protected void setEyePosition(
      AnimationController animControl,
      View view,
      Position position,
      ViewInputAttributes.ActionAttributes attrib) {

    MoveToPositionAnimator posAnimator =
        (MoveToPositionAnimator) animControl.get(VIEW_ANIM_POSITION);

    double smoothing = attrib.getSmoothingValue();
    if (!(attrib.isEnableSmoothing() && this.isEnableSmoothing())) smoothing = 0.0;

    if (smoothing != 0.0) {

      double elevation =
          ((FlyViewLimits) view.getViewPropertyLimits())
              .limitEyeElevation(position, view.getGlobe());
      if (elevation != position.getElevation()) {
        position = new Position(position, elevation);
      }
      if (posAnimator == null) {
        posAnimator =
            new MoveToPositionAnimator(
                view.getEyePosition(),
                position,
                smoothing,
                OrbitViewPropertyAccessor.createEyePositionAccessor(view));
        animControl.put(VIEW_ANIM_POSITION, posAnimator);
      } else {
        posAnimator.setEnd(position);
        posAnimator.start();
      }
    }
    view.firePropertyChange(AVKey.VIEW, null, view);
  }
  protected void onHorizontalTranslateRel(
      Angle forwardChange, Angle sideChange, ViewInputAttributes.ActionAttributes actionAttribs) {
    View view = this.getView();
    if (view == null) // include this test to ensure any derived implementation performs it
    {
      return;
    }

    if (forwardChange.equals(Angle.ZERO) && sideChange.equals(Angle.ZERO)) {
      return;
    }

    if (view instanceof BasicFlyView) {

      Vec4 forward = view.getForwardVector();
      Vec4 up = view.getUpVector();
      Vec4 side = forward.transformBy3(Matrix.fromAxisAngle(Angle.fromDegrees(90), up));

      forward = forward.multiply3(forwardChange.getDegrees());
      side = side.multiply3(sideChange.getDegrees());
      Vec4 eyePoint = view.getEyePoint();
      eyePoint = eyePoint.add3(forward.add3(side));
      Position newPosition = view.getGlobe().computePositionFromPoint(eyePoint);

      this.setEyePosition(this.uiAnimControl, view, newPosition, actionAttribs);
      view.firePropertyChange(AVKey.VIEW, null, view);
    }
  }