First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcOpenShell is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+import ifcopenshell
+
+
+def map_representation(
+    file: ifcopenshell.file, representation: ifcopenshell.entity_instance
+) -> ifcopenshell.entity_instance:
+    usecase = Usecase()
+    usecase.file = file
+    return usecase.execute(representation)
+
+
+class Usecase:
+    file: ifcopenshell.file
+
+    def execute(self, representation: ifcopenshell.entity_instance) -> ifcopenshell.entity_instance:
+        self.representation = representation
+        mapping_source = self.get_mapping_source()
+
+        zero = self.file.createIfcCartesianPoint((0.0, 0.0, 0.0))
+        x_axis = self.file.createIfcDirection((1.0, 0.0, 0.0))
+        y_axis = self.file.createIfcDirection((0.0, 1.0, 0.0))
+        z_axis = self.file.createIfcDirection((0.0, 0.0, 1.0))
+
+        mapping_target = self.file.createIfcCartesianTransformationOperator3D(x_axis, y_axis, zero, 1, z_axis)
+        mapped_item = self.file.createIfcMappedItem(mapping_source, mapping_target)
+        return self.file.create_entity(
+            "IfcShapeRepresentation",
+            **{
+                "ContextOfItems": representation.ContextOfItems,
+                "RepresentationIdentifier": representation.RepresentationIdentifier,
+                "RepresentationType": "MappedRepresentation",
+                "Items": [mapped_item],
+            }
+        )
+
+    def get_mapping_source(self) -> ifcopenshell.entity_instance:
+        for inverse in self.file.get_inverse(self.representation):
+            if inverse.is_a("IfcRepresentationMap"):
+                return inverse
+        zero = self.file.createIfcCartesianPoint((0.0, 0.0, 0.0))
+        x_axis = self.file.createIfcDirection((1.0, 0.0, 0.0))
+        z_axis = self.file.createIfcDirection((0.0, 0.0, 1.0))
+        mapping_origin = self.file.createIfcAxis2Placement3D(zero, z_axis, x_axis)
+        return self.file.createIfcRepresentationMap(
+            MappingOrigin=mapping_origin, MappedRepresentation=self.representation
+        )