Initial Commit

node_modules/color-space/lchuv.js

@@ -0,0 +1,51 @@
+/**
+ * Cylindrical CIE LUV
+ *
+ * @module color-space/lchuv
+ */
+import luv from './luv.js';
+import xyz from './xyz.js';
+
+// cylindrical luv
+var lchuv = {
+	name: 'lchuv',
+	channel: ['lightness', 'chroma', 'hue'],
+	alias: ['LCHuv', 'cielchuv'],
+	min: [0, 0, 0],
+	max: [100, 100, 360],
+
+	luv: function (luv) {
+		var l = luv[0],
+			c = luv[1],
+			h = luv[2],
+			u, v, hr;
+
+		hr = h / 360 * 2 * Math.PI;
+		u = c * Math.cos(hr);
+		v = c * Math.sin(hr);
+		return [l, u, v];
+	},
+
+	xyz: function (arg) {
+		return luv.xyz(lchuv.luv(arg));
+	}
+};
+
+export default (lchuv);
+
+luv.lchuv = function (luv) {
+	var l = luv[0], u = luv[1], v = luv[2];
+
+	var c = Math.sqrt(u * u + v * v);
+	var hr = Math.atan2(v, u);
+	var h = hr * 360 / 2 / Math.PI;
+	if (h < 0) {
+		h += 360;
+	}
+
+	return [l, c, h]
+};
+
+xyz.lchuv = function (arg) {
+	return luv.lchuv(xyz.luv(arg));
+};