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Dot density with multiple classes
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Description
Show multiple classes on using a dot density renderer.Code
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
<title>Dot Density Renderer - Multiple Variables</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.26/esri/css/esri.css">
<style>
html, body, #map {
height: 100%;
margin: 0;
}
#map {
background-color: #000
}
#infopane {
position: absolute;
width: 300px;
top: 0;
right: 0;
background-color: rgba(0,0,0,0.75);
padding: 10px;
border-radius: 0 0 0 10px;
font-family: Segoe UI;
color: #aaa;
}
.esriLegendServiceLabel, #info-title {
font-weight: 600;
}
.hidden {
display: none;
}
#toggle-button {
cursor: pointer;
}
</style>
<script src="https://js.arcgis.com/3.26/"></script>
<script>
var map;
require([
"esri/map", "esri/geometry/Extent", "esri/layers/FeatureLayer", "esri/InfoTemplate", "esri/layers/ArcGISTiledMapServiceLayer",
"esri/renderers/SimpleRenderer", "esri/symbols/SimpleFillSymbol", "esri/symbols/SimpleLineSymbol", "esri/renderers/DotDensityRenderer", "esri/renderers/ScaleDependentRenderer",
"esri/Color", "dojo/query", "dojo/dom", "esri/dijit/Legend", "dojo/domReady!"
], function(Map, Extent, FeatureLayer, InfoTemplate, ArcGISTiledMapServiceLayer, SimpleRenderer, SimpleFillSymbol, SimpleLineSymbol, DotDensityRenderer, ScaleDependentRenderer, Color, query, dom, Legend) {
map = new Map("map", {
center: [-122.12, 37.60],
zoom: 10,
maxZoom: 12,
minZoom: 9
});
var basemap = new ArcGISTiledMapServiceLayer("https://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Base/MapServer", {
opacity: 0.15
});
map.addLayer(basemap);
var layer = new FeatureLayer("https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/BayAreaWorkingClasses/FeatureServer/0", {
outFields: ["CC","SC","WC","FFF"]
});
var createRenderer = function(dotValue) {
return new DotDensityRenderer({
fields: [{
name: "CC",
color: new Color([21, 137, 255])
}, {
name: "SC",
color: new Color([200, 111, 0])
}, {
name: "WC",
color: new Color([0, 255, 0])
}, {
name: "FFF",
color: new Color([255, 0, 0])
}],
dotValue: dotValue,
dotSize: 2,
outline: new SimpleLineSymbol("solid", new Color([50, 50, 50, 1]), 0.5),
legendOptions: {
valueUnit: "people",
backgroundColor: new Color([32, 32, 32])
}
});
};
var rendererInfos = [
{
renderer: createRenderer(400),
maxZoom: 9,
minZoom: 9
}, {
renderer: createRenderer(100),
maxZoom: 10,
minZoom: 10
}, {
renderer: createRenderer(25),
maxZoom: 11,
minZoom: 11
}, {
renderer: createRenderer(6),
maxZoom: 12,
minZoom: 12
}
];
var scaleDependentRenderer = new ScaleDependentRenderer({
rendererInfos: rendererInfos
});
layer.setRenderer(scaleDependentRenderer);
map.addLayer(layer);
var legend = new Legend({
map: map,
layerInfos: [{ layer: layer }]
}, "legend");
legend.startup();
dom.byId("toggle-button").onclick = function(){
query(".toggle-pane").toggleClass("hidden");
};
});
</script>
</head>
<body>
<div id="map"></div>
<div id="infopane">
<div id="toggle-button">[Toggle/expand information pane]</div>
<div class="toggle-pane">
<h1 id="info-title">Working Classes in Bay Area</h1>
<p>DotDensityRenderer provides a way to display multiple attributes for polygon features. A quantitative attribute is represented by dots randomly placed within a polygon.</p>
<p>The symbols on this map are scale-dependent. As you zoom in, the sizes of symbols are enlarged accordingly.</p>
<p>Four major working classes are rendered with four distinct colors. One can easily identity clusters by the relative richness of specific a color on the map.</p>
<div id="legend"></div>
</div>
</div>
</body>
</html>