???????? 地圖符號化就是對ArcGIS Engine中加載的地圖圖層進行渲染，地圖圖層可以分為點、線、面、三種形式。根據每個圖層的圖層類型可以分別對點、線、面要素，即MarkerSymbol、LineSymbol、和FillSymbol 進行渲染。

??????? 1、點對象

??????? MarkerSymbol對于修飾點對象符號擁有五個子類：SimpleMarkerSymbol、ArrowMarkerSymbol、CharacterMarkerSymbol、PictureMarkerSymbol 和 MultilayerMarkerSymbol。一下以SimpleMarkerSymbol為例實現點對象的修飾：

try{//獲得點圖層IFeatureLayer layer;layer = axMapControl1.get_Layer(0) as IFeatureLayer;for (int i = 0; i < axMapControl1.Map.LayerCount; ++i) //尋找點圖層{layer = axMapControl1.get_Layer(i) as IFeatureLayer;if (layer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPoint)break;}if (layer.FeatureClass.ShapeType != esriGeometryType.esriGeometryPoint)return;//QI到IGeoFeatureLayer接口IGeoFeatureLayer geoFeatureLayer = layer as IGeoFeatureLayer;//新建SimpleRendererClass對象SimpleRenderer simpleRender = new SimpleRendererClass();ISimpleMarkerSymbol pMarkerSymbol;//創建顏色IColor color;color = new RgbColorClass();color.RGB = 225;//創建SimpleMarkerSymbolClasspMarkerSymbol = new SimpleMarkerSymbolClass();pMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSCircle;pMarkerSymbol.Color = color;pMarkerSymbol.Angle = 60;pMarkerSymbol.Size = 6;//將MarkerSymbol 賦予simpleRender的SymbolsimpleRender.Symbol = pMarkerSymbol as ISymbol;geoFeatureLayer.Renderer = simpleRender as IFeatureRenderer;axMapControl1.Refresh();}catch (Exception ex){MessageBox.Show(ex.Message);}

??????? 具體流程為：首先，新建一個要素圖層的接口，并將mapControl中的第一個圖層賦予該圖層。

????????????????????????????? 然后，將要素圖層轉化為地理要素圖層。

??????????????????????????????接著，新建一個SimpleRendererClass對象，和ISimpleMarkerSymbol接口。設置SimpleMarkerSymbol 的顏色、類型、尺寸等信息。

//將MarkerSymbol 賦予simpleRender的Symbol
??????????????? simpleRender.Symbol = pMarkerSymbol as ISymbol;
??????????????? geoFeatureLayer.Renderer = simpleRender as IFeatureRenderer;

????????????????????????????? 最后，設置地理要素的Render。

???????? 2、線要素

???????? 線要素與點要素相似，不過線要素的子類有8個，分別是：CartographicLineSymbol、HashLineSymbol、MarkLineSymbol、MultiLayerLineSymbol、SimpleLineSymbol、PictureLineSymbol、SimpleLine3DSymbol和TextureLineSymbol。以SimleLineSymbol為例：

private void simpleLineSymbolToolStripMenuItem_Click(object sender, EventArgs e){IGeoFeatureLayer geoFeatureLayer;geoFeatureLayer = axMapControl1.get_Layer(0) as IGeoFeatureLayer;ISimpleRenderer simpleRender;simpleRender = new SimpleRendererClass();IRgbColor HC = new RgbColor();HC.Red = 225;HC.Green = 0;HC.Blue = 0;ISimpleLineSymbol simpleLineSymbol = new SimpleLineSymbolClass();simpleLineSymbol.Color = HC;simpleLineSymbol.Width = 5;simpleLineSymbol.Style = esriSimpleLineStyle.esriSLSDashDot;simpleRender.Symbol = simpleLineSymbol as ISymbol;geoFeatureLayer.Renderer = simpleRender as IFeatureRenderer;axMapControl1.Refresh();axTOCControl1.Update();}

結果如下圖： 3、FillSymbol與以上兩個類似，有七種填充方式。 -----------------------------------------------------------------------------------------end-------------------------------------------------------------------

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