private void _createAnimation(UIElement attachedElement, CompositionObject compositionObject)
{
_offsetAnimation = Window.Current.Compositor.CreateExpressionAnimation(OFFSET_ANIMATION_EXPRESSION);
_offsetAnimation.SetReferenceParameter(OFFSET_ANIMATION_EXPRESSION_REFERENCE_PROPS, _offsetProps);
var pointerProps = ElementCompositionPreview.GetPointerPositionPropertySet(attachedElement);
_offsetAnimation.SetReferenceParameter(OFFSET_ANIMATION_EXPRESSION_REFERENCE_POINTER, pointerProps);
compositionObject.StartAnimation("Offset", _offsetAnimation);
}
protected override void OnConnected(UIElement targetElement)
{
if (targetElement == null)
{
return;
}
Compositor compositor = Window.Current.Compositor;
// Create SpotLight and set its properties
SpotLight spotLight = compositor.CreateSpotLight();
spotLight.InnerConeColor = Colors.FloralWhite;
spotLight.OuterConeColor = Colors.FloralWhite;
spotLight.InnerConeAngleInDegrees = 0f;
spotLight.InnerConeIntensity = 4;
//spotLight.OuterConeAngleInDegrees = 3f;
spotLight.ConstantAttenuation = 1f;
spotLight.LinearAttenuation = 0.253f;
spotLight.QuadraticAttenuation = 0.58f;
spotLight.Offset = new Vector3(0, 0, 0);
// Associate CompositionLight with XamlLight
this.CompositionLight = spotLight;
// Define resting position Animation
Vector3 restingPosition = new Vector3(200, 200, 400);
CubicBezierEasingFunction cbEasing = compositor.CreateCubicBezierEasingFunction(new Vector2(0.3f, 0.7f), new Vector2(0.9f, 0.5f));
_offsetAnimation = compositor.CreateVector3KeyFrameAnimation();
_offsetAnimation.InsertKeyFrame(1, restingPosition, cbEasing);
_offsetAnimation.Duration = TimeSpan.FromSeconds(0.5f);
//spotLight.Offset = restingPosition;
// Define expression animation that relates light's offset to pointer position
CompositionPropertySet hoverPosition = ElementCompositionPreview.GetPointerPositionPropertySet(targetElement);
_lightPositionExpression = compositor.CreateExpressionAnimation("Vector3(hover.Position.X, hover.Position.Y, height)");
_lightPositionExpression.SetReferenceParameter("hover", hoverPosition);
_lightPositionExpression.SetScalarParameter("height", 150f);
// Configure pointer entered/ exited events
targetElement.PointerMoved += TargetElement_PointerMoved;
targetElement.PointerExited += TargetElement_PointerExited;
// Add UIElement to the Light's Targets
HoverLight.AddTargetElement(GetId(), targetElement);
//MoveToRestingPosition();
}
private void OnTilePointerPressed(object sender, PointerRoutedEventArgs e)
{
var tileGrid = (Grid)sender;
var colorElement = (Rectangle)tileGrid.FindName("ColorElement");
// Set the CenterPoint of the backing Visual, so the rotation axis will defined from the middle.
colorElement.Visual().CenterPoint = new Vector3(tileGrid.RenderSize.ToVector2() / 2, 0.0f);
// Calculate distance from corner of quadrant to Center
_center = colorElement.Visual().CenterPoint;
var xSquared = Math.Pow(tileGrid.ActualWidth / 2, 2);
var ySquared = Math.Pow(tileGrid.ActualHeight / 2, 2);
_distanceToCenter = (float)Math.Sqrt(xSquared + ySquared);
// || DEFINE THE EXPRESSION FOR THE ROTATION ANGLE ||
// We calculate the Rotation Angle such that it increases from 0 to 3 as the cursor position moves away from the center.
// Combined with animating the Rotation Axis, the image is "push down" on the point at which the cursor is located.
var pointerPositionProperties = ElementCompositionPreview.GetPointerPositionPropertySet(tileGrid);
var pointerPosition = pointerPositionProperties.GetSpecializedReference <PointerPositionPropertySetReferenceNode>().Position;
var angleExpressionNode = 3 * (EF.Clamp(EF.Distance(_center, pointerPosition), 0, _distanceToCenter) % _distanceToCenter / _distanceToCenter);
var rotationAngleAnimation = _compositor.CreateScalarKeyFrameAnimation();
rotationAngleAnimation.Duration = TimeSpan.FromMilliseconds(600);
rotationAngleAnimation.InsertExpressionKeyFrame(0.4f, angleExpressionNode);
rotationAngleAnimation.InsertKeyFrame(1.0f, 0.0f);
colorElement.Visual().StartAnimation("RotationAngleInDegrees", rotationAngleAnimation);
// || DEFINE THE EXPRESSION FOR THE ROTATION AXIS ||
// The RotationAxis will be defined as the axis perpendicular to vector position of the hover pointer (vector from center to hover position).
// The axis is a vector calculated by first converting the pointer position into the coordinate space where the center point (0, 0) is in the middle.
// The perpendicular axis is then calculated by transposing the cartesian x, y components and negating one (e.g. Vector3(-y,x,0) )
var axisAngleExpressionNode = EF.Floor((pointerPosition.X - _center.X) * EF.Conditional(pointerPosition.X == _center.X, 0, 1));
var rotationAxisAnimation = _compositor.CreateScalarKeyFrameAnimation();
rotationAxisAnimation.Duration = TimeSpan.FromMilliseconds(600);
rotationAxisAnimation.InsertExpressionKeyFrame(0.4f, axisAngleExpressionNode);
rotationAxisAnimation.InsertKeyFrame(1.0f, 0.0f);
colorElement.Visual().StartAnimation("RotationAxis.Y", rotationAxisAnimation);
}
// via the composition api, which doesn't seem to work.
void reportPointerPositionRelativeTo_canvas(object sender, PointerRoutedEventArgs args)
{
var rectPointerState = ElementCompositionPreview.GetPointerPositionPropertySet(canvas);
switch (rectPointerState.TryGetVector3("Position", out var val))
{
case CompositionGetValueStatus.Succeeded:
Debug.WriteLine(val);
break;
case CompositionGetValueStatus.NotFound:
Debug.WriteLine("Nothing");
break;
case CompositionGetValueStatus.TypeMismatch:
Debug.WriteLine("type mismatch");
break;
}
}
private void TiltUIElement()
{
// Grab the backing Visual for the UIElement image
_tiltVisual = ElementCompositionPreview.GetElementVisual(tiltImage);
// Set the CenterPoint of the backing Visual, so the rotation axis will defined from the middle
_tiltVisual.CenterPoint = new Vector3((float)tiltImage.Width / 2, (float)tiltImage.Height / 2, 0f);
// Grab the PropertySet containing the hover pointer data that will be used to drive the rotations
// Note: We have a second UIElement we will grab the pointer data against and the other we will animate
_hoverPositionPropertySet = ElementCompositionPreview.GetPointerPositionPropertySet(HitTestRect);
// Calculate distance from corner of quadrant to Center
var center = new Vector3((float)tiltImage.Width / 2, (float)tiltImage.Height / 2, 0);
var xSquared = Math.Pow(tiltImage.Width / 2, 2);
var ySquared = Math.Pow(tiltImage.Height / 2, 2);
var distanceToCenter = (float)Math.Sqrt(xSquared + ySquared);
// || DEFINE THE EXPRESSION FOR THE ROTATION ANGLE ||
// We calculate the Rotation Angle such that it increases from 0 to 35 as the cursor position moves away from the center.
// Combined with animating the Rotation Axis, the image is "push down" on the point at which the cursor is located.
// Note: We special case when the hover position is (0,0,0) as this is the starting hover position and and we want the image to be flat (rotationAngle = 0) at startup.
var hoverPosition = _hoverPositionPropertySet.GetSpecializedReference <PointerPositionPropertySetReferenceNode>().Position;
var angleExpressionNode =
EF.Conditional(
hoverPosition == new Vector3(0, 0, 0),
ExpressionValues.CurrentValue.CreateScalarCurrentValue(),
35 * ((EF.Clamp(EF.Distance(center, hoverPosition), 0, distanceToCenter) % distanceToCenter) / distanceToCenter));
_tiltVisual.StartAnimation("RotationAngleInDegrees", angleExpressionNode);
// || DEFINE THE EXPRESSION FOR THE ROTATION AXIS ||
// The RotationAxis will be defined as the axis perpendicular to vector position of the hover pointer (vector from center to hover position).
// The axis is a vector calculated by first converting the pointer position into the coordinate space where the center point (0, 0) is in the middle.
// The perpendicular axis is then calculated by transposing the cartesian x, y components and negating one (e.g. Vector3(-y,x,0) )
var axisAngleExpressionNode = EF.Vector3(
-(hoverPosition.Y - center.Y) * EF.Conditional(hoverPosition.Y == center.Y, 0, 1),
(hoverPosition.X - center.X) * EF.Conditional(hoverPosition.X == center.X, 0, 1),
0);
_tiltVisual.StartAnimation("RotationAxis", axisAngleExpressionNode);
}
private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
var container = Compositor.CreateContainerVisual();
var colors = typeof(Colors).GetProperties(BindingFlags.Public | BindingFlags.Static | BindingFlags.GetProperty)
.Select(c => c.GetValue(null))
.OfType <Color>()
.ToList();
ExpressionAnimation exp = null;
for (int i = 1; i < 20; i++)
{
var c = colors[i % colors.Count];
var t = new TranslationFastVisual(
compositor: Compositor,
size: new Vector2(50, 50),
offset: Vector3.Zero,
color: c,
dampingRatio: 0.3f);
if (exp == null)
{
var prop = ElementCompositionPreview.GetPointerPositionPropertySet(this);
exp = Compositor.CreateExpressionAnimation("Vector3(prop.Position.X, prop.Position.Y, 0f)");
exp.SetReferenceParameter("prop", prop);
}
t.Translation.StartExpression(exp);
exp = Compositor.CreateExpressionAnimation("prop.Value");
exp.SetReferenceParameter("prop", t.Translation.Properties);
translationVisuals.Add(t);
container.Children.InsertAtBottom(t.Visual);
}
ElementCompositionPreview.SetElementChildVisual(this, container);
}
private async void OnPageLoaded(object sender, RoutedEventArgs e)
{
_compositor = Window.Current.Compositor;
_generator = _compositor.CreateCompositionGenerator();
var gridSize = new Vector2((float)RootGrid.ActualWidth, (float)RootGrid.ActualHeight);
var anim = _compositor.CreatePathKeyFrameAnimation();
_rootVisual = _compositor.CreateSpriteVisual();
_rootVisual.Size = gridSize;
// Create the surface brush from the image
var imageSurface = await _generator.CreateImageSurfaceAsync(
new Uri("ms-appx:///Assets/Images/Cat.png"),
new Size(400, 400),
ImageSurfaceOptions.Default);
var imageBrush = _compositor.CreateSurfaceBrush(imageSurface);
// Create the clipped visuals
for (var i = 0; i < 145; i++)
{
var visual = _compositor.CreateSpriteVisual();
visual.Offset = new Vector3(400, 400, 0);
visual.Size = new Vector2(400, 400);
visual.Brush = imageBrush;
visual.AnchorPoint = new Vector2(0.5f);
var radius = 290 - (i * 2);
// Create the GeometricClip for this visual
var clipGeometry = CanvasGeometry.CreateCircle(null, new Vector2(200, 200), radius);
visual.Clip = _compositor.CreateGeometricClip(clipGeometry);
_rootVisual.Children.InsertAtTop(visual);
_visuals.Add(visual);
}
// Display the rootVisual
ElementCompositionPreview.SetElementChildVisual(RootGrid, _rootVisual);
// Reverse the visuals list so that the items in the list are now sorted
// in z-order from top to bottom
_visuals.Reverse();
// The topmost visual would track the pointer position
_dragVisual = _visuals.First();
// Get the CompositionPropertySet which tracks the pointer position on the RootGrid
_pointerTrackerSet = ElementCompositionPreview.GetPointerPositionPropertySet(RootGrid);
// Animate the topmost visual so that it tracks and follows the pointer position
_pointerTrackerAnimation = _compositor.GenerateVector3KeyFrameAnimation()
.HavingDuration(PointerTrackerAnimationDuration)
.RepeatsForever();
_pointerTrackerAnimation.InsertExpressionKeyFrame(0f, c => new VisualTarget().Offset);
_pointerTrackerAnimation.InsertExpressionKeyFrame(
1f,
c => c.Lerp(new VisualTarget().Offset, _pointerTrackerSet.Get <Vector3>("Position"), DefaultLerpAmount),
_compositor.CreateEaseOutQuinticEasingFunction());
// Animate the remaining visuals in such a way that each visual tracks and follows the
// position of the visual above it.
var prevChild = _dragVisual;
foreach (var child in _visuals.Skip(1))
{
var offsetAnimation = _compositor.GenerateVector3KeyFrameAnimation()
.HavingDuration(ChildOffsetAnimationDuration)
.RepeatsForever();
offsetAnimation.InsertExpressionKeyFrame(0f, c => new VisualTarget().Offset);
offsetAnimation.InsertExpressionKeyFrame(
1f,
c => c.Lerp(new VisualTarget().Offset, prevChild.Offset, DefaultLerpAmount),
_compositor.CreateEaseOutQuinticEasingFunction());
child.StartAnimation(() => child.Offset, offsetAnimation);
prevChild = child;
}
}
public static CompositionPropertySet GetPointerPositionProperties(this UIElement element) => ElementCompositionPreview.GetPointerPositionPropertySet(element);
private void Page_Loaded(object sender, RoutedEventArgs e)
{
// create the compositor
_compositor = ElementCompositionPreview.GetElementVisual(this).Compositor;
// create what captures the pointer position
_hoverPositionPropertySet = ElementCompositionPreview.GetPointerPositionPropertySet(r2);
// create the two visuals
_vis = _compositor.CreateSpriteVisual();
_pulseVis = _compositor.CreateSpriteVisual();
// create the main brush with warm colors
_mainBrush = _compositor.CreateRadialGradientBrush();
_mainBrush.EllipseCenter = new Vector2(.5f, .5f);
_mainBrush.EllipseRadius = new Vector2(.5f, .5f);
_MBGradientStop1 = _compositor.CreateColorGradientStop();
_MBGradientStop1.Offset = 0;
_MBGradientStop1.Color = _warmColor1;
_MBGradientStop2 = _compositor.CreateColorGradientStop();
_MBGradientStop2.Offset = .1f;
_MBGradientStop2.Color = _warmColor2;
_MBGradientStop3 = _compositor.CreateColorGradientStop();
_MBGradientStop3.Offset = 1;
_MBGradientStop3.Color = _warmColor3;
_mainBrush.ColorStops.Add(_MBGradientStop1);
_mainBrush.ColorStops.Add(_MBGradientStop2);
_mainBrush.ColorStops.Add(_MBGradientStop3);
// create the brush for the pulse visual
_pulseBrush = _compositor.CreateRadialGradientBrush();
_pulseBrush.EllipseCenter = new Vector2(.5f, .5f);
_pulseBrush.EllipseRadius = new Vector2(.5f, .5f);
_PBGradientStop1 = _compositor.CreateColorGradientStop();
_PBGradientStop1.Offset = 0;
_PBGradientStop1.Color = _innerPulseColor;
_PBGradientStop2 = _compositor.CreateColorGradientStop();
_PBGradientStop2.Offset = 1;
_PBGradientStop2.Color = _innerPulseColor;
_pulseBrush.ColorStops.Add(_PBGradientStop1);
_pulseBrush.ColorStops.Add(_PBGradientStop2);
// finish setting properties of the first visual
_vis.Size = new Vector2(300, 300);
_vis.Offset = new Vector3(((float)r2.ActualWidth / 2), ((float)r2.ActualHeight / 2), 0);
_vis.AnchorPoint = new Vector2(.5f, .5f);
_vis.Brush = _mainBrush;
// finish setting properties of the pulsing visual
_pulseVis.Size = new Vector2(500, 500);
_pulseVis.Offset = new Vector3(((float)r1.ActualWidth / 2), ((float)r1.ActualHeight / 2), 0);
_pulseVis.AnchorPoint = new Vector2(.5f, .5f);
_pulseVis.Brush = _pulseBrush;
// create the clip that makes the visuals circular
CompositionGeometricClip gClip = _compositor.CreateGeometricClip();
CompositionEllipseGeometry circle = _compositor.CreateEllipseGeometry();
circle.Radius = new Vector2(_vis.Size.X / 2, _vis.Size.Y / 2);
circle.Center = new Vector2(_vis.Size.X / 2, _vis.Size.Y / 2);
gClip.Geometry = circle;
_vis.Clip = gClip;
CompositionGeometricClip gClip2 = _compositor.CreateGeometricClip();
CompositionEllipseGeometry circle2 = _compositor.CreateEllipseGeometry();
circle2.Radius = new Vector2(_pulseVis.Size.X / 2, _pulseVis.Size.Y / 2);
circle2.Center = new Vector2(_pulseVis.Size.X / 2, _pulseVis.Size.Y / 2);
gClip2.Geometry = circle2;
_pulseVis.Clip = gClip2;
// set the pointer
my_pointer = new Vector3(((float)r1.ActualWidth / 2), ((float)r1.ActualHeight / 2), 0);
// set the visuals in the tree
ElementCompositionPreview.SetElementChildVisual(r2, _vis);
ElementCompositionPreview.SetElementChildVisual(r1, _pulseVis);
// ellipse center follows mouse
_ellipseCenterAnim = _compositor.CreateExpressionAnimation("Vector2(p.Position.X / 500.0f, p.Position.Y / 500.0f)");
_ellipseCenterAnim.SetReferenceParameter("p", _hoverPositionPropertySet);
_mainBrush.StartAnimation("EllipseCenter", _ellipseCenterAnim);
// second stop is animated for "pulsing" effect within the first visual that runs constantly
_offsetAnim = _compositor.CreateScalarKeyFrameAnimation();
_offsetAnim.InsertKeyFrame(0, 0);
_offsetAnim.InsertKeyFrame(1f, 1f);
_offsetAnim.Duration = TimeSpan.FromSeconds(2);
_offsetAnim.IterationCount = 50;
_MBGradientStop2.StartAnimation("Offset", _offsetAnim);
// set up the animation for the backing pulse visual
// animate the color
_pulseColorAnim = _compositor.CreateColorKeyFrameAnimation();
_pulseColorAnim.InsertKeyFrame(0, _innerPulseColor);
_pulseColorAnim.InsertKeyFrame(.99f, _outerPulseColor);
_pulseColorAnim.InsertKeyFrame(1, _innerPulseColor);
_pulseColorAnim.Duration = TimeSpan.FromSeconds(1);
_pulseColorAnim.IterationBehavior = AnimationIterationBehavior.Forever;
_PBGradientStop1.StartAnimation("Color", _pulseColorAnim);
// animate offset of first stop
_pulseStop1OffsetAnim = _compositor.CreateScalarKeyFrameAnimation();
_pulseStop1OffsetAnim.InsertKeyFrame(0, 0);
_pulseStop1OffsetAnim.InsertKeyFrame(1f, 1f);
_pulseStop1OffsetAnim.Duration = TimeSpan.FromSeconds(1);
_pulseStop1OffsetAnim.IterationBehavior = AnimationIterationBehavior.Forever;
_PBGradientStop1.StartAnimation("Offset", _pulseStop1OffsetAnim);
// animate offset of second stop
_pulseStop2OffsetAnim = _compositor.CreateScalarKeyFrameAnimation();
_pulseStop2OffsetAnim.InsertKeyFrame(0, 0);
_pulseStop2OffsetAnim.InsertKeyFrame(1f, 1f);
_pulseStop2OffsetAnim.Duration = TimeSpan.FromSeconds(1);
_pulseStop2OffsetAnim.IterationBehavior = AnimationIterationBehavior.Forever;
_pulseStop2OffsetAnim.DelayTime = TimeSpan.FromSeconds(.25f);
_PBGradientStop2.StartAnimation("Offset", _pulseStop2OffsetAnim);
_pulseScaleAnim = _compositor.CreateVector3KeyFrameAnimation();
_pulseScaleAnim.InsertKeyFrame(0, Vector3.Zero);
_pulseScaleAnim.InsertKeyFrame(1, Vector3.One);
_pulseScaleAnim.Duration = TimeSpan.FromSeconds(1);
_pulseScaleAnim.IterationBehavior = AnimationIterationBehavior.Forever;
_pulseVis.StartAnimation("Scale", _pulseScaleAnim);
}