面积测量分析对象

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// create a AreaMeasurementAnalysis object and add it to the AnalysisLayer
const areaMeasurementAnalysis = new AreaMeasurementAnalysis();
view.analyses.add(areaMeasurementAnalysis);

view.when(() => {
  const hitTestLayers = view.map.layers.filter((layer) => layer.title === "Parcels");
  view.on("click", async (event) => {
    // remove the current measured geometry from the layer when the user clicks on the map
    areaMeasurementAnalysis.geometry = null;
    // get results only from the "Parcels" layer
    const hitTestResult = await view.hitTest(event, { include: hitTestLayers });
    if (hitTestResult.results.length > 0) {
      const geometry = hitTestResult.results[0].graphic.geometry;
      // pass the polygon geometry to the areaMeasurementAnalysis to display a new measurement
      areaMeasurementAnalysis.geometry = geometry;
    }
  });
});