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ocaf_data_framework.py
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ocaf_data_framework.py
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#!/usr/bin/env python
#
# Copyright 2022 Doug Blanding (dblanding@gmail.com)
#
# This file contains the PythonOCC equivalent code for the C++ code
# presented in the Open CASCADE Technology OCAF Documentation at:
# https://dev.opencascade.org/doc/overview/html/occt_user_guides__ocaf.html
# It has lots of extra snippets of code and print() functions
# sprinkled in to allow a student to explore the details of OCAF
# labels and attributes while using PythonOCC rather than C++.
# :-)
from OCC.Core.TCollection import (TCollection_AsciiString,
TCollection_ExtendedString)
from OCC.Core.TDataStd import TDataStd_Integer
from OCC.Core.TDocStd import TDocStd_Document
from OCC.Core.TDF import (TDF_Tool, TDF_TagSource,
TDF_ChildIterator,)
def get_entry(label):
"""Return entry of label"""
entry_str = TCollection_AsciiString()
TDF_Tool.Entry(label, entry_str)
entry = entry_str.ToCString()
return entry
# Create a document
title = "Main document"
doc = TDocStd_Document(TCollection_ExtendedString(title))
root = doc.Main()
# 2 ways to get label entry
print(f"root entry : [{doc.Main().EntryDumpToString()}]")
print(f"doc_root entry: [{doc.Main().Root().EntryDumpToString()}]")
print(f"{get_entry(doc.Main()) = }")
print(f"{get_entry(doc.Main().Root()) = }")
# Tag
# Creating child labels using random delivery of tags
child1 = TDF_TagSource.NewChild(root)
child2 = TDF_TagSource.NewChild(root)
print(get_entry(root)) # 0:1
print(get_entry(child1)) # 0:1:1
print(get_entry(child2)) # 0:1:2
# Creation of a child label by user delivery from a tag
a_child = root.FindChild(27, True) # new label is created
if not a_child.IsNull():
tag = a_child.Tag()
print(f"{tag = }")
a_child = root.FindChild(27, False) # new label is not created
if not a_child.IsNull():
a_tag = a_child.Tag()
print(f"{a_tag = }") # But it is still found
# Label
# Label creation
root_label_depth = root.Depth()
print(f"\n{root_label_depth = }") # 1
print(f"root label entry is {get_entry(root)}\n") # 0:1
# Creating child labels
# 0 : ( doc.Root() )
# |
# 0 : 1 (root)
# | |
# 0 : 1 : 1
# | |
# 0 : 1 : 2
# | |
# 0 : 1 : 3
# | |
# 0 : 1 : 27
# |
# 0 : 8 (lab1)
# | |
# 0 : 8 : 7 (lab2)
# | |
# 0 : 8 : 2 (lab3)
# |
# 0 : 3 (level1)
# | |
# 0 : 3 : 7 (level2)
#
# creating a label with tag 8 at Root
lab1 = doc.Main().Root().FindChild(8)
print(f"Entry of lab1: {get_entry(lab1)}")
# creating labels 7 and 2 on label 8
lab2 = lab1.FindChild(7)
lab3 = lab1.FindChild(2)
level1 = root.FindChild(3)
level2 = level1.FindChild(1)
# Retrieving child labels
itl = TDF_ChildIterator()
itl.Initialize(root)
print("Entries of children of root:")
while itl.More():
a_child = itl.Value()
print(f"\t[{get_entry(a_child)}]")
itl.Next()
# Retrieving the father label
father = lab3.Father()
print(f"father of lab3 is {get_entry(father)}")
isroot = father.IsRoot()
print(f"father is root: {isroot}")
father = lab1.Father()
print(f"father of lab1 is {get_entry(father)}")
isroot = father.IsRoot()
print(f"father is root: {isroot}")
# Attribute
# Retrieving an attribute from a label
current = level1
INT = TDataStd_Integer()
if current.FindAttribute(TDataStd_Integer.GetID(), INT):
print("Found it")
else:
print("Didn't find it")
# Identifying an attribute using a GUID
guid = INT.ID()
print(f"{current = }") # <class 'TDF_Label'>
print(f"{INT = }") # <class 'TDataStd_Integer'>
print(f"{guid = }") # <class 'Standard_GUID'>
# Attaching an attribute to a label
current.AddAttribute(INT)
attach = INT.Label()
print(f"{attach = }") # <class 'TDF_Label'>
# Try again to retrieve an attribute from a label
if current.FindAttribute(TDataStd_Integer.GetID(), INT):
print("Found it")
else:
print("Didn't find it")
# Testing the attachment to a label
if current.HasAttribute():
nb_att = current.NbAttributes()
print(f"The label has {nb_att} attribute(s) attached")
# Removing an attribute from a label
current.ForgetAttribute(guid)
# Test again the attachment to a label
nb_att = current.NbAttributes()
print(f"The label has {nb_att} attribute(s) attached")