initial commit. phase 1 complete

frontend/node_modules/culori/src/lch/definition.js

@@ -0,0 +1,55 @@
+import convertLabToLch from './convertLabToLch.js';
+import convertLchToLab from './convertLchToLab.js';
+import convertLabToRgb from '../lab/convertLabToRgb.js';
+import convertRgbToLab from '../lab/convertRgbToLab.js';
+import parseLch from './parseLch.js';
+import { fixupHueShorter } from '../fixup/hue.js';
+import { fixupAlpha } from '../fixup/alpha.js';
+import { interpolatorLinear } from '../interpolate/linear.js';
+import { differenceHueChroma } from '../difference.js';
+import { averageAngle } from '../average.js';
+
+const definition = {
+	mode: 'lch',
+
+	toMode: {
+		lab: convertLchToLab,
+		rgb: c => convertLabToRgb(convertLchToLab(c))
+	},
+
+	fromMode: {
+		rgb: c => convertLabToLch(convertRgbToLab(c)),
+		lab: convertLabToLch
+	},
+
+	channels: ['l', 'c', 'h', 'alpha'],
+
+	ranges: {
+		l: [0, 100],
+		c: [0, 150],
+		h: [0, 360]
+	},
+
+	parse: [parseLch],
+	serialize: c =>
+		`lch(${c.l !== undefined ? c.l : 'none'} ${
+			c.c !== undefined ? c.c : 'none'
+		} ${c.h || 0}${c.alpha < 1 ? ` / ${c.alpha}` : ''})`,
+
+	interpolate: {
+		h: { use: interpolatorLinear, fixup: fixupHueShorter },
+		c: interpolatorLinear,
+		l: interpolatorLinear,
+		alpha: { use: interpolatorLinear, fixup: fixupAlpha }
+	},
+
+	difference: {
+		h: differenceHueChroma
+	},
+
+	average: {
+		h: averageAngle
+	}
+};
+
+export default definition;