blog-real-time-word-cloud

index.js

async function init () {
  const cloud = await getCloud();

  const highestScore = Math.max(...cloud.map((x) => x.size));

  var layout = d3.layout.cloud()
    .size([500, 500])
    .words(cloud)
    .rotate(function () { return ~~(Math.random() * 2) * 90; })
    .font("Impact")
    .fontSize(function (d) { return d.size / highestScore * 90 })
    .on("end", draw);

  layout.start();

  function draw (words) {
    d3.select("body")
      .append("svg")
      .attr("width", layout.size()[0])
      .attr("height", layout.size()[1])
      .append("g")
      .attr("transform", "translate(" + layout.size()[0] / 2 + "," + layout.size()[1] / 2 + ")")
      .selectAll("text")
      .data(words)
      .enter().append("text")
      .style("font-size", function (d) { return d.size + "px"; })
      .style("font-family", "Impact")
      .attr("text-anchor", "middle")
      .attr("transform", function (d) {
        return "translate(" + [d.x, d.y] + ")rotate(" + d.rotate + ")";
      })
      .text(function (d) { return d.text; });
  }
}