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Scale unit label font size to fit left panel for multi-character strings

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Adrian A. Baumann
2026-07-12 00:48:18 +02:00
parent 5f09fb5c8c
commit 4a574bffb2
1 changed files with 11 additions and 1 deletions
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web/app.py
+11 -1
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@@ -26,6 +26,16 @@ BIG_H = 5.0895 # major tick height
SMALL_H = 2.6683 # minor tick height SMALL_H = 2.6683 # minor tick height
_UNIT_AREA_WIDTH = 18.445 # canvas mm available for the unit label
_UNIT_SCALE_X = 0.96486402
_UNIT_CHAR_EM = 0.65 # approximate advance-width ratio for GOST typ A
def _unit_font_size(unit: str) -> float:
n = max(1, len(unit))
return min(18.7981, _UNIT_AREA_WIDTH / (n * _UNIT_SCALE_X * _UNIT_CHAR_EM))
def _fmt(v: float) -> str: def _fmt(v: float) -> str:
if v == int(v): if v == int(v):
return str(int(v)) return str(int(v))
@@ -54,7 +64,7 @@ def generate_svg(unit, min_val, max_val, range_label, big_ticks, small_ticks, la
' M 58.443978,107.54692 H 183.64409 v 6.19963 H 58.443978 Z" />', ' M 58.443978,107.54692 H 183.64409 v 6.19963 H 58.443978 Z" />',
# Unit label (large letter in left panel) # Unit label (large letter in left panel)
f' <text style="font-size:18.7981px;font-family:\'ГОСТ тип А\',monospace;fill:#1a1a1a"' f' <text style="font-size:{_unit_font_size(unit):.4f}px;font-family:\'ГОСТ тип А\',monospace;fill:#1a1a1a"'
f' x="41.455711" y="109.03796"' f' x="41.455711" y="109.03796"'
f' transform="scale(0.96486402,1.0364155)">{escape(unit)}</text>', f' transform="scale(0.96486402,1.0364155)">{escape(unit)}</text>',