9d6ceb8145
Set up PyQt6 + QGraphicsView pipeline-editor skeleton, requirements, pytest headless config, and the actionable implementation plan under docs/plan. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
92 lines
4.5 KiB
Markdown
92 lines
4.5 KiB
Markdown
# Pipeline Network Diagram Editor — Implementation Plan
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A desktop diagram editor for drawing **pipeline networks** (water lines, power lines,
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gas, etc.), built with **PyQt6** on the **QGraphicsView / QGraphicsScene** framework.
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## Tool selection (research outcome)
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| Candidate | Verdict |
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|-----------|---------|
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| **QGraphicsView framework (chosen)** | Maximum control over custom SVG nodes, typed ports, orthogonal grid routing, arc crossings, flow animation. Mature, high item-count performance. |
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| QtNodes (paceholder/nodeeditor) | Dataflow-centric, fixed node visuals, v3 breaking API — poor fit for grid-routed pipeline networks. |
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| QuickQanava (QML) | Modern but connection routing in QML is the hard part; less control over orthogonal/arc routing. |
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Bindings: **PyQt6 6.10** (apt, works with Python 3.14). Tests: **pytest + pytest-qt**,
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headless via `QT_QPA_PLATFORM=offscreen`.
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Sources:
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- <https://github.com/paceholder/nodeeditor>
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- <https://github.com/cneben/QuickQanava>
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- <https://doc.qt.io/qt-6/qtwidgets-graphicsview-elasticnodes-example.html>
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- <https://www.qt.io/blog/2017/01/19/should-you-be-using-qgraphicsview>
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---
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## Phase 0 — Project scaffolding
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- [ ] Repo layout, `requirements.txt`, `README.md`, `.gitignore`
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- [ ] `pipeline_editor` package skeleton + `__main__` entry point
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- [ ] pytest config + headless conftest (QApplication fixture)
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## Phase 1 — Domain model (no UI)
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- [ ] `PropertyType` enum: string, int, float, bool, enum, color, catalogue_item, catalogue_items, value_list
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- [ ] `Property` + `PropertyGroup` (grouped, editable/readonly, validation)
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- [ ] `Catalogue` / `CatalogueItem` registry
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- [ ] `PortRelation` registry (water/power/gas...) with color schemes + compatibility rules
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- [ ] `Port` (id, name, relation, side/offset, direction)
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- [ ] `NodeModel`, `EdgeModel` (ids, geometry, style, property groups)
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- [ ] `DiagramDocument` — holds nodes/edges, emits change signals
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- [ ] JSON serialization / deserialization (round-trip)
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## Phase 2 — Node library (feature #1)
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- [ ] Bundled SVG node graphics (pump, tank, valve, junction, source, sink, transformer…)
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- [ ] `NodeTemplate` = SVG + port configuration, organized into groups
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- [ ] Left dock `NodePanel`: grouped tree with vector previews
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- [ ] Drag-and-drop node template → canvas creates a node
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## Phase 3 — Canvas, scene & nodes
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- [ ] `CanvasView`: zoom (wheel), pan, fit-to-view, rubber-band select
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- [ ] Grid background (dots/lines), configurable size, snap-to-grid
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- [ ] `NodeItem`: renders SVG, movable, selectable, edges follow on move
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- [ ] Multi-select move, delete
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## Phase 4 — Ports & edges (features #2, #3, #5)
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- [ ] Focused node reveals `PortItem` handles
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- [ ] Port relation coloring + connection-compatibility feedback
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- [ ] Drag from port → other node's port (or self) creates an edge
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- [ ] Orthogonal routing along rectangular grid
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- [ ] Config option: draw **arc** at line intersections/crossings
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- [ ] `EdgeItem` styles: line style, head/tail decorations (arrow, circle, diamond, none)
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## Phase 5 — Property panel (feature #4)
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- [ ] Right dock `PropertyPanel`: grouped property editors
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- [ ] Editor widgets per type (string/int/float/bool/enum/color/catalogue/list)
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- [ ] Two-way binding: edit → model → view refresh
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- [ ] Geometry/title (presentation) group + physics group (length, diameter, flow rate, flow type)
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## Phase 6 — Mock calculation & flow animation
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- [ ] `FlowSolver`: mock flow distribution across edges (conservation-ish heuristic)
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- [ ] Per-edge flow value + direction
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- [ ] `FlowAnimator`: animate direction (marching dashes) and volume (speed/width)
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- [ ] Play/pause/stop controls
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## Phase 7 — Editing UX & configuration (added features)
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- [ ] Undo/redo via `QUndoStack` (add/move/delete/connect/edit)
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- [ ] Copy / paste / duplicate / delete
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- [ ] Save / Open / New document (JSON)
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- [ ] Export canvas to PNG / SVG
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- [ ] Config dialog: grid size, snap, arc-on-crossing, color scheme, animation speed
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- [ ] Multiple color schemes (light/dark + relation palettes)
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- [ ] Toolbar + menus + status bar + keyboard shortcuts
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## Phase 8 — Tests (typical scenarios)
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- [ ] Model: properties, catalogue, relations, serialization round-trip
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- [ ] Routing: orthogonal path + arc-crossing generation
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- [ ] Flow solver: conservation & direction on a small network
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- [ ] Scene: create node via drop, connect ports, move node moves edge, delete cascades
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- [ ] Property panel: edit propagates to model
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- [ ] Undo/redo of add/move/connect/delete
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## Phase 9 — Polish
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- [ ] README with run/test instructions and screenshots
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- [ ] Final pass: lint, docstrings, sample document
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