D3 Examples - Invitations Links Map

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.graticule {
  fill: none;
  stroke: #777;
  stroke-width: .5px;
  stroke-opacity: .5;
}
​
.land {
  fill: #222;
}
​
.boundary {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}
​
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
​
var width = 960,
    height = 480,
    userColor = "orange",
    userSize = 4,
    linkColor = "orange";
​
var projection = d3.geo.equirectangular()
    .scale(153)
    .translate([width / 2, height / 2])
    .precision(.1);
​
var path = d3.geo.path()
    .projection(projection);
​
var graticule = d3.geo.graticule();
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path);
​
d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/world-50m.json", function(error, world) {
  if (error) throw error;
​
  svg.insert("path", ".graticule")
      .datum(topojson.feature(world, world.objects.land))
      .attr("class", "land")
      .attr("d", path);
​
  svg.insert("path", ".graticule")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
      .attr("class", "boundary")
      .attr("d", path);
​
  d3.csv("invitation_chain.csv", type, function (data){
    
    svg.selectAll("circle").data(data).enter().append("circle")
      .attr("r", userSize)
      .attr("fill", userColor)
      .attr("cx", function (d){ return d.projected[0]; })
      .attr("cy", function (d){ return d.projected[1]; });
    
    var links = generateLinks(data);
    
    svg.selectAll("line").data(links).enter().append("line")
      .attr("r", 4)
      .attr("stroke", linkColor)
      .attr("stroke-width", "1px")
      .attr("x1", function (d){ return d.projected[0]; })
      .attr("y1", function (d){ return d.projected[1]; })
      .attr("x2", function (d){ return d.projected_invited_by[0]; })
      .attr("y2", function (d){ return d.projected_invited_by[1]; });
  });
});
function type(d){
  
  // This should actually be [d.longitude, d.latitude]
  // It looks like these are reversed in the data.
  d.projected = projection([d.latitude, d.longitude]);
  return d;
}
​
function generateLinks(data){
  locationsByUser = {};
  data.forEach(function (d){
    locationsByUser[d.user_name] = d.projected;
  });
  
  return data.filter(function (d){
    return d.invited_by_user_name;
  }).map(function (d){
    d.projected_invited_by = locationsByUser[d.invited_by_user_name];
    //console.log(d.projected_invited_by);
    return d;
  });
}
  
d3.select(self.frameElement).style("height", height + "px");
​
</script>
​
    