awesome animation framework now in with promises

src/js/visuals/tree.js

@@ -8,6 +8,36 @@ var VisBase = Backbone.Model.extend({
         this.get(key).remove();
       }
     }, this);
+  },
+
+  animateAttrKeys: function(keys, attrObj, speed, easing) {
+    // either we animate a specific subset of keys or all
+    // possible things we could animate
+    keys = _.extend(
+      {},
+      {
+        include: ['circle', 'arrow', 'rect', 'path', 'text'],
+        exclude: []
+      },
+      keys || {}
+    );
+
+    var attr = this.getAttributes();
+
+    // safely insert this attribute into all the keys we want
+    _.each(keys.include, function(key) {
+      attr[key] = _.extend(
+        {},
+        attr[key],
+        attrObj
+      );
+    });
+
+    _.each(keys.exclude, function(key) {
+      delete attr[key];
+    });
+
+    this.animateToAttr(attr, speed, easing);
   }
 });