Jerry
107 lines
3.9 KiB
Markdown
107 lines
3.9 KiB
Markdown
# SimpleCAD API Core Classes Documentation
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This directory documents the core public object model for SimpleCADAPI.
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SimpleCADAPI is OCP-native at runtime: public geometry objects are thin Python wrappers around OpenCascade/OCP shapes exposed through the `.wrapped` attribute. The package provides functional modeling operations, expression parameters, QL selectors, and replayable model JSON.
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## Core Classes Overview
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### Coordinate and tagging utilities
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#### [CoordinateSystem](coordinate_system.md)
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A right-handed 3D coordinate system for local modeling contexts and point/vector transformation.
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#### [SimpleWorkplane](simple_workplane.md)
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A context manager for temporarily modeling in a local coordinate system.
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#### [TaggedMixin](tagged_mixin.md)
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Shared tag and metadata behavior for geometry wrappers.
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### Geometry wrappers
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#### [Vertex](vertex.md)
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A 0D topology wrapper with coordinate queries.
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#### [Edge](edge.md)
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A 1D topology wrapper for lines, arcs, circles, splines, and other curve edges.
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#### [Wire](wire.md)
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A connected path made from edges. Wires may be open or closed.
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#### [Face](face.md)
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A bounded surface with an outer wire and optional inner wires.
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#### [Solid](solid.md)
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A closed 3D body with volume, faces, edges, tags, and metadata.
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#### [Compound](compound.md)
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A collection wrapper for multiple geometry objects.
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### Product semantics roadmap
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#### [Part and Assembly Development Plan](part_assembly_development_plan.md)
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Planned single-body `Part`, material assignment, component placement, and `Assembly` semantics layered above the current topology/geometry and operation graph model.
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## Relationship Diagram
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```text
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TaggedMixin
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├── Vertex (0D)
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├── Edge (1D)
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├── Wire (1D) ← composed of edges
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├── Face (2D) ← bounded by wires
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├── Solid (3D) ← bounded by faces
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└── Compound ← collection of shapes
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CoordinateSystem ← independent utility
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SimpleWorkplane ← local modeling context
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```
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## Design Principles
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- **Shape-first API**: users work with `Vertex`, `Edge`, `Wire`, `Face`, and `Solid`, not graph nodes.
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- **Functional modeling style**: public operations return new geometry values, e.g. `make_box_rsolid(...)`, `cut_rsolid(...)`, `fillet_rsolid(...)`.
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- **OCP-native runtime**: geometry construction, topology traversal, properties, booleans, transforms, and export use OCP/OpenCascade helpers.
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- **Replayable graph workflows**: `GraphSession` can record a canonical low-level operation graph and `export_model_json()` can serialize it for `replay_model_json()`.
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- **Tags and metadata**: tags are useful for lightweight semantics; structured numeric facts should be stored in metadata such as `metadata["geo"]`.
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- **Indexed topology access**: use plural methods such as `get_edges()` and `get_faces()` for enumeration, and pass an index to the same getter, such as `get_edges(index)` or `get_faces(index)`, for intentional indexed picks that should become graph selection nodes.
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## Basic Usage
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```python
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import simplecadapi as scad
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with scad.SimpleWorkplane(origin=(0, 0, 0)):
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box = scad.make_box_rsolid(width=5, height=3, depth=2)
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scad.apply_tag(box, "role.bracket")
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box.set_metadata("material", "6061-T6")
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box.auto_tag_faces("box")
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top_faces = [face for face in box.get_faces() if "face.top" in scad.list_tags(face)]
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print(len(top_faces))
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```
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## Replayable Model JSON
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```python
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import simplecadapi as scad
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with scad.GraphSession() as session:
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body = scad.make_box_rsolid(10, 10, 4)
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hole = scad.make_cylinder_rsolid(1.5, 8, bottom_face_center=(0, 0, -2))
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part = scad.cut_rsolid(body, hole)
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payload = scad.export_model_json(session)
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rebuilt = scad.replay_model_json(payload)
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print(len(rebuilt))
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```
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## More Resources
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- [API Reference Documentation](../api/)
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- [Examples](../../examples/)
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- [User Guide](../../README.md)
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- [JSON Operation Graph Spec](operation_graph_json_spec.md)
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- [Serialization and Replay Operation Guides](serialization/)
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