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BlendRenderer - Minority demographics
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Description
This sample demonstrates minority population concentrations throughout the United States. Red indicating Native American/Alaskan, green is Hispanic, blue represents African American, and pink/purple displays Asian concentrations. The more opaque the color, the higher the concentration for that demographic. More information on working with the BlendRenderer can be found here.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>BlendRenderer: United States minority population</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.29/dijit/themes/claro/claro.css">
<link rel="stylesheet" href="https://js.arcgis.com/3.29/esri/css/esri.css">
<style>
html, body, #map {
height: 100%;
margin: 0;
}
#meta {
position: absolute;
left: 20px;
bottom: 20px;
width: 20em;
height: 16em;
z-index: 40;
background: #ffffff;
color: #777777;
padding: 5px;
border: 2px solid #666666;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
font-family: arial;
font-size: 0.9em;
}
#meta h3 {
color: #666666;
font-size: 1.1em;
padding: 0px;
margin: 0px;
display: inline-block;
}
</style>
<script src="https://js.arcgis.com/3.29/"></script>
<script>
require([
"dojo/_base/array", "esri/Color", "esri/dijit/PopupTemplate", "esri/layers/ArcGISTiledMapServiceLayer", "esri/layers/FeatureLayer",
"esri/map", "esri/renderers/BlendRenderer",
"esri/symbols/SimpleFillSymbol", "esri/symbols/SimpleLineSymbol", "dojo/domReady!"
], function (array, Color, PopupTemplate, ArcGISTiledMapServiceLayer, FeatureLayer, Map, BlendRenderer, SimpleFillSymbol, SimpleLineSymbol){
var map = new Map("map", {
//basemap: "gray", //"topo"
center: [-100, 38],
zoom: 5
});
var tileLayer = new ArcGISTiledMapServiceLayer("https://tiles.arcgis.com/tiles/nzS0F0zdNLvs7nc8/arcgis/rest/services/US_Counties_basemap/MapServer ");
map.addLayer(tileLayer);
var layerUrl ="https://services.arcgis.com/P3ePLMYs2RVChkJx/arcgis/rest/services/USA_Counties_Generalized/FeatureServer/0";
//Create the PopupTemplate to be used to display demographic info
var template = new PopupTemplate({
"title": "{NAME} County, {STATE_NAME}",
"fieldInfos": [
{
"fieldName": "POP2010",
"label": "Population",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}, {
"fieldName": "POP10_SQMI",
"label": "Density, per sq. mi.",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}, {
"fieldName": "WHITE",
"label": "White",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}, {
"fieldName": "ASIAN",
"label": "Asian",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}, {
"fieldName": "BLACK",
"label": "African American",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}, {
"fieldName": "HISPANIC",
"label": "Hispanic",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}, {
"fieldName": "AMERI_ES",
"label": "Native American/Alaskan",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}
]
});
//Set the blendRenderer's parameters
var blendRendererOptions = {
blendMode: "darken", //By default, it uses "source-over", uncomment to display different mode
//See: http://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/globalCompositeOperation
symbol: new SimpleFillSymbol().setOutline(new SimpleLineSymbol().setWidth(0)),
fields: [
{
field: "AMERI_ES",
color: new Color([230, 0, 0])
}, {
field: "HISPANIC",
color: new Color([56, 168, 0])
}, {
field: "BLACK",
color: new Color([0, 169, 230])
}, {
field: "ASIAN",
color: new Color([255, 0, 197])
}
],
opacityStops: [
{
value: 0,
opacity: 0
},
{
value: .2,
opacity: .7
}
],
normalizationField: "POP2010"
};
renderer = new BlendRenderer(blendRendererOptions);
layer = new FeatureLayer(layerUrl, {
outFields: ["WHITE", "POP2010", "AMERI_ES", "HISPANIC", "BLACK", "ASIAN", "POP10_SQMI", "NAME", "STATE_NAME"],
opacity: 1,
infoTemplate: template
});
layer.setRenderer(renderer);
map.addLayer(layer);
});
</script>
</head>
<body class="claro">
<div data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design: 'headline',gutters:false" style="width: 100%; height: 100%; margin: 0;">
<div id="map" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region: 'center'">
<div id="meta">
<h3>Minority populations displayed using a BlendRenderer</h3>
<br>
<br>This sample demonstrates minority population concentrations throughout the United States.
<ul>
<li>Red: Native American/Alaskan</li>
<li>Pink/Purple: Asian</li>
<li>Blue: African American</li>
<li>Green: Hispanic</li>
</ul>
The more opaque the color, the higher the concentration for that demographic.
</div>
</div>
</div>
</body>
</html>