Summary
kerf-engine is 67% complete across 3 milestones. $41.85 spent. Currently executing M003/S01.
2/3Milestones
6/9Slices
planningPhase
$41.85Cost
51.67MTokens
2h 0mDuration
986Tool calls
37Units
3Remaining
17.6/hrRate
$6.98Cost/slice
52.4kTokens/tool
100.0%Cache hit
M002Scope
67%
Executing M003/S01 — Export Flow (View 3) + DXF Generation
ETA: ~10m 15s remaining (3 slices at 17.6/hr)
Blockers
No blockers or high-risk items found.
Progress
M001 Kerf Engine — Raster-to-Vector Pipeline & API 3/3
S01 Core Pipeline — Preprocessing + Vectorization high — dependency installation, OpenCV+Potrace+VTracer integration critical
untested
S02 Post-Processing + Output Formats (SVG, DXF, JSON) high — DXF generation quality is hard to validate programmatically S01 critical
provides: postprocess_svg() function for RDP simplification + island detection + node countingprovides: Output generators: generate_dxf(), generate_json(), generate_svg()provides: /engine/simplify endpoint for SVG-to-SVG/DXF/JSON simplificationprovides: output_format routing on /engine/trace (svg, dxf, json)provides: _format_response() pattern for consistent multi-format responsesrequires: Core pipeline: preprocessing + potrace_trace() + vtracer_trace() producing raw SVG output
passed
Decisions
- DXF output as raw bytes with application/dxf content-type and metadata in X-Kerf-Metadata header
- postprocess_svg() replaces regex metadata extraction — full XML path parsing for structured PathInfo objects
- _format_response() shared helper for consistent response shaping across endpoints
- Islands placed on separate ISLANDS layer in DXF for downstream CAM tool compatibility
- Bezier curves linearized during post-processing for RDP simplification and DXF polyline generation
Patterns
- PostProcessResult as the universal intermediate representation consumed by all output generators
- Output generators are pure functions: PostProcessResult → bytes/string, no side effects
- _format_response() pattern for consistent multi-format API responses with metadata
S03 Preset System + Engine Docker Packaging low — presets are config files; Docker packaging is well-understood S02 critical
provides: Preset system with 5 tuned configs and merge-based param resolutionprovides: GET /engine/presets endpointprovides: Docker image kerf-engine:dev with healthcheckprovides: GET /engine/health endpointrequires: Post-processing pipeline and output format generators (SVG, DXF, JSON) consumed by preset-driven trace flow
passed
Decisions
- Preset default is 'sign' — covers the most common use case
- Presets use flat JSON with three sections (preprocessing, vectorization, postprocessing)
- resolve_params merges preset → user_params with user taking precedence
- Custom preset has empty param sections so pipeline defaults apply unless user provides overrides
- Multi-stage Docker build separates build deps from runtime (smaller image, no compiler tools)
- Engine image contains only engine source — enforces Engine/App separation (D001)
- Health endpoint at /engine/health for namespace consistency with other /engine/* routes
Patterns
- Preset-driven pipeline configuration: presets define defaults, user params override
- Multi-stage Docker build pattern for Python+C extension packages (pypotrace)
- Dual health endpoints: /health (root) for simple checks, /engine/health (namespaced) for Docker/orchestration
M002 M002: React Frontend — Import & Convert UI + Design Canvas 3/3
S01 Import & Convert UI (View 1) medium — debounced preview updates, Engine API integration from browser critical
untested
S02 Design Canvas Core (View 2) medium — Konva.js setup, selection handles, undo/redo state management S01 critical
provides: postprocess_svg() function for RDP simplification + island detection + node countingprovides: Output generators: generate_dxf(), generate_json(), generate_svg()provides: /engine/simplify endpoint for SVG-to-SVG/DXF/JSON simplificationprovides: output_format routing on /engine/trace (svg, dxf, json)provides: _format_response() pattern for consistent multi-format responsesrequires: Core pipeline: preprocessing + potrace_trace() + vtracer_trace() producing raw SVG output
passed
Decisions
- DXF output as raw bytes with application/dxf content-type and metadata in X-Kerf-Metadata header
- postprocess_svg() replaces regex metadata extraction — full XML path parsing for structured PathInfo objects
- _format_response() shared helper for consistent response shaping across endpoints
- Islands placed on separate ISLANDS layer in DXF for downstream CAM tool compatibility
- Bezier curves linearized during post-processing for RDP simplification and DXF polyline generation
Patterns
- PostProcessResult as the universal intermediate representation consumed by all output generators
- Output generators are pure functions: PostProcessResult → bytes/string, no side effects
- _format_response() pattern for consistent multi-format API responses with metadata
S03 Text System + Font Loading medium — opentype.js integration, font loading from volume, path extraction accuracy S02 critical
provides: Preset system with 5 tuned configs and merge-based param resolutionprovides: GET /engine/presets endpointprovides: Docker image kerf-engine:dev with healthcheckprovides: GET /engine/health endpointrequires: Post-processing pipeline and output format generators (SVG, DXF, JSON) consumed by preset-driven trace flow
passed
Decisions
- Preset default is 'sign' — covers the most common use case
- Presets use flat JSON with three sections (preprocessing, vectorization, postprocessing)
- resolve_params merges preset → user_params with user taking precedence
- Custom preset has empty param sections so pipeline defaults apply unless user provides overrides
- Multi-stage Docker build separates build deps from runtime (smaller image, no compiler tools)
- Engine image contains only engine source — enforces Engine/App separation (D001)
- Health endpoint at /engine/health for namespace consistency with other /engine/* routes
Patterns
- Preset-driven pipeline configuration: presets define defaults, user params override
- Multi-stage Docker build pattern for Python+C extension packages (pypotrace)
- Dual health endpoints: /health (root) for simple checks, /engine/health (namespaced) for Docker/orchestration
M003 M003 0/3 critical path
S01 Export Flow (View 3) + DXF Generation high — DXF scale accuracy and geometry quality critical
untested
S02 Docker Packaging + README low — Docker packaging is well-understood pattern S01 critical
provides: postprocess_svg() function for RDP simplification + island detection + node countingprovides: Output generators: generate_dxf(), generate_json(), generate_svg()provides: /engine/simplify endpoint for SVG-to-SVG/DXF/JSON simplificationprovides: output_format routing on /engine/trace (svg, dxf, json)provides: _format_response() pattern for consistent multi-format responsesrequires: Core pipeline: preprocessing + potrace_trace() + vtracer_trace() producing raw SVG output
passed
Decisions
- DXF output as raw bytes with application/dxf content-type and metadata in X-Kerf-Metadata header
- postprocess_svg() replaces regex metadata extraction — full XML path parsing for structured PathInfo objects
- _format_response() shared helper for consistent response shaping across endpoints
- Islands placed on separate ISLANDS layer in DXF for downstream CAM tool compatibility
- Bezier curves linearized during post-processing for RDP simplification and DXF polyline generation
Patterns
- PostProcessResult as the universal intermediate representation consumed by all output generators
- Output generators are pure functions: PostProcessResult → bytes/string, no side effects
- _format_response() pattern for consistent multi-format API responses with metadata
S03 Embed Mode medium — Shadow DOM + Konva.js + font loading interactions S02 critical
provides: Preset system with 5 tuned configs and merge-based param resolutionprovides: GET /engine/presets endpointprovides: Docker image kerf-engine:dev with healthcheckprovides: GET /engine/health endpointrequires: Post-processing pipeline and output format generators (SVG, DXF, JSON) consumed by preset-driven trace flow
passed
Decisions
- Preset default is 'sign' — covers the most common use case
- Presets use flat JSON with three sections (preprocessing, vectorization, postprocessing)
- resolve_params merges preset → user_params with user taking precedence
- Custom preset has empty param sections so pipeline defaults apply unless user provides overrides
- Multi-stage Docker build separates build deps from runtime (smaller image, no compiler tools)
- Engine image contains only engine source — enforces Engine/App separation (D001)
- Health endpoint at /engine/health for namespace consistency with other /engine/* routes
Patterns
- Preset-driven pipeline configuration: presets define defaults, user params override
- Multi-stage Docker build pattern for Python+C extension packages (pypotrace)
- Dual health endpoints: /health (root) for simple checks, /engine/health (namespaced) for Docker/orchestration
Timeline
| # | Type | ID | Model | Started | Duration | Cost | Tokens | Tools | Tier | Routed | Trunc | CHF |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | execute-task | M001/S01/T01 | opus-4-6 | Mar 26, 2026, 04:00 AM | 6m 19s | $1.14 | 1.31M | 39 | ||||
| 2 | execute-task | M001/S01/T02 | opus-4-6 | Mar 26, 2026, 04:07 AM | 3m 41s | $0.976 | 1.03M | 30 | ||||
| 3 | execute-task | M001/S01/T03 | opus-4-6 | Mar 26, 2026, 04:11 AM | 3m 59s | $1.12 | 1.29M | 34 | ||||
| 4 | execute-task | M001/S01/T04 | opus-4-6 | Mar 26, 2026, 04:15 AM | 3m 29s | $0.0000 | 0 | 0 | ||||
| 5 | execute-task | M001/S01/T05 | opus-4-6 | Mar 26, 2026, 04:18 AM | 4m 8s | $1.37 | 1.35M | 40 | ||||
| 6 | complete-slice | M001/S01 | opus-4-6 | Mar 26, 2026, 04:22 AM | 3m 19s | $0.734 | 655.6k | 21 | ||||
| 7 | complete-slice | M001/S01 | opus-4-6 | Mar 26, 2026, 04:25 AM | 2m 4s | $0.796 | 881.5k | 30 | ||||
| 8 | execute-task | M001/S02/T01 | opus-4-6 | Mar 26, 2026, 04:28 AM | 4m 27s | $1.42 | 1.43M | 29 | ||||
| 9 | execute-task | M001/S02/T03 | opus-4-6 | Mar 26, 2026, 04:37 AM | 2m 33s | $1.12 | 833.4k | 20 | ||||
| 10 | complete-slice | M001/S02 | opus-4-6 | Mar 26, 2026, 04:39 AM | 2m 8s | $0.572 | 626.3k | 17 | ||||
| 11 | execute-task | M001/S03/T01 | opus-4-6 | Mar 26, 2026, 04:42 AM | 3m 51s | $1.44 | 1.64M | 31 | ||||
| 12 | execute-task | M001/S03/T02 | opus-4-6 | Mar 26, 2026, 04:45 AM | 3m 45s | $1.52 | 2.14M | 35 | ||||
| 13 | complete-slice | M001/S03 | opus-4-6 | Mar 26, 2026, 04:49 AM | 2m 25s | $0.682 | 870.9k | 20 | ||||
| 14 | validate-milestone | M001 | opus-4-6 | Mar 26, 2026, 04:52 AM | 2m 30s | $1.29 | 1.96M | 16 | ||||
| 15 | complete-milestone | M001 | opus-4-6 | Mar 26, 2026, 04:54 AM | 2m 33s | $0.946 | 1.33M | 22 | ||||
| 16 | research-slice | M002/S01 | opus-4-6 | Mar 26, 2026, 04:57 AM | 2m 26s | $0.812 | 1.02M | 28 | ||||
| 17 | plan-slice | M002/S01 | opus-4-6 | Mar 26, 2026, 04:59 AM | 2m 35s | $0.760 | 842.6k | 17 | ||||
| 18 | execute-task | M002/S01/T01 | opus-4-6 | Mar 26, 2026, 05:02 AM | 3m 12s | $1.34 | 1.98M | 37 | ||||
| 19 | execute-task | M002/S01/T02 | opus-4-6 | Mar 26, 2026, 05:05 AM | 2m 5s | $0.787 | 931.1k | 23 | ||||
| 20 | execute-task | M002/S01/T03 | opus-4-6 | Mar 26, 2026, 05:07 AM | 8m 6s | $2.90 | 3.97M | 56 | ||||
| 21 | execute-task | M002/S01/T04 | opus-4-6 | Mar 26, 2026, 05:15 AM | 2m 4s | $0.973 | 1.33M | 25 | ||||
| 22 | complete-slice | M002/S01 | opus-4-6 | Mar 26, 2026, 05:17 AM | 2m 32s | $0.850 | 1.12M | 15 | ||||
| 23 | research-slice | M002/S02 | opus-4-6 | Mar 26, 2026, 05:20 AM | 3m 31s | $1.29 | 1.71M | 38 | ||||
| 24 | plan-slice | M002/S02 | opus-4-6 | Mar 26, 2026, 05:23 AM | 2m 52s | $0.861 | 959.7k | 20 | ||||
| 25 | execute-task | M002/S02/T01 | opus-4-6 | Mar 26, 2026, 05:26 AM | 5m 17s | $2.03 | 2.61M | 40 | ||||
| 26 | execute-task | M002/S02/T02 | opus-4-6 | Mar 26, 2026, 05:32 AM | 4m 9s | $1.76 | 2.24M | 38 | ||||
| 27 | execute-task | M002/S02/T03 | opus-4-6 | Mar 26, 2026, 05:36 AM | 3m 51s | $1.49 | 1.61M | 25 | ||||
| 28 | execute-task | M002/S02/T04 | opus-4-6 | Mar 26, 2026, 05:40 AM | 1m 25s | $0.819 | 1.11M | 17 | ||||
| 29 | complete-slice | M002/S02 | opus-4-6 | Mar 26, 2026, 05:41 AM | 2m 19s | $0.535 | 483.4k | 11 | ||||
| 30 | research-slice | M002/S03 | opus-4-6 | Mar 26, 2026, 05:44 AM | 2m 44s | $1.16 | 1.46M | 37 | ||||
| 31 | plan-slice | M002/S03 | opus-4-6 | Mar 26, 2026, 05:46 AM | 2m 10s | $0.714 | 677.4k | 18 | ||||
| 32 | execute-task | M002/S03/T01 | opus-4-6 | Mar 26, 2026, 05:48 AM | 4m 6s | $1.50 | 2.05M | 29 | ||||
| 33 | execute-task | M002/S03/T02 | opus-4-6 | Mar 26, 2026, 05:53 AM | 2m 40s | $1.36 | 1.86M | 30 | ||||
| 34 | execute-task | M002/S03/T03 | opus-4-6 | Mar 26, 2026, 05:55 AM | 2m 20s | $1.28 | 1.67M | 23 | ||||
| 35 | complete-slice | M002/S03 | opus-4-6 | Mar 26, 2026, 05:58 AM | 2m 39s | $0.994 | 1.28M | 16 | ||||
| 36 | validate-milestone | M002 | opus-4-6 | Mar 26, 2026, 06:00 AM | 2m 34s | $0.913 | 1.08M | 28 | ||||
| 37 | complete-milestone | M002 | opus-4-6 | Mar 26, 2026, 06:03 AM | 3m 54s | $1.57 | 2.34M | 31 |
Dependencies
M001: Kerf Engine — Raster-to-Vector Pipeline & API
done
active
pending
parked
M002: M002: React Frontend — Import & Convert UI + Design Canvas
done
active
pending
parked
M003: M003
done
active
pending
parked
Metrics
$41.85Total cost
51.67MTotal tokens
1.7kInput
321.5kOutput
49.94MCache read
1.41MCache write
2h 0mDuration
37Units
986Tool calls
0Truncations
Token breakdown
Input: 1.7k (0.0%)Output: 321.5k (0.6%)Cache read: 49.94M (96.6%)Cache write: 1.41M (2.7%)
Cost over time
Cost by phase
Tokens by phase
Cost by slice
Cost by model
Duration by slice
Slice timeline
Health
| Token profile | standard |
| Truncation rate | 0.0% per unit (0 total) |
| Continue-here rate | 0.0% per unit (0 total) |
| Tool calls | 986 |
| Messages | 608 assistant / 3 user |
Tier breakdown
| Tier | Units | Cost | Tokens |
|---|---|---|---|
| unknown | 37 | $41.85 | 51.67M |
Changelog 6
M002/S03
Text System + Font Loading
Mar 26, 2026, 06:00 AM
Added text objects to the design canvas with fontService (opentype.js-powered font loading, caching, text-to-path conversion), text tool in toolbar, text-specific property controls, and Convert to Paths action — 24 fontService tests + all 95 app tests pass
Decisions
- Preset default is 'sign' — covers the most common use case
- Presets use flat JSON with three sections (preprocessing, vectorization, postprocessing)
- resolve_params merges preset → user_params with user taking precedence
- Custom preset has empty param sections so pipeline defaults apply unless user provides overrides
- Multi-stage Docker build separates build deps from runtime (smaller image, no compiler tools)
- Engine image contains only engine source — enforces Engine/App separation (D001)
- Health endpoint at /engine/health for namespace consistency with other /engine/* routes
14 files modified
app/src/utils/fontService.ts— New — font loading, caching, text-to-path conversion service using opentype.jsapp/src/utils/__tests__/fontService.test.ts— New — 24 unit tests for fontService (registry, loading, caching, path conversion)app/public/fonts/Roboto-Regular.ttf— New — bundled OFL-licensed Roboto variable fontapp/public/fonts/OpenSans-Regular.ttf— New — bundled OFL-licensed Open Sans variable fontapp/public/fonts/Lato-Regular.ttf— New — bundled OFL-licensed Lato fontapp/src/App.css— Modified — added @font-face declarations for Roboto, Open Sans, Latoapp/package.json— Modified — added opentype.js v1.3.4 dependencyapp/src/types/canvas.ts— Modified — added TextObject interface and extended CanvasObject union with 'text' typeapp/src/components/canvas/KonvaStage.tsx— Modified — text rendering, text tool creation, text sizing/transform, 'text' in CanvasTool unionapp/src/components/canvas/CanvasToolbar.tsx— Modified — added text tool to TOOLS arrayapp/src/components/canvas/ObjectPanel.tsx— Modified — added 'T' icon for text objects in TYPE_ICONSapp/src/components/canvas/ShapeProperties.tsx— Modified — text property controls (content, font family, size, letter spacing, line height), Convert to Paths button, getWidth/getHeight casesapp/src/components/canvas/AlignmentBar.tsx— Modified — added text case to toBoundingRect for exhaustive switchapp/src/views/DesignCanvas.tsx— Modified — added onConvertToPath handler wiring ShapeProperties to canvas state
M002/S02
Design Canvas Core (View 2)
Mar 26, 2026, 05:44 AM
Built the Konva.js-powered 2D design canvas with artboard setup, shape tools, selection/transform, layer management, alignment, properties editing, keyboard shortcuts, and undo/redo — 48 new tests (71 total), zero TypeScript errors.
Decisions
- DXF output as raw bytes with application/dxf content-type and metadata in X-Kerf-Metadata header
- postprocess_svg() replaces regex metadata extraction — full XML path parsing for structured PathInfo objects
- _format_response() shared helper for consistent response shaping across endpoints
- Islands placed on separate ISLANDS layer in DXF for downstream CAM tool compatibility
- Bezier curves linearized during post-processing for RDP simplification and DXF polyline generation
19 files modified
app/src/types/canvas.ts— New — discriminated union type system for canvas objects (rect, circle, ellipse, line, image), ArtboardConfig, CanvasState, and CanvasAction typesapp/src/hooks/useCanvasState.ts— New — central state management hook with useReducer+useRef for CRUD, selection, undo/redo, reorder, visibility/lockapp/src/hooks/__tests__/useCanvasState.test.ts— New — 20 tests covering all useCanvasState operations including undo/redo edge casesapp/src/utils/artboardShapes.ts— New — artboard shape presets, shield/pennant SVG path generators, toPx/fromPx unit conversion, artboardClipPathapp/src/utils/__tests__/artboardShapes.test.ts— New — 15 tests for artboard presets, path generation, unit conversion, clip pathsapp/src/utils/alignment.ts— New — 9 pure alignment/distribute/center functions for canvas objectsapp/src/utils/__tests__/alignment.test.ts— New — 13 tests for alignment, distribution, and center-on-artboardapp/src/components/canvas/ArtboardSetup.tsx— New — modal for artboard shape/size/unit selection on entering canvas viewapp/src/components/canvas/KonvaStage.tsx— New — Konva Stage+Layer rendering artboard, all object types, Transformer, rubber-band selectionapp/src/components/canvas/ObjectPanel.tsx— New — layer management panel with z-order list, reorder, visibility/lock toggles, renameapp/src/components/canvas/AlignmentBar.tsx— New — alignment and distribution toolbar consuming alignment utilsapp/src/components/canvas/CanvasToolbar.tsx— New — tool switcher, undo/redo, grid toggle, zoom controlsapp/src/components/canvas/ShapeProperties.tsx— New — property editor for selected shape (stroke, fill, dimensions, line style, opacity)app/src/views/DesignCanvas.tsx— New — View 2 container wiring KonvaStage + all panels to useCanvasState, SVG import, keyboard shortcutsapp/src/views/DesignCanvas.module.css— New — CSS module for DesignCanvas layoutapp/src/App.tsx— Modified — wired DesignCanvas with svgData/traceMetadata props, removed underscore prefixesapp/src/App.css— Modified — added comprehensive canvas UI styles (toolbar, panels, artboard setup, shape properties, alignment bar)app/src/test-setup.ts— Modified — added vitest-canvas-mock import for Konva testingapp/package.json— Modified — added konva, react-konva, vitest-canvas-mock dependencies
M002/S01
Import & Convert UI (View 1)
Mar 26, 2026, 05:20 AM
Built the complete Import & Convert view (View 1) — file upload, preset selection, debounced live vectorization preview with parameter sliders, output stats bar, and Use This button to advance to canvas.
18 files modified
engine/main.py— Added CORSMiddleware allowing all origins for devapp/vite.config.ts— Vite config with React plugin, dev proxy to engine, Vitest configapp/src/types/engine.ts— TypeScript interfaces for PresetConfig, TraceResponse, TraceMetadata, PresetsResponseapp/src/api/engine.ts— Typed API client: getPresets(), traceImage(), simplifyVector() with AbortSignalapp/src/api/__tests__/engine.test.ts— 9 unit tests for API client covering URL/method/FormData/AbortSignal/errorsapp/src/hooks/useDebouncedTrace.ts— Custom hook: debounced trace with AbortController, SVG mode detection, params stabilizationapp/src/hooks/__tests__/useDebouncedTrace.test.ts— 7 tests for debounce, abort, SVG routing, error handling, cleanupapp/src/views/ImportConvert.tsx— View 1 container: two-column layout wiring FileUpload, PresetSelector, ParameterSliders, SvgPreview, OutputInfoBar, Use This buttonapp/src/views/ImportConvert.module.css— CSS module for ImportConvert layoutapp/src/components/FileUpload.tsx— Drag-and-drop file upload with thumbnail preview and SVG detectionapp/src/components/PresetSelector.tsx— Fetches presets from engine, renders cards with selection state, auto-selects signapp/src/components/ParameterSliders.tsx— Mode-aware range sliders for vectorization parametersapp/src/components/SvgPreview.tsx— Responsive SVG rendering with loading/error statesapp/src/components/OutputInfoBar.tsx— Color-coded stats bar with warnings displayapp/src/components/__tests__/OutputInfoBar.test.tsx— 7 tests for color coding logic and edge casesapp/src/App.tsx— ViewState routing, SVG/metadata state for View 2 handoffapp/src/App.css— Global styles for shared componentsapp/src/test-setup.ts— Vitest setup with jest-dom matchers
M001/S03
Preset System + Engine Docker Packaging
Mar 26, 2026, 04:52 AM
Shipped 5 pipeline presets (sign, patch, stencil, detailed, custom) with merge-based param resolution, GET /engine/presets endpoint, and a multi-stage Docker image with healthcheck that runs the engine standalone.
Decisions
- Preset default is 'sign' — covers the most common use case
- Presets use flat JSON with three sections (preprocessing, vectorization, postprocessing)
- resolve_params merges preset → user_params with user taking precedence
- Custom preset has empty param sections so pipeline defaults apply unless user provides overrides
- Multi-stage Docker build separates build deps from runtime (smaller image, no compiler tools)
- Engine image contains only engine source — enforces Engine/App separation (D001)
- Health endpoint at /engine/health for namespace consistency with other /engine/* routes
10 files modified
engine/presets/sign.json— Sign preset — aggressive simplification for signage vectorizationengine/presets/patch.json— Patch preset — smooth curves with auto-close for embroideryengine/presets/stencil.json— Stencil preset — heavy simplification with fixed thresholdengine/presets/detailed.json— Detailed preset — max fidelity for illustrationsengine/presets/custom.json— Custom preset — empty defaults, user controls everythingengine/presets/loader.py— Preset loader with caching, listing, and param merge resolutionengine/api/routes.py— Added GET /engine/presets, GET /engine/health, wired preset into /engine/traceengine/tests/test_presets.py— 28 tests covering loader, resolution, endpoint, integration, cross-preset differentiationdocker/Dockerfile.engine— Multi-stage Dockerfile: builder compiles pypotrace, runtime uses slim image with engine source only.dockerignore— Excludes .git, .venv, __pycache__, .gsd, node_modules from Docker build context
M001/S02
Post-Processing + Output Formats (SVG, DXF, JSON)
Mar 26, 2026, 04:41 AM
Full post-processing pipeline (RDP simplification, island detection, open path repair) with three output format generators (SVG, DXF, JSON) and /engine/simplify endpoint — 169 tests passing.
Decisions
- DXF output as raw bytes with application/dxf content-type and metadata in X-Kerf-Metadata header
- postprocess_svg() replaces regex metadata extraction — full XML path parsing for structured PathInfo objects
- _format_response() shared helper for consistent response shaping across endpoints
- Islands placed on separate ISLANDS layer in DXF for downstream CAM tool compatibility
- Bezier curves linearized during post-processing for RDP simplification and DXF polyline generation
9 files modified
engine/pipeline/postprocess.py— New: Post-processing module with RDP simplification, island detection, open path repair, SVG path parsing (414 lines)engine/output/__init__.py— New: Package init exporting generate_dxf, generate_json, generate_svgengine/output/dxf.py— New: AC1015 DXF generator using ezdxf — LWPOLYLINE entities with island layer separation (66 lines)engine/output/json_output.py— New: JSON output generator with path commands and properties (76 lines)engine/output/svg.py— New: SVG output generator returning simplified SVG from PostProcessResult (22 lines)engine/api/routes.py— Rewritten: integrated postprocess_svg(), output_format routing, /engine/simplify endpoint, _format_response() helper (175 lines)engine/tests/test_postprocess.py— New: Tests for RDP, island detection, open paths, SVG parsing, node counting (375 lines)engine/tests/test_output.py— New: Tests for DXF structure, JSON structure, SVG output, round-trip consistency (274 lines)engine/tests/test_api.py— Rewritten: 35 integration tests for /engine/trace and /engine/simplify across all format combinations (515 lines)
M001/S01
Core Pipeline — Preprocessing + Vectorization
Mar 26, 2026, 04:30 AM
Knowledge 25
Rules 1
| ID | Scope | Rule |
|---|---|---|
| # | Scope | Rule |
Patterns 13
| ID | Pattern |
|---|---|
| # | Pattern |
| P001 | Test images generated programmatically via numpy |
| P002 | Tests must use .venv/bin/python -m pytest |
| P003 | PostProcessResult is the universal intermediate representation |
| P004 | _format_response() for consistent multi-format API responses |
| P005 | Preset-driven pipeline: resolve_params() merges preset → user |
| P006 | JSON.stringify for React hook dependency stabilization |
| P007 | Vite dev proxy for engine API calls |
| P008 | CSS modules for views, global App.css for shared component styles |
| P009 | opentype.js needs dynamic import() and local type declarations |
| P010 | Font Y-axis flip: canvas_y = ascender - font_y * scale |
| P011 | Letter spacing requires manual per-character glyph positioning |
| P012 | Adding new CanvasObject types requires exhaustive switch updates in 6 files |
Lessons 11
| ID | Lesson |
|---|---|
| # | What Happened |
| L001 | pypotrace fails to build from pip |
| L002 | VTracer Python bindings work directly — no subprocess needed |
| L003 | pypotrace Bitmap requires uint32 data |
| L004 | ezdxf emits pyparsing deprecation warnings in tests |
| L005 | DXF output format needs binary response, not JSON envelope |
| L006 | postprocess_svg() fully parses SVG paths into coordinates |
| L007 | Docker build context must be project root, not engine/ |
| L008 | Engine container has dual health endpoints |
| L009 | useCallback-based triggerTrace caused infinite re-render loops |
| L010 | jest-canvas-mock crashes in Vitest with "ReferenceError: jest is not defined" |
Captures
No captures recorded.
Artifacts
Missing changelogs 3
| Milestone | Slice | Title |
|---|---|---|
| M003 | S01 | Export Flow (View 3) + DXF Generation |
| M003 | S02 | Docker Packaging + README |
| M003 | S03 | Embed Mode |
Recently completed 6
| Milestone | Slice | Title | Completed |
|---|---|---|---|
| M002 | S03 | Text System + Font Loading | Mar 26, 2026, 06:00 AM |
| M002 | S02 | Design Canvas Core (View 2) | Mar 26, 2026, 05:44 AM |
| M002 | S01 | Import & Convert UI (View 1) | Mar 26, 2026, 05:20 AM |
| M001 | S03 | Preset System + Engine Docker Packaging | Mar 26, 2026, 04:52 AM |
| M001 | S02 | Post-Processing + Output Formats (SVG, DXF, JSON) | Mar 26, 2026, 04:41 AM |
Planning
| ID | Milestone | State | Context | Draft | Updated |
|---|---|---|---|---|---|
| M001 | Kerf Engine — Raster-to-Vector Pipeline & API | undiscussed | |||
| M002 | M002: React Frontend — Import & Convert UI + Design Canvas | undiscussed | |||
| M003 | M003 | undiscussed |