cppccoa专题一怎样在应用中创建地图

MapXtremeforJava开发 专题一：怎样在应用中创建地 专题二：怎样操作地图---控制地图显 专题三：怎样进行空间特征值的搜 专题四：怎样对空间特征值对象编 专题五：怎样进行专题分 专题七：怎样实现GPS专题八：怎样调用空间数据库中的地 专题九：怎样快速响应多并发用户数据库数据请 专题十：怎样将影像图与矢量图进行叠 MapXtremeforJava开发三种WebGIS模式。MXTJMapXtremeServlet、MapJ、Renderers、DataProvidersMapXtremeServlet1提供栅格地图数据服务，2提供矢量地图数据服务，3提供图元文件数据服务（例:tab）；MapJMapxtremeAPI：1（例：地et响应的数据和；Renderer用来生成返回客户端地图数据的组件，有四种：LocalRenderer、MapXtremeImageRenderer、.Intra-ServletContainer positeRenderer。使用MapXtremeImageRender可以在产生地图图像，包含MapJ的应用程序和一个MapXtremeServlet实例通讯，产生地图图像；LocalRender将地图输出为Java2DGraphics2D对象，所有的Render在客户端产生，也即所谓地图的矢量传输方式；使用IntraServletContainerRenderer不需socketconnection，从而MapXtremeSevlet将地图直接传回给客户端；CompositeRenderer将地图分为动态与静态图层，当需要更新地图时，可只更新动态图层，DataProviderLayer（图层）对象的内部对象，它不是直接由用户创建的，但是它的描述是对图层的DataProvider：TableDescHelper–描述数据；DataProviderHelper–定义数据的源；ataProviderRef–描述获取数据的方式。Map步骤： 创建MapJ 设图尺 生成 myMap=new GeoSet（*.gst）MapDefinition（*.mdf）文件加载地图数据。MapXtrememyMap.loadGeoset(geosetName,dataDir,geosetName：geoset（包括路径dataDir：geoset中的tab地图文件的位置 URLNULL 加载MapMapDefContainer，有两种情况：MapDefContainermdc=newMapDefContainermdc=newMapDefContainermdc=newJDBCMapDefContainer(driver,url,use其中，driver,url,user,passwordOracleSpatialMapRefContainer，地图定义保存在数据库的表中：OraSoMapDefContainermdc=

newOraSoMapDefContainer("oracle.jdbc.driver.OracleDriver","jdbc:oracle:thin:@machinename:"username","password","tableName","Name",myMap.loadMapDefinition(mapDefContainer,name)name是地图定义的名字，如：myMap.loadMapDefinition(mdc, myMap.setDeviceBounds(newDoubleRect(0,0,800, 生成生成需要一下几步 StringmapxtremeServletUrl= 创 poser poser.create(myMap,256,表示是256色背景为蓝色的GIF图 MapXtremeImageRendererrenderernew 生成toStream,toImage如果使用MapJ直接获取地图数据并生成，则使用LocalRender而不是MapXtremeImageRender。MapXtremeImageRenderLocalRender专题二：怎样操作地图---设图视野zoom//Assumingthatthecurrentdistanceunitsarekilometers,thiscommandwillsetthe//mapzoomto500kilometers.设图中设图中心的方法是setCenter()//Pointscreenpoint=new//worldpoint=//设图中设图边DoubleRectbounds=newDoubleRect(-180,-90,180,90);DoubleRectbounds=newDoubleRect(newDoublePoint(0,0),360,180);设图投坐标数据在server\mapinfow.prj文件中,包含上百种投影。PRJStringcsProj=newString("\"AzimuthalEquidistant(NorthPole)\",5,62,7,0,0,CoordSysts=CoordSys.createFromPRJ(csProj);也可以用createFromMapBasicMapBasic字符串来设置投影distUnit=LinearUnit.kilometer;DataProviderSearch有时可能做一些搜索，如搜索配送中心周围的零售店。MapXtreme提供了丰富的搜索功能。搜索的结果可以转换为被选中状态，从而显示在地图上。Search是Layer对象的方法，有：Vector//AssumemyLayerisaLayerTableInfomyTableInfo=myLayer.getTableInfo();VectorcolumnNames=newVector();intcolumnCount=myTableInfo.getColumnCount();Stringcol;for(intj=0;j<columnCount;{col=myTableInfo.getColumnName(j);}tion，PrimaryKey，rasterDataQueryParams类来过滤这些信息，以提高程序的性QueryParamsqp=newQueryParams(bGeometry,bRendition,bPrimarykey,bLabelPoint,bRasterInfo,bLabelRendition,SearchType.entire);//findallFeaturesentirelywithinagivensearchregion,returnasingleAttributecolumn//andnoRenditioninformation.Vectorcols=newFeaturesearchFeature =mapj.getFeatureFactory().createRegion(points,rend,attribs,nulQueryParamsqueryParams=newQueryParams(true,false,true,true,true,true,SearchTFeatureSetfs=layer.searchWithinRegion(cols,searchFeature.getGeometry(), Search //AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthecolumns//tobereturned.AssumeqpistheQueryParamsobject.AssumemyLayerisaLayer//object.{fs=}catch(exception{}//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthedesired//columns tobereturned.AssumeqpistheQueryParamsobject.AssumemyLayer//isaLayerobject.DoublePointdblPt=newDoublePoint(-73.889444,42.765555);doubledRadius=10.03;{fs=myLayer.searchWithinRadius(columnNames,dblPt,dRadius,LinearUnit.}catch(exception{}==>privateboolean{//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthecolumns//tobe returned.AssumeqpistheQueryParamsobject.AssumemyLayerisaLayer//object.AssumevGeomisaVectorGeometryofTYPE_REGION{fs}catch(Exception{returnfalse;}return}==>//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthecolumns//tobereturned.AssumeqpistheQueryParamsobject.AssumemyLayerisaLayer//object.DoubleRectdRect=newDoubleRect(-74.092662,42.765555,-73.668898,42.856420);{fs}catch(exception{}//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthecolumns//tobereturned.AssumeqpistheQueryParamsobject.AssumemyLayerisaLayer//object.DoublePointdp=newDoublePoint(12.3456,-67.890);{fs=}catch(exception{}==>//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthecolumnsto//be returned.AssumeqpistheQueryParamsobject.AssumemyLayerisaLayer//object.Assumeattristheattributetosearchagainst.AssumecolNameisthecolumnto//searchagainst.{fs}catch(Exception{return}privatebooleanlayerSearchByPrimaryKey(){//AssumefsisaFeatureSetobject.AssumecolumnNamesisavectorofthe//columnstobereturned.AssumeqpistheQueryParamsobject.AssumemyLayer//isaLayerobject.AssumecolNameisthecolumntosearchagainst.Assumepkisa//PrimaryKeyfromaprevioussearch.PrimaryKey[]arraypk=newPrimaryKey[1];arraypk[0]=pk;{fs=}catch(Exception{returnfalse;}return}}eatureFactoryFeaturesearchFeatureSet。AnnotationAnnotationtMapJ，AnnotatinFeaturePrimaryKeyAnnotationFeatureFeatureFactoryFeatureMapJNumericCoordSys。JDBCMapXtremeJavarollback。addFeatureSet，FeaturesFeatureFeatureFeaturePrimaryKeyOracle8iSpatial，IUSwithSpatialWareDataBlade和DB2withSpatialwareExtender1）Oracle8iPrimaryKey1n；FeaturePrimaryKey，FeaturePrimaryKey2）IUSwithSpatialWareDataBladeIUSSW_MEMBERPrimaryKey;PrimaryKey1到n；使用addFeature和receFeature时都不用指定PrimaryKey，即使指定了，也被忽略addFeature时不会返回PrimaryKey。3）DB2withSpatialExtenderPrimaryKeyExtenderPrimaryKey1n；使用addFeature和receFeature时都不用指定PrimaryKey，即使指定了，也被忽略；PrimaryKey，PrimaryaddFeaturePrimaryKey投影进行，TableDescHelperFeatureRendition或LabelRendition的字段，MapXtremeMapXtremeRendtionRenditionType.mapxtremeRenditionType.mapbasicFeature（addFeature）时，如果Rendition字段的类型是RenditionType.mapbasic,保存时该字段将是null若使用receFeature，MapXtremeJava RangedTheme：按数据将地图分组调整显 RangedThemeIndividualvalueThemeAddThemeBeanRenditionOverrideTheme，//AssumemyLayerisaLayer//AssumemyRendisaRenditionOverrideThememyOTheme=newOverrideTheme(myRend,"MyTheme");//AssumelayerasaLayerobjectVectorv=newVector();DoublePointdp=newDoublePoint(x,y);FeatureSetfs=null;//Selectafeatureatthespecifiedlocationfs=layer.searchAtPoint(v,dp,null);//CreateaSelectionThemeselTheme=new//CreateaSelectionobject,andaddtheselectedfeaturesSelectionsel=newSelection();//AssigntheSelectionobjecttotheSelectionTheme//AssignthedisystyleoftheSelectionThemeRenditionrend=RenditionImpl.getDefaultRendition();rend.setvalue(Rendition.FILL,Color.red);//AddtheSelectionThemetothelayer'slistofthemes显示。MapXtremeLayerRenditionyellow=RenditionImpl.getDefaultRendition();Renditionred=RenditionImpl.getDefaultRendition();lyr=m_map.getLayers().getLayer("States.tab");StringcolName="Pop_1990";ColumnStatisticscolStats//SetnumberofbreaksfordataintnumBreaks=5;//Computethedistributionofdatawith5breaks//EqualVectorrBreaks= //Setuparedandayellowrenditionand//spreadthecolorsyellow.setvalue(Rendition.FILL,Color.yellow);yellow.setvalue(Rendition.STROKE_WIDTH,2);red.setvalue(Rendition.FILL,Color.red);red.setvalue(Rendition.STROKE_WIDTH,4);Vectorrends=LinearRenditionSpreader.spread(numBreaks,yellow,//CreateThemeRangedThemerTheme=newRangedTheme(colName,rBreaks,rends,"StatesbyPop_1990//GetThemeListclassobjectThemeList//AddthemetoLayersthemeListfetchColumnStatisticsColumnStatisticsBucketerColumnStatisticsisticsDISTRIBUTION_TYPE_EQUAL_COUNT（等个数DISTRIBUTION_TYPE_EQUAL_RANGES（等范围DISTRIBUTION_TYPE_STANDARD_DEVIATION（标准差）：以中间值为中心将范围上标准差分布ditionVector。RangedThemeRendition，//SetuptheVectorrBreaks=newVector();rBreaks.addElement(newAttribute(1));rBreaks.addElement(newAttribute(5));rBreaks.addElement(new//SetuptherenditionsVectorrends=newVector();//CreatearangedthemeRangedThemerTheme=newRangedTheme(themeCol,rBreaks,rends,"Statesby//Assignthemetolayersaselement1//Drawthe//Create poser poser.create(myMap,256,//CreateaMapXtremeImageRendererrenderer=newMapXtremeImageRenderer("//Renderthemap//Renderthemaptothefile//getareferencetothelayerwewillbeapplyingthemetolyr=lyrs.add(dpr,ttdh,"Territories");//createanewthemeIndividualvalueThemeiValThm=newIndividualvalueTheme("CoverageTerritory","SalesCoverageBreakdown");//createaRendition//assigncolortorenditionaddnrend.setvalue(Rendition.FILL,iValThm.add(newAttribute("SouthWest"),//assigncolortorenditionaddattributerend.setvalue(Rendition.FILL,iValThm.add(newAttribute("SouthEast"),//assigncolortorenditionaddattributerend.setvalue(Rendition.FILL,iValThm.add(newAttribute("Central"),//Addthethemetolayersthemelist//StorecolumnnameandtypeinHashtableht=newHashtable();//Createnewlegendpassingthemeandhashtable.ThesetThemeTitle.IndividualvalueThemeLegendiValThmLeg;iValThmLeg=newIndividualvalueThemeLegend(iValThm,ht);iValThmLeg.setTitle("CovergeTerritorylegend");//GenerategifimagefromlegendiValThmLeg.toFile("c:\\temp\\terrLeg.gif","image/gif");theme.setLegend。ThemerendsasaRenditioncolNameasarBreaksasabreakPointsRangedThemerTheme=newRangedTheme(colName,rBreaks,rends,"Statesby//CreateadefaultRangedThemeLegendrThmLeg//OR,Createathemelegendinstanceusingthemeandsetting//AddthemesettingstohashtableHashtableht=newHashtable();RangedThemeLegendrThmLeg=newRangedThemeLegend(rTheme,ht);//SetlegendtitlerThmLeg.setTitle("RangedThemelegend");//sendlegendtoimagefilerThmLeg.toFile("c:\\temp\\rangeLeg.gif","image/gif");LegendContainerBeanVisualMapJBean如果专题图改变，LegendContainerBeannfo.legend.CatographicLegend//AssumemapJisalreadyLayerlandmarks=//createthelegendwithtitle"StateLandmarks"CartographicLegendlegend=newCartographicLegend("Staandmarks");//PerformasearchAll()onthelayertogetits//FeatureSet-needtomakesurewefetchthecolumn//wewanttolabelwithinthelegendVectorcolumns=newVector();FeatureSetfs=landmarks.searchAll(columns,//addtheFeatureSettothelegend,andspecifythat//wanttolabeleachfeature'srenditionwiththevalueinthe"Name"columnlegend.addFeatureSet(fs,"Name");//alwaysdisposeofFeatureSetonceyou'redonewithAddThemeBeanVisualMapJAddThemeBeansetVisualMapJ(VisualMapJ)来指定。BeanDataBindingDataProviderHelper，DataBindingDataProviderHelperLayersTABDataProviderHelpertabDPH=newJDBCDataProviderHelperjdbcDPH=newJDBCDataProviderHelper("jdbc:oracle:thin:@localhost:1521:sid",user,pass,"oracle.jdbc.driver.OracleDriver");DataBindingDataProviderHelperdbDPH=newDataBindingDataProviderHelper(tabDPH,jdbcDPStringtabCols=StringjdbcCols=TABTableDescHelpertabDesc=newJDBCTableDescHelperjdbcDesc=newJDBCTableDescHelper("STATES",null,DataBindingTableDescHelperdbDesc=newDataBindingTableDescHelper(tabDesc,jdbcDesc,tabCols,jdbcCols);DataProviderRefdpRef=newMapXtremeDataProviderRef(dbDPH,mapXtremeURL);Layerlyr=mapj.getLayers().add(dpRef,dbDesc,"DataBinding");sumcountaverage求平均 um求最大MapXtremeCompositeRender。通过它可以仅仅将某些需要改变的图层重画刷创建一个临时图层（Annotaion）CompositeRender车辆象GPS之类的应用，可以将地图绘制一次，每次GPS数据更新时，只重画车辆的位置CompositeRender640x4802.7tryThemapjisoftypeMapJandhasloadedaThereqisoftypeTheresisoftypeThedpisoftype//Addannotationlayer-thislayerwillconsistofoneimagesymbolto"animAnnotationTableDescHelperatdh=newAnnotationTableDescHelper("Animation_Layer");AnnotationDataProviderHelperadph=newAnnotationDataProviderHelper();LocalDataProviderRefldpr=newLocalDataProviderRef(adph);//AddtheannotationLayeranimate_layer=mapj.getLayers().insert(ldpr,atdh,0,//CreatetherenditionfortheRenditionr=RenditionImpl.getDefaultRendition();r.setvalue(Rendition.SYMBOL_URL,"file:///C:/images/car.gif");//CreatetheFeatureFactoryff=//AnarraycontainingasingleintAttributeAttribute[]aAIntAttribute={newAttribute(33)};//createanewPrimaryKeyananintegerPrimaryKeypkey=newPrimaryKey(aAIntAttribute);Featuref=ff.createPoint(dp,r,aAIntAttribute,pkey);PrimaryKeypk=animate_layer.addFeature(f);//Create poser poser.create(mapj,256,CreatethecompositerendererRendertheimageStreamtheimagebacktotheCompositeRenderercompositeRenderer=newCompositeRenderer("pxtreme40/servlet/mapxtreme";,0);ServletOutputStreamsos=res.getOutputStream();//Setthisattributetofalsesothatthebottomimageisnotrenderednextti}catch(Exceptione)//Takeappropriateerrorhandling}在地图中添加空间地图图层首先要定义LayerLayerDataProvider。LayerDataProvider，它不是直接由用户创建的，但是它的描述确实定义一DataProviderTableDescHelper–DataProviderHelper–DataProviderRef–MapXtreme提供一系列DataProvider，可以如下类型的数据MapInfotabformatOracle8iwithSpatialInformixUniversalServerSpatialWareDB2SpatialWareJDBCcompatibletablescontaininglongitudeandlatitudeGeoTIFFandMIGridShapefilesDataBindingAnnotationMapXtreme不同数据的示意图 s如：MapInfoTable需要使用TABTableDescHelper，需要table名字参数。对于Oracle8i数据OraSoTableDescHelper，需要表名或SQL 的数据源，源就是.tab。Oracle8iOraSoDataProviderHelper Provider由MapXtremeServlet创建。所有数据的组件可以放在中间层MapXtremeServlet处，这样客户端就不必都安装JDBC驱动。这是一个典型的三次应用：应用，数据处理逻辑，数据。注意：何时数据rgetTableInfo，searchrenderLayers.addLayers.insertDataProviderHelpersDataSourceMapInfoTablesOracle8iwithSpatialOptionInformixUniversalServerSpatialWareDataBladeDB2SpatialWareExtenderJDBCcompatibletablescontaininglongitudeandlatitudecolumnsAnnotationLayersGeoTIFFRasterShapefilesDataBinding1ImageIO**Oracle8iOracle8iDataProvider//specifytheurltotheMapXtremeservletwhichremoyconnectsustothemap//engineStringmapXtremeURL= //CreatetheRemoteDataproviderneededtoaccessthe//Usingpooledconnections mended)//UsingDatabasespecificOraSoDataProviderHelperoraSoDPHelper=newOraSoDataProviderHelper("databasename",1000,"DBsid","tester","tester",DriverType.thin);//CreateaStringarraywiththename(s)ofthecolumn(s)touseasauniquekeyforrecordsintheTableNameString[]idColumn=//NowcreateaTableDesc//ThiscodeusestheConstructorrequiredwhenusingaOraSoTableDescHelperoraSoTDHelper=newOraSoTableDescHelper("STATES",false,idColumn,"S_GEOMETRY",null,RenditionType.none,null,RenditionType.none,CoordSys.longLatWGS84,//ThiscodeusestheConstructorrequiredwhenusingaQueryOraSoTableDescHelperoraSoTDHelper=newOraSoTableDescHelper("SelectS_MEMBER,S_GEOMETRY,POP_1990FromSTATESWhereSTATE='NY'",idColumn,"S_GEOMETRY",null,RenditionType.none,null,RenditionType.none,CoordSys.longLatWGS84,2);//CreatetheRemoteDataproviderneededtoaccesstheMapXtremeDataProviderRefmxtDPRef=newMapXtremeDataProviderRef(oraSoDPHelper,mapXtre//assignittoMapJ-notegetLayers()m_myMap.getLayers().add(mxtDP