rveciana - d3compositeprojections-using-the-new-d3js-v5

d3CompositeProjections using the new d3js v5

This block shows how to use the d3-composite-projections with the version 5 of d3js.

The only change is the json request, that adds a then function instead of returning the data directly.

So this:

d3.json("malaysia.json", function(error, malaysia) {

Becomes this:

d3.json("malaysia.json").then(function(malaysia) {

The library works exactly the same way! Changes won’t bring the same job as in the v3 to v4.

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

.states {
  fill: #ccc;
  stroke: #fff;
}
</style>
<body>
<script src="https://d3js.org/d3.v5.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script src="https://unpkg.com/d3-composite-projections@1.2.0/d3-composite-projections.min.js"></script>
<script>
var width = 960,
    height = 500;

var projection = d3.geoMercatorMalaysia();
var path = d3.geoPath()
    .projection(projection);

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

    var t = d3.transition();
  
d3.json("malaysia.json").then(function(malaysia) {
  var malaysia = topojson.feature(malaysia, malaysia.objects.land);
  svg.selectAll(".land")
      .data(malaysia.features)
      .enter()
      .append("path")
      .attr("class", "land")
      .attr("d", path)
      .style("fill", "#aca")
      .style("stroke", "#000")
      .style("stroke-width", "0.5px")
      .on("mouseover", function(d,i) {
        d3.select(this).interrupt();
        d3.select(this)
          .transition(t)
          .style("fill", "red");
        })
      .on("mouseout", function(d,i) {
        d3.select(this).interrupt();
        d3.select(this)
          .transition(t)
          .style("fill", "#aca");
        });;

  svg
    .append("path")
      .style("fill","none")
      .style("stroke","#f00")
      .attr("d", projection.getCompositionBorders());

});

</script>