armollica/README.md

## README.md

      
    Raw
  

              README.md
            
          
    In-browser GIS buffer via turf.js

  
## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <style>
      .county {
        fill: rgb(97, 183, 58);
        stroke: #fff;
        stroke-width: 2px;
      }

      .county.buffered {
        fill: rgba(255, 255, 255, 0.3);
        stroke: none;
      }
    </style>
  </head>
  <body>
    <script src="//api.tiles.mapbox.com/mapbox.js/plugins/turf/v2.0.0/turf.min.js"></script>
    <script src="//d3js.org/d3.v3.min.js" charset="utf-8"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.20/topojson.min.js"></script>
    <script>
      var width = 960,
          height = 500;

      var projection = d3.geo.conicConformal()
        .rotate([90, 0])
        .center([0.1995, 44.75])
        .parallels([29.5, 45.5])
        .scale(6000)
        .translate([width/2, height/2])
        .precision(0.1);

      var path = d3.geo.path()
          .projection(projection);

      var svg = d3.select("body").append("svg")
        .attr("width", width)
        .attr("height", height);

      d3.json("wi.json", function(error, wi) {
        if (error) throw error;

        wi = topojson.feature(wi, wi.objects.wi);
        var wiBuffered = buffer(wi, -5, "miles");

        svg.selectAll(".county").data(wi.features)
          .enter().append("path")
            .attr("class", "county")
            .attr("d", path);

        svg.selectAll(".county.buffered").data(wiBuffered.features)
          .enter().append("path")
            .attr("class", "county buffered")
            .attr("d", path);
      });

      function buffer(featureCollection, distance, unit) {
        var features = featureCollection.features
          .map(function(feature) {
            var buffered = null;
            try { buffered = turf.buffer(feature, distance, unit); }
            catch(e) { /* console.error(e); */ }
            return buffered;
          })
          .filter(function(feature) { return feature !== null; });

        return {
          type: "FeatureCollection",
          features: features,
          properties: null
        };
      }
    </script>
  </body>
</html>

## thumbnail.png

      
    Raw
  

              thumbnail.png
            
          
## wi.json

      
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    Raw
  

              wi.json
            
          
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	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title></title>
	<style>
	.county {
	fill: rgb(97, 183, 58);
	stroke: #fff;
	stroke-width: 2px;
	}

	.county.buffered {
	fill: rgba(255, 255, 255, 0.3);
	stroke: none;
	}
	</style>
	</head>
	<body>
	<script src="//api.tiles.mapbox.com/mapbox.js/plugins/turf/v2.0.0/turf.min.js"></script>
	<script src="//d3js.org/d3.v3.min.js" charset="utf-8"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.20/topojson.min.js"></script>
	<script>
	var width = 960,
	height = 500;

	var projection = d3.geo.conicConformal()
	.rotate([90, 0])
	.center([0.1995, 44.75])
	.parallels([29.5, 45.5])
	.scale(6000)
	.translate([width/2, height/2])
	.precision(0.1);

	var path = d3.geo.path()
	.projection(projection);

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height);

	d3.json("wi.json", function(error, wi) {
	if (error) throw error;

	wi = topojson.feature(wi, wi.objects.wi);
	var wiBuffered = buffer(wi, -5, "miles");

	svg.selectAll(".county").data(wi.features)
	.enter().append("path")
	.attr("class", "county")
	.attr("d", path);

	svg.selectAll(".county.buffered").data(wiBuffered.features)
	.enter().append("path")
	.attr("class", "county buffered")
	.attr("d", path);
	});

	function buffer(featureCollection, distance, unit) {
	var features = featureCollection.features
	.map(function(feature) {
	var buffered = null;
	try { buffered = turf.buffer(feature, distance, unit); }
	catch(e) { /* console.error(e); */ }
	return buffered;
	})
	.filter(function(feature) { return feature !== null; });

	return {
	type: "FeatureCollection",
	features: features,
	properties: null
	};
	}
	</script>
	</body>
	</html>