private void IllustrationOriginalImage_OnManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
{
var renderedImageWidth = IllustrationOriginalImage.ActualWidth * GetZoomFactor();
var renderedImageHeight = IllustrationOriginalImage.ActualHeight * GetZoomFactor();
var containerWidth = IllustrationOriginalImageContainer.ActualWidth;
var containerHeight = IllustrationOriginalImageContainer.ActualHeight;
var pos = IllustrationOriginalImage.TransformToVisual(IllustrationOriginalImageContainer).TransformPoint(new Point(0, 0));
var sb = new Storyboard();
var animationDuration = TimeSpan.FromMilliseconds(200);
const string translateXProperty = nameof(CompositeTransform.TranslateX);
const string translateYProperty = nameof(CompositeTransform.TranslateY);
var xLowerBound = -(renderedImageWidth - containerWidth);
var yLowerBound = -(renderedImageHeight - containerHeight);
switch (pos.X)
{
case var x when x <xLowerBound && renderedImageWidth> containerWidth:
sb.Children.Add(IllustrationOriginalImageRenderTransform.CreateDoubleAnimation(translateXProperty, DoubleAnimationTemplate(xLowerBound - x)));
break;
case > 0 when renderedImageWidth > containerWidth:
sb.Children.Add(IllustrationOriginalImageRenderTransform.CreateDoubleAnimation(translateXProperty, DoubleAnimationTemplate(-pos.X)));
break;
}
switch (pos.Y)
{
case var y when y <yLowerBound && renderedImageHeight> containerHeight:
sb.Children.Add(IllustrationOriginalImageRenderTransform.CreateDoubleAnimation(translateYProperty, DoubleAnimationTemplate(yLowerBound - y)));
break;
case > 0 when renderedImageHeight > containerHeight:
sb.Children.Add(IllustrationOriginalImageRenderTransform.CreateDoubleAnimation(translateYProperty, DoubleAnimationTemplate(-pos.Y)));
break;
}
if (sb.Children.Any())
{
sb.Begin();
}
Func <DoubleAnimation> DoubleAnimationTemplate(double by) => () => new DoubleAnimation
{
Duration = animationDuration, EasingFunction = _easingFunction, By = @by
};
}
private void ResetImagePosition()
{
if (IllustrationOriginalImageRenderTransform.TranslateX != 0)
{
IllustrationOriginalImageRenderTransform.CreateDoubleAnimation(
nameof(CompositeTransform.TranslateX),
to: 0,
duration: TimeSpan.FromMilliseconds(100),
easingFunction: _easingFunction).BeginStoryboard();
}
if (IllustrationOriginalImageRenderTransform.TranslateY != 0)
{
IllustrationOriginalImageRenderTransform.CreateDoubleAnimation(
nameof(CompositeTransform.TranslateY),
to: 0,
duration: TimeSpan.FromMilliseconds(100),
easingFunction: _easingFunction).BeginStoryboard();
}
}
public void Zoom(double delta)
{
if (IllustrationOriginalImageRenderTransform.TranslateX != 0)
{
UIHelper.CreateStoryboard(IllustrationOriginalImageRenderTransform.CreateDoubleAnimation(nameof(CompositeTransform.TranslateX), () => new DoubleAnimation
{
To = 0,
Duration = TimeSpan.FromMilliseconds(100),
EasingFunction = _easingFunction
})).Begin();
}
if (IllustrationOriginalImageRenderTransform.TranslateY != 0)
{
UIHelper.CreateStoryboard(IllustrationOriginalImageRenderTransform.CreateDoubleAnimation(nameof(CompositeTransform.TranslateY), () => new DoubleAnimation
{
To = 0,
Duration = TimeSpan.FromMilliseconds(100),
EasingFunction = _easingFunction
})).Begin();
}
var factor = GetZoomFactor();
switch (delta)
{
case < 0 when factor > MinZoomFactor:
case > 0 when factor < MaxZoomFactor:
delta = (factor + delta) switch
{
> MaxZoomFactor => MaxZoomFactor - factor,
< MinZoomFactor => - (factor - MinZoomFactor),
_ => delta
};
IllustrationOriginalImageRenderTransform.ScaleX += delta;
IllustrationOriginalImageRenderTransform.ScaleY += delta;
break;
}
