silverlight学习笔记（4） 画图

      silverlight里画图形很方面。

      1，GraphicsLayer图层相当于一个画布。

      2，要有2个元素：Geometry和Symbol。

           下面是画线的例子：

     Xaml代码：

      <Grid x:Name="LayoutRoot" BACkground="White">
        <Grid.resources>
            <esri:SimpleLinesymbol x:Key="DrawLinesymbol" Color="Green" Width="4"/>
            <esri:SimpleFillSymbol x:Key="DrawFillSymbol" Fill="#3300ff00" BorderBrush="Green" BorderThickness="2"/>
            <esri:SimpleLinesymbol x:Key="DefaultLinesymbol" Color="Red" Width="4"/>
            <esri:SimpleFillSymbol x:Key="DefaultFillSymbol" Fill="#33ff0000" BorderBrush="Red" BorderThickness="2"/>
        </Grid.resources>
        <esri:Map x:Name="MymapDefault">
            <esri:ArcGISTiledMapserviceLayer ID="ShadeRelief" Opacity="0.75"
                    Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"/>
            <esri:GraphicsLayer x:Name="graphicsLayer" ID="MyGraphicsLayer"></esri:GraphicsLayer>
        </esri:Map>
    </Grid>

  Cs代码：

        Draw MyDrawObject = new Draw();
        private Symbol _activeSymbol = null;
        public MainPage()
        {
            InitializeComponent();

            MyDrawObject = new Draw(MymapDefault)
            {
                Linesymbol=LayoutRoot.resources["DrawLinesymbol"] as Linesymbol,
                FillSymbol=LayoutRoot.resources["DrawFillSymbol"] as FillSymbol
            };
            MyDrawObject.DrawComplete+=new EventHandler<DrawEventArgs>(MyDrawObject_DrawCompletE);

            MyDrawObject.DrawMode = DrawMode.Polyline;             _activeSymbol = LayoutRoot.resources["DefaultLinesymbol"] as Symbol;             MyDrawObject.IsEnabled = true;         }         private void MyDrawObject_DrawComplete(object sender,DrawEventArgs args)         {             GraphicsLayer graphicsLayer = MymapDefault.Layers["MyGraphicsLayer"] as GraphicsLayer;                         Graphic graphic = new Graphic()             {                 Geometry = args.Geometry,                Symbol = _activeSymbol,            };             graphicsLayer.Graphics.Add(graphic);         }