稳扎稳打Silverlight(38) - 3.0滤镜之BlurEffect, DropShadowEffect, 自定义滤镜

<navigation:Page x:Class="Silverlight30.Graphic.BlurEffect"    
                     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="BlurEffect Page"> 
        <Grid x:Name="LayoutRoot"> 
                <StackPanel> 
                 
                        <!-- 
                                滤镜效果之 Blur 
                                BlurEffect - 模糊效果 
                                        BlurEffect.Radius - 模糊半径。越大越模糊，默认值为 5 
                        --> 
                 
                        <Image Source="/Resource/Logo.jpg"> 
                                <Image.Effect> 
                                        <BlurEffect x:Name="blurEffect" Radius="5" /> 
                                </Image.Effect> 
                        </Image> 
                         
                        <Slider Width="500" Minimum="0" Maximum="10" Value="{Binding Radius, Mode=TwoWay, ElementName=blurEffect}" /> 
                         
                </StackPanel> 
        </Grid> 
</navigation:Page>

<navigation:Page x:Class="Silverlight30.Graphic.DropShadowEffect"    
                     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="DropShadowEffect Page"> 
        <Grid x:Name="LayoutRoot"> 
                <StackPanel> 
                 
                        <!-- 
                                滤镜效果之 DropShadow 
                                DropShadowEffect - 阴影效果 
                                        DropShadowEffect.BlurRadius - 阴影的模糊半径。默认值为 5 
                                        DropShadowEffect.Color - 阴影的颜色。默认值为 FF000000 
                                        DropShadowEffect.Direction - 阴影相对于 UIElement 的方向。以光源从右向左照射为 0 度，度数为逆时针正累加，默认值 315 度（即阴影在 UIElement 的右下角） 
                                        DropShadowEffect.Opacity - 阴影的不透明度。默认值为 1 
                                        DropShadowEffect.ShadowDepth - 阴影的深度（即阴影与 UIElement 间的偏离量）。默认值为 5，有效值为 0 - 300 之间 
                        --> 
                 
                        <Image Source="/Resource/Logo.jpg"> 
                                <Image.Effect> 
                                        <DropShadowEffect x:Name="dropShadowEffect"    
                                                                            BlurRadius="5"    
                                                                            Color="Blue"    
                                                                            Direction="315"    
                                                                            Opacity="1"    
                                                                            ShadowDepth="5" /> 
                                </Image.Effect> 
                        </Image> 
                         
                        <Slider Width="500" Minimum="0" Maximum="10" Value="{Binding BlurRadius, Mode=TwoWay, ElementName=dropShadowEffect}" /> 
                        <Slider Width="500" Minimum="0" Maximum="360" Value="{Binding Direction, Mode=TwoWay, ElementName=dropShadowEffect}" /> 
                        <Slider Width="500" Minimum="0" Maximum="1" Value="{Binding Opacity, Mode=TwoWay, ElementName=dropShadowEffect}" /> 
                        <Slider Width="500" Minimum="0" Maximum="100" Value="{Binding ShadowDepth, Mode=TwoWay, ElementName=dropShadowEffect}" /> 
                         
                </StackPanel> 
        </Grid> 
</navigation:Page>

<navigation:Page x:Class="Silverlight30.Graphic.BandedSwirlEffect"    
                     xmlns:effects="clr-namespace:ShaderEffectLibrary" 
                     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="SwirlEffect Page"> 
        <Grid x:Name="LayoutRoot"> 
                <StackPanel> 
                 
                        <!-- 
                                Silverlight 3.0 只有两个内置滤镜：BlurEffect 和 DropShadowEffect 
                                其他更多滤镜可以在 http://www.codeplex.com/wpffx 下载。滤镜的算法本质上来说都是基于像素的渲染器 
                                .fx 为滤镜源文件，编译后为 .ps 文件，.cs 文件可以调用 .ps 文件，从而在 Silverlight 中呈现具体的滤镜效果 
                                以下以一个条纹漩涡滤镜为例演示 http://www.codeplex.com/wpffx 上的滤镜库的应用 
                        --> 
                 
                        <Image Source="/Resource/Logo.jpg"> 
                                <Image.Effect> 
                                        <effects:BandedSwirlEffect SwirlStrength="10" /> 
                                </Image.Effect> 
                        </Image> 
                         
                </StackPanel>                 
        </Grid> 
</navigation:Page>

<navigation:Page x:Class="Silverlight30.Graphic.Projection"    
                     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" 
                     Title="Projection Page"> 
        <Grid x:Name="LayoutRoot"> 
                <StackPanel> 
                 
                        <!-- 
                                Projection - 映射 
                                PlaneProjection - 将平面的 UIElement 映射到 3D 
                                        RotationX, RotationY, RotationZ - 绕 X轴, Y轴, Z轴 旋转的角度 
                                        CenterOfRotationX, CenterOfRotationY, CenterOfRotationZ - X轴, Y轴, Z轴 旋转中心点的相对位置（CenterOfRotationX, CenterOfRotationY 默认值为 0.5 ， CenterOfRotationZ 默认值为 0） 
                                        GlobalOffsetX, GlobalOffsetY, GlobalOffsetZ - 沿 X轴, Y轴, Z轴 的偏移量，此 3 个方向与屏幕的 3 个方向相同 
                                        LocalOffsetX, LocalOffsetY, LocalOffsetZ - 沿 X轴, Y轴, Z轴 的偏移量，此 3 个方向与 相关UIElement 当前的 3 个方向相同 
                        --> 
                 
                        <MediaElement x:Name="mediaElement" Source="/Resource/Demo.mp4" AutoPlay="True" MediaEnded="mediaElement_MediaEnded" Width="320" Height="240"> 
                                <MediaElement.Projection> 
                                        <PlaneProjection x:Name="projection" /> 
                                </MediaElement.Projection> 
                        </MediaElement> 
                                                 
                        <Slider Minimum="0" Maximum="360" Value="{Binding RotationX, Mode=TwoWay, ElementName=projection}" ToolTipService.ToolTip="RotationX" /> 
                        <Slider Minimum="0" Maximum="360" Value="{Binding RotationY, Mode=TwoWay, ElementName=projection}" ToolTipService.ToolTip="RotationY" /> 
                        <Slider Minimum="0" Maximum="360" Value="{Binding RotationZ, Mode=TwoWay, ElementName=projection}" ToolTipService.ToolTip="RotationZ" /> 
                         
                </StackPanel> 
        </Grid> 
</navigation:Page>

<navigation:Page x:Class="Silverlight30.Graphic.WriteableBitmapDemo"    
                     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="WriteableBitmapDemo Page"> 
        <Grid x:Name="LayoutRoot"> 
                <StackPanel HorizontalAlignment="Left"> 
                 
                        <Image x:Name="img" /> 
                         
                        <Image x:Name="img2" /> 
                         
                        <TextBlock x:Name="lbl" /> 
                        <Image x:Name="img3" Source="/Resource/Logo.jpg" MouseMove="img3_MouseMove"/> 
                         
                        <StackPanel Orientation="Horizontal"> 
                                <MediaElement x:Name="mediaElement" Source="/Resource/Demo.mp4" MediaEnded="mediaElement_MediaEnded" /> 
                                <Button Content="截屏" Click="Button_Click" Width="40" Height="30" VerticalAlignment="Center" /> 
                                <Image x:Name="img4" /> 
                        </StackPanel> 
            
                </StackPanel> 
        </Grid> 
</navigation:Page>

/* 
 * WriteableBitmap - 位图 API（Bitmap API） 
 * WriteableBitmap.Pixels - 一个整型数组，用于描述某像素的颜色（ARGB） 
 * WriteableBitmap.Render() - 将指定的 UIElement 以位图的方式呈现出来 
 * WriteableBitmap.Invalidate() - 绘图 
 * WriteableBitmap.PixelWidth - 宽度。单位：像素 
 * WriteableBitmap.PixelHeight - 高度。单位：像素 
 */ 
 
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 System.Windows.Media.Imaging; 
 
namespace Silverlight30.Graphic 
{ 
         public partial  class WriteableBitmapDemo : Page 
        { 
                 public WriteableBitmapDemo() 
                { 
                        InitializeComponent(); 
 
                         this.Loaded +=  new RoutedEventHandler(WriteableBitmapDemo_Loaded); 
                         this.Loaded +=  new RoutedEventHandler(WriteableBitmapDemo_Loaded2); 
                } 
 
                 /// <summary> 
                 /// 以自定义像素点颜色的方式生成位图 
                 /// </summary> 
                 void WriteableBitmapDemo_Loaded( object sender, RoutedEventArgs e) 
                { 
                         // 初始化一个宽 40 高 20 的 WriteableBitmap 对象 
                        WriteableBitmap bitmap =  new WriteableBitmap(40, 30); 
                         
                         for ( int i = 0; i < 40 * 30; i++) 
                        { 
                                 unchecked 
                                { 
                                         // 每个像素的颜色的描述规范为 ARGB 
                                        bitmap.Pixels[i] = ( int)0xFFFF0000; 
                                } 
                        } 
 
                        bitmap.Invalidate(); 
 
                        img.Source = bitmap; 
                } 
 
                 /// <summary> 
                 /// 将指定的 UIElement 以位图的方式做呈现 
                 /// </summary> 
                 void WriteableBitmapDemo_Loaded2( object sender, RoutedEventArgs e) 
                { 
                        WriteableBitmap bitmap =  new WriteableBitmap(320, 240); 
 
                        var txt =  new TextBlock(); 
                        txt.Text =  "webabcd"; 
 
                         // 将指定的 TextBlock 以位图的方式呈现出来 
                        bitmap.Render(txt,  new ScaleTransform() { ScaleX = 320 / txt.ActualWidth, ScaleY = 240 / txt.ActualHeight }); 
                        bitmap.Invalidate(); 
 
                        img2.Source = bitmap; 
                } 
 
                 /// <summary> 
                 /// 获取指定图片的某像素点的颜色 
                 /// </summary> 
                 private  void img3_MouseMove( object sender, MouseEventArgs e) 
                { 
                        WriteableBitmap bitmap =  new WriteableBitmap(img3,  null); 
 
                         int color = bitmap.Pixels[( int)e.GetPosition(img3).Y * ( int)img3.ActualWidth + ( int)e.GetPosition(img3).X]; 
 
                         // 将整型转换为字节数组 
                         byte[] bytes = BitConverter.GetBytes(color); 
 
                         // 将字节数组转换为颜色（bytes[3] - A, bytes[2] - R, bytes[1] - G, bytes[0] - B） 
                        lbl.Text = Color.FromArgb(bytes[3], bytes[2], bytes[1], bytes[0]).ToString(); 
                } 
 
                 /// <summary> 
                 /// 用 WriteableBitmap 实现对视频文件的截屏功能 
                 /// </summary> 
                 private  void Button_Click( object sender, RoutedEventArgs e) 
                { 
                         // 将指定的 UIElement 转换为 WriteableBitmap 对象 
                        WriteableBitmap bitmap =  new WriteableBitmap(mediaElement,  null); 
 
                        img4.Source = bitmap; 
                } 
 
                 private  void mediaElement_MediaEnded( object sender, RoutedEventArgs e) 
                { 
                        mediaElement.Stop(); 
                        mediaElement.Play(); 
                } 
        } 
}