ArcEngine开发入门PPT教学课件

1、MapControl的图层管理 AddLayer(layer, index) AddLayerFromFile(path, index) AddShapeFile(path, filename) DeleteLayer(index) MoveLayerTo(fromIndex, toIndex) get_Layer(index) LayerCount第1页/共29页添加ShapeFile图层void AddShapeFileToMap(string shapeFolder, string shapeFile) m_mapControl. AddShapeFile(shapeFolder, sh

2、apeFile) ;第2页/共29页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 Feat

3、ureLayerClass(); layer.FeatureClass = fc; layer.Name = (fc as IDataset).Name; m_mapControl.AddLayer(layer, 0);第3页/共29页添加栅格图层void AddRasterFileToMap(string rasterFolder, string rasterFile)IRasterLayer layer = new RasterLayerClass(); layer.CreateFromFilePath(rasterFolder + + rasterFile); layer.Name =

4、rasterFile; m_mapControl.AddLayer(layer, 0);第4页/共29页void AddRasterFileToMap (string folderName, string datasetName)IWorkspaceFactory workspaceFactory = new RasterWorkspaceFactoryClass(); IRasterWorkspace rasterWorkspace = (IRasterWorkspace)workspaceFactory.OpenFromFile(folderName, 0); IRasterDataset

5、 rasterDataset = rasterWorkspace.OpenRasterDataset(datasetName); IRasterLayer rasterLayer = new RasterLayerClass();rasterLayer.CreateFromDataset(rasterDataset);m_mapControl.AddLayer(layer, 0);第5页/共29页地图缩放的控制 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：IGeom

6、etry.Envelope 缩放到选择集：合并选择集中所有Geometry的Envelope第6页/共29页图层的Visible控制 ILayer.Visible第7页/共29页几何图形 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第8页/共29页符号 ISymbol：符号 IMarkerSymbol：点状符号 ILineSymbol：线状符号（线型） IFillSymbol：填充符号（填充图案）第9页/共29页Si

7、mpleMarkerSymbolISimpleMarkerSymbol CreateSimpleMarkerSymbol(IRgbColor rgbColor, esriSimpleMarkerStyle inputStyle) if(rgbColor = null | inputStyle = null) return null; ISimpleMarkerSymbol simpleMarkerSymbol = new SimpleMarkerSymbolClass(); simpleMarkerSymbol.Color = rgbColor; simpleMarkerSymbol.Styl

8、e = inputStyle; return simpleMarkerSymbol; 第10页/共29页SimpleLineSymbolpublic ISimpleLineSymbol CreateSimpleLineSymbol(IRgbColor rgbColor, double inWidth, esriSimpleLineStyle inStyle) if(rgbColor = null) return null; ISimpleLineSymbol simpleLineSymbol = new SimpleLineSymbolClass(); simpleLineSymbol.Sty

9、le = inStyle; simpleLineSymbol.Color = rgbColor; simpleLineSymbol.Width = inWidth; return simpleLineSymbol;第11页/共29页SimpleFillSymbolpublic ISimpleFillSymbol CreateSimpleFillSymbol(IRgbColor fillColor, esriSimpleFillStyle fillStyle, IRgbColor borderColor, esriSimpleLineStyle borderStyle, double borde

10、rWidth) if(fillColor = null | fillStyle = null | borderColor = null | borderStyle = null) return null; ISimpleLineSymbol simpleLineSymbol = new SimpleLineSymbolClass(); simpleLineSymbol.Width = borderWidth; simpleLineSymbol.Color = borderColor; simpleLineSymbol.Style = borderStyle; ISimpleFillSymbol

11、 simpleFillSymbol = new SimpleFillSymbolClass(); simpleFillSymbol.Outline = simpleLineSymbol; simpleFillSymbol.Style = fillStyle; simpleFillSymbol.Color = fillColor; return simpleFillSymbol;第12页/共29页矢量图层渲染 矢量图层： IFeatureRenderer IGeoFeatureLayer.Renderer; 设置新的Renderer后刷新 layer.Renderer = renderer; m

12、_mapControl.ActiveView.Refresh(); m_tocControl.Update();第13页/共29页IFeatureRenderer ISimpleRenderer：简单渲染（所有要素采用相同的渲染方式） IUniqueValueRenderer：唯一值分类渲染 IClassBreaksRenderer：连续值分级渲染第14页/共29页SimpleRenderer 所有要素采用相同的渲染方式 根据图层的要素类型创建一个Symbol第15页/共29页void SetFeatureLayerSimpleRenderer(IFeatureLayer layer, ICo

13、lor outlineColor,IColor fillColor) ISimpleRenderer pRender = new SimpleRendererClass(); ISimpleFillSymbol symd = new SimpleFillSymbolClass(); symd.Style = esriSimpleFillStyle.esriSFSSolid; symd.Color = fillColor; pRender.Symbol = symd as ISymbol; (layer as IGeoFeatureLayer).Renderer = pRender as IFe

14、atureRenderer; 第16页/共29页UniqueValueRenderer 字段：至少一个，离散类型，一般式整数或字符串 有限的字段值 每个字段值对应的Symbol 每个字段值对应的Label DefaultSymbol第17页/共29页 private static void SetFeatureLayerUniqueValueRenderer(IFeatureLayer layer, string field, string values, IColor colors) IUniqueValueRenderer pRender = new UniqueValueRenderer

15、Class(); ISimpleFillSymbol symd = new SimpleFillSymbolClass(); symd.Style = esriSimpleFillStyle.esriSFSSolid; symd.Outline.Width = 0.4;pRender.FieldCount = 1; pRender.set_Field(0, field); pRender.DefaultSymbol = symd as ISymbol; pRender.UseDefaultSymbol = true; for (int i = 0; i values.Length; i+) I

16、SimpleFillSymbol symx = new SimpleFillSymbolClass(); symx.Style = esriSimpleFillStyle.esriSFSSolid; symx.Outline.Width = 0.4; symx.Color = colorsi; pRender.AddValue(valuesi, field, symx as ISymbol); pRender.set_Label(valuesi, valuesi);pRender.ColorScheme = Custom; pRender.set_FieldType(0, true); / 表

17、明字段是否为string类型 (layer as IGeoFeatureLayer).Renderer = pRender as IFeatureRenderer;第18页/共29页ClassBreaksRenderer 字段：必须是数值类型 MinimumBreak：最小分段值 Breaks：分段值（不含MinimumBreak），需要n个 每段对应的Symbol 每段对应的Label 可用AlgorithmicColorRamp来设置渐变颜色第19页/共29页 IClassBreaksRenderer CreateClassBreaksRenderer(string field, doub

18、le breaks, IColor colors) IClassBreaksRenderer pRender = new ClassBreaksRendererClass(); pRender.Field = field; pRender.BreakCount = breaks.Length-1; pRender.MinimumBreak = breaks0; for (int i = 0; i breaks.Length-1; i+) pRender.set_Break(i, breaksi + 1); pRender.set_Label(i, string.Format(0 - 1, br

19、eaksi, breaksi + 1); IFillSymbol pSimpleFillSym = new SimpleFillSymbolClass(); pSimpleFillSym.Color = colorsi; pRender.set_Symbol(i, pSimpleFillSym as ISymbol); return pRender;第20页/共29页用AlgorithmicColorRamp获得渐变颜色 IAlgorithmicColorRamp pColorRamp = new AlgorithmicColorRamp(); pColorRamp.Algorithm = e

20、sriColorRampAlgorithm.esriCIELabAlgorithm; IRgbColor pColor1 = new RgbColorClass() ; IRgbColor pColor2 = new RgbColorClass(); pColor1.Red = 255; pColor1.Green = 210; pColor1.Blue = 210; pColor2.Red = 190; pColor2.Green = 0; pColor2.Blue = 170; pColorRamp.FromColor = pColor1; pColorRamp.ToColor = pCo

21、lor2; pColorRamp.Size = breaks.Length; bool ok; pColorRamp.CreateRamp(out ok); IEnumColors pEnumColors = pColorRamp.Colors; pEnumColors.Reset();。 pSimpleFillSym.Color = pEnumColors.Next();。第21页/共29页栅格图层渲染 栅格图层 IRasterRenderer IRasterLayer.Renderer; 设置新的Renderer后刷新renderer.Update(); layer.Renderer =

22、renderer; m_mapControl.ActiveView.Refresh(); m_tocControl.Update();第22页/共29页IRasterRenderer IRasterUniqueValueRenderer：唯一值分类渲染 IRasterClassifyColorRampRenderer：连续值分级渲染 IRasterRGBRenderer：RGB渲染，指定R、G、B波段第23页/共29页RasterUniqueValueRenderer 一般针对有RasterAttributeTable的栅格 RAT: OID、VALUE、COUNT、用户字段(optional

23、) Raster：IRasterLayer.Raster、IRasterDataset.CreateDefaultRaster() 字段 字段值：从RAT来 每个字段值对应的符号（FillSymbol） 每个字段值对应的Label 可用RandomColorRamp获得随机颜色第24页/共29页 public IRasterRenderer UnqueValueRenderer(IRasterLayer rasterLayer) IRaster2 raster = (IRaster2)rasterLayer.Raster; ITable rasterTable = raster.Attribu

24、teTable; if (rasterTable = null) return null; int tableRows = rasterTable.RowCount(null); IRgbColor colors = new RgbColorClasstableRows; 。 IRasterUniqueValueRenderer uvRenderer = new RasterUniqueValueRendererClass(); IRasterRenderer rasterRenderer = (IRasterRenderer)uvRenderer; rasterRenderer.Raster

25、 = rasterLayer.Raster; rasterRenderer.Update(); uvRenderer.set_ClassCount(0, tableRows); uvRenderer.Field = Value; /Or any other field in the table. IRow row; ISimpleFillSymbol fillSymbol; for (int i = 0; i tableRows; i+) row = rasterTable.GetRow(i); uvRenderer.AddValue(0, i, Convert.ToByte(row.get_

26、Value(1); / Assuming the raster is 8-bit. uvRenderer.set_Label(0, i, Convert.ToString(row.get_Value(1); fillSymbol = new SimpleFillSymbolClass(); fillSymbol.Color = colori; uvRenderer.set_Symbol(0, i, (ISymbol)fillSymbol); return rasterRenderer; 第25页/共29页用RandomColorRamp获得随机颜色 int tableRows = raster

27、Table.RowCount(null); IRandomColorRamp colorRamp = new RandomColorRampClass();colorRamp.Size = tableRows;colorRamp.Seed = 100;bool createColorRamp;colorRamp.CreateRamp(out createColorRamp); fillSymbol.Color = colorRamp.get_Color(i);第26页/共29页RasterClassifyColorRampRenderer 针对连续值的栅格 Raster：IRasterLayer.Raster、IRasterDataset.CreateDefaultRaster() ClassCount，自动按NaturalBreaks方式计算Breaks进行分段，也可设为