jasondavies/README.md

## readme-world-admin1.json

      
Display the source blob

    
Display the rendered blob

    
    Raw
  

              readme-world-admin1.json
            
          
      Loading

      Sorry, something went wrong. Reload?
      Sorry, we cannot display this file.
      Sorry, this file is invalid so it cannot be displayed.
      
          Viewer requires iframe.
      
    
## README.md

      
    Raw
  

              README.md
            
          
    A demo of Mike Bostock’s TopoJSON using states & provinces boundaries from Natural Earth.
With simplification turned on (-s 100), this reduces the original 57MB GeoJSON file to a mere 515KB!

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

path {
  fill: none;
  stroke: #000;
}

.graticule {
  fill: none;
  stroke: #ccc;
  stroke-width: .5px;
}

.foreground {
  fill: none;
  stroke: #333;
  stroke-width: 1.5px;
}

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="topojson.js"></script>
<script>

var width = 960,
    height = 500;

var projection = d3.geo.orthographic()
    .scale(250)
    .clipAngle(90);

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

var graticule = d3.geo.graticule();

var λ = d3.scale.linear()
    .domain([0, width])
    .range([-180, 180]);

var φ = d3.scale.linear()
    .domain([0, height])
    .range([90, -90]);

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

svg.on("mousemove", function() {
  var p = d3.mouse(this);
  projection.rotate([λ(p[0]), φ(p[1])]);
  svg.selectAll("path:not(.foreground)").attr("d", path);
});

svg.append("path")
    .attr("class", "graticule")
    .datum(graticule)
    .attr("d", path);

svg.append("path")
    .datum(graticule.outline)
    .attr("class", "foreground")
    .attr("d", path);

d3.json("readme-world-admin1.json", function(error, topology) {
  svg.append("path")
      .datum(topojson.mesh(topology))
      .attr("d", path);
});

</script>

## topojson.js
var topojson = {
  version: "0.0.1",
  mesh: function(topology) {
    var kx = topology.transform.scale[0],
        ky = topology.transform.scale[1],
        dx = topology.transform.translate[0],
        dy = topology.transform.translate[1];
    return {
      type: "MultiLineString",
      coordinates: topology.arcs.map(function(arc) {
        var y0 = 0,
            x0 = 0;
        return arc.map(function(point) {
          var x1 = x0 + point[0],
              y1 = y0 + point[1];
          x0 = x1;
          y0 = y1;
          return [x1 * kx + dx, y1 * ky + dy];
        });
      })
    };
  }
};
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	path {
	fill: none;
	stroke: #000;
	}

	.graticule {
	fill: none;
	stroke: #ccc;
	stroke-width: .5px;
	}

	.foreground {
	fill: none;
	stroke: #333;
	stroke-width: 1.5px;
	}

	</style>
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="topojson.js"></script>
	<script>

	var width = 960,
	height = 500;

	var projection = d3.geo.orthographic()
	.scale(250)
	.clipAngle(90);

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

	var graticule = d3.geo.graticule();

	var λ = d3.scale.linear()
	.domain([0, width])
	.range([-180, 180]);

	var φ = d3.scale.linear()
	.domain([0, height])
	.range([90, -90]);

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

	svg.on("mousemove", function() {
	var p = d3.mouse(this);
	projection.rotate([λ(p[0]), φ(p[1])]);
	svg.selectAll("path:not(.foreground)").attr("d", path);
	});

	svg.append("path")
	.attr("class", "graticule")
	.datum(graticule)
	.attr("d", path);

	svg.append("path")
	.datum(graticule.outline)
	.attr("class", "foreground")
	.attr("d", path);

	d3.json("readme-world-admin1.json", function(error, topology) {
	svg.append("path")
	.datum(topojson.mesh(topology))
	.attr("d", path);
	});

	</script>
	var topojson = {
	version: "0.0.1",
	mesh: function(topology) {
	var kx = topology.transform.scale[0],
	ky = topology.transform.scale[1],
	dx = topology.transform.translate[0],
	dy = topology.transform.translate[1];
	return {
	type: "MultiLineString",
	coordinates: topology.arcs.map(function(arc) {
	var y0 = 0,
	x0 = 0;
	return arc.map(function(point) {
	var x1 = x0 + point[0],
	y1 = y0 + point[1];
	x0 = x1;
	y0 = y1;
	return [x1 * kx + dx, y1 * ky + dy];
	});
	})
	};
	}
	};