private void IllustrationOriginalImage_OnManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
{
var(deltaX, deltaY) = (e.Delta.Translation.X, e.Delta.Translation.Y);
if (GetZoomFactor() > 1)
{
var renderedImageWidth = IllustrationOriginalImage.ActualWidth * GetZoomFactor();
var renderedImageHeight = IllustrationOriginalImage.ActualHeight * GetZoomFactor();
var containerWidth = IllustrationOriginalImageContainer.ActualWidth;
var containerHeight = IllustrationOriginalImageContainer.ActualHeight;
var imagePos = IllustrationOriginalImage.TransformToVisual(IllustrationOriginalImageContainer).TransformPoint(new Point(0, 0));
if (renderedImageWidth > containerWidth)
{
switch (deltaX)
{
case < 0 when imagePos.X > -(renderedImageWidth - containerWidth):
case > 0 when imagePos.X < 0:
IllustrationOriginalImageRenderTransform.TranslateX += deltaX;
break;
}
}
if (renderedImageHeight > containerHeight)
{
switch (deltaY)
{
case < 0 when imagePos.Y > -(renderedImageHeight - containerHeight):
case > 0 when imagePos.Y < 0:
IllustrationOriginalImageRenderTransform.TranslateY += deltaY;
break;
}
}
}
}
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
};
}