var xy = d3.geo.azimuthal().scale(240).mode("stereographic"),

    circle = d3.geo.greatCircle(),

    path = d3.geo.path().projection(xy),

    svg = d3.select("body").append("svg:svg");

d3.json("../data/world-countries.json", function(collection) {

  svg.selectAll("path")

      .data(collection.features)

    .enter().append("svg:path")

      .attr("d", function(d) { return path(circle.clip(d)); })

    .append("svg:title")

      .text(function(d) { return d.properties.name; });

});

function refresh(duration) {

  var p = svg.selectAll("path");

  if (duration) p = p.transition().duration(duration);

  p.attr("d", function(d) { return path(circle.clip(d)); });

  d3.select("#lon span")

      .text(xy.origin()[0]);

  d3.select("#lat span")

      .text(xy.origin()[1]);

  d3.select("#scale span")

      .text(xy.scale());

  d3.select("#translate-x span")

      .text(xy.translate()[0]);

  d3.select("#translate-y span")

      .text(xy.translate()[1]);

}