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/>.
+from typing import Any
+
+import ifcopenshell
+
+
+def unassign_representation_styles(
+    file: ifcopenshell.file,
+    shape_representation: ifcopenshell.entity_instance,
+    styles: list[ifcopenshell.entity_instance],
+    should_use_presentation_style_assignment: bool = False,
+) -> None:
+    """Unassigns styles directly assigned to an object representation
+
+    This does the inverse of assign_representation_styles.
+
+    :param shape_representation: The IfcShapeRepresentation of the object
+        that you want to unassign styles from.
+    :param styles: A list of presentation styles, typically IfcSurfaceStyle.
+        The number of items in the list should correlate with the number of
+        items in the shape_representation's Items attribute. If you have
+        more items than styles, the last style is used.
+    :param should_use_presentation_style_assignment: This is a technical
+        detail to accomodate a bug in Revit. This should always be left as
+        the default of False, unless you are finding that colours aren't
+        showing up in Revit. In that case, set it to True, but keep in mind
+        that this is no longer a valid IFC. Blame Autodesk.
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        ifcopenshell.api.style.unassign_representation_styles(model,
+            shape_representation=representation, styles=[style])
+    """
+    usecase = Usecase()
+    usecase.file = file
+    usecase.settings = {
+        "shape_representation": shape_representation,
+        "styles": styles or [],
+        "should_use_presentation_style_assignment": should_use_presentation_style_assignment,
+    }
+    return usecase.execute()
+
+
+class Usecase:
+    file: ifcopenshell.file
+    settings: dict[str, Any]
+
+    def execute(self):
+        if not self.settings["styles"]:
+            return []
+        self.results = []
+        use_style_assignment = self.file.schema == "IFC2X3" or self.settings["should_use_presentation_style_assignment"]
+
+        for element in self.file.traverse(self.settings["shape_representation"]):
+            if not element.is_a("IfcShapeRepresentation"):
+                continue
+            for item in element.Items:
+                if not item.is_a("IfcGeometricRepresentationItem"):
+                    continue
+
+                if not item.StyledByItem:
+                    continue
+
+                item = item.StyledByItem[0]
+                if use_style_assignment:
+                    for style_ in item.Styles:
+                        if style_.is_a("IfcPresentationStyleAssignment"):
+                            self.remove_styles(style_)
+                self.remove_styles(item)
+
+    def remove_styles(self, item):
+        """Removes styles from a styled item or a style assignment
+        and purges item if doesn't have any styles after"""
+        styles = [s for s in item.Styles if s not in self.settings["styles"]]
+        if not styles:
+            self.file.remove(item)
+        elif len(styles) != len(item.Styles):
+            item.Styles = styles