WPF - animating an EllipseGeometry in C # with a storyboard
I need to scale an EllipseGeometry in C # using a ScaleTransform, but that doesn't work. Here's the code:
XAML:
<Image x:Name="rock" Stretch="None">
<Image.Clip>
<EllipseGeometry x:Name="rockClip" RadiusX="100" RadiusY="100" Center="200,150">
<EllipseGeometry.Transform>
<ScaleTransform/>
</EllipseGeometry.Transform>
</EllipseGeometry>
</Image.Clip>
</Image>
FROM#:
DoubleAnimation scaleX = new DoubleAnimation();
scaleX.BeginTime = TimeSpan.FromMilliseconds(fromMills);
scaleX.Duration = new Duration(TimeSpan.FromMilliseconds(2000));
scaleX.From = 0.0;
scaleX.To = 1.0;
scaleX.SetValue(Storyboard.TargetProperty, rockClip);
scaleX.SetValue(Storyboard.TargetPropertyProperty, new PropertyPath("(EllipseGeometry.Transform).(ScaleTransform.ScaleX)"));
DoubleAnimation scaleY = new DoubleAnimation();
scaleY.BeginTime = TimeSpan.FromMilliseconds(fromMills);
scaleY.Duration = new Duration(TimeSpan.FromMilliseconds(2000));
scaleY.From = 0.0;
scaleY.To = 1.0;
scaleY.SetValue(Storyboard.TargetProperty, rockClip);
scaleY.SetValue(Storyboard.TargetPropertyProperty, new PropertyPath("(EllipseGeometry.Transform).(ScaleTransform.ScaleY)"));
Storyboard storyboard = new Storyboard();
storyboard.Children.Add(scaleX);
storyboard.Children.Add(scaleY);
storyboard.Completed += storyboard_Completed;
animation.Begin();
The storyboard_Completed event fires, but there is no animation in the EllipseGeometry.
Where is the problem?
I can only animate the EllipseGeometry this way:
DoubleAnimation scale = new DoubleAnimation();
scale.From = 0;
scale.To = 40;
scale.Duration = new Duration(TimeSpan.FromMilliseconds(5000));
rockClip.BeginAnimation(EllipseGeometry.RadiusXProperty, scale);
rockClip.BeginAnimation(EllipseGeometry.RadiusYProperty, scale);
I need to place this DoubleAnimation in the storyboard, but I don't know how.
Thank.
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1 answer
It works if you use an Image control (instead of a Geometry) as the target:
var scaleX = new DoubleAnimation();
scaleX.BeginTime = TimeSpan.FromMilliseconds(fromMills);
scaleX.Duration = TimeSpan.FromSeconds(2);
scaleX.From = 0.0;
scaleX.To = 1.0;
Storyboard.SetTarget(scaleX, rock);
Storyboard.SetTargetProperty(scaleX, new PropertyPath("Clip.Transform.ScaleX"));
var scaleY = new DoubleAnimation();
scaleY.BeginTime = TimeSpan.FromMilliseconds(fromMills);
scaleY.Duration = TimeSpan.FromSeconds(2);
scaleY.From = 0.0;
scaleY.To = 1.0;
Storyboard.SetTarget(scaleY, rock);
Storyboard.SetTargetProperty(scaleY, new PropertyPath("Clip.Transform.ScaleY"));
var storyboard = new Storyboard();
storyboard.Children.Add(scaleX);
storyboard.Children.Add(scaleY);
storyboard.Begin();
However the simplest way might be to name ScaleTransform
<EllipseGeometry.Transform>
<ScaleTransform x:Name="scale"/>
</EllipseGeometry.Transform>
and animate like this:
var scaleAnimation = new DoubleAnimation
{
BeginTime = TimeSpan.FromMilliseconds(fromMills),
Duration = TimeSpan.FromSeconds(2),
From = 0.0,
To = 1.0
};
scale.BeginAnimation(ScaleTransform.ScaleXProperty, scaleAnimation);
scale.BeginAnimation(ScaleTransform.ScaleYProperty, scaleAnimation);
EDIT: To animate properties RadiusX
and RadiusY
using storyboard, you can write this:
var radiusXAnimation = new DoubleAnimation();
radiusXAnimation.BeginTime = TimeSpan.FromMilliseconds(fromMills);
radiusXAnimation.Duration = TimeSpan.FromSeconds(2);
radiusXAnimation.From = 0;
radiusXAnimation.To = 100;
Storyboard.SetTarget(radiusXAnimation, rock);
Storyboard.SetTargetProperty(radiusXAnimation, new PropertyPath("Clip.RadiusX"));
var radiusYAnimation = new DoubleAnimation();
radiusYAnimation.BeginTime = TimeSpan.FromMilliseconds(fromMills);
radiusYAnimation.Duration = TimeSpan.FromSeconds(2);
radiusYAnimation.From = 0;
radiusYAnimation.To = 100;
Storyboard.SetTarget(radiusYAnimation, rock);
Storyboard.SetTargetProperty(radiusYAnimation, new PropertyPath("Clip.RadiusY"));
var storyboard = new Storyboard();
storyboard.Children.Add(radiusXAnimation);
storyboard.Children.Add(radiusYAnimation);
storyboard.Begin();
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