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

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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

/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


/*


* 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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