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Krzysztof kuhy Rudnicki
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- fit.py: centre each glyph and scale it so its furthest ink sits at INK_RADIUS = 340px, compensating the unscaled stroke width - style.py: INK_RADIUS plus INK_RADIUS_DP for vector-drawable consumers - labels.py/_label_widths.py: LABELS registry; names start with a capital, ASCII letters only, <= 10 chars, <= 522 wide in the Pixel launcher font - drop centre_offset, safe_box_overflow and the CLI safe-box warning - add prompt-bubble (sufler) and camera (macro_cam) glyphs and apps Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012kQ5PCKqBHAkAVkPSvp6dk
96 lines
3.2 KiB
Python
96 lines
3.2 KiB
Python
"""Fit every glyph to the same circle: centred, with ink radius ``INK_RADIUS``.
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Hand-authored glyphs span anything from 250 to 400px, so a row of icons looked
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like different sizes (kuhy, 2026-10-23). Each glyph is rendered, its ink is
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measured, and a :class:`~python_pkg.app_icons.render.Placement` is derived that
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centres the ink box and scales it so the furthest inked pixel sits exactly
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``style.INK_RADIUS`` from the centre.
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The stroke weight does not scale with the glyph (see :func:`render.build_svg`),
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so the radius is not linear in the scale; a few measure-and-correct rounds
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converge well inside the tolerance.
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"""
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from __future__ import annotations
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from pathlib import Path
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import tempfile
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from typing import TYPE_CHECKING, Final
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import numpy as np
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from PIL import Image
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from python_pkg.app_icons import render, style
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if TYPE_CHECKING:
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from python_pkg.app_icons.glyphs import Glyph
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# Alpha above this counts as ink; the anti-aliased fringe below it does not.
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_INK_ALPHA: Final[int] = 127
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_MAX_ROUNDS: Final[int] = 8
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_TOLERANCE: Final[float] = 0.002
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def ink_geometry(png: Path) -> tuple[float, float, float]:
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"""Measure a rendered glyph.
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Parameters:
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png (Path): Transparent render of the glyph alone.
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Returns:
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tuple[float, float, float]: ``(radius, cx, cy)`` -- the ink box centre and
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the distance from it to the furthest inked pixel. All zero for no ink.
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"""
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with Image.open(png) as image:
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alpha = np.asarray(image.convert("RGBA"))[:, :, 3]
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ys, xs = np.nonzero(alpha > _INK_ALPHA)
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if xs.size == 0:
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return 0.0, 0.0, 0.0
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cx = (int(xs.min()) + int(xs.max()) + 1) / 2
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cy = (int(ys.min()) + int(ys.max()) + 1) / 2
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radius = float(np.hypot(xs + 0.5 - cx, ys + 0.5 - cy).max())
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return radius, cx, cy
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def _measure(
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glyph: Glyph, accent: str, where: render.Placement
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) -> tuple[float, float, float]:
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"""Render ``glyph`` at ``where`` and measure its ink."""
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svg = render.build_svg(glyph, accent, with_background=False, offset=where)
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with tempfile.TemporaryDirectory() as tmp:
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png = Path(tmp) / "probe.png"
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render.rasterise(svg, png, style.CANVAS)
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return ink_geometry(png)
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def placement(glyph: Glyph, accent: str) -> render.Placement:
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"""Find the placement that centres a glyph on the family ink circle.
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Parameters:
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glyph (Glyph): Artwork to fit.
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accent (str): Hex colour to render with; it does not affect the result,
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but rsvg-convert needs a concrete value.
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Returns:
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render.Placement: Transform to pass to :func:`render.build_svg`.
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Raises:
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render.EmptyGlyphError: If the glyph renders no visible ink.
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"""
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where = render.IDENTITY
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for _ in range(_MAX_ROUNDS):
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radius, cx, cy = _measure(glyph, accent, where)
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if radius == 0:
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raise render.EmptyGlyphError(glyph.name)
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factor = style.INK_RADIUS / radius
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# Move the ink centre onto the canvas centre, then scale about it:
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# p -> C + factor * (scale*p + d - c).
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where = render.Placement(
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dx=style.CENTRE + factor * (where.dx - cx),
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dy=style.CENTRE + factor * (where.dy - cy),
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scale=where.scale * factor,
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)
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if abs(factor - 1) <= _TOLERANCE:
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break
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return where
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