ddia/2 , Ddia+A, Ddia/2)
cercle_Jr = ma_construction2D.CreateClosedCircle(A/2-Jr,Ddia/2-Jr,Jr)
droite_beta = ma_construction2D.CreateLine(0, 0 ,L, 0)
contraintes = mon_esquisse.Constraints
tangence_beta = contraintes.AddBiEltCst(constants.catCstTypeTangency, cercle_Jr, droite_beta)
tangence_beta.Mode = constants.catCstModeDrivingDimension
      
#Sortie de l'esquisse
mon_esquisse.CloseEdition()

ma_piece.Update()

下面是得到的错误：

Traceback (most recent call last):

  File "C:\Users\Documents\CodeErreur.py", line 54, in <module>
    tangence_beta = contraintes.AddBiEltCst(constants.catCstTypeTangency, cercle_Jr, droite_beta)

  File "C:\Users\Anaconda3\lib\site-packages\win32com\client\__init__.py", line 178, in __getattr__
    raise AttributeError(a)

AttributeError: catCstTypeTangency

我已经尝试了主题中的答案:使用Python时的Catia枚举值。但它对我不起作用。你能帮帮我吗？

Answer 1

catCstTypeTangency不是win32com.client.constants的成员，因为它独立于Catia。

如果您查看CAA V5 Visual Basic帮助，您可以找到约束类型和约束模式的枚举：

enum CatConstraintType {
  catCstTypeReference,
  catCstTypeDistance,
  catCstTypeOn,
  catCstTypeConcentricity,
  catCstTypeTangency,
  catCstTypeLength,
  catCstTypeAngle,
  catCstTypePlanarAngle,
  catCstTypeParallelism,
  catCstTypeAxisParallelism,
  catCstTypeHorizontality,
  catCstTypePerpendicularity,
  catCstTypeAxisPerpendicularity,
  catCstTypeVerticality,
  catCstTypeRadius,
  catCstTypeSymmetry,
  catCstTypeMidPoint,
  catCstTypeEquidistance,
  catCstTypeMajorRadius,
  catCstTypeMinorRadius,
  catCstTypeSurfContact,
  catCstTypeLinContact,
  catCstTypePoncContact,
  catCstTypeChamfer,
  catCstTypeChamferPerpend,
  catCstTypeAnnulContact,
  catCstTypeCylinderRadius,
  catCstTypeStContinuity,
  catCstTypeStDistance,
  catCstTypeSdContinuity,
  catCstTypeSdShape
}

enum CatConstraintMode {
  catCstModeDrivingDimension,
  catCstModeDrivenDimension
}

这意味着catCstTypeTangency == 4和catCstModeDrivingDimension == 0

只需使用以下命令：

tangence_beta = contraintes.AddBiEltCst(4, cercle_Jr, droite_beta)
tangence_beta.Mode = 0  # doesn't make sense for a tangency constrait