silverlight：手写板/涂鸦/墨迹/InkPresenter示例程序

< UserControl  x:Class ="InkPresenterTest.Page"
    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"  Background ="Black"
     >

     < Grid  Background ="#FF0BB5A3"  Width ="650"  Height ="615" >

         < Grid.RowDefinitions >
             < RowDefinition  Height ="25" ></ RowDefinition >
             < RowDefinition  Height ="30" ></ RowDefinition >
             < RowDefinition ></ RowDefinition >
             < RowDefinition  Height ="30" ></ RowDefinition >
             < RowDefinition  Height ="150" ></ RowDefinition >
         </ Grid.RowDefinitions >


         < TextBlock  x:Name ="txtTitle"  Text ="InkPresenter 演 示"  FontWeight ="Bold"  Grid.Row ="0"  HorizontalAlignment ="Center"  Height ="20"  VerticalAlignment ="Center"  Foreground ="White"   />

         < StackPanel  x:Name ="spToolBar"  Grid.Row ="1"  Orientation ="Horizontal"  HorizontalAlignment ="Center"  Height ="25"  VerticalAlignment ="Center" >
             < TextBlock  Text ="笔划颜色："  VerticalAlignment ="Center" ></ TextBlock >
             < ComboBox  x:Name ="cboColor"  Width ="65"  VerticalAlignment ="Center" >
                 < ComboBox.ItemTemplate >
                     < DataTemplate >
                         < StackPanel  Orientation ="Horizontal" >
                             < Rectangle  Fill ="{Binding Color}"  ToolTipService.ToolTip ="{Binding Name}"  Width ="10"  Height ="10" />
                             < TextBlock  Text ="{Binding Name}"  Margin ="2,0,0,0"  Foreground ="{Binding Color}" ></ TextBlock >
                         </ StackPanel >
                     </ DataTemplate >
                 </ ComboBox.ItemTemplate >
             </ ComboBox >
             < TextBlock  Text ="笔划外框颜色："  VerticalAlignment ="Center"  Margin ="10,0,0,0" ></ TextBlock >
             < ComboBox  x:Name ="cboOutlineColor"  Width ="65"  VerticalAlignment ="Center" >
                 < ComboBox.ItemTemplate >
                     < DataTemplate >
                         < StackPanel  Orientation ="Horizontal" >
                             < Rectangle  Fill ="{Binding Color}"  ToolTipService.ToolTip ="{Binding Name}"  Width ="10"  Height ="10" />
                             < TextBlock  Text ="{Binding Name}"  Margin ="2,0,0,0"  Foreground ="{Binding Color}" ></ TextBlock >
                         </ StackPanel >
                     </ DataTemplate >
                 </ ComboBox.ItemTemplate >
             </ ComboBox >
             < TextBlock  Text ="笔划宽度："  Margin ="10,0,0,0"  VerticalAlignment ="Center" ></ TextBlock >
             < ComboBox  x:Name ="cboWidth"  Width ="60"  VerticalAlignment ="Center"  Height ="20" >
                 < ComboBox.ItemTemplate >
                     < DataTemplate >
                         < Rectangle  Fill ="Black"  Width ="40"  Height ="{Binding Size}" />
                     </ DataTemplate >
                 </ ComboBox.ItemTemplate >
             </ ComboBox >
             < TextBlock  Text ="笔划高度："  Margin ="10,0,0,0"  VerticalAlignment ="Center" ></ TextBlock >
             < ComboBox  x:Name ="cboHeight"  Width ="60"  VerticalAlignment ="Center"  Height ="20" >
                 < ComboBox.ItemTemplate >
                     < DataTemplate >
                         < Rectangle  Fill ="Black"  Width ="40"  Height ="{Binding Size}" />
                     </ DataTemplate >
                 </ ComboBox.ItemTemplate >
             </ ComboBox >
             < TextBlock  Text ="透明度："  Margin ="10,0,0,0"  VerticalAlignment ="Center" ></ TextBlock >
             < ComboBox  x:Name ="cboOpactiy"  Width ="60"  VerticalAlignment ="Center"  SelectionChanged ="cboOpactiy_SelectionChanged" >
                 < ComboBox.ItemTemplate >
                     < DataTemplate >
                         < StackPanel  Orientation ="Horizontal" >
                             < TextBlock  Text ="{Binding Value}"  Opacity ="{Binding Value}"   ></ TextBlock >
                         </ StackPanel >
                     </ DataTemplate >
                 </ ComboBox.ItemTemplate >
             </ ComboBox >
         </ StackPanel >

         < Canvas  x:Name ="inkC"  Grid.Row ="2"  Height ="370" >
             < Rectangle  x:Name ="rectBg"  Grid.Row ="2"  Width ="650"  Height ="370"  Fill ="#FFECD85C"  Margin ="0"  StrokeThickness ="0" ></ Rectangle >
             < Image  Source ="image/background.png"  Stretch ="UniformToFill"  x:Name ="imgBg" ></ Image >
             < InkPresenter  x:Name ="ink"  Height ="370"  Width ="650"  Grid.Row ="2"             
              Background ="Transparent"  Opacity ="1"  
              MouseLeftButtonDown ="OnMouseLeftButtonDown"
              MouseMove ="OnMouseMove"
              LostMouseCapture ="OnLostMouseCapture"  Margin ="0"
               >
                 < InkPresenter.Clip >
                     < RectangleGeometry  Rect ="0,0,650,370" ></ RectangleGeometry >
                 </ InkPresenter.Clip >


             </ InkPresenter >
            
             < TextBlock  Text ="by 菩提树下的杨过"  MouseLeftButtonDown ="TextBlock_MouseLeftButtonDown"  Cursor ="Hand"  Canvas.Left ="5"  Canvas.Top ="5"  Foreground ="LightGray" ></ TextBlock >
         </ Canvas >


         < StackPanel  x:Name ="spBtn"  Grid.Row ="3"  Height ="30"  Margin ="0"  Orientation ="Horizontal"  VerticalAlignment ="Center"  HorizontalAlignment ="Center" >
             < Button  x:Name ="btnToogleBg"   HorizontalAlignment ="Center"   Width ="80"  Content ="隐藏背景图"  VerticalAlignment ="Center"  Click ="btnToogleBg_Click" />
             < Button  x:Name ="btnToogleBgRect"   HorizontalAlignment ="Center"   Width ="80"  Content ="隐藏背景色"  VerticalAlignment ="Center"  Click ="btnToogleBgRect_Click"  Margin ="10,0,0,0" />
             < Button  x:Name ="btnSave"   HorizontalAlignment ="Center"   Width ="80"  Content ="保存图片"  VerticalAlignment ="Center"  Margin ="10,0,0,0"  Click ="btnSave_Click" />
             < Button  x:Name ="btnSaveLocal"   HorizontalAlignment ="Center"   Width ="90"  Content ="保存图片到本地"  VerticalAlignment ="Center"  Margin ="10,0,0,0"  Click ="btnSaveLocal_Click"   />
             < Button  x:Name ="btnClear"   HorizontalAlignment ="Center"   Width ="80"  Content ="清空画版"  VerticalAlignment ="Center"  Margin ="10,0,0,0"  Click ="btnClear_Click" />
             < Button  x:Name ="btnClearSave"   HorizontalAlignment ="Center"   Width ="80"  Content ="清空保存区"  VerticalAlignment ="Center"  Margin ="10,0,0,0"  Click ="btnClearSave_Click" />
         </ StackPanel >

         < ScrollViewer  x:Name ="ScreenshotViewer"  Margin ="0"  Grid.Row ="4"  Background ="#FFFFFF99"  HorizontalScrollBarVisibility ="Auto"  VerticalScrollBarVisibility ="Hidden" >
             < StackPanel  x:Name ="thumbs"   Orientation ="Horizontal" />
         </ ScrollViewer >

     </ Grid >



</ UserControl >

using  System.Windows;
using  System.Windows.Controls;
using  System.Collections.Generic;
using  System.Windows.Ink;
using  System.Windows.Input;
using  System.Windows.Media;
using  System.Windows.Shapes;
using  System.Windows.Browser;
using  System.Windows.Media.Imaging;
using  System.IO;
using  FluxJpeg.Core;

namespace  InkPresenterTest
{
     public   partial   class  Page : UserControl
    {
        Stroke _drawStroke;

        List < FillColor >  lstFillColor;
        List < SizeData >  lstSizeData;
        List < OpacityData >  lstOpacityData;

         bool  _isLoaded  =   false ;

         public  Page()
        {
            InitializeComponent();


             // 初始化数据
            lstFillColor  =   new  List < FillColor > () { 
                 new  FillColor(){ Color  =   new  SolidColorBrush(Colors.Black), Name = " 黑色 " },
                 new  FillColor(){ Color  =   new  SolidColorBrush(Colors.Red), Name = " 红色 " },
                 new  FillColor(){ Color  =   new  SolidColorBrush(Colors.Blue), Name = " 蓝色 " },
                 new  FillColor(){ Color  =   new  SolidColorBrush(Colors.Green),Name = " 绿色 " },
                 new  FillColor(){ Color  =   new  SolidColorBrush(Colors.Magenta), Name = " 洋红 " },               
                 new  FillColor(){ Color  =   new  SolidColorBrush(Colors.Orange), Name = " 橙色 " },
            };

            lstSizeData  =   new  List < SizeData > ()
            {
                 new  SizeData(){ Size = 1.0 },
                 new  SizeData(){ Size = 3.0 },
                 new  SizeData(){ Size = 5.0 },
                 new  SizeData(){ Size = 7.0 },
                 new  SizeData(){ Size = 9.0 },
                 new  SizeData(){ Size = 11.0 },
                 new  SizeData(){ Size = 13.0 },
                 new  SizeData(){ Size = 15.0 }
               
            };

            lstOpacityData  =   new  List < OpacityData > (){
                 new  OpacityData(){ Value = 0.1 },
                 new  OpacityData(){ Value = 0.2 },
                 new  OpacityData(){ Value = 0.3 },
                 new  OpacityData(){ Value = 0.4 },
                 new  OpacityData(){ Value = 0.5 },
                 new  OpacityData(){ Value = 0.6 },
                 new  OpacityData(){ Value = 0.7 },
                 new  OpacityData(){ Value = 0.8 },
                 new  OpacityData(){ Value = 0.9 },
                 new  OpacityData(){ Value = 1.0 }
            };

             this .Loaded  +=   new  RoutedEventHandler(Page_Loaded);
        }

         void  Page_Loaded( object  sender, RoutedEventArgs e)
        {
             this .cboColor.ItemsSource  =  lstFillColor;
             this .cboColor.SelectedIndex  =   0 ;

             this .cboOutlineColor.ItemsSource  =  lstFillColor;
             this .cboOutlineColor.SelectedIndex  =   0 ;

             this .cboWidth.ItemsSource  =  lstSizeData;
             this .cboWidth.SelectedIndex  =   0 ;

             this .cboHeight.ItemsSource  =  lstSizeData;
             this .cboHeight.SelectedIndex  =   0 ;

             this .cboOpactiy.ItemsSource  =  lstOpacityData;
             this .cboOpactiy.SelectedIndex  =   5 ;

            _isLoaded  =   true ;
        }


         private   void  OnMouseLeftButtonDown( object  sender, MouseEventArgs e)
        {
            ink.CaptureMouse();
            StylusPointCollection MyStylusPointCollection  =   new  StylusPointCollection();
            MyStylusPointCollection.Add(e.StylusDevice.GetStylusPoints(ink));
            _drawStroke  =   new  Stroke(MyStylusPointCollection);
            _drawStroke.DrawingAttributes.Color  =  (cboColor.SelectedItem  as  FillColor).Color.Color;
            _drawStroke.DrawingAttributes.OutlineColor  =  ( this .cboOutlineColor.SelectedItem  as  FillColor).Color.Color;
            _drawStroke.DrawingAttributes.Width  =  ( this .cboWidth.SelectedItem  as  SizeData).Size;
            _drawStroke.DrawingAttributes.Height  =  ( this .cboHeight.SelectedItem  as  SizeData).Size;
             // _drawStroke.SetValue(OpacityProperty, (this.cboOpactiy.SelectedItem as OpacityData).Value);
            ink.Strokes.Add(_drawStroke);
            ink.Opacity  =  (cboOpactiy.SelectedItem  as  OpacityData).Value;
        }


         private   void  OnMouseMove( object  sender, MouseEventArgs e)
        {
             if  (_drawStroke  !=   null )
            {
                _drawStroke.StylusPoints.Add(e.StylusDevice.GetStylusPoints(ink));
            }
        }


         private   void  OnLostMouseCapture( object  sender, MouseEventArgs e)
        {
            _drawStroke  =   null ;
        }




         private   void  btnClear_Click( object  sender, System.Windows.RoutedEventArgs e)
        {
            ink.Strokes.Clear();
        }

         private   void  cboOpactiy_SelectionChanged( object  sender, System.Windows.Controls.SelectionChangedEventArgs e)
        {
             if  (_isLoaded)
            {
                ink.Opacity  =  (cboOpactiy.SelectedItem  as  OpacityData).Value;
            }
        }

         private   void  btnToogleBg_Click( object  sender, RoutedEventArgs e)
        {
            Button btn  =  (sender  as  Button);
             if  (btn.Content.ToString()  ==   " 隐藏背景图 " )
            {
                imgBg.Visibility  =  Visibility.Collapsed;
                btn.Content  =   " 显示背景图 " ;
            }
             else
            {
                imgBg.Visibility  =  Visibility.Visible;
                btn.Content  =   " 隐藏背景图 " ;
            }
        }

         private   void  btnToogleBgRect_Click( object  sender, RoutedEventArgs e)
        {
            Button btn  =  (sender  as  Button);
             if  (btn.Content.ToString()  ==   " 隐藏背景色 " )
            {
                 this .rectBg.Visibility  =  Visibility.Collapsed;
                btn.Content  =   " 显示背景色 " ;
            }
             else
            {
                rectBg.Visibility  =  Visibility.Visible;
                btn.Content  =   " 隐藏背景色 " ;
            }
        }

         private   void  TextBlock_MouseLeftButtonDown( object  sender, MouseButtonEventArgs e)
        {
            HtmlPage.Window.Navigate( new  System.Uri( " http://yjmyzz.cnblogs.com/ " ),  " _blank " );
        }

         private   void  btnSave_Click( object  sender, RoutedEventArgs e)
        {
             //  创建一个WriteableBitmap并且把需要呈现位图的元素赋值给WriteableBitmap
            WriteableBitmap wb  =   new  WriteableBitmap(inkC,  null );

             //  创建一个Image元素来承载位图
            System.Windows.Controls.Image image  =   new  System.Windows.Controls.Image();
            image.Height  =   120 ;
            image.Margin  =   new  Thickness( 5 );
            image.Source  =  wb;

             //  将Image元素放入容器控件中
            thumbs.Children.Add(image);

            ScreenshotViewer.ScrollToHorizontalOffset(ScreenshotViewer.ExtentWidth);

        }

         private   void  btnClearSave_Click( object  sender, RoutedEventArgs e)
        {
            thumbs.Children.Clear();
        }

         private   void  btnSaveLocal_Click( object  sender, RoutedEventArgs e)
        {
            WriteableBitmap wb  =   new  WriteableBitmap(inkC,  null );

             if  (wb  !=   null )
            {
                SaveFileDialog saveDlg  =   new  SaveFileDialog();
                saveDlg.Filter  =   " JPEG Files (*.jpeg)|*.jpeg " ;
                saveDlg.DefaultExt  =   " .jpeg " ;

                 if  (saveDlg.ShowDialog().Value)
                {
                     using  (Stream fs  =  saveDlg.OpenFile())
                    {
                        SaveToFile(wb, fs);
                        MessageBox.Show( string .Format( " 文件已经保存至“{0}” " ,saveDlg.SafeFileName));
                    }
                }
            }


        }


         private   void  SaveToFile(WriteableBitmap bitmap, Stream fs)
        {
             int  width  =  bitmap.PixelWidth;
             int  height  =  bitmap.PixelHeight;
             int  bands  =   3 ;
             byte [][,] raster  =   new   byte [bands][,];

             for  ( int  i  =   0 ; i  <  bands; i ++ )
            {
                raster[i]  =   new   byte [width, height];
            }

             for  ( int  row  =   0 ; row  <  height; row ++ )
            {
                 for  ( int  column  =   0 ; column  <  width; column ++ )
                {
                     int  pixel  =  bitmap.Pixels[width  *  row  +  column];
                    raster[ 0 ][column, row]  =  ( byte )(pixel  >>   16 );
                    raster[ 1 ][column, row]  =  ( byte )(pixel  >>   8 );
                    raster[ 2 ][column, row]  =  ( byte )pixel;
                }

            }

            FluxJpeg.Core.ColorModel model  =   new  FluxJpeg.Core.ColorModel { colorspace  =  FluxJpeg.Core.ColorSpace.RGB };
            FluxJpeg.Core.Image img  =   new  FluxJpeg.Core.Image(model, raster);


             // Encode the Image as a JPEG
            MemoryStream stream  =   new  MemoryStream();
            FluxJpeg.Core.Encoder.JpegEncoder encoder  =   new  FluxJpeg.Core.Encoder.JpegEncoder(img,  100 , stream);
            encoder.Encode();

             // Back to the start
            stream.Seek( 0 , SeekOrigin.Begin);

             // Get teh Bytes and write them to the stream
             byte [] binaryData  =   new   byte [stream.Length];
             long  bytesRead  =  stream.Read(binaryData,  0 , ( int )stream.Length);
            fs.Write(binaryData,  0 , binaryData.Length);
        }

    }




     public   class  FillColor
    {
         public  SolidColorBrush Color {  set ;  get ; }
         public   string  Name {  set ;  get ; }
    }


     public   class  SizeData
    {
         public   double  Size {  set ;  get ; }
    }


     public   class  OpacityData
    {
         public   double  Value {  set ;  get ; }
    }
}