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<!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: Los Angeles housing status</title>
    <link rel="stylesheet" href="http://js.arcgis.com/3.14/dijit/themes/claro/claro.css">
    <link rel="stylesheet" href="http://js.arcgis.com/3.14/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;
      }
      
      #blendSelect {
        position: fixed;
        z-index: 999;
        top: 10px;
        right: 10px;
        width: 150px;
      }
    </style>
    <script src="http://js.arcgis.com/3.14/"></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>Los Angeles housing status displayed using a BlendRenderer</h3>
            <br>
            <br>This sample displays housing status concentrations throughout the Greater Los Angeles area.
            <ul>
               <li>Red: Renter occupied</li>
               <li>Blue: Owner occupied</li>
               <li>Green: Vacant</li>
            </ul>
            The more opaque the color, the higher the concentration for that housing status.
         </div>
      </div>
    </div>
    <select id="blendSelect">
      <option value="source-over">source-over</option>
      <option value="source-in">source-in</option>
      <option value="source-out">source-out</option>
      <option value="source-atop">source-atop</option>
      <option value="destination-over">destination-over</option>
      <option value="destination-in">destination-in</option>
      <option value="destination-out">destination-out</option>
      <option value="destination-atop">destination-atop</option>
      <option value="lighter">lighter</option>
      <option value="copy">copy</option>
      <option value="xor">xor</option>
      <option value="overlay">overlay</option>
      <option value="normal">normal</option>
      <option value="multiply">multiply</option>
      <option value="screen">screen</option>
      <option value="darken">darken</option>
      <option value="lighten">lighten</option>
      <option value="color-dodge">color-dodge</option>
      <option value="color-burn">color-burn</option>
      <option value="hard-light">hard-light</option>
      <option value="soft-light">soft-light</option>
      <option value="difference">difference</option>
      <option value="exclusion">exclusion</option>
      <option value="hue">hue</option>
      <option value="saturation">saturation</option>
      <option value="color">color</option>
      <option value="luminosity">luminosity</option>
    </select>
  </body>
</html>
 
      require([
        "esri/Color", "esri/dijit/PopupTemplate", "esri/layers/FeatureLayer", "esri/map", "esri/renderers/BlendRenderer",
        "esri/symbols/SimpleFillSymbol", "esri/symbols/SimpleLineSymbol", "dojo/on", "dojo/domReady!"
      ], function (Color, PopupTemplate, FeatureLayer, Map, BlendRenderer, SimpleFillSymbol, SimpleLineSymbol, on){
​
        map = new Map("map", {
          basemap: "topo",
          center: [-118.40, 34.06],
          zoom: 15
        });
​
        //Set the blendRenderer's parameters
        var blendRendererParams = {
          //blendMode:"overlay" //By default, it uses "source-over", uncomment to display different mode
          //See: https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/globalCompositeOperation
          symbol: new SimpleFillSymbol().setOutline(new SimpleLineSymbol().setWidth(0)),
          fields: [
            {
              field: "OWNER_CY",
              label: "Owner Occupied",
              color: new Color([0, 0, 255])
            }, {
              field: "RENTER_CY",
              label: "Renter Occupied",
              color: new Color([255, 0, 0])
            }, {
              field: "VACANT_CY",
              label: "Vacant",
              color: new Color([0, 255, 0])
            }
          ],
          opacityStops: [
            {
              value: 0.1,
              opacity: 0
            },
            {
              value: 1,
              opacity: 0.7
            }
          ],
          normalizationField: "TOTHU_CY"
        };
​
        //Create the PopupTemplate to be used to display demographic info
        var template = new PopupTemplate({
          "title": "Housing Status by Census Block",
          "fieldInfos": [
            {
              "fieldName": "OWNER_CY",
              "label": "Number of Owner Occupied Houses",
              "visible": true,
              "format": {
                "places": 0,
                "digitSeparator": true
              }
            }, {
              "fieldName": "RENTER_CY",
              "label": "Number of Renter Occupied Houses",
              "visible": true,
              "format": {
                "places": 0,
                "digitSeparator": true
              }
            }, {
              "fieldName": "VACANT_CY",
              "label": "Number of Vacant Houses",
              "visible": true,
              "format": {
                "places": 0,
                "digitSeparator": true
              }
            }, {
              "fieldName": "TOTHU_CY",
              "label": "Total Housing Units",
              "visible": true,
              "format": {
                "places": 0,
                "digitSeparator": true
              }
            }
          ]
        });
​
        var layerUrl = "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Blocks%20near%20Wilshire%20enriched%20with%20Key%20Facts/FeatureServer/0";
​
        var renderer = new BlendRenderer(blendRendererParams);
​
        layer = new FeatureLayer(layerUrl, {
          id: "blendedLayer",
          outFields: ["TOTHU_CY", "RENTER_CY", "OWNER_CY", "VACANT_CY"],
          opacity: 1,
          definitionExpression: "TOTHU_CY > 0",
          infoTemplate: template
        });
​
        layer.setRenderer(renderer);
        map.addLayer(layer);
        
        on(document.getElementById("blendSelect"), "change", function(e) {
          renderer.setBlendMode(e.target.value);
          layer.redraw();
        });
​
      });
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