text: /**
   * Copyright 2014 Google Inc. All rights reserved.
   *
   * 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.
   */
  
  /**
   * @author jkadams
   */
  provide('Dance.Direction');
  
  Dance.Direction = { UP: 0, RIGHT: 1, DOWN: 2, LEFT: 3 };
  
  Dance.Direction.opposite = function(direction) {
    switch (direction) {
      case Dance.Direction.UP:
        return Dance.Direction.DOWN;
      case Dance.Direction.RIGHT:
        return Dance.Direction.LEFT;
      case Dance.Direction.DOWN:
        return Dance.Direction.UP;
      case Dance.Direction.LEFT:
        return Dance.Direction.RIGHT;
      default:
        return null;
    }
  };