First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2022 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
+import ifcopenshell.util.element
+
+
+def remove_surface_style(file: ifcopenshell.file, style: ifcopenshell.entity_instance) -> None:
+    """Removes a presentation item from a presentation style
+
+    :param style: The IfcPresentationItem to remove.
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        # Create a new surface style
+        style = ifcopenshell.api.style.add_style(model)
+
+        # Create a simple shading colour and transparency.
+        shading = ifcopenshell.api.style.add_surface_style(model,
+            style=style, ifc_class="IfcSurfaceStyleShading", attributes={
+                "SurfaceColour": { "Name": None, "Red": 1.0, "Green": 0.8, "Blue": 0.8 },
+                "Transparency": 0., # 0 is opaque, 1 is transparent
+            })
+
+        # Remove the shading item
+        ifcopenshell.api.style.remove_surface_style(model, style=shading)
+    """
+
+    to_delete = set()
+    if style.is_a("IfcSurfaceStyleWithTextures"):
+        textures = style.Textures
+        if file.schema == "IFC2X3":
+            to_delete.update(textures)
+        else:
+            for texture in textures:
+                if coords := texture.IsMappedBy:
+                    for coordinate in coords:
+                        to_delete.add(coordinate)
+                else:
+                    to_delete.add(texture)
+
+    for attribute in style:
+        if isinstance(attribute, ifcopenshell.entity_instance) and attribute.id():
+            to_delete.add(attribute)
+
+    file.remove(style)
+
+    for element in to_delete:
+        ifcopenshell.util.element.remove_deep2(file, element)