CODEWITHSUNDEEP
javascriptd3.jstopojson
Parzival
Parzival

Reputation: 2064

Let's make a map Topojson doesn't appear - no error msgs but nothing happens

I want to use D3 to plot a map of Brazil (state boundaries) but I'm failing. The map is in Topojson format (it's here) and I'm following Mike Bostock's tutorial. I can replicate the tutorial results exactly when plotting the UK (map here), but when I try plotting Brazil nothing happens - and there are no error messages in the JavaScript console.

Here's my code:

<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 1160;

var projection = d3.geo.albers()
    .center([0, 55.4])
    .rotate([4.4, 0])
    .parallels([50, 60])
    .scale(1200 * 5)
    .translate([width / 2, height / 2]);

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

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

/*
PLOTTING THE UK WORKS
d3.json("uk.json", function(error, uk) {
  console.log(uk)
  svg.append("path")
      .datum(topojson.feature(uk, uk.objects.subunits))
      .attr("d", path);
});
*/

/* PLOTTING BRAZIL DOESN'T WORK */
d3.json("br-states.json", function(error, uf) {
  console.log(uf)
  svg.append("path")
      .datum(topojson.feature(uf, uf.objects.states))
      .attr("d", path);
});

</script>
</body>

Upvotes: 0

Views: 453

Answers (1)

Hugolpz
Hugolpz

Reputation: 18248

The following must be changed to your needs.

 // England viewport
var projection = d3.geo.albers()
    .center([0, 55.4])
    .rotate([4.4, 0])
    .parallels([50, 60])
    .scale(1200 * 5)
    .translate([width / 2, height / 2]);

Currently zooming on the area of England :)

Something such :

// somewhere in South america
var projection = d3.geo.mercator()   // albers may fails for Brazil
    .center([-40, -30])          // country center
    .rotate([4.4, 0])               //???? Check the api and edit for Brazil
    .parallels([0, -60])          // ???
    .scale(400)                     // smaller num = smaller Earth
    .translate([width / 2, height / 2]);  // topojson data is initially centered aroun x:0,y:0. This put back into the viewbox

Upvotes: 1

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