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import type { ElementAnimations } from "@/animation/types";
import type { NormalizedCubicBezier } from "@/animation/types";
import { getBezierPoint } from "@/animation/bezier";
import { resolveEffectParamsAtTime } from "@/animation/effect-param-channel";
import type { ParamValues } from "@/params";
import { clamp } from "@/utils/math";
import type { Transform } from "@/rendering";
import type { Effect } from "@/effects/types";
import { effectsRegistry } from "@/effects/registry";
import { BUILTIN_PRESETS } from "@/timeline/components/graph-editor/easing-presets";
const BEZIER_SOLVE_ITERATIONS = 20;
export const MOTION_EASING_OPTIONS = BUILTIN_PRESETS.map((preset) => ({
value: preset.id,
label: preset.label,
}));
export function getMotionIntensity({
effectParams,
}: {
effectParams: ParamValues;
}): number {
const raw = effectParams.intensity;
const intensity = typeof raw === "number" ? raw : Number.parseFloat(String(raw));
if (!Number.isFinite(intensity)) return 1;
return clamp({ value: intensity / 100, min: 0, max: 1 });
}
export function sampleEasingBezier({
bezier,
x,
}: {
bezier: NormalizedCubicBezier;
x: number;
}): number {
const [x1, y1, x2, y2] = bezier;
let lower = 0;
let upper = 1;
for (let iteration = 0; iteration < BEZIER_SOLVE_ITERATIONS; iteration++) {
const mid = (lower + upper) / 2;
const estimate = getBezierPoint({
progress: mid,
p0: 0,
p1: x1,
p2: x2,
p3: 1,
});
if (estimate < x) {
lower = mid;
} else {
upper = mid;
}
}
return getBezierPoint({
progress: (lower + upper) / 2,
p0: 0,
p1: y1,
p2: y2,
p3: 1,
});
}
export function applyMotionEffects({
baseTransform,
effects,
animations,
localTime,
duration,
canvasWidth,
canvasHeight,
}: {
baseTransform: Transform;
effects: Effect[] | undefined;
animations: ElementAnimations | undefined;
localTime: number;
duration: number;
canvasWidth: number;
canvasHeight: number;
}): Transform {
const motionEffects = (effects ?? []).filter(
(effect) => effect.enabled && effectsRegistry.get(effect.type).motion,
);
if (motionEffects.length === 0 || duration <= 0) {
return baseTransform;
}
const linearProgress = clamp({
value: localTime / duration,
min: 0,
max: 1,
});
let scale = 1;
let translateX = 0;
let translateY = 0;
for (const effect of motionEffects) {
const definition = effectsRegistry.get(effect.type);
if (!definition.motion) continue;
const resolvedParams = resolveEffectParamsAtTime({
effectId: effect.id,
params: effect.params,
animations,
localTime,
});
const progress = sampleEasingBezier({
bezier:
BUILTIN_PRESETS.find((entry) => entry.id === resolvedParams.easing)
?.value ?? [0.25, 0.1, 0.25, 1],
x: linearProgress,
});
const offset = definition.motion.evaluate({
effectParams: resolvedParams,
progress,
});
scale *= offset.scale;
translateX += offset.translateX;
translateY += offset.translateY;
}
return {
scaleX: baseTransform.scaleX * scale,
scaleY: baseTransform.scaleY * scale,
position: {
x: baseTransform.position.x + translateX * canvasWidth,
y: baseTransform.position.y + translateY * canvasHeight,
},
rotate: baseTransform.rotate,
};
}
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