/// <summary>
 /// Constructor to explicitly set all animation values.
 /// </summary>
 /// <param name="zoomCenterClass">Defines which spot the animation will use as zoom spot.</param>
 /// <param name="startZoomFactor">Initial zoom factor. This value is normally near <c>1</c>.</param>
 /// <param name="endZoomFactor">End zoom factor. This value could be <see cref="KenBurnsEffects.KENBURNS_DEFAULT_ZOOM_FACTOR"/>.</param>
 public KenBurnsZoomEffect(ZoomCenterClass zoomCenterClass, float startZoomFactor, float endZoomFactor)
 {
     _zoomCenterClass = zoomCenterClass;
     _startZoomFactor = startZoomFactor;
     _endZoomFactor   = endZoomFactor;
 }
 /// <summary>
 /// Constructor to explicitly set all animation values.
 /// </summary>
 /// <param name="zoomCenterClass">Defines which spot the animation will use as zoom spot.</param>
 /// <param name="startZoomFactor">Initial zoom factor. This value is normally near <c>1</c>.</param>
 /// <param name="endZoomFactor">End zoom factor. This value could be <see cref="KenBurnsEffects.KENBURNS_DEFAULT_ZOOM_FACTOR"/>.</param>
 public KenBurnsZoomEffect(ZoomCenterClass zoomCenterClass, float startZoomFactor, float endZoomFactor)
 {
   _zoomCenterClass = zoomCenterClass;
   _startZoomFactor = startZoomFactor;
   _endZoomFactor = endZoomFactor;
 }