ArcEngine二次开发入门.pptVIP

地图加载和显示控制 图层 ILayer：所有图层 IFeatureLayer：矢量要素图层，继承ILayer IGeoFeatureLayer：提供矢量要素图层的符号化和标注支持，继承IFeatureLayer IRasterLayer：栅格图层，继承ILayer MapControl的图层管理 AddLayer(layer, index) AddLayerFromFile(path, index) AddShapeFile(path, filename) DeleteLayer(index) MoveLayerTo(fromIndex, toIndex) get_Layer(index) LayerCount 添加ShapeFile图层 void AddShapeFileToMap(string shapeFolder, string shapeFile) { m_mapControl. AddShapeFile(shapeFolder, shapeFile) ; } void AddShapeFileToMap(string shapeFolder, string shapeFile) { IWorkspaceFactory wsf = new ShapefileWorkspaceFactoryClass(); IFeatureWorkspace ws = wsf.OpenFromFile(shapeFolder, 0) as IFeatureWorkspace; IFeatureClass fc = ws.OpenFeatureClass(shapeFile); IFeatureLayer layer = new FeatureLayerClass(); layer.FeatureClass = fc; layer.Name = (fc as IDataset).Name; m_mapControl.AddLayer(layer, 0); } 添加栅格图层 void AddRasterFileToMap(string rasterFolder, string rasterFile) { IRasterLayer layer = new RasterLayerClass(); layer.CreateFromFilePath(rasterFolder + \\ + rasterFile); layer.Name = rasterFile; m_mapControl.AddLayer(layer, 0); } void AddRasterFileToMap (string folderName, string datasetName) { IWorkspaceFactory workspaceFactory = new RasterWorkspaceFactoryClass(); IRasterWorkspace rasterWorkspace = (IRasterWorkspace)workspaceFactory.OpenFromFile(folderName, 0); IRasterDataset rasterDataset = rasterWorkspace.OpenRasterDataset(datasetName); IRasterLayer rasterLayer = new RasterLayerClass(); rasterLayer.CreateFromDataset(rasterDataset); m_mapControl.AddLayer(layer, 0); } 地图缩放的控制 修改m_mapControl.Extent可达到缩放效果。 缩放到任意范围：构建一个Envelope 缩放到图层：ILayer. AreaOfInterest 缩放到某地物：IGeometry.Envelope 缩放到选择集：合并选择集中所有Geometry的Envelope 图层的Visible控制 ILayer.Visible 几何图形 IGeometry：几何图形 IPoint：点状图形，继承IGeometry IEnvelope：矩形，继承IGeometry IPolygon：多边形，继承IGeometry IPolyline：线，继承IGeometry 符号 ISymbol：符号 IMarkerSymbol：点状符号 ILineSymbol：线状符号（线型） IFillSymbol：填充符号（填充图案） SimpleMarkerSymbol ISimple