AE学习笔记之地图符号化

来源：互联网发布：mac查询端口占用情况编辑：程序博客网时间：2024/05/16 05:17

地图符号化就是对ArcGIS Engine中加载的地图图层进行渲染，地图图层可以分为点、线、面、三种形式。根据每个图层的图层类型可以分别对点、线、面要素，即MarkerSymbol、LineSymbol、和FillSymbol 进行渲染。

1、点对象

MarkerSymbol对于修饰点对象符号拥有五个子类：SimpleMarkerSymbol、ArrowMarkerSymbol、CharacterMarkerSymbol、PictureMarkerSymbol 和 MultilayerMarkerSymbol。一下以SimpleMarkerSymbol为例实现点对象的修饰：

 try            {                //获得点图层                IFeatureLayer layer;                layer = axMapControl1.get_Layer(0) as IFeatureLayer;                for (int i = 0; i < axMapControl1.Map.LayerCount; ++i)  //寻找点图层                {                    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对象                SimpleRenderer simpleRender = new SimpleRendererClass();                ISimpleMarkerSymbol pMarkerSymbol;                //创建颜色                IColor color;                color = new RgbColorClass();                color.RGB = 225;                //创建SimpleMarkerSymbolClass                pMarkerSymbol = new SimpleMarkerSymbolClass();                pMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSCircle;                pMarkerSymbol.Color = color;                pMarkerSymbol.Angle = 60;                pMarkerSymbol.Size = 6;                //将MarkerSymbol 赋予simpleRender的Symbol                simpleRender.Symbol = pMarkerSymbol as ISymbol;                geoFeatureLayer.Renderer = simpleRender as IFeatureRenderer;                axMapControl1.Refresh();            }            catch (Exception ex)            {                MessageBox.Show(ex.Message);            }

具体流程为：首先，新建一个要素图层的接口，并将mapControl中的第一个图层赋予该图层。

然后，将要素图层转化为地理要素图层。

接着，新建一个SimpleRendererClass对象，和ISimpleMarkerSymbol接口。设置SimpleMarkerSymbol 的颜色、类型、尺寸等信息。

//将MarkerSymbol 赋予simpleRender的Symbol
simpleRender.Symbol = pMarkerSymbol as ISymbol;
geoFeatureLayer.Renderer = simpleRender as IFeatureRenderer;

最后，设置地理要素的Render。

2、线要素

线要素与点要素相似，不过线要素的子类有8个，分别是：CartographicLineSymbol、HashLineSymbol、MarkLineSymbol、MultiLayerLineSymbol、SimpleLineSymbol、PictureLineSymbol、SimpleLine3DSymbol和TextureLineSymbol。以SimleLineSymbol为例：

 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();        }

结果如下图：

3、FillSymbol与以上两个类似，有七种填充方式。

-----------------------------------------------------------------------------------------end-------------------------------------------------------------------

0 0