WWSD #6-a: d3 mouse interaction (topojson)

Working with spatial data

Example #6

Working with TopoJSON and d3.js projections for mapping geospatial data.

forked from mbostock's block: U.S. Counties TopoJSON

forked from enjalot's block: WWSD #5: d3 + TopoJSON

forked from enjalot's block: WWSD #6: d3 mouse interaction

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

path {
  fill: #ccc;
  stroke: #fff;
  stroke-width: .5px;
}
  
circle {
  fill: #fff;
  fill-opacity: 0.4;
  stroke: #111;
}
  
path.active {
  fill: #ff7f7f;
}
  circle.active {
    fill: #f00;
  }

</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 = 500;

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

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

var url = "https://enjalot.github.io/wwsd/data/world/ne_50m_admin_0_countries.topojson"
var url2 = "https://enjalot.github.io/wwsd/data/world/ne_50m_populated_places_simple.topojson"
d3.json(url, function(error, countries) {
d3.json(url2, function(error, places) {
  if (error) throw error;
  
  console.log("topojson", countries, places);
  var geocountries = topojson.feature(countries, countries.objects.ne_50m_admin_0_countries);
  console.log("geojson", geocountries)
  
  var geoplaces = topojson.feature(places, places.objects.ne_50m_populated_places_simple);

svg.selectAll("path")
    .data(geocountries.features)
  .enter().append("path")
    .attr("d", path)
  
  
  svg.selectAll("circle")
  .data(geoplaces.features)
  .enter().append("circle")
  .attr({
    r: 5,
    cx: function(d) { return projection(d.geometry.coordinates)[0]},
    cy: function(d) { return projection(d.geometry.coordinates)[1]}
  })
  
  
  
});
});

</script>

https://d3js.org/d3.v3.min.js

https://d3js.org/topojson.v1.min.js