private static void CreateParallax(UIElement parallaxElement, ScrollViewer scroller, double horizontalMultiplier, double verticalMultiplier)
{
if ((parallaxElement == null) || (scroller == null))
{
return;
}
CompositionPropertySet scrollerViewerManipulation = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(scroller);
var scrollPropSet = scrollerViewerManipulation.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var parallax = ExpressionFunctions.Vector3((float)horizontalMultiplier * scrollPropSet.Translation.X, (float)verticalMultiplier * scrollPropSet.Translation.Y, 0f);
var expression = ExpressionFunctions.CreateTranslation(parallax);
Visual visual = ElementCompositionPreview.GetElementVisual(parallaxElement);
visual.StartAnimation("TransformMatrix", expression);
}
