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https://github.com/IfcOpenShell/IfcOpenShell.git
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Dion Moult
79 lines
3.0 KiB
Python
79 lines
3.0 KiB
Python
# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
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#
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# This file is part of IfcOpenShell.
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#
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# IfcOpenShell is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# IfcOpenShell is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with IfcOpenShell. If not, see <http://www.gnu.org/licenses/>.
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import ifcopenshell
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import ifcopenshell.api.pset
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import ifcopenshell.util.element
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def add_georeferencing(file: ifcopenshell.file) -> None:
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"""Add empty georeferencing entities to a model
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By default, models are not georeferenced. Georeferencing requires two
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entities: a definition of the projected coordinated reference system
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(CRS) used, and the transformation parameters between any local coordinate
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system and that projected CRS if any.
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This function will create the entities to store the projected CRS and
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map conversion transformation, but will leave all the parameters blank.
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It is this the users responsibility to specify the correct
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georeferencing parameters. See
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ifcopenshell.api.georeference.edit_georeferencing.
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:return: None
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:rtype: None
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Example:
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.. code:: python
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ifcopenshell.api.run("georeference.add_georeferencing", model)
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"""
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if file.schema == "IFC2X3":
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if not (project := file.by_type("IfcProject")):
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return
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project = project[0]
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if ifcopenshell.util.element.get_pset(project, "ePSet_ProjectedCRS"):
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return
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conversion = ifcopenshell.api.pset.add_pset(file, project, "ePSet_MapConversion")
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crs = ifcopenshell.api.pset.add_pset(file, project, "ePSet_ProjectedCRS")
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ifcopenshell.api.pset.edit_pset(file, crs, properties={"Name": ""})
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ifcopenshell.api.pset.edit_pset(
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file,
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conversion,
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properties={
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"Eastings": file.createIfcLengthMeasure(0),
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"Northings": file.createIfcLengthMeasure(0),
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"OrthogonalHeight": file.createIfcLengthMeasure(0),
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},
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)
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return
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if file.by_type("IfcProjectedCRS"):
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return
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source_crs = None
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for context in file.by_type("IfcGeometricRepresentationContext", include_subtypes=False):
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if context.ContextType == "Model":
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source_crs = context
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break
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if not source_crs:
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return
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projected_crs = file.create_entity("IfcProjectedCRS", Name="")
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file.create_entity(
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"IfcMapConversion", SourceCRS=source_crs, TargetCRS=projected_crs, Eastings=0, Northings=0, OrthogonalHeight=0
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)
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