Add web SVG generator, container, and Kubernetes manifests
- Flask app (web/) generates M1730 scale SVGs from a form; embeds GOST typ A font as base64 so output is self-contained - Dockerfile builds the app into git.baumann.gr/adebaumann/m1730-generator - k8s/ deploys as a ClusterIP service for NPM to proxy at works.adebaumann.com/M1730-generator/ Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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import base64
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import pathlib
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from flask import Flask, render_template, request, Response
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from html import escape
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app = Flask(__name__)
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_FONT_PATH = pathlib.Path('/usr/local/share/fonts/г/ГОСТ_тип_А.ttf')
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_FONT_B64 = base64.b64encode(_FONT_PATH.read_bytes()).decode()
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_FONT_FACE = (
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'<defs><style>'
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'@font-face {'
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'font-family:"ГОСТ тип А";'
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f'src:url("data:font/truetype;base64,{_FONT_B64}") format("truetype");'
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'}'
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'</style></defs>'
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)
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# SVG absolute coordinate constants (1 user unit = 1 mm)
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ZERO_X = 60.844130 # x of the zero/left tick
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MAX_X = 180.251230 # x of the full-scale/right tick
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BAR_Y = 107.54670 # y at the top of the scale bar (tick baseline)
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SCALE_LEN = MAX_X - ZERO_X # 119.4071 mm
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BIG_H = 5.0895 # major tick height
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SMALL_H = 2.6683 # minor tick height
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def _fmt(v: float) -> str:
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if v == int(v):
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return str(int(v))
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return f"{v:.4g}"
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def generate_svg(unit, min_val, max_val, range_label, big_ticks, small_ticks, label_count):
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big_interval = SCALE_LEN / big_ticks
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big_xs = [ZERO_X + i * big_interval for i in range(big_ticks + 1)]
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label_count = max(2, min(label_count, big_ticks + 1))
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label_indices = [round(k * big_ticks / (label_count - 1)) for k in range(label_count)]
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parts = [
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'<?xml version="1.0" encoding="UTF-8" standalone="no"?>',
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'<svg width="157.18373mm" height="26.683672mm"'
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' viewBox="0 0 157.18373 26.683672" version="1.1"'
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' xmlns="http://www.w3.org/2000/svg">',
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_FONT_FACE,
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' <g transform="translate(-37.352226,-90.454928)">',
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# Background rect with scale-bar cutout
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' <path style="fill:#f9f9f9;stroke:#1a1a1a;stroke-width:0.184;'
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'stroke-linecap:round;stroke-miterlimit:10"'
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' d="M 37.444226,90.546928 V 117.0466 H 194.44395 V 90.546928 Z'
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' M 58.443978,107.54692 H 183.64409 v 6.19963 H 58.443978 Z" />',
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# Unit label (large letter in left panel)
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f' <text style="font-size:18.7981px;font-family:\'ГОСТ тип А\',monospace;fill:#1a1a1a"'
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f' x="41.455711" y="109.03796"'
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f' transform="scale(0.96486402,1.0364155)">{escape(unit)}</text>',
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# Range label inside the strip on the right
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f' <text style="font-size:3.60539px;font-family:\'ГОСТ тип А\',monospace;fill:#1a1a1a"'
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f' x="184.79707" y="113.6755">{escape(range_label)}</text>',
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]
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# Major ticks
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for x in big_xs:
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parts.append(
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f' <line x1="{x:.5f}" y1="{BAR_Y}" x2="{x:.5f}" y2="{BAR_Y - BIG_H:.5f}"'
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f' style="stroke:#1a1a1a;stroke-width:0.555;stroke-linecap:butt" />'
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)
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# Minor ticks
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if small_ticks > 0:
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sub = small_ticks + 1
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for i in range(big_ticks):
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for j in range(1, small_ticks + 1):
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x = big_xs[i] + j * big_interval / sub
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parts.append(
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f' <line x1="{x:.5f}" y1="{BAR_Y}" x2="{x:.5f}" y2="{BAR_Y - SMALL_H:.5f}"'
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f' style="stroke:#1a1a1a;stroke-width:0.302;stroke-linecap:butt" />'
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)
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# Numeric labels (centered on their tick, above the tick area)
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for idx in label_indices:
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x = big_xs[idx]
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val = min_val + (max_val - min_val) * idx / big_ticks
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parts.append(
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f' <text style="font-size:8.89194px;font-family:\'ГОСТ тип А\',monospace;fill:#1a1a1a"'
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f' text-anchor="middle" x="{x:.5f}" y="101.49598">{escape(_fmt(val))}</text>'
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)
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parts += [' </g>', '</svg>']
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return '\n'.join(parts)
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@app.route('/')
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def index():
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return render_template('index.html')
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@app.route('/generate', methods=['POST'])
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def generate():
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unit = request.form.get('unit', '%')
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min_val = float(request.form.get('min', 0))
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max_val = float(request.form.get('max', 100))
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range_label = request.form.get('range_label', '5mA')
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big_ticks = max(1, min(50, int(request.form.get('big_ticks', 10))))
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small_ticks = max(0, min(20, int(request.form.get('small_ticks', 4))))
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label_count = max(2, int(request.form.get('label_count', 6)))
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svg = generate_svg(unit, min_val, max_val, range_label, big_ticks, small_ticks, label_count)
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return Response(svg, mimetype='image/svg+xml')
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if __name__ == '__main__':
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app.run(debug=True)
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@@ -0,0 +1,2 @@
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flask
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gunicorn
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>M1730 Scale Generator</title>
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<style>
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*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
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body {
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font-family: system-ui, sans-serif;
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background: #f4f4f5;
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color: #222;
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min-height: 100vh;
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padding: 2rem 1.5rem;
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}
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.container { max-width: 840px; margin: 0 auto; }
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h1 { font-size: 1.3rem; font-weight: 600; margin-bottom: 1.5rem; }
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.card {
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background: #fff;
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border: 1px solid #ddd;
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border-radius: 8px;
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padding: 1.5rem;
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margin-bottom: 1.5rem;
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}
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.grid {
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display: grid;
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grid-template-columns: 1fr 1fr;
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gap: 1rem 2rem;
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}
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@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }
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label {
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display: flex;
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flex-direction: column;
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gap: 0.3rem;
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font-size: 0.88rem;
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font-weight: 600;
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}
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label small { font-weight: normal; color: #666; font-size: 0.8rem; }
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input[type="text"],
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input[type="number"] {
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padding: 0.4rem 0.65rem;
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border: 1px solid #bbb;
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border-radius: 4px;
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font-size: 0.95rem;
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width: 100%;
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transition: border-color 0.15s;
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}
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input:focus { outline: 2px solid #0070f3; outline-offset: 1px; border-color: transparent; }
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.actions {
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grid-column: 1 / -1;
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display: flex;
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gap: 0.75rem;
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align-items: center;
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margin-top: 0.5rem;
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}
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button {
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padding: 0.45rem 1.2rem;
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font-size: 0.9rem;
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border: none;
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border-radius: 4px;
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cursor: pointer;
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font-weight: 500;
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}
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#btn-generate { background: #0070f3; color: #fff; }
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#btn-generate:hover { background: #005fd4; }
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#btn-download { background: #e5e5e5; color: #222; }
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#btn-download:hover:not(:disabled) { background: #d4d4d4; }
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#btn-download:disabled { opacity: 0.45; cursor: not-allowed; }
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#status { font-size: 0.82rem; color: #888; }
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.preview-card {
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background: #fff;
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border: 1px solid #ddd;
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border-radius: 8px;
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padding: 1.5rem;
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}
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.preview-label {
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font-size: 0.8rem;
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font-weight: 600;
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color: #888;
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text-transform: uppercase;
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letter-spacing: 0.05em;
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margin-bottom: 1rem;
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}
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#preview svg { width: 100%; height: auto; display: block; }
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#preview-placeholder { font-size: 0.9rem; color: #aaa; }
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</style>
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</head>
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<body>
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<div class="container">
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<h1>M1730 Scale Generator</h1>
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<div class="card">
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<form id="form" class="grid">
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<label>
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Unit
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<small>Large letter left of scale</small>
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<input name="unit" type="text" value="%" required>
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</label>
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<label>
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Range label
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<small>Small text in the strip (e.g. 5mA, 10V)</small>
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<input name="range_label" type="text" value="5mA" required>
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</label>
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<label>
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Min value
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<small>Value at the left (zero) end</small>
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<input name="min" type="number" step="any" value="0" required>
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</label>
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<label>
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Max value
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<small>Value at the right end</small>
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<input name="max" type="number" step="any" value="100" required>
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</label>
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<label>
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Major tick intervals
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<small>Number of divisions (e.g. 10 → 0, 10, 20 … 100)</small>
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<input name="big_ticks" type="number" min="1" max="50" value="10" required>
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</label>
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<label>
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Minor ticks per interval
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<small>Small ticks between each major pair</small>
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<input name="small_ticks" type="number" min="0" max="20" value="4" required>
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</label>
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<label>
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Number of labels
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<small>Numeric values to print; best when (count−1) divides intervals</small>
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<input name="label_count" type="number" min="2" value="6" required>
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</label>
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<div class="actions">
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<button type="submit" id="btn-generate">Generate</button>
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<button type="button" id="btn-download" disabled>Download SVG</button>
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<span id="status"></span>
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</div>
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</form>
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</div>
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<div class="preview-card">
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<div class="preview-label">Preview</div>
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<div id="preview">
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<p id="preview-placeholder">Fill in the form and click Generate.</p>
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</div>
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</div>
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</div>
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<script>
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let lastSvg = '';
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async function doGenerate() {
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const status = document.getElementById('status');
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status.textContent = 'Generating…';
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try {
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const resp = await fetch('generate', {
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method: 'POST',
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body: new FormData(document.getElementById('form')),
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});
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if (!resp.ok) throw new Error(await resp.text());
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lastSvg = await resp.text();
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document.getElementById('preview').innerHTML = lastSvg;
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document.getElementById('btn-download').disabled = false;
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status.textContent = '';
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} catch (err) {
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status.textContent = 'Error: ' + err.message;
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}
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}
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document.getElementById('form').addEventListener('submit', e => {
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e.preventDefault();
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doGenerate();
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});
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document.getElementById('btn-download').addEventListener('click', () => {
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if (!lastSvg) return;
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const a = Object.assign(document.createElement('a'), {
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href: URL.createObjectURL(new Blob([lastSvg], { type: 'image/svg+xml' })),
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download: 'M1730-Scale.svg',
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});
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a.click();
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URL.revokeObjectURL(a.href);
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});
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// Show default scale on load
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doGenerate();
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</script>
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</body>
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</html>
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