Orkuncakilkaya
e4d1e95dcb
Two ECS-native, deterministic namespaces for 2D motion, driven off the fixed
frame clock so replays and lockstep netcode reproduce every frame and every
eased value exactly. Both are pure computed-inline Q16.16 / integer math (no new
runtime, no heap) — the game stores a timer on a component and calls these each
frame, exactly the way Collision.* / Grid.* are used.
Anim.* — spritesheet frame animation:
- Anim.frame(timer,fps,count) -> int looping frame index
- Anim.once(timer,fps,count) -> int one-shot, clamps on the last frame
- Anim.pingpong(timer,fps,count) -> int bounce 0..count-1..0
- Anim.finished(timer,fps,count) -> bool has a one-shot run past its end?
- Anim.duration(fps,count) -> fixed seconds for one cycle
- Anim.cell_x/cell_y(frame,cols,cell) -> int source rect on a grid sheet
Tween.* — value interpolation over a timeline:
- Tween.progress/loop/yoyo(timer,duration) -> fixed normalized amount
- Tween.done(timer,duration) -> bool
- Tween.ease(t, mode) -> fixed shape by a literal curve 0..6,
the same curves as Ease.* (now
factored into a shared ease_eval)
- Tween.number/round/point/tint(from,to,t) blend a fixed / int / Vector / color
The typed blends reuse the existing fixed / Vector / color helpers, and
Tween.ease shares Ease.*'s exact formulas via the new ease_eval(mode,t) — one
source of truth for every easing curve in the engine.
examples/library/anim.ludic asserts 34 cases (frame math, clamping, ping-pong,
cell geometry, timeline clamp/loop/yoyo, rounding, color/vector blends, and
Ease.in == Tween.ease(.,1)); wired into x test (now 62 passed). Docs: Anim +
Tween sections with 16 per-symbol pages, inventory/coverage green. Seed
reseeded; the C-free bootstrap fixpoint holds.
The stateful sugar the proposal sketches (named clips, Anim.play, fluent
Tween.chain/parallel handles, and an auto-injected advance system) is deliberately
left as a follow-up — this lands the deterministic math core both halves stand on.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
31 lines
1,021 B
Markdown
31 lines
1,021 B
Markdown
---
|
|
id: tween-progress
|
|
name: Tween.progress
|
|
category: tween
|
|
kind: namespace-method
|
|
tokens: Tween.progress
|
|
sig: Tween.progress(timer, duration) -> fixed
|
|
tip: A one-shot 0..1 amount, clamped, for timer over duration.
|
|
order: 1
|
|
ns: Tween
|
|
member: progress
|
|
---
|
|
|
|
Returns <code>timer / duration</code> clamped to <code>0.0</code>..<code>1.0</code> — the normalized progress of a one-shot tween. Feed it to <a href="tween-ease"><code>Tween.ease</code></a> to shape it, then to a typed blend. Once <code>timer</code> reaches <code>duration</code> it pins at <code>1.0</code> (a non-positive <code>duration</code> also reads as done).
|
|
|
|
Parameters:
|
|
- `timer` — elapsed seconds (a `fixed`)
|
|
- `duration` — the tween's length in seconds (a `fixed`)
|
|
|
|
```ludic
|
|
program Demo {
|
|
property Fade { timer: fixed = 0.0 }
|
|
model Panel { Fade }
|
|
handler Run phase Update {
|
|
Fade.timer = Fade.timer + Time.delta()
|
|
let t = Tween.progress(Fade.timer, fixed(1))
|
|
let a = Tween.round(0, 255, Tween.ease(t, 2))
|
|
print(a)
|
|
}
|
|
}
|
|
```
|