hue.js•1.03 kB
import normalizeHue from '../util/normalizeHue.js';
const hue = (hues, fn) => {
return hues
.map((hue, idx, arr) => {
if (hue === undefined) {
return hue;
}
let normalized = normalizeHue(hue);
if (idx === 0 || hues[idx - 1] === undefined) {
return normalized;
}
return fn(normalized - normalizeHue(arr[idx - 1]));
})
.reduce((acc, curr) => {
if (
!acc.length ||
curr === undefined ||
acc[acc.length - 1] === undefined
) {
acc.push(curr);
return acc;
}
acc.push(curr + acc[acc.length - 1]);
return acc;
}, []);
};
const fixupHueShorter = arr =>
hue(arr, d => (Math.abs(d) <= 180 ? d : d - 360 * Math.sign(d)));
const fixupHueLonger = arr =>
hue(arr, d => (Math.abs(d) >= 180 || d === 0 ? d : d - 360 * Math.sign(d)));
const fixupHueIncreasing = arr => hue(arr, d => (d >= 0 ? d : d + 360));
const fixupHueDecreasing = arr => hue(arr, d => (d <= 0 ? d : d - 360));
export {
fixupHueShorter,
fixupHueLonger,
fixupHueIncreasing,
fixupHueDecreasing
};