// Add a roof if a wall is clicked on
  // If a wall wasn't clicked on return false
  public boolean addRoof(float x, float y) {
    WallModel wall = isOnWall(x, y);

    if (wall != null) {
      currentRoof = new RoofModel(wall);
      tempRoof = currentRoof.clone(1);
      roofs.add(currentRoof);

      return true;
    }

    return false;
  }