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How to: Animate the Color or Opacity of a SolidColorBrush

This example shows how to animate the Color and Opacity of a SolidColorBrush.

The following example uses three animations to animate the Color and Opacity of a SolidColorBrush.

  • The first animation, a ColorAnimation, changes the brush's color to Gray when the mouse enters the rectangle.

  • The next animation, another ColorAnimation, changes the brush's color to Orange when the mouse leaves the rectangle.

  • The final animation, a DoubleAnimation, changes the brush's opacity to 0.0 when the left mouse button is pressed.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Input;

namespace Microsoft.Samples.Animation
    /// <summary> 
    /// This example shows how to animate the Opacity and Color  
    /// properties of a SolidColorBrush. 
    /// </summary> 
    public class SolidColorBrushExample : Page

        public SolidColorBrushExample()
            Title = "SolidColorBrush Animation Example";
            Background = Brushes.White;

            // Create a NameScope for the page so 
            // that Storyboards can be used.
            NameScope.SetNameScope(this, new NameScope());

            // Create a Rectangle.
            Rectangle aRectangle = new Rectangle();
            aRectangle.Width = 100;
            aRectangle.Height = 100;

            // Create a SolidColorBrush to paint 
            // the rectangle's fill. The Opacity 
            // and Color properties of the brush 
            // will be animated.
            SolidColorBrush myAnimatedBrush = new SolidColorBrush();
            myAnimatedBrush.Color = Colors.Orange;
            aRectangle.Fill = myAnimatedBrush;

            // Register the brush's name with the page 
            // so that it can be targeted by storyboards. 
            this.RegisterName("MyAnimatedBrush", myAnimatedBrush);

            // Animate the brush's color to gray when 
            // the mouse enters the rectangle. 
            ColorAnimation mouseEnterColorAnimation = new ColorAnimation();
            mouseEnterColorAnimation.To = Colors.Gray;
            mouseEnterColorAnimation.Duration = TimeSpan.FromSeconds(1);
            Storyboard.SetTargetName(mouseEnterColorAnimation, "MyAnimatedBrush");
                mouseEnterColorAnimation, new PropertyPath(SolidColorBrush.ColorProperty));
            Storyboard mouseEnterStoryboard = new Storyboard();
            aRectangle.MouseEnter += delegate(object sender, MouseEventArgs e)

            // Animate the brush's color to orange when 
            // the mouse leaves the rectangle. 
            ColorAnimation mouseLeaveColorAnimation = new ColorAnimation();
            mouseLeaveColorAnimation.To = Colors.Orange;
            mouseLeaveColorAnimation.Duration = TimeSpan.FromSeconds(1);
            Storyboard.SetTargetName(mouseLeaveColorAnimation, "MyAnimatedBrush");
                mouseLeaveColorAnimation, new PropertyPath(SolidColorBrush.ColorProperty));
            Storyboard mouseLeaveStoryboard = new Storyboard();
            aRectangle.MouseLeave += delegate(object sender, MouseEventArgs e)

            // Animate the brush's opacity to 0 and back when 
            // the left mouse button is pressed over the rectangle. 
            DoubleAnimation opacityAnimation = new DoubleAnimation();
            opacityAnimation.To = 0.0;
            opacityAnimation.Duration = TimeSpan.FromSeconds(0.5);
            opacityAnimation.AutoReverse = true;
            Storyboard.SetTargetName(opacityAnimation, "MyAnimatedBrush");
                opacityAnimation, new PropertyPath(SolidColorBrush.OpacityProperty));
            Storyboard mouseLeftButtonDownStoryboard = new Storyboard();
            aRectangle.MouseLeftButtonDown += delegate(object sender, MouseButtonEventArgs e)

            StackPanel mainPanel = new StackPanel();
            mainPanel.Margin = new Thickness(20);
            Content = mainPanel;

<!-- SolidColorBrushExample.xaml
     This example shows how to animate the Opacity and Color 
     properties of a SolidColorBrush.-->
  Title="SolidColorBrush Animation Example"
  <StackPanel Margin="20">

    <!-- The Opacity and Color of the SolidColorBrush 
         used to fill this rectangle is animated. -->
    <Rectangle Width="100" Height="100">
        <SolidColorBrush x:Name="MyAnimatedBrush" Color="Orange" />

        <!-- Animates the brush's color to gray
             When the mouse enters the rectangle. -->
        <EventTrigger RoutedEvent="Rectangle.MouseEnter">
                To="Gray" Duration="0:0:1" />

        <!-- Animates the brush's color to orange
             when the mouse leaves the rectangle. -->
        <EventTrigger RoutedEvent="Rectangle.MouseLeave">
                To="Orange" Duration="0:0:1" />

        <!-- Animates the brush's opacity when the
             left mouse button is pressed over the rectangle. -->
        <EventTrigger RoutedEvent="Rectangle.MouseLeftButtonDown">
                To="0.0" Duration="0:0:0.5" AutoReverse="True" />

For a more complete sample, which shows how to animate different types of brushes, see the Brushes Sample. For more information about animation, see the Animation Overview.

For consistency with other animation examples, the code versions of this example use a Storyboard object to apply their animations. However, when applying a single animation in code, it's simpler to use the BeginAnimation method instead of using a Storyboard. For an example, see How to: Animate a Property Without Using a Storyboard.