52 lines
844 B
JavaScript
52 lines
844 B
JavaScript
/**
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* Cylindrical CIE LUV
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*
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* @module color-space/lchuv
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*/
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import luv from './luv.js';
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import xyz from './xyz.js';
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// cylindrical luv
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var lchuv = {
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name: 'lchuv',
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channel: ['lightness', 'chroma', 'hue'],
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alias: ['LCHuv', 'cielchuv'],
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min: [0, 0, 0],
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max: [100, 100, 360],
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luv: function (luv) {
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var l = luv[0],
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c = luv[1],
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h = luv[2],
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u, v, hr;
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hr = h / 360 * 2 * Math.PI;
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u = c * Math.cos(hr);
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v = c * Math.sin(hr);
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return [l, u, v];
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},
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xyz: function (arg) {
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return luv.xyz(lchuv.luv(arg));
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}
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};
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export default (lchuv);
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luv.lchuv = function (luv) {
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var l = luv[0], u = luv[1], v = luv[2];
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var c = Math.sqrt(u * u + v * v);
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var hr = Math.atan2(v, u);
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var h = hr * 360 / 2 / Math.PI;
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if (h < 0) {
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h += 360;
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}
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return [l, c, h]
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};
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xyz.lchuv = function (arg) {
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return luv.lchuv(xyz.luv(arg));
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};
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