Current Dev State

static/js/ketcher2/node_modules/rgb2hex/index.js

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+/**
+ * rgb2hex
+ *
+ * @author Christian Bromann <mail@christian-bromann.com>
+ * @description converts rgba color to HEX
+ *
+ * @param  {String} color  rgb or rgba color
+ * @return {Object}        object with hex and alpha value
+ */
+
+var rgb2hex = module.exports = function rgb2hex(color) {
+
+    if(typeof color !== 'string') {
+        // throw error of input isn't typeof string
+        throw new Error('color has to be type of `string`');
+    } else if (color.substr(0, 1) === '#') {
+        // or return if already rgb color
+        return {
+            hex: color,
+            alpha: 1
+        };
+    }
+
+    // parse input
+    var digits = /(.*?)rgb(a)*\((\d+),(\d+),(\d+)(,[0-9]*\.*[0-9]+)*\)/.exec(color.replace(/\s+/g,''));
+
+    if(!digits) {
+        // or throw error if input isn't a valid rgb(a) color
+        throw new Error('given color (' + color + ') isn\'t a valid rgb or rgba color');
+    }
+
+    var red = parseInt(digits[3]);
+    var green = parseInt(digits[4]);
+    var blue = parseInt(digits[5]);
+    var alpha = digits[6] ? /([0-9\.]+)/.exec(digits[6])[0] : '1';
+    var rgb = ((blue | green << 8 | red << 16) | 1 << 24).toString(16).slice(1);
+
+    // parse alpha value into float
+    if(alpha.substr(0,1) === '.') {
+        alpha = parseFloat('0' + alpha, 10);
+    }
+
+    // limit alpha value to 1
+    if(alpha > 1) {
+        alpha = 1;
+    }
+
+    // cut alpha value after 2 digits after comma
+    alpha = parseFloat(Math.round(alpha * 100), 10) / 100;
+
+    return {
+        hex: digits[1] + '#' + rgb.toString(16),
+        alpha: alpha
+    }
+
+};