Silverlight 控件截图与InkPresenter画笔

控件截图

控件截图关键是，System.Windows.Media.Imaging 空间下的 WriteableBitmap 对象

using System.Windows.Media.Imaging;

private void media_MouseLeftButtonDown(object sender
            , MouseButtonEventArgs e)
        {
            //创′建¨可é写′入?位?图?对?象ó，?尺?寸?根ù据YMediaElement的?实μ际ê大ó小?
            WriteableBitmap wBitmap = new WriteableBitmap(media.NaturalVideoWidth
                , media.NaturalVideoHeight);
            //将?当±前°的?视ó频μ内ú容Y保￡存?起e来′
            wBitmap.Render(media, new MatrixTransform());
            //创′建¨一?个?图?像?
            Image img = new Image();
            img.Width = 150;
            img.Margin = new Thickness(10);
            //将?wBitmap做?为a图?像?源′
            img.Source = wBitmap;
            //将?图?像?添í加ó到?WrapPanel控?件t
            //    wrap.Children.Add(img);
        }

InkPresenter 画笔

InkPresenter画笔，就是一个涂抹输入工具，通过鼠标或者绘画笔，写字啊，画图形，他就像是一个画板，可以在上面作画。

using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Ink;

//定¨义?一?个?画-笔ê对?象ó
        private Stroke myStroke;
        private void IP_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            //墨?迹￡画-笔ê捕?获?鼠ó标ê
            IP.CaptureMouse();
            //创′建¨画-笔ê坐?标ê集ˉ合?SPC
            StylusPointCollection SPC = new StylusPointCollection();
            //将?当±前°IP对?象ó的?坐?标ê集ˉ合?添í加ó到?SPC
            SPC.Add(e.StylusDevice.GetStylusPoints(IP));
            //将?坐?标ê集ˉ合?添í加ó到?画-笔ê对?象ó
            myStroke = new Stroke(SPC);
            //墨?迹￡的?尺?寸?
            myStroke.DrawingAttributes.Width = 10;
            myStroke.DrawingAttributes.Height = 10;
            //墨?迹￡的?颜?色?
            myStroke.DrawingAttributes.Color = Colors.White;
            //将?画-笔ê对?象ó添í加ó到?IP的?画-笔ê集ˉ合?中D
            IP.Strokes.Add(myStroke);
        }

        private void IP_MouseMove(object sender, MouseEventArgs e)
        {
            if (myStroke != null)
            {
                /* 当±鼠ó标ê移?动ˉ时±，?如?果?画-笔ê不?为a空?值μ就í继ì续?添í加ó
                新?的?坐?标ê点?到?StylusPoints集ˉ合? */
                myStroke.StylusPoints.Add(e.StylusDevice.GetStylusPoints(IP));
            }
        }

        private void IP_LostMouseCapture(object sender, MouseEventArgs e)
        {
            //释í放?鼠ó标ê后ó将?画-笔ê置?为a空?值μ
            myStroke = null;
        }

示例源自Silverlight 3 开发详解一书代码