122 lines
4.9 KiB
Markdown
122 lines
4.9 KiB
Markdown
# E440-Scale
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SVG scale artwork and web generator for E440-style round-dial analog panel
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meters. Scales are typeset in **Alte DIN 1451 Mittelschrift**.
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## Repository layout
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```
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E440-Scale_template.svg Inkscape working file (case body, tick marks, labels)
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E440-Scale_paths.svg Paths-only export — text converted to outlines
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E440-Scale_text.svg Live-text export — embedded font, editable labels
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fonts/ TTF fonts (required for Docker build)
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web/ Flask web generator
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k8s/ Kubernetes manifests
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Dockerfile Container build
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```
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## SVG files
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The canvas is **93.824249 × 57.215687 mm**. The coordinate origin is
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offset: layer 1 carries `transform="translate(-60.717741,-107.14126)"`, so
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absolute SVG coordinates begin around x=61, y=107.
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The dial's case geometry — body outline, mounting ears, pivot point
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(local `107.42845, 162.62819`), rim radius (`43.842751` mm), and angular
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sweep (`±45.667°` from vertical) — is fixed across every generated scale.
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Only the tick marks, numeric labels, unit label, and corner text vary.
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| File | Purpose |
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|---|---|
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| `E440-Scale_template.svg` | Master Inkscape file. Edit this one. |
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| `E440-Scale_paths.svg` | All text converted to outlines. Use for cutting plotters, laser engravers, or any workflow where fonts must not be embedded as live text. |
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| `E440-Scale_text.svg` | Live `<text>` nodes with the font embedded as base64. Smaller file; requires an SVG viewer that supports embedded fonts. |
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Open files in **Inkscape** (developed with v1.4.3). There is no build step
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— edit the SVG directly or use the web generator.
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## Web generator
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A Flask app that generates arc-dial scale SVGs from a form. Supports two
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output modes switchable in the UI:
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- **Paths** — glyphs rendered as outlines via fontTools; opens cleanly in
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Inkscape, Illustrator, and cutting software
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- **Text** — live `<text>` elements with the selected font embedded as
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base64
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### Run locally
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```bash
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source .venv/bin/activate
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cd web && python app.py # http://localhost:5000
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```
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Fonts are loaded at startup from the `fonts/` directory in the repo root.
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### Form parameters
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| Field | Description |
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|---|---|
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| Unit | Symbol shown centered above the arc (e.g. `uA`, `V`, `%`). Supports inline markup — see below |
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| Left label / Right label | Up to 2 lines each, placed in the bottom-left/bottom-right corners of the dial |
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| Mapping | **Linear**, **√** (square root), **Log**, or **1/x** (reciprocal). Major ticks are always evenly spaced angularly; the mapping controls their values and how minor ticks are placed within each interval. |
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| Min / Max | Numeric range of the scale |
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| Major intervals | Number of major tick intervals |
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| Minor per interval | Minor ticks between each pair of major ticks. When odd, the exact midpoint subdivision is drawn as a taller "medium" tick, matching the reference dial's 3-tier tick scheme |
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| Labels | Number of numeric labels; Labels − 1 should divide evenly into Major intervals |
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| Custom labels | Optional comma-separated labels that override the calculated numbers |
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| Label size (mm) | Font size of the numeric labels, in millimetres (default `5.1126`) |
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### Scale mappings
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| Mapping | Major tick values | Minor tick placement | Constraints |
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|---|---|---|---|
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| Linear | Evenly spaced | Uniform | None |
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| √ | Quadratic (0, 1, 4, 9 … × max) — compresses low values | Crowded toward the low end of each interval | Min ≥ 0 |
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| Log | Geometric (min × r⁰, r¹, r² …) — each interval spans the same ratio | Crowded toward the high end of each interval | Min and Max > 0 |
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| 1/x | Harmonic (values decrease left → right, e.g. ∞, 10, 5, 2, 1) — compresses high values | Uniform (in angle space, i.e. proportional to 1/v) | Min and Max > 0; Max may be ∞ |
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### Unit markup
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The Unit field accepts a lightweight shorthand (no LaTeX engine — everything
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is drawn as glyph paths and auto-sized to fit above the arc):
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| Markup | Result |
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|---|---|
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| `cm^2` | superscript (`^{...}` for multiple characters) |
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| `H_2O` | subscript (`_{...}` for multiple characters) |
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| `{1/2}` | stacked fraction with a horizontal rule; a bare `/` stays inline |
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Constructs nest: `{m/s^2}` is a fraction with a superscript in the
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denominator, `x^{1/2}` a superscripted fraction.
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## Container
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```bash
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docker build -t e440-scale:latest .
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docker run -p 5000:5000 e440-scale:latest
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```
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Fonts are loaded from `fonts/` in the repo root; they are bundled into the
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image at build time.
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The production image is at `git.baumann.gr/adebaumann/e440-generator`.
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## Kubernetes
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Manifests in `k8s/` deploy to the `works` namespace with a Traefik v2
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IngressRoute at `works.baumann.gr/E440-generator`.
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```bash
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# Managed by ArgoCD — push to git to deploy
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git push
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```
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Resources: namespace, deployment (1 replica, gunicorn), ClusterIP service,
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Traefik IngressRoute + stripPrefix middleware.
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## License
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GPL-3.0 — see [LICENSE](LICENSE).
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