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稳扎稳打Silverlight(37) - 3.0动画之Easing（缓动效果）
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
http://www.cnblogs.com/webabcd/archive/2009/08/04/1538238.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
/*
* Easing - 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）
*/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{
public partial class Easing : Page
{
public Easing() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Easing_Loaded);
} // 绑定各种 Easing 的图例列表 void Easing_Loaded(object sender, RoutedEventArgs e) { XElement root = XElement.Load("Animation/Easing.xml"); var easings = from n in root.Elements("easing") select new EasingModel { EasingName = (string)n.Attribute("EasingName"), Description = (string)n.Attribute("Description"), PicAddress = (string)n.Attribute("PicAddress") }; lstEasing.ItemsSource = easings; lstEasing.SelectedIndex = 0; } private Storyboard _prevStoryboard; private void btnShow_Click(object sender, RoutedEventArgs e) { if (_prevStoryboard != null) _prevStoryboard.Stop(); // 实例化用户所选择的 Easing Type type = typeof(EasingFunctionBase).Assembly.GetType("System.Windows.Media.Animation." + ((EasingModel)lstEasing.SelectedItem).EasingName, false); EasingFunctionBase easing = Activator.CreateInstance(type) as EasingFunctionBase; // 根据用户的选择，设置 Easing 的 EasingMode 属性 easing.EasingMode = (EasingMode)Enum.Parse(typeof(EasingMode), ((ComboBoxItem)cboEasingMode.SelectedItem).Content.ToString(), true); Storyboard sb = new Storyboard(); _prevStoryboard = sb; var transformType = ((ComboBoxItem)cboTransform.SelectedItem).Content.ToString(); switch (transformType) { // 位移动画结合 Easing 的演示 case "Translate": DoubleAnimation daTranslateY = new DoubleAnimation(); daTranslateY.From = 0 ; daTranslateY.To = 200; daTranslateY.Duration = TimeSpan.FromSeconds(3); daTranslateY.EasingFunction = easing; Storyboard.SetTargetProperty(daTranslateY, new PropertyPath("Y")); Storyboard.SetTarget(daTranslateY, tt); sb.Children.Add(daTranslateY); break; // 缩放动画结合 Easing 的演示 case "Scale": DoubleAnimation daScaleX = new DoubleAnimation(); daScaleX.From = 1; daScaleX.To = 2; daScaleX.Duration = TimeSpan.FromSeconds(3); DoubleAnimation daScaleY = new DoubleAnimation(); daScaleY.From = 1; daScaleY.To = 2; daScaleY.Duration = TimeSpan.FromSeconds(3); daScaleX.EasingFunction = easing; daScaleY.EasingFunction = easing; Storyboard.SetTargetProperty(daScaleX, new PropertyPath("ScaleX")); Storyboard.SetTarget(daScaleX, st); Storyboard.SetTargetProperty(daScaleY, new PropertyPath("ScaleY")); Storyboard.SetTarget(daScaleY, st); sb.Children.Add(daScaleX); sb.Children.Add(daScaleY); break; // 旋转动画结合 Easing 的演示 case "Rotate": DoubleAnimation daAngle = new DoubleAnimation(); daAngle.To = 0; daAngle.To = 360; daAngle.Duration = TimeSpan.FromSeconds(3); daAngle.EasingFunction = easing; Storyboard.SetTargetProperty(daAngle, new PropertyPath("Angle")); Storyboard.SetTarget(daAngle, rt); sb.Children.Add(daAngle); break; } sb.Begin(); } }}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{ /// <summary> /// 自定义缓动效果 /// </summary> public class MyCustomEasing : EasingFunctionBase { public MyCustomEasing() : base() { } /// <summary> /// 实现 EaseIn 模式下的逻辑 /// EaseOut 和 EaseInOut 会自动实现 /// </summary> /// <param name="normalizedTime">标准时间位（0 - 1之间）。即 动画运行到此的时间 占 动画运行所需的全部时间 的百分比</param> /// <returns></returns> protected override double EaseInCore(double normalizedTime) { // QuinticEase 效果的实现算法 // 假定动画运行的总共时间为 1 秒 // 那么当 normalizedTime 为 0.1 时，动画运行到的位置为无该缓动效果时，0.00001秒后的位置。以此类推 return Math.Pow(normalizedTime, 5); } }}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{ public partial class CustomEasing : Page { public CustomEasing() { InitializeComponent(); } private void btnShow_Click(object sender, RoutedEventArgs e) { ani.Begin(); } }}OK
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