I am trying to write a python script that will create a new object attribute containing the parcel area for any number of parcels I’ve selected in the scene. I know I need to use Export (Reporting) python script to fetch the value of a rule attribute.
Proposed method:
- Select the desired parcels in the scene
- Run a python script that assigns the CGA rule “calculateParcelArea.cga” to each of the parcels, generates the models using “calculateParcelArea.cga”, and reports the area in the Parcel_Area row, under the sum column.
- The python script then fetches the reports for each of the parcels, creates a new object attribute named ‘parcelArea’ for each parcel, and assigns the reported value.
So far I’ve written a regular python (Module: Main) script that assigns the “calculateParcelArea.cga” to the selected parcels, generates the models with areas saved to rule attribute ‘parcelArea_Calc’, and reports the value.
I’m having difficulty with the Export (Reporting) python module. Can someone help me make sense of this? How do I bring the existing script into the Export (Reporting) python module to complete the task?
Thanks!
Python script and CGA rule below:
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'''
Created on 2017-07-26
@author: bcbd
'''
from scripting import *
# get a CityEngine instance
ce = CE()
def parcelArea():
shapes = ce.getObjectsFrom(ce.selection, ce.isShape)
for shape in shapes:
ce.setRuleFile(ce.selection(), 'calculateParcelArea.cga')
# assign CGA rule calcParcelArea
ce.setStartRule(ce.selection(), 'Lot')
ce.generateModels(ce.selection())
if __name__ == '__main__':
parcelArea()
pass
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/**
* File: calculateParcelArea.cga
*/
version “2017.0”
attr parcelArea_Calc = geometry.area
Lot -->
report("Parcel_Area", parcelArea_Calc)
print("Parcel_Area: " + parcelArea_Calc)
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