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SimpleCADAPI-master/examples/03_expressions.py

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+"""Expression parameters inside a replayable graph/model workflow.
+
+Run from the repository root with:
+    uv run python examples/03_expressions.py
+"""
+
+import json
+from pathlib import Path
+
+import simplecadapi as scad
+
+
+OUT = Path("examples/out")
+OUT.mkdir(parents=True, exist_ok=True)
+
+
+width = scad.var("width", 24.0, comment="plate width")
+height = scad.var("height", 12.0, comment="plate height")
+thickness = scad.var("thickness", 4.0, comment="plate thickness")
+
+with scad.GraphSession() as session:
+    plate = scad.make_box_rsolid(width, height, thickness)
+    rib = scad.make_box_rsolid(width / 4.0, height, thickness * 2.0)
+    rib = scad.translate_shape(rib, (0.0, 0.0, 4.0))
+    part = scad.union_rsolid(plate, rib)
+
+model_json = scad.export_model_json(session)
+payload = json.loads(model_json)
+(OUT / "expressions.model.json").write_text(model_json, encoding="utf-8")
+
+print("expression_nodes", len(payload["expression_graph"]["nodes"]))
+print("graph_nodes", len(payload["graph"]["nodes"]))
+print("volume", round(part.get_volume(), 3))