How to run Mike Bostock's D3 examples?

Question

I\'ve been trying to run Mike Bostock\'s See-Through Globe example, but the references to his json files are incorrect if you try to reproduce it locally.

The issue comes

Answer 1

You can access the data directly here: http://bl.ocks.org/mbostock/raw/4090846/world-110m.json

To make it work, you'll need to create a new variable in your script and assign the json to it directly.

Code from the fiddle you provided:

var topo = // Paste data from provided link here. It will be one big object literal.

var width = 960,
    height = 960,
    speed = -1e-2,
    start = Date.now();

var sphere = {type: "Sphere"};

var projection = d3.geo.orthographic()
    .scale(width / 2.1)
    .translate([width / 2, height / 2])
    .precision(.5);

var graticule = d3.geo.graticule();

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

var context = canvas.node().getContext("2d");

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

// d3.json("https://render.github.com/mbostock/topojson/master/examples/world-110m.json", function(error, topo) {
  var land = topojson.feature(topo, topo.objects.land), // topo var is now provided by pasted-in data instead of fetched json.
      grid = graticule();

  d3.timer(function() {
    context.clearRect(0, 0, width, height);

    projection.rotate([speed * (Date.now() - start), -15]).clipAngle(90);

    context.beginPath();
    path(sphere);
    context.lineWidth = 3;
    context.strokeStyle = "#000";
    context.stroke();
    context.fillStyle = "#fff";
    context.fill();

    projection.clipAngle(180);

    context.beginPath();
    path(land);
    context.fillStyle = "#dadac4";
    context.fill();

    context.beginPath();
    path(grid);
    context.lineWidth = .5;
    context.strokeStyle = "rgba(119,119,119,.5)";
    context.stroke();

    projection.clipAngle(90);

    context.beginPath();
    path(land);
    context.fillStyle = "#737368";
    context.fill();
    context.lineWidth = .5;
    context.strokeStyle = "#000";
    context.stroke();
  });
// });

d3.select(self.frameElement).style("height", height + "px");

I would have modified the fiddle directly, but the json data file is large enough that jsfiddle chokes when I try to paste it in.

Hope this helps.

Answer 2

You can't access the remote json files because of same origin policy. And you won't be able to retrieve a JSON object using the file: protocol. Unless you want to perform surgery on the code by embedding the JSON directly, you're going to have to run a local server.

An easy way to run a local web server is execute:

python -m SimpleHTTPServer 8888 &

from the "root" directory of your site and then access it via http://localhost:8888