dd7edd5e38
sylpheed-port corrected the disc figure I compared against: the leaf's final segment HOLDS, so a cycle length is not a motion duration. Verified from the disc rather than accepted -- pteff03 moves over t=0..540 of a 600-unit cycle (4.000 px/unit, not 3.600) and pteff03a over 0..630 of 720 (4.063, not 3.556). Checking that sent me back to my own measurement, which was worse. "6-7 px/frame" came from eyeballing deltas between consecutive APPEARANCES in a capture that skips frames, so a delta of 7 often spans two frames. A least-squares fit of x against frame over all 132/112 points gives +4.287 and -4.348 px/frame, with rms residuals of 3.6 and 3.3 px. So the confirmation I reported was a prediction 20 % too low meeting a measurement 50 % too high. Neither number was right and the agreement was an artefact of both being wrong -- which is the most dangerous form of agreement in this corpus, because nothing about it looked suspicious. The corrected numbers say something larger than the claim they replace. Measured against declared: 4.287/4.000 = 1.072 units per frame, and 4.348/4.063 = 1.070. Two independent strips with different cycle lengths and different declared rates agree to three significant figures. Q1 establishes 2 units per RENDERED frame for top-level elements. So either a nested leaf record advances at about half the top-level rate, or Q1's factor does not apply to nested records. Measured, not explained, and flagged as deserving its own iteration because Q1 is load-bearing. One untested candidate recorded: 1 unit per 1/30 s of game time against the ~28.5 fps this corpus measures for the idle title gives 1.053, close to 1.07. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
66 lines
3.6 KiB
Rust
66 lines
3.6 KiB
Rust
//! The FULL extent of the two title sweep leaves, across their whole cycle.
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//!
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//! `ptloop_leaf_sweep_at.rs` samples t=340..540 — a window chosen to compare two
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//! competing fits — so it never showed how far the leaves travel. That gap let a
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//! claim stand that `ptloop01/02` "do not free-run", measured over the PARENT's
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//! 200x90 rect, which is a pivot anchor the leaf spends almost no time inside.
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//! `sylpheed-port` reports x tracks of -639..1521 and -839..1721 from their
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//! export; this checks that against the disc.
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//!
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//! cargo run -p sylpheed-formats --example ptloop_leaf_extent
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use sylpheed_formats::{pak::PakArchive, ui_layout};
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use std::path::PathBuf;
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fn main() {
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let root = PathBuf::from(std::env::var("SYLPHEED_DISC").expect("SYLPHEED_DISC"));
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let ar = PakArchive::open(root.join("dat/GP_TITLE.pak")).expect("GP_TITLE.pak");
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for entry in [4usize, 5, 7] {
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let Ok(by) = ar.read(&ar.entries()[entry]) else { continue };
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let Some(b) = ui_layout::parse_build(&by) else { continue };
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println!("\n######## GP_TITLE entry {entry} ########");
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for parent in ["ptloop01", "ptloop02"] {
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let Some(el) = b.elements.iter().find(|e| e.name.starts_with(parent)) else {
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println!(" {parent}: not present in this build"); continue };
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let Some(&(off, size)) = b.records.get(&el.name) else {
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println!(" {}: no nested record", el.name); continue };
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let span = u32::from_be_bytes(by[off + 8..off + 12].try_into().unwrap());
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let Some(lb) = ui_layout::parse_build(&by[off..off + size]) else {
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println!(" {}: leaf will not parse", el.name); continue };
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println!(" {} parent rest ({},{}) nested cycle span {span}",
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el.name, el.keyframes.last().map(|k| k.x).unwrap_or(0),
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el.keyframes.last().map(|k| k.y).unwrap_or(0));
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for le in &lb.elements {
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let (mut lo, mut hi) = (i64::MAX, i64::MIN);
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let (mut sxs, mut sys) = (Vec::new(), Vec::new());
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for t in 0..=span {
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if let Some(k) = le.pose_at(t) {
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lo = lo.min(k.x as i64); hi = hi.max(k.x as i64);
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if !sxs.contains(&k.scale_x) { sxs.push(k.scale_x) }
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if !sys.contains(&k.scale_y) { sys.push(k.scale_y) }
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}
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}
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// A CYCLE LENGTH IS NOT A MOTION DURATION. Find the last t at
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// which x still changes: sylpheed-port reports the final segment
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// HOLDS, which would make px/unit larger than cycle-based maths.
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let mut last_move = 0u32;
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let mut prev = None;
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for t in 0..=span {
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if let Some(k) = le.pose_at(t) {
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if prev.map_or(false, |p| p != k.x) { last_move = t }
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prev = Some(k.x);
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}
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}
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let w = (le.pivot_x * 2) as i64;
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println!(" leaf {:<12} pivot {}x{} quad w={w} x track {lo} .. {hi} \
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(centre {} .. {}) scale_x {:?} scale_y {:?}",
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le.name, le.pivot_x, le.pivot_y,
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lo + le.pivot_x as i64, hi + le.pivot_x as i64, sxs, sys);
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println!(" motion ends at t={last_move} of a {span}-unit cycle -> {:.3} px/unit over the MOVING span (vs {:.3} over the cycle)",
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(hi - lo) as f64 / last_move.max(1) as f64,
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(hi - lo) as f64 / span as f64);
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}
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}
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}
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println!("--- END ---");
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}
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