private async void AnimateImage(Func <FrameworkElement> image, double minTime, double maxTime) //, Func<double> imgWidth
{
await Task.Yield();
var minWidth = 300;
var maxWidth = 2560;
var width = ActualWidth;
var percentage = (width - minWidth) / (maxWidth - minWidth);
var myTime = maxTime - percentage * (maxTime - minTime);
while (true)
{
var imageElement = image();
double w = imageElement.Width;
var animation = new Storyboard();
var duration = new Duration(TimeSpan.FromMilliseconds(1000 * (16 + _random.Next() % 9)));
var resname = $"animation{_animationId++ % 1000000}";
Resources.Add(resname, animation);
var transGroup = new TransformGroup();
imageElement.RenderTransform = transGroup;
var rotateTransform = new RotateTransform();
transGroup.Children.Add(rotateTransform);
animation.Children.Add(AnimateDouble(rotateTransform, nameof(RotateTransform.Angle), 0, _random.Next(-270, 270), duration));
if (_random.Next() % 2 == 0)
{
transGroup.Children.Add(new ScaleTransform {
ScaleX = -1, ScaleY = 1
});
}
var moveTransform = new TranslateTransform
{
X = _random.Next((int)(-w / 2), (int)(ActualWidth + w / 2))
};
transGroup.Children.Add(moveTransform);
animation.Children.Add(AnimateDouble(moveTransform, "Y", -w, ActualHeight + w, duration));
RootCanvas.Children.Add(imageElement);
animation.Begin();
EventHandler <object> completion = null;
completion = (o, e) =>
{
animation.Completed -= completion;
Resources.Remove(resname);
RootCanvas.Children.Remove(imageElement);
};
animation.Completed += completion;
await Task.Delay((int)(myTime * 1000));
}
// ReSharper disable once FunctionNeverReturns
}
private DoubleAnimation AnimateDouble(DependencyObject target, string property, double?fromValue, double?toValue, Duration duration)
{
var animation = new DoubleAnimation
{
From = fromValue,
To = toValue,
Duration = duration,
};
Storyboard.SetTarget(animation, target);
Storyboard.SetTargetProperty(animation, property);
return(animation);
}