1 files changed, 51 insertions, 0 deletions
diff --git a/framework/src/onos/web/gui/src/main/webapp/app/fw/util/random.js b/framework/src/onos/web/gui/src/main/webapp/app/fw/util/random.js
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+++ b/framework/src/onos/web/gui/src/main/webapp/app/fw/util/random.js
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+/*
+ * Copyright 2014,2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ ONOS GUI -- Random -- Encapsulated randomness
+ */
+(function () {
+    'use strict';
+
+    var $log, fs;
+
+    var halfRoot2 = 0.7071;
+
+    // given some value, s, returns an integer between -s/2 and s/2
+    // e.g. s = 100; result in the range [-50..50)
+    function spread(s) {
+        return Math.floor((Math.random() * s) - s / 2);
+    }
+
+    // for a given dimension, d, choose a random value somewhere between
+    // 0 and d where the value is within (d / (2 * sqrt(2))) of d/2.
+    function randDim(d) {
+        return d / 2 + spread(d * halfRoot2);
+    }
+
+    angular.module('onosUtil')
+        .factory('RandomService', ['$log', 'FnService',
+
+        function (_$log_, _fs_) {
+            $log = _$log_;
+            fs = _fs_;
+
+            return {
+                spread: spread,
+                randDim: randDim
+            };
+        }]);
+}());