Radial link shape. about d3-hierarchy HOT 1 CLOSED

var link = svg.selectAll(".link")
    .data(nodes.slice(1))
  .enter().append("path")
    .attr("class", "link")
    .attr("d", function(d) {
      return "M" + project(d.x, d.y)
          + "C" + project(d.x, (d.y + d.parent.y) / 2)
          + " " + project(d.parent.x, (d.y + d.parent.y) / 2)
          + " " + project(d.parent.x, d.parent.y);
    });

function project(x, y) {
  var angle = (x - 90) / 180 * Math.PI, radius = y;
  return [radius * Math.cos(angle), radius * Math.sin(angle)];
}