adebaumann
54a7f072c4
- New "Label size (mm)" field controlling the numeric-label font size, defaulting to a clean 9 mm (was the inherited Inkscape value 8.89194) - Pin k8s deployment to image tag 0.76
241 lines
8.6 KiB
Python
241 lines
8.6 KiB
Python
import base64
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import math
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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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from fontTools.ttLib import TTFont
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from fontTools.pens.svgPathPen import SVGPathPen
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app = Flask(__name__)
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VERSION = "0.76"
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_LOGO_PATH = pathlib.Path(__file__).parent / 'static' / 'logo.png'
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_LOGO_B64 = base64.b64encode(_LOGO_PATH.read_bytes()).decode()
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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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_FONT_OBJ = TTFont(str(_FONT_PATH))
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_GLYPH_SET = _FONT_OBJ.getGlyphSet()
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_CMAP = _FONT_OBJ.getBestCmap()
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_HMTX = _FONT_OBJ['hmtx'].metrics
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_UPM = _FONT_OBJ['head'].unitsPerEm
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# SVG absolute coordinate constants (1 user unit = 1 mm)
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ZERO_X = 60.844130
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MAX_X = 180.251230
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BAR_Y = 107.54670
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SCALE_LEN = MAX_X - ZERO_X # 119.4071 mm
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BIG_H = 5.0895
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SMALL_H = 2.6683
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_UNIT_AREA_WIDTH = 18.445
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_UNIT_SCALE_X = 0.96486402
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_UNIT_CHAR_EM = 0.65
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def _unit_font_size(unit: str) -> float:
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n = max(1, len(unit))
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return min(18.7981, _UNIT_AREA_WIDTH / (n * _UNIT_SCALE_X * _UNIT_CHAR_EM))
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def _fmt(v: float) -> str:
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# Snap near-integers — log-scale geometric values accumulate FP error
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# (e.g. 9999.9999), which would otherwise miss the integer case.
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r = round(v)
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if abs(v - r) < 1e-9 * max(1.0, abs(v)):
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return str(int(r))
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# 4 significant figures in fixed-point notation (never scientific).
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exp = math.floor(math.log10(abs(v)))
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decimals = max(0, 4 - 1 - exp)
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s = f"{v:.{decimals}f}"
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return s.rstrip('0').rstrip('.') if '.' in s else s
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def _text_to_paths(text, x, y, font_size, anchor='start', fill='#1a1a1a', wrap_transform=None):
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s = font_size / _UPM
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if anchor == 'middle':
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total_w = sum(
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_HMTX.get(_CMAP.get(ord(ch)), (0, 0))[0] * s
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for ch in text if _CMAP.get(ord(ch))
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)
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x -= total_w / 2
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parts = []
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cx = x
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for ch in text:
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gn = _CMAP.get(ord(ch))
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if gn is None:
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continue
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pen = SVGPathPen(_GLYPH_SET)
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_GLYPH_SET[gn].draw(pen)
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d = pen.getCommands()
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if d:
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t = f'translate({cx:.5f},{y:.5f}) scale({s:.8f},{-s:.8f})'
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parts.append(f'<path style="fill:{fill}" transform="{t}" d="{d}"/>')
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cx += _HMTX.get(gn, (0, 0))[0] * s
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inner = '\n'.join(parts)
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if wrap_transform:
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return f'<g transform="{wrap_transform}">{inner}</g>'
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return inner
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def generate_svg(unit, min_val, max_val, range_label, big_ticks, small_ticks, label_count,
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use_paths=True, log_scale=False, custom_labels=None, label_size=9):
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if log_scale:
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if min_val <= 0 or max_val <= 0:
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raise ValueError("Logarithmic scale requires min and max values greater than 0.")
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lmin, lmax = math.log(min_val), math.log(max_val)
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lspan = lmax - lmin
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if lspan == 0:
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raise ValueError("Logarithmic scale requires min and max values to differ.")
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def value_to_x(v):
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return ZERO_X + SCALE_LEN * (math.log(v) - lmin) / lspan
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def major_value(i):
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return min_val * (max_val / min_val) ** (i / big_ticks)
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else:
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span = max_val - min_val
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def value_to_x(v):
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if span == 0:
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return ZERO_X
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return ZERO_X + SCALE_LEN * (v - min_val) / span
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def major_value(i):
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return min_val + (max_val - min_val) * i / big_ticks
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big_interval = SCALE_LEN / big_ticks
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# Major ticks are always physically evenly spaced; only their values differ.
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big_xs = [ZERO_X + i * big_interval for i in range(big_ticks + 1)]
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big_vals = [major_value(i) for i in range(big_ticks + 1)]
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# Custom labels, when supplied, override the calculated numbers and set the count.
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if custom_labels:
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label_count = max(1, min(len(custom_labels), big_ticks + 1))
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custom_labels = custom_labels[:label_count]
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else:
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label_count = max(2, min(label_count, big_ticks + 1))
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if label_count == 1:
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label_indices = [0]
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else:
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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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]
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if use_paths:
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parts.append(' <g transform="translate(-37.352226,-90.454928)">')
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else:
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parts += [_FONT_FACE, ' <g transform="translate(-37.352226,-90.454928)">']
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parts.append(
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' <path style="fill:#ffffff;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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)
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if use_paths:
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parts += [
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' ' + _text_to_paths(
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unit, 41.455711, 109.03796, _unit_font_size(unit),
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wrap_transform=f'scale({_UNIT_SCALE_X},1.0364155)'
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),
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' ' + _text_to_paths(range_label, 184.79707, 113.6755, 3.60539),
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]
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else:
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fs = _unit_font_size(unit)
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parts += [
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f' <text style="font-size:{fs:.4f}px;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({_UNIT_SCALE_X},1.0364155)">{escape(unit)}</text>',
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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 — evenly spaced in value, then positioned by the scale mapping.
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# On a linear scale this is uniform; on a log scale they crowd toward the high end.
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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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v = big_vals[i] + j * (big_vals[i + 1] - big_vals[i]) / sub
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x = value_to_x(v)
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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
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for k, idx in enumerate(label_indices):
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x = big_xs[idx]
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label = custom_labels[k] if custom_labels else _fmt(big_vals[idx])
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if use_paths:
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parts.append(' ' + _text_to_paths(label, x, 101.49598, label_size, anchor='middle'))
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else:
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parts.append(
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f' <text style="font-size:{label_size:.5f}px;font-family:\'ГОСТ тип А\',monospace;fill:#1a1a1a"'
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f' text-anchor="middle" x="{x:.5f}" y="101.49598">{escape(label)}</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', logo_b64=_LOGO_B64, version=VERSION)
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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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use_paths = request.form.get('output_mode', 'paths') == 'paths'
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log_scale = request.form.get('scale_type', 'linear') == 'log'
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custom_labels = [s.strip() for s in request.form.get('labels', '').split(',') if s.strip()] or None
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label_size = max(0.5, min(25.0, float(request.form.get('label_size', 9))))
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try:
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svg = generate_svg(unit, min_val, max_val, range_label, big_ticks, small_ticks,
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label_count, use_paths, log_scale, custom_labels, label_size)
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except ValueError as err:
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return Response(str(err), status=400, mimetype='text/plain')
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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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