mapxtreme_mapxtreme最新版_arcgis engine(8)

//CreateaSelectionobject,andaddtheselectedfeatures

Selectionsel=newSelection();

sel.add(fs);

//AssigntheSelectionobjecttotheSelectionTheme

selTheme.setSelection(sel);

//AssignthedisplaystyleoftheSelectionTheme

Renditionrend=RenditionImpl.getDefaultRendition();

rend.setvalue(Rendition.FILL,Color.red);

selTheme.setRendition(rend);

//AddtheSelectionThemetothelayerslistofthemes

layer.getThemeList().add(selTheme)

3RangedTheme

范围专题根据图层中数据的数值分成几个范围，然后将图元分为几组，每组有一个Rendition控制图元的显示。MapXtreme提供了一系列的对象用来控制范围专题。

下面先介绍一个示例，然后介绍和范围专题相关的对象：

示例：

Layerlyr=null;

Renditionyellow=RenditionImpl.getDefaultRendition();

Renditionred=RenditionImpl.getDefaultRendition();

lyr=m_map.getLayers().getLayer("States.tab");

StringcolName="Pop_1990";

ColumnStatisticscolStats=lyr.fetchColumnStatistics(colName);

//Setnumberofbreaksfordata

intnumBreaks=5;

//Computethedistributionofdatawith5breaksand

//EqualRanges

VectorrBreaks=Bucketer.computeDistribution(numBreaks,colStats,Bucketer.DISTRIBUTION_TYPE_EQUAL_RANGES);

//Setuparedandayellowrenditionandthen

//spreadthecolors

yellow.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,red);

//CreateThemeobject

RangedThemerTheme=newRangedTheme(colName,rBreaks,rends,"StatesbyPop_1990");

//GetThemeListclassobject

ThemeListtList=lyr.getThemeList();

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