ArcEngine開發(fā)入門2課件

地圖加載和顯示控制圖層ILayer：所有圖層IFeatureLayer：矢量要素圖層，繼承ILayerIGeoFeatureLayer：提供矢量要素圖層的符號(hào)化和標(biāo)注支持，繼承IFeatureLayerIRasterLayer：柵格圖層，繼承ILayerMapControl的圖層管理AddLayer(layer,index)AddLayerFrom,index)AddShape,)DeleteLayer(index)MoveLayerTo(fromIndex,toIndex)get_Layer(index)LayerCountvoidAddShape(stringshapeFolder,stringshapeFile){IWorkspaceFactorywsf=newShape();IFeatureWorkspacews=wsf.OpenFrom,0)asIFeatureWorkspace;IFeatureClassfc=ws.OpenFeatureClass(shapeFile);IFeatureLayerlayer=newFeatureLayerClass();layer.FeatureClass=fc;layer.Name=(fcasIDataset).Name;m_mapControl.AddLayer(layer,0);}添加?xùn)鸥駡D層voidAddRaster(stringrasterFolder,stringrasterFile){ IRasterLayerlayer=newRasterLayerClass();layer.CreateFrom(rasterFolder+"\\"+rasterFile);layer.Name=rasterFile;m_mapControl.AddLayer(layer,0);}voidAddRaster(stringfolderName,stringdatasetName){ IWorkspaceFactoryworkspaceFactory=newRasterWorkspaceFactoryClass(); IRasterWorkspacerasterWorkspace=(IRasterWorkspace)workspaceFactory.OpenFrom,0); IRasterDatasetrasterDataset=rasterWorkspace.OpenRasterDataset(datasetName); IRasterLayerrasterLayer=newRasterLayerClass(); rasterLayer.CreateFromDataset(rasterDataset); m_mapControl.AddLayer(layer,0);}圖層的Visible控制ILayer.Visible幾何圖形IGeometry：幾何圖形IPoint：點(diǎn)狀圖形，繼承IGeometryIEnvelope：矩形，繼承IGeometryIPolygon：多邊形，繼承IGeometryIPolyline：線，繼承IGeometry符號(hào)ISymbol：符號(hào)IMarkerSymbol：點(diǎn)狀符號(hào)ILineSymbol：線狀符號(hào)（線型）IFillSymbol：填充符號(hào)（填充圖案）SimpleLineSymbolpublicISimpleLineSymbolCreateSimpleLineSymbol(IRgbColorrgbColor,doubleinWidth,esriSimpleLineStyleinStyle){if(rgbColor==null){returnnull;}

ISimpleLineSymbolsimpleLineSymbol=newSimpleLineSymbolClass();simpleLineSymbol.Style=inStyle;simpleLineSymbol.Color=rgbColor;simpleLineSymbol.Width=inWidth;

returnsimpleLineSymbol;}SimpleFillSymbolpublicISimpleFillSymbolCreateSimpleFillSymbol(IRgbColorfillColor,esriSimpleFillStylefillStyle,IRgbColorborderColor,esriSimpleLineStyleborderStyle,doubleborderWidth){

if(fillColor==null||fillStyle==null||borderColor==null||borderStyle==null){returnnull;}ISimpleLineSymbolsimpleLineSymbol=newSimpleLineSymbolClass();simpleLineSymbol.Width=borderWidth;simpleLineSymbol.Color=borderColor;simpleLineSymbol.Style=borderStyle;ISimpleFillSymbolsimpleFillSymbol=newSimpleFillSymbolClass();simpleFillSymbol.Outline=simpleLineSymbol;simpleFillSymbol.Style=fillStyle;simpleFillSymbol.Color=fillColor;returnsimpleFillSymbol;}矢量圖層渲染矢量圖層： IFeatureRendererIGeoFeatureLayer.Renderer;設(shè)置新的Renderer后刷新

layer.Renderer=renderer;m_mapControl.ActiveView.Refresh();m_tocControl.Update();SimpleRenderer所有要素采用相同的渲染方式根據(jù)圖層的要素類型創(chuàng)建一個(gè)SymbolvoidSetFeatureLayerSimpleRenderer(IFeatureLayerlayer,IColoroutlineColor, IColorfillColor){ISimpleRendererpRender=newSimpleRendererClass();ISimpleFillSymbolsymd=newSimpleFillSymbolClass();symd.Style=esriSimpleFillStyle.esriSFSSolid; symd.Color=fillColor; pRender.Symbol=symdasISymbol;(layerasIGeoFeatureLayer).Renderer=pRenderasIFeatureRenderer;}UniqueValueRenderer字段：至少一個(gè)，離散類型，一般式整數(shù)或字符串有限的字段值每個(gè)字段值對(duì)應(yīng)的Symbol每個(gè)字段值對(duì)應(yīng)的LabelDefaultSymbolClassBreaksRenderer字段：必須是數(shù)值類型MinimumBreak：最小分段值Breaks：分段值（不含MinimumBreak），需要n個(gè)每段對(duì)應(yīng)的Symbol每段對(duì)應(yīng)的Label可用AlgorithmicColorRamp來設(shè)置漸變顏色

IClassBreaksRendererCreateClassBreaksRenderer(stringfield,double[]breaks,IColor[]colors){IClassBreaksRendererpRender=newClassBreaksRendererClass();pRender.Field=field;pRender.BreakCount=breaks.Length-1;pRender.MinimumBreak=breaks[0];

for(inti=0;i<breaks.Length-1;i++){pRender.set_Break(i,breaks[i+1]);pRender.set_Label(i,string.Format("{0}-{1}", breaks[i],breaks[i+1]));IFillSymbolpSimpleFillSym=newSimpleFillSymbolClass();pSimpleFillSym.Color=colors[i];pRender.set_Symbol(i,pSimpleFillSymasISymbol);}returnpRender; }用AlgorithmicColorRamp獲得漸變顏色

IAlgorithmicColorRamppColorRamp=newAlgorithmicColorRamp();pColorRamp.Algorithm=esriColorRampAlgorithm.esriCIELabAlgorithm;IRgbColorpColor1=newRgbColorClass();IRgbColorpColor2=newRgbColorClass();pColor1.Red=255;pColor1.Green=210;pColor1.Blue=210;pColor2.Red=190;pColor2.Green=0;pColor2.Blue=170;pColorRamp.FromColor=pColor1;pColorRamp.ToColor=pColor2;pColorRamp.Size=breaks.Length;

boolok;pColorRamp.CreateRamp(outok);IEnumColorspEnumColors=pColorRamp.Colors;pEnumColors.Reset();。。。

pSimpleFillSym.Color=pEnumColors.Next();。。。IRasterRendererIRasterUniqueValueRenderer：唯一值分類渲染IRasterClassifyColorRampRenderer：連續(xù)值分級(jí)渲染IRasterRGBRenderer：RGB渲染，指定R、G、B波段RasterUniqueValueRenderer一般針對(duì)有RasterAttributeTable的柵格RAT:OID、VALUE、COUNT、用戶字段(optional)Raster：IRasterLayer.Raster、IRasterDataset.CreateDefaultRaster()字段字段值：從RAT來每個(gè)字段值對(duì)應(yīng)的符號(hào)（FillSymbol）每個(gè)字段值對(duì)應(yīng)的Label可用RandomColorRamp獲得隨機(jī)顏色RasterClassifyColorRampRenderer針對(duì)連續(xù)值的柵格Raster：IRasterLayer.Raster、IRasterDataset.CreateDefaultRaster()ClassCount，自動(dòng)按NaturalBreaks方式計(jì)算Breaks進(jìn)行分段，也可設(shè)為其他方式或者直接設(shè)置Break值。每段對(duì)應(yīng)的符號(hào)（FillSymbol）每段對(duì)應(yīng)的Label可使用AlgorithmicColorRamp獲得漸變顏色publicIRasterRendererClassifyRenderer(IRasterLayerrasterLayer){ IRasterClassifyColorRampRendererclassifyRenderer=newRasterClassifyColorRampRendererClass();IRasterRendererrasterRenderer=(IRasterRenderer)classifyRenderer;IRasterraster=rasterLayer.Raster;r