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import type {
AnimationPropertyPath,
ElementAnimations,
VectorAnimationChannel,
VectorValue,
} from "@/lib/animation/types";
export function isVectorValue(value: unknown): value is VectorValue {
return (
typeof value === "object" &&
value !== null &&
"x" in value &&
"y" in value &&
typeof (value as VectorValue).x === "number" &&
typeof (value as VectorValue).y === "number"
);
}
export function getVectorChannelForPath({
animations,
propertyPath,
}: {
animations: ElementAnimations | undefined;
propertyPath: AnimationPropertyPath;
}): VectorAnimationChannel | undefined {
const channel = animations?.channels[propertyPath];
if (!channel || channel.valueKind !== "vector") {
return undefined;
}
return channel;
}
export function getVectorChannelValueAtTime({
channel,
time,
fallbackValue,
}: {
channel: VectorAnimationChannel | undefined;
time: number;
fallbackValue: VectorValue;
}): VectorValue {
if (!channel || channel.keyframes.length === 0) {
return fallbackValue;
}
const keyframes = [...channel.keyframes].sort((a, b) => a.time - b.time);
const first = keyframes[0];
const last = keyframes[keyframes.length - 1];
if (!first || !last) return fallbackValue;
if (time <= first.time) return first.value;
if (time >= last.time) return last.value;
for (let i = 0; i < keyframes.length - 1; i++) {
const left = keyframes[i];
const right = keyframes[i + 1];
if (time < left.time || time > right.time) continue;
if (left.interpolation === "hold") return left.value;
const span = right.time - left.time;
if (span === 0) return right.value;
const t = (time - left.time) / span;
return {
x: left.value.x + (right.value.x - left.value.x) * t,
y: left.value.y + (right.value.y - left.value.y) * t,
};
}
return last.value;
}
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