block by pnavarrc b7accd7b252c85907a79

Click and Zoom

Full Screen

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <title>Click to Zoom</title>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>
</head>
<body>

  <style>
  body {
    margin: 20px;
  }

  .sphere {
    fill: #A7DBD8;
    stroke: #79A09E;
    stroke-width: 2px;
  }

  .country {
    fill: #E0E4CC;
    stroke: #ACAF9F;
    stroke-width: 1;
  }

  .graticule {
    fill: none;
    stroke: #79A09E;
    stroke-width: 1;
    stroke-dasharray: 1,1;
  }

  .country:hover {
    fill: #ECD078;
    cursor: pointer;
  }

  </style>

  <div id="map-container"></div>

  <script>

    // Set the dimensions of the map
    var width  = 960,
        height = width / 2;

    var centerX = width / 2,
        centerY = height / 2,
        zoomFactor = 4;

    // Create a selection for the container div and append the svg element
    var div = d3.select('#map-container'),
        svg = div.append('svg');

    // Set the size of the SVG element
    svg
      .attr('width', width)
      .attr('height', height);

    // Create and configure a geographic projection
    var projection = d3.geo.equirectangular()
      .scale(height / Math.PI)
      .translate([width / 2, height / 2]);

    // Create and configure a path generator
    var pathGenerator = d3.geo.path()
      .projection(projection);

    // Create and configure the graticule generator (one line every 20 degrees)
    var graticule = d3.geo.graticule();

    // Retrieve the geographic data asynchronously
    d3.json('countries.geojson', function(err, data) {

      // Throw errors on getting or parsing the file
      if (err) { throw err; }

      // Create groups to hold the countries and labels
      var grp = svg.selectAll('g.container').data([data]);

      grp.enter().append('g').classed('container', true);
      grp.exit().remove();

      // Shpere
      var sphere = grp.selectAll('path.sphere').data([{type: 'Sphere'}]);

      sphere.enter().append('path').classed('sphere', true);
      sphere.attr('d', pathGenerator);
      sphere.exit().remove();

      // Graticule lines (behind the land)
      var lines = grp.selectAll('path.graticule').data([graticule()]);

      lines.enter().append('path').classed('graticule', true);
      lines.attr('d', pathGenerator);
      lines.exit().remove();

      // Add the paths
      var path = grp.selectAll('path.country').data(data.features);

      path.enter().append('path').classed('country', true);
      path.attr('d', pathGenerator);
      path.exit().remove();

      // Add on click zooming
      path.on('click', function(d) {

        d.centered = !d.centered;

        var centerCoords = d3.geo.centroid(d),
            centerPixels = projection(centerCoords);

        if (d.centered) {
          grp.transition().duration(2e3)
            .attr('transform', function() {

              var dx = (width / 2)  - zoomFactor * centerPixels[0],
                  dy = (height / 2) - zoomFactor * centerPixels[1];

              var t = 'translate(' + [dx, dy] + ')',
                  s = 'scale(' + zoomFactor + ')';

              return t + s;
            });
        } else {
          // Restore the group scale
          grp.transition().duration(1500).attr('transform', '');
        }

      });

    });
  </script>

</body>
</html>

Makefile

# Download and Transform the 1:50m Country Shapefiles from Natural Earth
# http://www.naturalearthdata.com/downloads/50m-cultural-vectors/

URL = http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/50m/cultural/ne_50m_admin_0_countries.zip

# Download the zip file from the Natural Earth server
ne_50m_admin_0_countries.zip:
	curl -LO $(URL)

# Unzip the shapefiles
ne_50m_admin_0_countries.shp: ne_50m_admin_0_countries.zip
	unzip ne_50m_admin_0_countries.zip
	touch ne_50m_admin_0_countries.shp

# Convert the shapefiles to GeoJSON
countries.geojson: ne_50m_admin_0_countries.shp
	ogr2ogr -f GeoJSON countries.geojson ne_50m_admin_0_countries.shp

# Convert the GeoJSON file to TopoJSON
countries.topojson: countries.geojson
	topojson -p -o countries.topojson countries.geojson

# Remove source and temporary files
clean:
	rm ne_50m_admin_0_countries*