# M1730-Scale

SVG scale artwork and web generator for M1730 analog panel meters. Scales are typeset in **ГОСТ тип А** (GOST type A), the Russian technical drafting standard typeface.

## Repository layout

```
M1730-Scale_template.svg   Inkscape working file (background, tick marks, labels)
M1730-Scale_paths.svg      Paths-only export — text converted to outlines
M1730-Scale_text.svg       Live-text export — embedded font, editable labels
fonts/                     ГОСТ тип А TTF (required for Docker build)
web/                       Flask web generator
k8s/                       Kubernetes manifests
Dockerfile                 Container build
```

## SVG files

All canvases are **157.18 × 26.68 mm**. The coordinate origin is offset: layer 1 carries `transform="translate(-37.352226,-90.454928)"`, so absolute SVG coordinates begin around x=37, y=90.

| File | Purpose |
|---|---|
| `M1730-Scale_template.svg` | Master Inkscape file. Contains background path, tick marks, unit label, numeric labels, and range label. Edit this one. |
| `M1730-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. |
| `M1730-Scale_text.svg` | Live `<text>` nodes with the font embedded as base64. Smaller file; requires an SVG viewer that supports embedded fonts. |

Open files in **Inkscape** (developed with v1.4.3). There is no build step — edit the SVG directly or use the web generator.

## Web generator

A Flask app that generates scale SVGs from a form. Supports two output modes switchable in the UI:

- **Paths** — glyphs rendered as outlines via fontTools; opens cleanly in Inkscape, Illustrator, and cutting software
- **Text** — live `<text>` elements with the GOST font embedded as base64

### Run locally

```bash
source .venv/bin/activate
cd web && python app.py      # http://localhost:5000
```

Fonts are loaded at startup from the `fonts/` directory in the repo root.

### Form parameters

| Field | Description |
|---|---|
| Unit | Symbol shown in the left panel (e.g. `U`, `mA`, `%`). Supports inline markup — see below |
| Range label | Text inside the coloured bar on the right (e.g. `5mA`) |
| Mapping | **Linear**, **√** (square root), or **Log**. Major ticks are always evenly spaced physically; the mapping controls their values and how minor ticks are placed within each interval. See below. |
| Min / Max | Numeric range of the scale |
| Major intervals | Number of major tick intervals |
| Minor per interval | Minor ticks between each pair of major ticks |
| Labels | Number of numeric labels; Labels − 1 should divide evenly into Major intervals |
| Custom labels | Optional comma-separated labels that override the calculated numbers; their count sets the number of labels. Leave blank to auto-calculate |
| Label size (mm) | Font size of the numeric labels, in millimetres (default `9`) |

Calculated numbers are rendered in fixed-point notation at 4 significant figures — never scientific (e.g. `10000`, not `1e+04`).

### Scale mappings

| Mapping | Major tick values | Minor tick placement | Constraints |
|---|---|---|---|
| Linear | Evenly spaced | Uniform | None |
| √ | Quadratic (0, 1, 4, 9 … × max) — compresses low values | Crowded toward the low end of each interval | Min ≥ 0 |
| Log | Geometric (min × r⁰, r¹, r² …) — each interval spans the same ratio | Crowded toward the high end of each interval | Min and Max > 0 |
| 1/x | Harmonic (values decrease left → right, e.g. ∞, 10, 5, 2, 1) — compresses high values | Uniform (in position space, i.e. proportional to 1/v) | Min and Max > 0; Max may be ∞ |

The √ mapping is typical for AC RMS current and power meters, where needle deflection is proportional to the square of the measured quantity. The 1/x mapping is used for ohms/resistance scales, where values decrease from left (high resistance / ∞) to right (low resistance).

### Unit markup

The Unit field accepts a lightweight shorthand (no LaTeX engine — everything is drawn as glyph paths in the ГОСТ тип А font and auto-sized to fit the panel):

| Markup | Result |
|---|---|
| `cm^2` | superscript (`^{...}` for multiple characters) |
| `H_2O` | subscript (`_{...}` for multiple characters) |
| `{1/2}` | stacked fraction with a horizontal rule; a bare `/` stays inline |

Constructs nest: `{m/s^2}` is a fraction with a superscript in the denominator, `x^{1/2}` a superscripted fraction. A unit containing markup is always emitted as paths, even in text-output mode, since it is a composite of glyphs and a rule.

## Container

```bash
docker build -t m1730-scale:latest .
docker run -p 5000:5000 m1730-scale:latest
```

Fonts are loaded from `fonts/` in the repo root; they are bundled into the image at build time.

The production image is at `git.baumann.gr/adebaumann/m1730-generator`.

## Kubernetes

Manifests in `k8s/` deploy to the `works` namespace with a Traefik v2 IngressRoute at `works.baumann.gr/M1730-generator`.

```bash
# Managed by ArgoCD — push to git to deploy
git push
```

Resources: namespace, deployment (1 replica, gunicorn), ClusterIP service, Traefik IngressRoute + stripPrefix middleware.

## License

GPL-3.0 — see [LICENSE](LICENSE).
