get distance along alignment from station

New alignment api function to get the horizontal distance along an alignment from a station value
2026-08-10 09:48:32 +00:00 · 2025-03-17 09:12:24 -07:00
parent c176b9d607
commit 09a43f1339
3 changed files with 112 additions and 0 deletions
@@ -0,0 +1,55 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2025 Thomas Krijnen <thomas@aecgeeks.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 pytest
+import ifcopenshell.api.alignment
+import ifcopenshell.api.context
+
+
+def test_add_stationing_to_alignment():
+    file = ifcopenshell.file(schema="IFC4X3_ADD2")
+    project = file.createIfcProject(Name="Test")
+    geometric_representation_context = ifcopenshell.api.context.add_context(file, context_type="Model")
+    axis_model_representation_subcontext = ifcopenshell.api.context.add_context(
+        file,
+        context_type="Model",
+        context_identifier="Axis",
+        target_view="MODEL_VIEW",
+        parent=geometric_representation_context,
+    )
+
+    coordinates = [(500.0, 2500.0), (3340.0, 660.0), (4340.0, 5000.0), (7600.0, 4560.0), (8480.0, 2010.0)]
+    radii = [(1000.0), (1250.0), (950.0)]
+    vpoints = [(0.0, 100.0), (2000.0, 135.0), (5000.0, 105.0), (7400.0, 153.0), (9800.0, 105.0), (12800.0, 90.0)]
+    lengths = [(1600.0), (1200.0), (2000.0), (800.0)]
+
+    alignment = ifcopenshell.api.alignment.create_alignment_by_pi_method(
+        file, "TestAlignment", coordinates, radii, vpoints, lengths
+    )
+
+    # test alignment without stationing referent
+    assert ifcopenshell.api.alignment.distance_along_from_station(file, alignment, 500.0) == pytest.approx(500.0)
+
+    # add stationing referent
+    ifcopenshell.api.alignment.add_stationing_to_alignment(file, alignment, 10000.0)
+
+    # Station 138+83.96
+    assert ifcopenshell.api.alignment.distance_along_from_station(file, alignment, 13883.96) == pytest.approx(3883.96)
+
+    # Station 175+25.36
+    assert ifcopenshell.api.alignment.distance_along_from_station(file, alignment, 17525.36) == pytest.approx(7525.36)