pbogden/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Demo of leaflet & D3 from Mike Bostock's tutorial, updated with an openstreetmap URL that works.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<title>leaflet</title>
<style>

@import url(//cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet.css);

#map {
  width: 960px;
  height: 500px;
}

path {
  fill: #000;
  fill-opacity: .2;
  stroke: #fff;
  stroke-width: 1.5px;
}

path:hover {
  fill: brown;
  fill-opacity: .7;
}

</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet.js"></script>
<body>
<div id="map"</div>
<script>
var osmUrl = 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
    osmAttrib = '&copy; <a href="http://openstreetmap.org/copyright">OpenStreetMap</a> contributors',
    osm = L.tileLayer(osmUrl, {maxZoom: 18, attribution: osmAttrib});

var map = L.map('map').setView([37.8, -96.9], 4).addLayer(osm);

var svg = d3.select(map.getPanes().overlayPane).append("svg"),
    g = svg.append("g").attr("class", "leaflet-zoom-hide");

var transform = d3.geo.transform({point: projectPoint}),
    path = d3.geo.path().projection(transform);

d3.json("us.json", function(error, us) {
  var features = us.objects.us.geometries.map(function(d) { return topojson.feature(us, d); });
  var all = topojson.merge(us, us.objects.us.geometries);

  var states = g.selectAll("path")
      .data(features)
    .enter()
      .append("path");

  map.on("viewreset", reset);
  reset();

  // Reposition the SVG to cover the features.
  function reset() {
    var bounds = path.bounds(all),
        topLeft = bounds[0],
        bottomRight = bounds[1];

    svg .attr("width", bottomRight[0] - topLeft[0])
        .attr("height", bottomRight[1] - topLeft[1])
        .style("left", topLeft[0] + "px")
        .style("top", topLeft[1] + "px");

    g.attr("transform", "translate(" + -topLeft[0] + "," + -topLeft[1] + ")");

    states.attr("d", path);
  }
});

// Use Leaflet to implement a D3 geometric transformation.
function projectPoint(x, y) {
  // Returns the map layer point that corresponds to the given geographical coordinates
  var point = map.latLngToLayerPoint(new L.LatLng(y, x));
  this.stream.point(point.x, point.y);
}
</script>

## thumbnail.png

      
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              thumbnail.png
            
          
## us.json

      
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    Raw
  

              us.json
            
          
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	<!DOCTYPE html>
	<meta charset="utf-8">
	<title>leaflet</title>
	<style>

	@import url(//cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet.css);

	#map {
	width: 960px;
	height: 500px;
	}

	path {
	fill: #000;
	fill-opacity: .2;
	stroke: #fff;
	stroke-width: 1.5px;
	}

	path:hover {
	fill: brown;
	fill-opacity: .7;
	}

	</style>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.js"></script>
	<script src="http://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.2/leaflet.js"></script>
	<body>
	<div id="map"</div>
	<script>
	var osmUrl = 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
	osmAttrib = '© <a href="http://openstreetmap.org/copyright">OpenStreetMap</a> contributors',
	osm = L.tileLayer(osmUrl, {maxZoom: 18, attribution: osmAttrib});

	var map = L.map('map').setView([37.8, -96.9], 4).addLayer(osm);

	var svg = d3.select(map.getPanes().overlayPane).append("svg"),
	g = svg.append("g").attr("class", "leaflet-zoom-hide");

	var transform = d3.geo.transform({point: projectPoint}),
	path = d3.geo.path().projection(transform);

	d3.json("us.json", function(error, us) {
	var features = us.objects.us.geometries.map(function(d) { return topojson.feature(us, d); });
	var all = topojson.merge(us, us.objects.us.geometries);

	var states = g.selectAll("path")
	.data(features)
	.enter()
	.append("path");

	map.on("viewreset", reset);
	reset();

	// Reposition the SVG to cover the features.
	function reset() {
	var bounds = path.bounds(all),
	topLeft = bounds[0],
	bottomRight = bounds[1];

	svg .attr("width", bottomRight[0] - topLeft[0])
	.attr("height", bottomRight[1] - topLeft[1])
	.style("left", topLeft[0] + "px")
	.style("top", topLeft[1] + "px");

	g.attr("transform", "translate(" + -topLeft[0] + "," + -topLeft[1] + ")");

	states.attr("d", path);
	}
	});

	// Use Leaflet to implement a D3 geometric transformation.
	function projectPoint(x, y) {
	// Returns the map layer point that corresponds to the given geographical coordinates
	var point = map.latLngToLayerPoint(new L.LatLng(y, x));
	this.stream.point(point.x, point.y);
	}
	</script>