Spain internal migrations 2016

Chord diagram showing Spain internal migrations in 2016. Data from ine.es - Provisional data

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

body {
  font: 10px sans-serif;
}

.group-tick line {
  stroke: #000;
}

.ribbons {
  fill-opacity: 0.67;
}

</style>
<svg width="750" height="750"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

const svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height"),
    outerRadius = Math.min(width, height) * 0.5 - 80,
    innerRadius = outerRadius - 30;

const formatValue = d3.formatPrefix(",.0", 1e3);

const chord = d3.chord()
    .padAngle(0.05)
    .sortSubgroups(d3.descending);

const arc = d3.arc()
    .innerRadius(innerRadius)
    .outerRadius(outerRadius);

const ribbon = d3.ribbon()
    .radius(innerRadius);

//generated using https://jnnnnn.github.io/category-colors-constrained.html
var color = d3.scaleOrdinal()
    .domain(d3.range(54))
    .range(["#3957ff", "#d3fe14", "#c9080a", "#0b7b3e", "#0bf0e9", "#c203c8", "#fd9b39", "#888593", "#906407", "#fe6794", "#10b0ff", "#ac7bff", "#fee7c0", "#964c63", "#1da49c", "#0ad811", "#fe6cfe", "#297192", "#d1a09c", "#78579e", "#81ffad", "#739400", "#ca6949", "#d9bf01", "#646a58", "#d5097e", "#ccf6e9", "#9cb4b6", "#b6a7d4", "#9e8c62", "#6e83c8", "#01af64", "#a71afd", "#cfe589", "#d4ccd1", "#fd4109", "#bf8f0e", "#2f786e", "#4ed1a5", "#d8bb7d", "#a54509", "#6a9276", "#a4777a", "#fc12c9", "#606f15", "#3cc4d9", "#f31c4e", "#73616f", "#f097c6", "#fc8772", "#92a6fe", "#875b44"]);

d3.csv("migraciones.csv", (d) => {
        let array = [];
        for (let prop in d) {
           array.push(Math.round(parseFloat(d[prop])));
        }
        return array;
    }, (matrix) => {
      console.log(matrix);
      let columns = matrix.columns;
      delete matrix.columns;
      var g = svg.append("g")
        .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")")
        .datum(chord(matrix));

var group = g.append("g")
          .attr("class", "groups")
        .selectAll("g")
        .data(chords => chords.groups)
        .enter().append("g");

group.append("path")
          .style("fill", d => color(d.index))
          .style("stroke", d => d3.rgb(color(d.index)).darker())
          .attr("d", arc)
          .style('opacity', .1)
          .on("mouseover", fade(1))
          .on("mouseout", fade(.1));

group.append("text")
            .each(d => {d.angle = (d.startAngle + d.endAngle) / 2; })
            .attr("x", 8)
            .attr("dy", ".35em")
            .attr("text-anchor", d => d.angle > Math.PI ? "end" : null)
            .attr("transform", d => { 
              let degrees = (d.angle * 180 / Math.PI);
              if(degrees > 180) {
                    return "rotate(" + (degrees - 270) + 
              ") translate(" + (-outerRadius - 36) + ",0)";
              } else{
                return "rotate(" + (degrees - 90) + 
              ") translate(" + (outerRadius + 20) + ",0)"; 
              }
              
            })
            // .style("text-anchor", d => d.angle > Math.PI ? "end" : null)
            .text(function(d) { return columns[d.index]; });

var groupTick = group.selectAll(".group-tick")
        .data(d => groupTicks(d, 1e3))
        .enter().append("g")
          .attr("class", "group-tick")
          .attr("transform", d => "rotate(" + (d.angle * 180 / Math.PI - 90) + ") translate(" + outerRadius + ",0)");

groupTick.append("line")
          .attr("x2", 6);

groupTick
        .filter(d => d.value % 5e3 === 0)
        .append("text")
          .attr("x", 8)
          .attr("dy", ".35em")
          .attr("transform", d => d.angle > Math.PI ? "rotate(180) translate(-16)" : null)
          .style("text-anchor", d => d.angle > Math.PI ? "end" : null)
          .text(d => formatValue(d.value));

g.append("g")
          .attr("class", "ribbons")
        .selectAll("path")
        .data(function(chords) { return chords; })
        .enter().append("path")
          .attr("d", ribbon)
          .style("fill", d => color(d.target.index))
          .style("opacity", 0.1)
          .style("stroke", d => d3.rgb(color(d.target.index)).darker());
    });

// Returns an array of tick angles and values for a given group and step.
function groupTicks(d, step) {
  var k = (d.endAngle - d.startAngle) / d.value;
  return d3.range(0, d.value, step).map(function(value) {
    return {value: value, angle: value * k + d.startAngle};
  });
}

</script>

https://d3js.org/d3.v4.min.js