D3 Examples - D3 gradient dots on Mapbox GL JS

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.js'></script>
  <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.css' rel='stylesheet' />
​
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    #map { 
      position:absolute; 
      width: 100%;
      height: 100%;
    }
    svg {
      position: absolute;
      width: 100%;
      height: 100%;
    }
  </style>
</head>
​
<body>
  <div id="map"></div>
  <script>
  mapboxgl.accessToken = 'pk.eyJ1IjoiY2piYXNzaW4iLCJhIjoiY2lnbnl5M2JlMDBkY21ma284MHpmYjdycSJ9.hCuiySWxJTct7nZvXRsiEQ';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/dark-v8',
    center: [-0.1,51.5119112],
      zoom: 10,
      pitch: 75
});
    
    map.scrollZoom.disable()
    map.addControl(new mapboxgl.Navigation());
​
    // Setup our svg layer that we can manipulate with d3
    var container = map.getCanvasContainer()
    var svg = d3.select(container).append("svg")
​
    
    function project(d) {
      return map.project(getLL(d));
    }
    function getLL(d) {
      return new mapboxgl.LngLat(+d.lon, +d.lat)
    }
  
    d3.csv("dots.csv", function(err, data) {
      //console.log(data[0], getLL(data[0]), project(data[0]))
      var dots = svg.selectAll("circle.dot")
        .data(data)
      
      grads = svg.append("defs").selectAll("radialGradient")
        .data(data)
       .enter()
        .append("radialGradient")
        .attr("gradientUnits", "objectBoundingBox")
        .attr("cx", 0)
        .attr("cy", 0)
        .attr("r", "100%")
        .attr("id", function(d, i) { return "grad"; });
​
    grads.append("stop")
        .attr("offset", "0%")
        .style("stop-color", "white");
​
    grads.append("stop")
        .attr("offset", "100%")
        .style("stop-color",  function(d) { return "#c51b8a"; });
      
      dots.enter().append("circle").classed("dot", true)
      .attr("r", 1)
      .style("fill", function(d,i) {
            return "url(#grad)";
        })
      .transition().duration(1000)
      .attr("r", 4)
      
      function render() {
        dots
        .attr({
          cx: function(d) { 
            var x = project(d).x;
            return x
          },
          cy: function(d) { 
            var y = project(d).y;
            return y
          },
        })
      }
​
      // re-render our visualization whenever the view changes
      map.on("viewreset", function() {
        render()
      })
      map.on("move", function() {
        render()
      })
​
      // render our initial visualization
      render()
    })
​
    
  </script>
</body>
​
    