egutierrez
448765fa15
Timeline widget with:
- Header: play/pause + reset + duration drag + loop checkbox
- Ruler: 0.5s ticks, scrub via click+drag
- Tracks: horizontal rows with diamond-shaped draggable keyframes
- Playhead: vertical primary_light line + ruler triangle marker
State and types:
- Keyframe { time, value, ease }
- Track { name, vector<Keyframe> }
- TimelineState { tracks, current_time, duration, playing, loop }
Pure functions:
- track_value_at(track, t): interp between keys, ease applied via the
destination keyframe (Maya/AfterEffects convention)
- timeline_update(state, dt): advance current_time, wrap or saturate
Render with fn_tokens for visual coherence with the rest of the design
system. Keys are sorted by time on every changed frame to keep order
consistent during drag.
68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
#pragma once
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// timeline — widget tipo DAW: tracks horizontales con keyframes interpolados,
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// scrub y play/pause. Sirve para animar valores escalares (uniforms shader,
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// parametros UI, etc) a lo largo del tiempo.
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//
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// Estado puro (TimelineState) + funciones puras de interpolacion
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// (track_value_at) + render impuro (timeline_widget).
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//
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// Uso:
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// static fn::TimelineState tl;
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// tl.tracks.push_back({"hue", {{0,0}, {2,1}, {4,0}}});
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// tl.duration = 4.0f;
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//
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// fn::timeline_update(tl, dt);
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// float h = fn::track_value_at(tl.tracks[0], tl.current_time);
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// fn::timeline_widget("##tl", tl);
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#include "core/tween_curves.h"
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#include <imgui.h>
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#include <string>
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#include <vector>
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namespace fn {
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struct Keyframe {
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float time;
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float value;
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tween::Ease ease = tween::Ease::Linear;
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};
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struct Track {
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std::string name;
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std::vector<Keyframe> keys;
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};
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struct TimelineState {
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std::vector<Track> tracks;
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float current_time = 0.0f;
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float duration = 5.0f;
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bool playing = false;
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bool loop = true;
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};
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// --- Pure -------------------------------------------------------------------
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// Interpola el valor de `track` en el tiempo `t`. Asume keys ordenadas por
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// time. Si `t` cae antes del primer keyframe devuelve el value del primero;
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// si cae despues del ultimo, devuelve el value del ultimo. Entre keyframes
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// usa el ease de la SEGUNDA key (la "curva entrante" hasta esa key).
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float track_value_at(const Track& track, float t);
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// --- Update -----------------------------------------------------------------
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// Avanza current_time si playing. Si loop=true hace wrap; si no, satura en
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// duration y pone playing=false al llegar.
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void timeline_update(TimelineState& s, float dt);
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// --- Render -----------------------------------------------------------------
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// Widget completo: cabecera con play/pause + tiempo, ruler con scrub, y un
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// panel por track con keyframes draggable. Devuelve true si el usuario hizo
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// algun cambio (drag de keyframe, scrub, play/pause).
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bool timeline_widget(const char* id, TimelineState& s, ImVec2 size = ImVec2(-1, 200));
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} // namespace fn
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