稳扎稳打Silverlight(37) - 3.0动画之Easing（缓动效果）

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[align=center]稳扎稳打Silverlight(37) - 3.0动画之Easing（缓动效果）[/align]

作者：webabcd

介绍
Silverlight 3.0 动画的缓动效果：

Easing 可以与 Storyboard 结合实现动画的缓动效果
Silverlight 3 内置 11 种缓动效果：分别为BackEase, BounceEase, CircleEase, CubicEase, ElasticEase, ExponentialEase, PowerEase, QuadraticEase, QuarticEase, QuinticEase, SineEase
各个缓动类都继承自 EasingFunctionBase，除了 EasingFunctionBase 提供的功能外，各个缓动类可能还会有各自的属性（懒的写了，查文档吧）
EasingFunctionBase 有一个用于设置缓动模式的枚举类型属性 EasingMode （EasingMode.EaseOut(默认值), EasingMode.EaseIn, EasingMode.EaseInOut）

在线DEMO
/article/4589629.html

示例
1、Silverlight 3.0 内置的 11 种缓动效果的 Demo
Easing.xaml

<navigation:Page x:Class="Silverlight30.Animation.Easing"
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"
xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
d:DesignWidth="640" d:DesignHeight="480"
Title="Easing Page">
<Grid x:Name="LayoutRoot">
<StackPanel Orientation="Horizontal" HorizontalAlignment="Left">

<!--用于显示各种 Easing 的图例列表-->
<StackPanel Margin="10">
<ListBox x:Name="lstEasing">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Margin="1">
<TextBlock Text="{Binding EasingName}" />
<Image Source="{Binding PicAddress}" Width="300" Height="50" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</StackPanel>

<StackPanel Margin="10, 200">

<!--分别用 3 种动画来演示各类 Easing-->
<ComboBox x:Name="cboTransform" Margin="5">
<ComboBoxItem Content="Translate" IsSelected="True" />
<ComboBoxItem Content="Rotate" />
<ComboBoxItem Content="Scale" />
</ComboBox>

<!--用各种 EasingMode 分别做演示-->
<ComboBox x:Name="cboEasingMode" Margin="5">
<ComboBoxItem Content="EaseOut" IsSelected="True" />
<ComboBoxItem Content="EaseIn" />
<ComboBoxItem Content="EaseInOut" />
</ComboBox>

<Button x:Name="btnShow" Content="演示" Click="btnShow_Click" Margin="5" />

<!--用于做动画演示的矩形-->
<Rectangle x:Name="rect" Fill="Blue" Width="200" Height="40" Margin="5" RenderTransformOrigin="0.5,0.5">
<Rectangle.RenderTransform>
<TransformGroup>
<TranslateTransform x:Name="tt" X="0" Y="0" />
<RotateTransform x:Name="rt" Angle="0" />
<ScaleTransform x:Name="st" ScaleX="1" ScaleY="1" />
</TransformGroup>
</Rectangle.RenderTransform>
</Rectangle>

</StackPanel>
</StackPanel>
</Grid>
</navigation:Page>

Easing.xaml.cs

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;
using System.Windows.Navigation;

using Silverlight30.Model;
using System.Xml.Linq;

namespace Silverlight30.Animation

2、自定义缓动效果的 Demo
MyCustomEasing.cs

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace Silverlight30.Animation

CustomEasing.xaml

<navigation:Page x:Class="Silverlight30.Animation.CustomEasing"
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"
xmlns:custom="clr-namespace:Silverlight30.Animation"
xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
d:DesignWidth="640" d:DesignHeight="480"
Title="CustomEasing Page">
<Grid x:Name="LayoutRoot">
<StackPanel>

<StackPanel.Resources>
<Storyboard x:Name="ani">
<DoubleAnimation
Storyboard.TargetName="tt"
Storyboard.TargetProperty="Y"
From="0"
To="200"
Duration="00:00:03"
>
<DoubleAnimation.EasingFunction>
<!--使用自定义的缓动效果-->
<custom:MyCustomEasing EasingMode="EaseOut" />
</DoubleAnimation.EasingFunction>
</DoubleAnimation>
</Storyboard>
</StackPanel.Resources>

<Button x:Name="btnShow" Content="演示" Margin="5" Click="btnShow_Click" />

<Rectangle x:Name="rect" Fill="Blue" Width="200" Height="40" Margin="5" RenderTransformOrigin="0.5,0.5">
<Rectangle.RenderTransform>
<TransformGroup>
<TranslateTransform x:Name="tt" X="0" Y="0" />
</TransformGroup>
</Rectangle.RenderTransform>
</Rectangle>

</StackPanel>
</Grid>
</navigation:Page>

CustomEasing.xaml.cs

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;
using System.Windows.Navigation;

namespace Silverlight30.Animation

OK
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