Hi Thomas,
Thank you for your answers.
Following your advices, I had a look to the 52 posts on the OCC forum that
are returned when searching with the keyword "unit", but none are
interesting. They are either irrelevant, or without answer.
I had however a look to the *.cdl file in Units and UnitsAPI folder.
UnitsAPI.cdl is quite interesting and describes a large number of method to
achieve conversion.
However, I cannot use it in PythonOCC and don't know why.
I am quite sure it is because I am unfamiliar with Python at the moment.
For instance, typing:
from OCC.UnitsAPI import *
if __name__ == '__main__':
u = UnitsAPI()
u.CurrentUnit("LENGTH")
returns:
Traceback (most recent call last):
File "L:\[coding]\python\pythonOCC_units\unitManagementTest.py", line 13,
in <module>
u.CurrentUnit("LENGTH")
RuntimeError: Standard_NoSuchObject
I have understood that 2 "configuration" files are needed so that UnitsAPI
and Units work:
Lexi_Expr.dat
=> a file into which are defined math symbols and unit prefixes so that the
math parser can work. It looks pretty interesting, but I am not sure it is
really useful, except maybe for parametric values. I don't know how pyOCC
PAF works, but if you need to set for the parameter A a value of "B+C",
this tool should be able to understand the mathematical meaning of this.
It is also able to understand for instance the k in "10 km" as an
indication to multiply the value by a factor 10e3, and this for the
miscellaneous prefixes for each defined units.
Units_Sentence.cdl, Units_UnitSentence.cdl and Units_MathSentence.cdl are
the files indicating the methods to use it.
Units.dat
=> a file defining the unit. Fortunately, the concept of unit signature is
already implemented actually: a very interesting surprise!
Thomas, I understandd that to work in a normal OCC environment, the
variable "CASROOT" needs to be defined so that OCC is able to retrieve
these files through the following variables:
set CSF_UnitsLexicon=%CASROOT%\src\UnitsAPI\Lexi_Expr.dat
set CSF_UnitsDefinition=%CASROOT%\src\UnitsAPI\Units.dat
How does it work with PythonOCC?
I have installed PythonOCC all in one, but I couldn't find those file where
I installed PythonOCC: where are the OCC sources installed?
And do you think that I should define manually these environment variables
so that PythonOCC is able to find them?
I thank you in advance for your help.
Have a good day.
Bests,
Pierre
PS: if we succeed using this API, would you be interested that I write a
python sample to include in PythonOC?
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