js library for rgb->hsv

web/src/js/rgb2hsv.js

@@ -0,0 +1,24 @@
+//taken from https://stackoverflow.com/questions/17242144/javascript-convert-hsb-hsv-color-to-rgb-accurately
+function RGBtoHSV(r, g, b) {
+    if (arguments.length === 1) {
+        g = r.g, b = r.b, r = r.r;
+    }
+    var max = Math.max(r, g, b), min = Math.min(r, g, b),
+        d = max - min,
+        h,
+        s = (max === 0 ? 0 : d / max),
+        v = max / 255;
+
+    switch (max) {
+        case min: h = 0; break;
+        case r: h = (g - b) + d * (g < b ? 6: 0); h /= 6 * d; break;
+        case g: h = (b - r) + d * 2; h /= 6 * d; break;
+        case b: h = (r - g) + d * 4; h /= 6 * d; break;
+    }
+
+    return {
+        h: h,
+        s: s,
+        v: v
+    };
+};