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 王天杨
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import { invariant, clamp, MotionGlobalConfig, noop, pipe, progress } from 'motion-utils';
import { mix } from './mix/index.mjs';
function createMixers(output, ease, customMixer) {
const mixers = [];
const mixerFactory = customMixer || MotionGlobalConfig.mix || mix;
const numMixers = output.length - 1;
for (let i = 0; i < numMixers; i++) {
let mixer = mixerFactory(output[i], output[i + 1]);
if (ease) {
const easingFunction = Array.isArray(ease) ? ease[i] || noop : ease;
mixer = pipe(easingFunction, mixer);
}
mixers.push(mixer);
}
return mixers;
}
/**
* Create a function that maps from a numerical input array to a generic output array.
*
* Accepts:
* - Numbers
* - Colors (hex, hsl, hsla, rgb, rgba)
* - Complex (combinations of one or more numbers or strings)
*
* ```jsx
* const mixColor = interpolate([0, 1], ['#fff', '#000'])
*
* mixColor(0.5) // 'rgba(128, 128, 128, 1)'
* ```
*
* TODO Revisit this approach once we've moved to data models for values,
* probably not needed to pregenerate mixer functions.
*
* @public
*/
function interpolate(input, output, { clamp: isClamp = true, ease, mixer } = {}) {
const inputLength = input.length;
invariant(inputLength === output.length, "Both input and output ranges must be the same length", "range-length");
/**
* If we're only provided a single input, we can just make a function
* that returns the output.
*/
if (inputLength === 1)
return () => output[0];
if (inputLength === 2 && output[0] === output[1])
return () => output[1];
const isZeroDeltaRange = input[0] === input[1];
// If input runs highest -> lowest, reverse both arrays
if (input[0] > input[inputLength - 1]) {
input = [...input].reverse();
output = [...output].reverse();
}
const mixers = createMixers(output, ease, mixer);
const numMixers = mixers.length;
const interpolator = (v) => {
if (isZeroDeltaRange && v < input[0])
return output[0];
let i = 0;
if (numMixers > 1) {
for (; i < input.length - 2; i++) {
if (v < input[i + 1])
break;
}
}
const progressInRange = progress(input[i], input[i + 1], v);
return mixers[i](progressInRange);
};
return isClamp
? (v) => interpolator(clamp(input[0], input[inputLength - 1], v))
: interpolator;
}
export { interpolate };
//# sourceMappingURL=interpolate.mjs.map
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