稳扎稳打Silverlight(38) - 3.0滤镜之BlurEffect, DropShadowEffect, 自定义滤镜, 3D效果之PlaneProjection, 位图API之WriteableBitmap

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稳扎稳打Silverlight(38) - 3.0滤镜之BlurEffect, DropShadowEffect, 自定义滤镜, 3D效果之PlaneProjection, 位图API之WriteableBitmap


作者：webabcd


介绍
Silverlight 3.0 图形系统的相关新增功能
  • BlurEffect - 模糊滤镜 
  • DropShadowEffect - 阴影滤镜
  • 自定义滤镜 
  • PlaneProjection - 将平面的 UIElement 映射到 3D
  • WriteableBitmap - 位图 API（Bitmap API）


在线DEMO
http://www.cnblogs.com/webabcd/archive/2009/08/04/1538238.html


示例
1、模糊滤镜(BlurEffect)的演示
BlurEffect.xaml
<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>


2、阴影滤镜(DropShadowEffect)的演示
DropShadowEffect.xaml
<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>


3、自定义滤镜的实现。滤镜库地址http://www.codeplex.com/wpffx
以下以条纹漩涡滤镜为例演示
BandedSwirlEffect.xaml
<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>


4、3D效果的演示
Projection.xaml
<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>


5、应用位图 API（Bitmap API）实现常用功能的演示
WriteableBitmapDemo.xaml
<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>

WriteableBitmapDemo.xaml.cs
/*
 * 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();
        }
    }
}


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[源码下载]
posted @ 2009-08-27 08:59  webabcd  阅读(7903)  评论(10)  编辑  收藏  举报