yagoferrer/map-tools

<div class="map-panel" ><pre class="language-javascript"><code class="language-javascript">
  map.addTopoJson(data, [{
  object: 'us_country',
  style: {
    strokeColor: '#2c2c2c',
    strokeWeight: 0.5,
    fillOpacity: 0
  },filters: ['NAME']}]);
  var colorado = map.findFeature({NAME:'Colorado'}, {limit: 1});
  var nevada = map.findFeature({NAME:'Nevada'}, {limit: 1});
    var options = {
        style:{
            fillOpacity: 0.4,
            fillColor:'black',
            strokeColor: 'black'
  }};

  map.updateFeature([colorado, nevada], options);

  // Choropleth function based on the CENSUSAREA data
  function() {
    var value = (this.data.CENSUSAREA/570640.95);
    var alpha = 5;
    var h = 210, s = 100,
    // Increase the difference between colors
    l = (Math.pow((1 - value), alpha) * 50)+50;
    return {
      fillColor: 'hsl('+h+','+s+'%,'+l+'%)',
      fillOpacity:0.7
    }
  }

  var all = map.findFeature();
  map.updateFeature(all), {style: color});
</code></pre></div>