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re(ui): rotation is not nested-only, and the pivot-anchored scale is measured

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Two corrections and one new confirmation, all from finishing the sweep I
left running last iteration.

Refuted, by my own sweep, within the hour: "rotation appears to live only
in nested .rat leaf records". That held for GP_TITLE, GP_BUNK and
GP_CHALLENGE -- the three archives the sweep had reached when I wrote it
-- and fails on GP_DIALOG and GP_DEBRIEFING_PILOTLOG, which rotate
top-level elements. Scoping the claim made it cheap to withdraw, but the
sentence should have waited for the sweep.

Those top-level cases are the best evidence on the disc, and they show up
in `screen info --geometry` without a hex dump. GP_DIALOG build 0:
pceff03/pceff04 ramp r = 90 -> 30 -> 10 -> 3 -> 0 while alpha ramps
0 -> 255 and they slide into place -- a swing-in settling upright. Build
6: pzeff02 ramps 43 -> 61 -> 75 -> 90 while scaling 112% -> 200% and
fading to 0 -- a spin-out. Rows committed as reference data.

New: the pivot-anchored scale term in blit, kf.x - pivot*(scale-100)/100,
was implemented and reasoned about but never measured, because every
element previously examined sits at 100% scale where the term is exactly
zero. The ptloop pair scale 600% and 800%, where it is worth 450 and 630
px. Formula predicts centre y = 360.0 for both; capture measures 359.1
and 360.0. Top-left anchoring predicts 810 and 990. Horizontally it makes
t-from-position agree with t-from-alpha to 0.33 / 0.65 units against ~8
without it.

That agreement does NOT prove linear interpolation -- both fields were
inverted through the same linear map, so a shared easing curve cancels.
It shows position and alpha ride one shared parameter. Recorded as such.

The disc-wide sweep is still running; the count is incomplete, the
existence is settled.
This commit is contained in:
Sylpheed RE agent
2026-08-28 22:46:44 +00:00
parent ffd1a30ba7
commit f5097779e4
5 changed files with 124 additions and 15 deletions
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7
docs/re/data/rotation-top-level-examples.txt Normal file
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# `sylpheed-cli screen info --geometry`, rows with a non-zero rotation (r=).
# GP_DIALOG builds 0 and 6; GP_DEBRIEFING_PILOTLOG build 10. 2026-08-28
4 pceff03.t32 247x281 38x38 NO 8: 630,348 100%,100% a=0 r=90 12: 550,273 100%,100% a=128 r=30 14: 510,235 100%,100% a=192 r=10 16: 490,217 100%,100% a=224 r=3 52: 470,198 100%,100% a=255 58: 470,198 100%,100% a=255 -: 470,198 100%,100% a=0
5 pceff04.t32 257x311 478x586 NO 8: 413,77 100%,100% a=0 r=90 12: 483,167 100%,100% a=128 r=30 14: 518,212 100%,100% a=192 r=10 16: 536,234 100%,100% a=224 r=3 52: 553,247 100%,100% a=255 58: 553,247 100%,100% a=255 -: 553,247 100%,100% a=0
1 pzeff02.t32 529x519 528x524 NO 197: 376,58 0%,0% a=0 217: 376,58 112%,112% a=255 r=43 232: 376,58 145%,145% a=64 r=61 237: 376,58 173%,173% a=32 r=75 -: 376,58 200%,200% a=0 r=90
5 pjeff24a.t32 382x140 610x622 NO -: 335,49 210%,210% a=53 r=90