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HTML

              
                <!DOCTYPE html>
<html>
<head>
    <title>Heat Map Layer Options - Azure Maps Web Control Samples</title>

    <!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
    <link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
    <script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>

    <script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/1717245/clipboard.min.js"></script>
</head>
<body onload="GetMap()">
    <fieldset class="sidePanel">
        <legend>Heat Map Layer Options</legend>
        This sample shows how the different options of the heat map layer affect rendering.
        <br /><br />

        <div class="tab">
            <button class="tablinks active" onclick="openTab(this, 'StyleOptions')">Base Options</button>
            <button class="tablinks" onclick="openTab(this, 'LayerOptions')">Layer Options</button>
            <button class="tablinks" onclick="openTab(this, 'Code')">Code</button>
        </div>

        <div id="StyleOptions" class="tabcontent" style="display:block;">
            <table>
                <tr title="An integer specifying the minimum zoom level to render the layer at.">
                    <td>Min Zoom:</td>
                    <td>
                        <form oninput="minz.value=MinZoom.value">
                            <input type="range" id="MinZoom" value="0" min="0" max="24" step="1" oninput="updateHeatMapLayer()" onchange="updateHeatMapLayer()" />
                            <output name="minz" for="MinZoom">0</output>
                        </form>
                    </td>
                </tr>
                <tr title="An integer specifying the maximum zoom level to render the layer at.">
                    <td>Max Zoom:</td>
                    <td>
                        <form oninput="maxz.value=MaxZoom.value">
                            <input type="range" id="MaxZoom" value="24" min="0" max="24" step="1" oninput="updateHeatMapLayer()" onchange="updateHeatMapLayer()" />
                            <output name="maxz" for="MaxZoom">24</output>
                        </form>
                    </td>
                </tr>
                <tr title="Specifies if the layer is visible or not.">
                    <td>Visible:</td>
                    <td><input id="Visible" type="checkbox" onclick="updateHeatMapLayer()" checked="checked" /></td>
                </tr>
            </table>

            <p>
                In addition to the options in this tool, the HeatMapLayer also has options for;
                <ul>
                    <li>sourceLayer - used with VectorTileSource.</li>
                </ul>
                Many options in this layer also support Expressions which are not demonstrated in this sample.
            </p>
        </div>

        <div id="LayerOptions" class="tabcontent">
            <table>
                <tr title="The color gradient expression to colorize the heat map.">
                    <td>Heat Gradient:</td>
                    <td>
                        <div class="dropdown">
                            <button id="gradientDropdownBtn" onclick="toggleGradientDropdown()" class="dropbtn"></button>
                            <div id="gradientDropdown" class="dropdown-content">
                            </div>
                        </div>
                    </td>
                </tr>
                <tr title="The radius in pixels used to render a data point on the heatmap. The radius must be a number greater or equal to 1.">
                    <td>Radius</td>
                    <td>
                        <form oninput="radius.value=Radius.value">
                            <input type="range" id="Radius" value="10" min="1" max="100" step="1" oninput="updateHeatMapLayer()" onchange="updateHeatMapLayer()" />
                            <output name="radius" for="Radius">10</output>
                        </form>
                    </td>
                </tr>
                <tr title="The opacity at which the heatmap layer will be rendered defined as a number between 0 and 1.">
                    <td>Opacity</td>
                    <td>
                        <form oninput="opacity.value=Opacity.value">
                            <input type="range" id="Opacity" value="1" min="0" max="1" step="0.1" oninput="updateHeatMapLayer()" onchange="updateHeatMapLayer()" />
                            <output name="opacity" for="Opacity">1</output>
                        </form>
                    </td>
                </tr>
                <tr title="Similar to heatmap-weight but specifies the global heatmap intensity. The higher this value is, the more ‘weight’ each point will contribute to the appearance.">
                    <td>Intensity</td>
                    <td>
                        <form oninput="intensity.value=Intensity.value">
                            <input type="range" id="Intensity" value="1" min="0" max="5" step="0.02" oninput="updateHeatMapLayer()" onchange="updateHeatMapLayer()" />
                            <output name="intensity" for="Intensity">1</output>
                        </form>
                    </td>
                </tr>
                <tr title="Specifies how much an individual data point contributes to the heatmap. Must be a number greater than 0. A value of 5 would be equivalent to having 5 points of weight 1 in the same spot. This is useful when clustering points to allow heatmap rendering or large datasets.">
                    <td>Weight</td>
                    <td>
                        <input id="Weight" type="checkbox" onclick="updateHeatMapLayer()"/> base on "mag" property
                    </td>
                </tr>
            </table>
        </div>

        <div id="Code" class="tabcontent">
            <textarea id="CodeOutput"></textarea><br /><br />
            <input id="RemoveDefaults" type="checkbox" onclick="updateHeatMapLayer()" checked="checked" /> Remove defaults
            <button class="copyBtn" data-clipboard-target="#CodeOutput">Copy to clipboard</button>
        </div>
    </fieldset>

    <div id="myMap"></div>
</body>
</html>
              
            
!

CSS

              
                #myMap {
  position: relative;
  width: calc(100% - 375px);
  min-width: 350px;
  height: 600px;
  float: left;
}

.sidePanel {
  width: 325px;
  height: 580px;
  float: left;
  margin-right: 10px;
}

#CodeOutput {
  width: 300px;
  height: 400px;
  overflow-y: auto;
}

.copyBtn {
  float: right;
}

table td:nth-of-type(1) {
  width: 120px;
}

table td:nth-of-type(2) {
  width: 200px;
}

.tab {
  overflow: hidden;
  border: 1px solid #ccc;
  background-color: #f1f1f1;
}

.tab button {
  background-color: inherit;
  float: left;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 6px 8px;
  transition: 0.3s;
  font-size: 14px;
}

.tab button:hover {
  background-color: #ddd;
}

.tab button.active {
  background-color: #ccc;
}

.tabcontent {
  display: none;
  padding: 6px 12px;
  border: 1px solid #ccc;
  border-top: none;
}

/* Dropdown Button */
.dropbtn {
  background-color: white;
  color: white;
  height: 20px;
  width: 150px;
  border: none;
  cursor: pointer;
}

/* Dropdown button on hover & focus */
.dropbtn:hover, .dropbtn:focus {
  background-color: white;
}

/* The container <div> - needed to position the dropdown content */
.dropdown {
  position: relative;
  display: inline-block;
}

/* Dropdown Content (Hidden by Default) */
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

/* Links inside the dropdown */
.dropdown-content a {
  color: black;
  padding: 6px;
  display: block;
}

/* Change color of dropdown links on hover */
.dropdown-content a:hover {
  background-color: #ddd
}

/* Show the dropdown menu (use JS to add this class to the .dropdown-content container when the user clicks on the dropdown button) */
.show {
  display: block;
} 
              
            
!

JS

              
                var map, datasource, heatMapLayer, defaultOptions, removeDefaults, selectedGradientIdx = 0;

var magWeight = [
  'interpolate',
  ['linear'],
  ['get', 'mag'],
  0, 0,
  6, 1
];

var heatGradients = [
  //Default
  [
    "interpolate",
    ["linear"],
    ["heatmap-density"],
    0, "rgba(0,0,255,0)",
    0.1, "royalblue",
    0.3, "cyan",
    0.5, "lime",
    0.7, "yellow",
    1, "red"
  ],

  //Default with semi-transparent black mask
  [
    "interpolate",
    ["linear"],
    ["heatmap-density"],
    0, "rgba(0,0,0,0.5)",
    0.1, "royalblue",
    0.3, "cyan",
    0.5, "lime",
    0.7, "yellow",
    1, "red"
  ],

  //Color Spectur
  [
    'interpolate',
    ['linear'],
    ['heatmap-density'],
    0, 'rgba(0,0,0,0)',
    0.01, 'navy',
    0.25, 'blue',
    0.5, 'green',
    0.75, 'yellow',
    1, 'red'
  ],

  //Incandescent
  [
    'interpolate',
    ['linear'],
    ['heatmap-density'],
    0, 'rgba(0,0,0,0)',
    0.01, 'black',
    0.33, 'darkred',
    0.66, 'yellow',
    1, 'white'
  ],

  //Heated Metal
  [
    'interpolate',
    ['linear'],
    ['heatmap-density'],
    0, 'rgba(0,0,0,0)',
    0.01, 'black',
    0.25, 'purple',
    0.5, 'red',
    0.75, 'yellow',
    1, 'white'
  ],

  //Sunrise
  [
    'interpolate',
    ['linear'],
    ['heatmap-density'],
    0, 'rgba(0,0,0,0)',
    0.01, 'red',
    0.66, 'yellow',
    1, 'white'
  ],

  [
    'step',
    ['heatmap-density'],
    'transparent',          
    0.01, 'navy',
    0.25, 'green',
    0.50, 'yellow',
    0.75, 'red'
  ],


  //Sunrise
  [
    'interpolate',
    ['linear'],
    ['heatmap-density'],
    0, 'rgba(0,0,0,0)',
    0.01, '#feb24c',
    0.03, '#feb24c',
    0.5, '#fd8d3c',
    0.7, '#fc4e2a',
    1, '#e31a1c'
  ],

  //Light blue to red
  [
    'interpolate',
    ['linear'],
    ['heatmap-density'],
    0, 'rgba(33,102,172,0)',
    0.2, 'rgb(103,169,207)',
    0.4, 'rgb(209,229,240)',
    0.6, 'rgb(253,219,199)',
    0.8, 'rgb(239,138,98)',
    1, 'rgb(178,24,43)'
  ],

  //Gray to Aqua Green
  [
    'interpolate',
    ['linear'],
    ['heatmap-density'],
    0, 'rgba(236,222,239,0)',
    0.2, 'rgb(208,209,230)',
    0.4, 'rgb(166,189,219)',
    0.6, 'rgb(103,169,207)',
    0.8, 'rgb(28,144,153)'
  ],

  //Purple, pink, light blue
  [
    'interpolate',
    ['linear'],
    ['heatmap-density'],
    0, 'rgba(0,0,0,0)',
    0.01, 'purple',
    0.5, '#fb00fb',
    1, '#00c3ff'
  ]
];

function GetMap() {
  createGradientOptions();

  //Initialize a map instance.
  map = new atlas.Map('myMap', {
    center: [-120, 40],
    zoom: 1,
    view: "Auto",
    style: 'grayscale_dark',

    //Add your Azure Maps subscription client ID to the map SDK.
    authOptions: {
      authType: "anonymous",
      clientId: "04ec075f-3827-4aed-9975-d56301a2d663", //Your Azure Maps account Client ID is required to access your Azure Maps account.

      getToken: function (resolve, reject, map) {
        //URL to your authentication service that retrieves an Azure Active Directory Token.
        var tokenServiceUrl = "https://azuremapscodesamples.azurewebsites.net/Common/TokenService.ashx";

        fetch(tokenServiceUrl).then(r => r.text()).then(token => resolve(token));
      }
    }
  });

  //Wait until the map resources have fully loaded.
  map.events.add('load', function (e) {

    //Create a style control and add it to the map.
    map.controls.add(new atlas.control.StyleControl({
      style: 'dark'
    }), {
      position: 'top-right'
    });

    //Create a data source and add it to the map.
    datasource = new atlas.source.DataSource();
    map.sources.add(datasource);

    //Load a data set of points, in this case all earthquakes from the past 30 days.
    datasource.importDataFromUrl('https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.geojson');

    //Create a heat map layer and add it to the map.
    heatMapLayer = new atlas.layer.HeatMapLayer(datasource);
    map.layers.add(heatMapLayer, 'labels');

    defaultOptions = heatMapLayer.getOptions();

    //Update the heat map layer with the options in the input fields.
    gradientSelected(document.getElementById('gradientDropdown').childNodes[0], 0);
    toggleGradientDropdown();
  });

  new ClipboardJS('.copyBtn');
}

function updateHeatMapLayer() {
  var options = getInputOptions();

  heatMapLayer.setOptions(options);

  document.getElementById('CodeOutput').value = JSON.stringify(options, null, '\t').replace(/\"([^(\")"]+)\":/g, "$1:");
}

function getInputOptions() {
  removeDefaults = document.getElementById('RemoveDefaults').checked;

  return {
    color: (removeDefaults && selectedGradientIdx == 0)? undefined: heatGradients[selectedGradientIdx],
    radius: getPropertyValue('radius', parseFloat(document.getElementById('Radius').value)),
    opacity: getPropertyValue('opacity', parseFloat(document.getElementById('Opacity').value)),
    intensity: getPropertyValue('intensity', parseFloat(document.getElementById('Intensity').value)),
    weight: document.getElementById('Weight').checked ? magWeight: 1,
    minZoom: getPropertyValue('minZoom', parseFloat(document.getElementById('MinZoom').value)),
    maxZoom: getPropertyValue('maxZoom', parseFloat(document.getElementById('MaxZoom').value)),
    visible: getPropertyValue('visible', document.getElementById('Visible').checked)
  };
}

function getPropertyValue(propertyName, value) {
  if (removeDefaults && defaultOptions[propertyName] === value) {
    return undefined;
  }

  return value;
}

function getSelectValue(id) {
  var elm = document.getElementById(id);
  return elm.options[elm.selectedIndex].value;
}

function openTab(elm, tabName) {
  var i, tabcontent, tablinks;
  tabcontent = document.getElementsByClassName("tabcontent");
  for (i = 0; i < tabcontent.length; i++) {
    tabcontent[i].style.display = "none";
  }
  tablinks = document.getElementsByClassName("tablinks");
  for (i = 0; i < tablinks.length; i++) {
    tablinks[i].className = tablinks[i].className.replace(" active", "");
  }
  document.getElementById(tabName).style.display = "block";
  elm.className += " active";
}

function createGradientOptions() {
  var html = [];

  for (var i = 0; i < heatGradients.length; i++) {
    var canvas = document.createElement('canvas');
    canvas.width = 150;
    canvas.height = 15;

    var ctx = canvas.getContext('2d');
    var grd = ctx.createLinearGradient(0, 0, 150, 0);

    if (heatGradients[i][0] === 'interpolate' && heatGradients[i][1][0] === 'linear') {
      for (var j = 3; j < heatGradients[i].length; j += 2) {
        grd.addColorStop(heatGradients[i][j], heatGradients[i][j + 1]);
      }
    } else if (heatGradients[i][0] === 'step') {
      grd.addColorStop(0, heatGradients[i][2]);

      for (var j = 3; j < heatGradients[i].length - 1; j += 2) {
        grd.addColorStop(heatGradients[i][j], heatGradients[i][j + 1]);

        if ((j + 3) < heatGradients[i].length && (heatGradients[i][j] - 0.001) <= 1) {
          grd.addColorStop(heatGradients[i][j + 2] - 0.001, heatGradients[i][j + 1]);
        }
      }

      grd.addColorStop(1, heatGradients[i][heatGradients[i].length - 1]);
    }

    ctx.fillStyle = grd;
    ctx.fillRect(0, 0, 150, 15);

    html.push('<a href="javascript:void(0)" onclick="gradientSelected(this, ', i, ');"><img src="', canvas.toDataURL(),'"/></a>');
  }

  document.getElementById('gradientDropdown').innerHTML = html.join('');
}

function gradientSelected(elm, idx) {
  selectedGradientIdx = idx;
  updateHeatMapLayer();
  document.getElementById('gradientDropdownBtn').style.backgroundImage = 'url(' + elm.childNodes[0].src + ')';
  toggleGradientDropdown();
}

function toggleGradientDropdown() {
  document.getElementById("gradientDropdown").classList.toggle("show");
}
              
            
!
999px

Console