M1730-Scale
M1730-Scale
This code is deprecated. It’s functionality has been integrated in Scale Generator
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
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) |
| Midpoint tick labels | Optional labels at the medium-length mid ticks (only shown when Minor per interval is odd) |
| Tick length & thickness | Configurable Major / Middle / Minor tick length and thickness |
| Font | Per-element font selection (Default, Number labels, Main unit, Range label) |
| Colour bar | Optional coloured segments drawn in the strip below the ticks, positioned by value and mapping |
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 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 |
[AC], [DC], [ACDC] | dotted instrument symbols (sine / dashed-line) |
Constructs nest: {m/s^2} is a fraction with a superscript in the denominator, x^{1/2} a superscripted fraction. Custom numeric labels and the range label accept the same markup. A label containing markup is always emitted as paths, even in text-output mode, since it is a composite of glyphs and a rule.
Glyphs missing from the selected font (e.g. Ω) are drawn automatically from a fallback font (FreeSans, FreeSerif, FreeMono), so special characters always render.
Container
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.
# 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.