E440-Scale_template.svg   Inkscape working file (case body, tick marks, labels)
E440-Scale_paths.svg      Paths-only export — text converted to outlines
E440-Scale_text.svg       Live-text export — embedded font, editable labels
fonts/                     TTF fonts (required for Docker build)
web/                       Flask web generator
k8s/                       Kubernetes manifests
Dockerfile                 Container build

SVG files

The canvas is 93.824249 × 57.215687 mm. The coordinate origin is offset: layer 1 carries transform="translate(-60.717741,-107.14126)", so absolute SVG coordinates begin around x=61, y=107.

The dial's case geometry — body outline, mounting ears, pivot point (local 107.42845, 162.62819), rim radius (43.842751 mm), and angular sweep (±45.667° from vertical) — is fixed across every generated scale. Only the tick marks, numeric labels, unit label, and corner text vary.

File	Purpose
`E440-Scale_template.svg`	Master Inkscape file. Edit this one.
`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.
`E440-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 arc-dial 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 selected 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 centered above the arc (e.g. `uA`, `V`, `%`). Supports inline markup — see below
Left label / Right label	Up to 2 lines each, placed in the bottom-left/bottom-right corners of the dial
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.
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. When odd, the exact midpoint subdivision is drawn as a taller "medium" tick, matching the reference dial's 3-tier tick scheme
Labels	Number of numeric labels; Labels − 1 should divide evenly into Major intervals
Custom labels	Optional comma-separated labels that override the calculated numbers
Label size (mm)	Font size of the numeric labels, in millimetres (default `5.1126`)

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 high 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 angle space, i.e. proportional to 1/v)	Min and Max > 0; Max may be ∞

Unit markup

The Unit field accepts a lightweight shorthand (no LaTeX engine — everything is drawn as glyph paths and auto-sized to fit above the arc):

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.

Container

docker build -t e440-scale:latest .
docker run -p 5000:5000 e440-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/e440-generator.

Kubernetes

Manifests in k8s/ deploy to the works namespace with a Traefik v2 IngressRoute at works.baumann.gr/E440-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.

README.md Unescape Escape

E440-Scale

Repository layout