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Use the published Wallace threadcount, and scale the weave to the sett

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Two separate faults. The pattern was wrong, and the scale was broken.

Pattern: the sett is published as K/4 R32 K32 Y/4, the slashes marking
pivots, which reflects out to K4 R32 K32 Y4 K32 R32 — 136 threads, about
half black and half red with a yellow line worth 3%. I had the structure
inverted: the yellow overstripe belongs down the centre of a wide black
band, and the narrow black guard belongs between two red blocks. Mine put
yellow between narrow blacks and the wide black elsewhere, which is why it
read as a generic check rather than as Wallace.

Scale: thread width was a fixed fraction of the screen while the sett grew
from 84 threads to 216, so a repeat became 933dp on a 360dp phone and only
0.39 of one was ever visible. The cloth had zoomed into a few enormous
blocks and stopped being a weave at all — that is the part that got worse,
not the colours. Thread width is now derived from the sett, so a couple of
full repeats are on screen whatever the threadcount says, and changing the
count rescales instead of silently magnifying.

The icon is generated from the same numbers at one repeat across the
adaptive safe zone.

Threadcount cross-checked against two independent sources rather than
guessed; recorded in Tartan.kt and the README so the next change starts
from the published figures.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015qjfMiPUDshdKEUa6vxqzN
This commit is contained in:
Claude
2026-08-06 04:14:08 +00:00
parent 510fd40d86
commit f5a2626196
6 changed files with 183 additions and 165 deletions
Download Patch File Download Diff File Expand all files Collapse all files
app/src/main/res/drawable/ic_launcher_background.xml
+46 -47
View File
@@ -2,13 +2,16 @@
<!--
A single square of the Wallace tartan, set on the bias.
Generated from the same sett as WallaceSett in Tartan.kt: a half-sett of
gold 6, black 6, red 36, black 24, red 36, black 6, reflected about its
pivots. Warp is drawn opaque, weft over it at half opacity, which is what
gives the blended squares rather than a flat grid.
Generated from the published threadcount K/4 R32 K32 Y/4 — the same numbers
as WallaceSett in Tartan.kt. The slashes are pivots, so the half-sett
reflects out to K4 R32 K32 Y4 K32 R32: the yellow overstripe runs down the
centre of a wide black band, and the narrow black guard splits the red into
pairs.
The paths run well past the viewport because the whole thing is rotated 45
degrees; the overspill is what keeps the corners covered.
Warp is opaque, weft laid over it at half opacity, which is what gives the
blended squares rather than a flat grid. Paths run well past the viewport
because the group is rotated 45 degrees; the overspill keeps the corners
covered. One full repeat fills the adaptive icon's safe zone.
-->
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="108dp"
@@ -20,46 +23,42 @@
android:pivotX="54.0"
android:pivotY="54.0">
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