public virtual void AnimateTransformTo(Vector2 position, float zoom, float speed, bool linear = true) {
   animateLinear = linear;
   animateEndPosition = position;
   animateEndZoom = zoom;
   animateSpeed = speed;
   animateTime = -1f;
   animateTransform = true;
}


public virtual void Update(GameTime gametime) {
   if (animateTransform) {
      if (animateTime == -1f) {
         animateStartPosition = m_position;
         animateStartZoom = m_zoom;
         animateTime = (float)gametime.TotalGameTime.TotalSeconds;
         OnAnimateTransformStart(this, new AnimateTransformEventArgs(animateTime, 0f, animateEndPosition, animateEndZoom, animateSpeed));
      }
      float time = (float)gametime.TotalGameTime.TotalSeconds;
      float progress = ((time - animateTime) / 100) * animateSpeed;
      if (progress >= 1f) progress = 1f;
      //if (animateLinear) LerpTransformLinear(animateStartPosition, animateEndPosition, animateStartZoom, animateEndZoom, progress);
      //else LerpTransformLinear(m_position, animateEndPosition, m_zoom, animateEndZoom, progress);
      if (animateLinear) LerpTransformLinear(out m_transform, new Vector2(m_viewport.Width, m_viewport.Height), animateStartPosition, animateEndPosition, animateStartZoom, animateEndZoom, progress);
      else LerpTransformLinear(out m_transform, new Vector2(m_viewport.Width, m_viewport.Height), m_position, animateEndPosition, m_zoom, animateEndZoom, progress);
      OnAnimateTransform(this, new AnimateTransformEventArgs(time, progress, animateEndPosition, animateEndZoom, animateSpeed));
      if (progress >= 1f) {
         animateTransform = false;
         OnAnimateTransformEnd(this, new AnimateTransformEventArgs(time, progress, animateEndPosition, animateEndZoom, animateSpeed));
      }
   }
}