Merge pull request #72 from nikkorn/#62

Added 'random' function as tree option for use by 'wait' nodes

README.md

@@ -78,6 +78,7 @@ The `BehaviourTree` constructor can take an options object as an argument, the p
 | Option          |Type | Description |
 | :--------------------|:- |:- |
 | getDeltaTime |() => number| A function returning a delta time in seconds that is used to calculate the elapsed duration of any `wait` nodes. If this function is not defined then `Date().getTime()` is used instead by default.  |
+| random |() => number| A function returning a floating-point number between 0 (inclusive) and 1 (exclusive). If defined, this function is used to source a pseudo-random number to use in the selection of active children for any `lotto` nodes. If not defined then `Math.random` will be used instead by default. This function can be useful in seeding all random numbers used in the running of a tree instance to make any behaviour completely deterministic. |
 
 # Nodes
 

dist/behaviourTreeOptions.d.ts

@@ -3,8 +3,13 @@
  */
 export interface BehaviourTreeOptions {
     /**
-     * Gets the delta time to use in seconds.
+     * Gets a delta time in seconds that is used to calculate the elapsed duration of any wait nodes.
      * @returns The delta time to use in seconds.
      */
     getDeltaTime?(): number;
+    /**
+     * Gets a pseudo-random floating-point number between 0 (inclusive) and 1 (exclusive) for use in the selection of active children for any lotto nodes.
+     * @returns A floating-point number between 0 (inclusive) and 1 (exclusive)
+     */
+    random?(): number;
 }