LabelLayer

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LabelLayer是API 3.7以后引入的，为矢量要素提供客户端标注功能。

1、标注要素图层

var citiesSymbol = new TextSymbol().setColor(citiesColor);
citiesSymbol.font.setSize("18pt");
citiesSymbol.font.setFamily("arial");
citiesSymbol.yoffset = 4;
labels.addFeatureLayer(cities, new SimpleRenderer(citiesSymbol), "{CITY_NAME}");

2、分类标注

var citiesSymbolSmall = new TextSymbol().setColor(citiesColor);
citiesSymbolSmall.font.setSize("10pt");
citiesSymbolSmall.font.setFamily("arial");
citiesSymbolSmall.yoffset = 4;

var citiesSymbolLarge = new TextSymbol().setColor(citiesColor);
citiesSymbolLarge.font.setSize("14pt");
citiesSymbolLarge.font.setFamily("arial");
citiesSymbolLarge.yoffset = 4;

// 按城市级别分类渲染
var citiesRenderer = new ClassBreaksRenderer(null, "POP_RANK");
citiesRenderer.addBreak({
  minValue: 1,
  maxValue: 2,
  symbol: citiesSymbolLarge
});
citiesRenderer.addBreak({
  minValue: 2,
  maxValue: 3,
  symbol: citiesSymbolSmall
});
labels.addFeatureLayer(cities, citiesRenderer, "{CITY_NAME}");

3、按比例标注


var citiesLargeRenderer = new SimpleRenderer(citiesSymbolLarge);
var citiesScaleDependent = new ScaleDependentRenderer({
  rendererInfos: [{
    renderer: citiesSmallRenderer,
    minScale: 25000000,
    maxScale: 10000000
  }, {
    renderer: citiesLargeRenderer,
    minScale: 10000000,
    maxScale: 1
  }]
})
labels.addFeatureLayer(cities, citiesScaleDependent, "{CITY_NAME}");
暂写到这

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