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Dot density renderer
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Description
Create a dot density map showing corn production in the US.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</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.26/esri/css/esri.css">
<style>
html, body, #map {
height: 100%;
margin: 0;
}
#info {
position: absolute;
right: 0;
top: 0;
padding: 1em 1em 0 1em;
background: #fff;
font: 14px sans-serif;
width: 200px;
text-align: center;
border-radius: 0 0 0 10px;
}
</style>
<script src="https://js.arcgis.com/3.26/"></script>
<script>
var map;
require([
"esri/map", "esri/geometry/Extent",
"esri/layers/ArcGISTiledMapServiceLayer", "esri/layers/FeatureLayer",
"esri/InfoTemplate", "esri/renderers/DotDensityRenderer",
"esri/renderers/ScaleDependentRenderer", "esri/dijit/Legend",
"esri/Color", "dojo/_base/array", "dojo/dom", "dojo/domReady!"
], function(
Map, Extent,
ArcGISTiledMapServiceLayer, FeatureLayer,
InfoTemplate, DotDensityRenderer,
ScaleDependentRenderer, Legend,
Color, array, dom
) {
map = new Map("map", {
extent: new Extent({"xmin":-2460944,"ymin":-1389910,"xmax":2297115,"ymax":1643787,"spatialReference":{"wkid":102003}}),
maxScale: 5000000,
minScale: 20000000
});
var basemap = new ArcGISTiledMapServiceLayer("https://tiles.arcgis.com/tiles/nGt4QxSblgDfeJn9/arcgis/rest/services/Dark_Gray_Albers_North_America_Base/MapServer");
map.addLayer(basemap);
var layer = new FeatureLayer("https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/USA_County_Crops_2007/FeatureServer/0", {
outFields: ["STATE", "COUNTY", "M163_07"],
infoTemplate: new InfoTemplate("${COUNTY}, ${STATE}", "Corn Planted: ${M163_07:NumberFormat} Acres")
});
layer.setDefinitionExpression("M163_07>10000");
// update the alias for the field being mapped so it
// displays nicely in the legend
layer.on("load", function(e) {
array.forEach(e.layer.fields, function(field) {
if ( field.alias === "M163_07" ) {
field.alias = "Acres of Corn";
}
});
});
var renderer = new ScaleDependentRenderer({
rendererInfos: [{
renderer: new DotDensityRenderer({
fields: [{
name: "M163_07",
color: new Color("#CC8800")
}],
dotValue: 3200,
dotSize: 1
}),
maxScale: 17000000,
minScale: 20000001
}, {
renderer: new DotDensityRenderer({
fields: [{
name: "M163_07",
color: new Color("#CC8800")
}],
dotValue: 1600,
dotSize: 1
}),
maxScale: 8500000,
minScale: 17000000
}, {
renderer: new DotDensityRenderer({
fields: [{
name: "M163_07",
color: new Color("#CC8800")
}],
dotValue: 800,
dotSize: 1
}),
maxScale: 5000000,
minScale: 8500000
}]
});
layer.setRenderer(renderer);
map.addLayers([layer]);
var refLayer = new ArcGISTiledMapServiceLayer("https://tiles.arcgis.com/tiles/nGt4QxSblgDfeJn9/arcgis/rest/services/Dark_Gray_Albers_North_America_Reference/MapServer");
map.addLayer(refLayer);
map.on("layers-add-result", function(e) {
var corn = e.layers[0].layer;
var legend = new Legend({
map: map,
layerInfos: [{
layer: corn,
title: "US Corn Production (2007)"
}]
}, "legend");
legend.startup();
});
});
</script>
</head>
<body>
<div id="map"></div>
<div id="info">
<div id="legend"></div>
</div>
</body>
</html>