added cost property

Author: paulrobello

src/core/Node.js

@@ -6,8 +6,9 @@
  * @param {number} x - The x coordinate of the node on the grid.
  * @param {number} y - The y coordinate of the node on the grid.
  * @param {boolean} [walkable] - Whether this node is walkable.
+ * @param {number} [cost] - node cost used by finders that allow non-uniform node costs
  */
-function Node(x, y, walkable) {
+function Node(x, y, walkable, cost) {
     /**
      * The x coordinate of the node on the grid.
      * @type number
@@ -23,6 +24,11 @@ function Node(x, y, walkable) {
      * @type boolean
      */
     this.walkable = (walkable === undefined ? true : walkable);
+    /**
+     * Cost to walk this node if its walkable
+     * @type number
+     */
+    this.cost = (cost === undefined) ? 0 : cost;
 }
 
 module.exports = Node;