silverlight 实现动画效果

1）前台代码如下

<UserControl x:Class="SilverlightApplication44.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">
    <UserControl.Resources>
        <!--改变Rectangle1的Width，Height以及SolidColorBrush1的Color-->
        <Storyboard x:Name="Storyboard1" RepeatBehavior="Forever">
            <DoubleAnimationUsingKeyFrames
                 BeginTime="00:00:00"
                 Storyboard.TargetName="Rectangle1"
                 Storyboard.TargetProperty="Width">
                <SplineDoubleKeyFrame KeyTime="00:00:02" Value="400"></SplineDoubleKeyFrame>
                <SplineDoubleKeyFrame KeyTime="00:00:06" Value="200"></SplineDoubleKeyFrame>
            </DoubleAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames
                 BeginTime="00:00:00"
                 Storyboard.TargetName="Rectangle1"
                 Storyboard.TargetProperty="Height">
                <SplineDoubleKeyFrame KeyTime="00:00:02" Value="400"></SplineDoubleKeyFrame>
                <SplineDoubleKeyFrame KeyTime="00:00:06" Value="200"></SplineDoubleKeyFrame>
            </DoubleAnimationUsingKeyFrames>
            <ColorAnimation 
                BeginTime="00:00:00"
                Storyboard.TargetName="SolidColorBrush1"
                Storyboard.TargetProperty="Color"
                Duration="00:00:04"
                From="Yellow"
                To="Black"></ColorAnimation>
        </Storyboard>
    </UserControl.Resources>
    <Grid x:Name="LayoutRoot" Background="White">
        <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center">
            <Rectangle Name="Rectangle1" Width="200" Height="200">
                <Rectangle.Fill>
                    <SolidColorBrush x:Name="SolidColorBrush1" Color="Yellow"></SolidColorBrush>
                </Rectangle.Fill>
            </Rectangle>
            <StackPanel Orientation="Horizontal">
                <Button Name="BeginButton" Content="Begin" Width="100" Height="24"></Button>
                <Button Name="StopButton" Content="Stop" Width="100" Height="24"></Button>
            </StackPanel>
        </StackPanel>
    </Grid>
</UserControl>

2）后台代码如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;


namespace SilverlightApplication44
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            Rectangle1.MouseEnter += new MouseEventHandler(Rectangle1_MouseEnter);
            Rectangle1.MouseLeave += new MouseEventHandler(Rectangle1_MouseLeave);
            BeginButton.Click += new RoutedEventHandler(BeginButton_Click);
            StopButton.Click += new RoutedEventHandler(StopButton_Click);
        }
        /// <summary>
        /// 继续
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void Rectangle1_MouseLeave(object sender,MouseEventArgs e)
        {
            Storyboard1.Resume();
        }
        /// <summary>
        /// 暂停
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void Rectangle1_MouseEnter(object sender,MouseEventArgs e)
        {
            Storyboard1.Pause();
        }
        /// <summary>
        /// 停止
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void StopButton_Click(object sender,RoutedEventArgs e)
        {
            Storyboard1.Stop();
        }
        /// <summary>
        /// 开始
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void BeginButton_Click(object sender,RoutedEventArgs e)
        {
            Storyboard1.Begin();
        }
    }
}