WebGL已经开启了,但是热力图渲染FeatureLayer还是没有效果。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Data-driven continuous color - 4.8</title>
<link rel="stylesheet" href="http://localhost/arcgis_js_api/library/4.8/esri/css/main.css">
<script>
var dojoConfig = {
has: {
"esri-featurelayer-webgl": 1
}
}
</script>
<script src="http://localhost/arcgis_js_api/library/4.8/init.js"></script>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<script>
require([
"esri/Map",
"esri/views/MapView",
"esri/layers/FeatureLayer",
"esri/widgets/Legend",
"esri/geometry/Point",
"esri/Graphic",
"esri/tasks/support/Query",
"esri/tasks/QueryTask",
"esri/renderers/HeatmapRenderer",
"dojo/domReady!"
], function (
Map, MapView, FeatureLayer, Legend, Point, Graphic, Query, QueryTask, HeatmapRenderer,
) {
var map = new Map({
basemap: "streets"
});
var view = new MapView({
container: "viewDiv",
map: map,
center: [-110.050200, 40.125524],
zoom: 4
});
var renderer = {
type: "heatmap",
field: "Value",
colorStops: [
{ ratio: 0, color: "rgba(255, 255, 255, 0)" },
{ ratio: 0.2, color: "rgba(255, 255, 255, 1)" },
{ ratio: 0.5, color: "rgba(255, 140, 0, 1)" },
{ ratio: 0.8, color: "rgba(255, 140, 0, 1)" },
{ ratio: 1, color: "rgba(255, 0, 0, 1)" }
],
minPixelIntensity: 0,
maxPixelIntensity: 10
};
var featureLayer = new FeatureLayer({
fields: [{
name: "ObjectID",
alias: "ObjectID",
type: "oid"
}, {
name: "Value",
alias: "Value",
type: "double"
}],
objectIdField: "ObjectID",
geometryType: "point",
spatialReference: { wkid: 4326 },
renderer: renderer ,
source: [{
geometry: new Point({
x: -120,
y: 40
}),
attributes: {
ObjectID: 1,
Value: 2
}
},
{
geometry: new Point({
x: -100,
y: 38
}),
attributes: {
ObjectID: 2,
Value: 3
}
}
],
});
map.add(featureLayer);
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>