applied-dataviz-learn-d3/example3.html at master · CenterForCollectiveLearning/applied-dataviz-learn-d3 · GitHub

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<html>
  <head>
    <title>MAS.S70 | D3 workshop</title>
    <link href="https://fonts.googleapis.com/css?family=PT+Sans" rel="stylesheet">
    <style>
      body {
        margin: 0;
        padding: 3%;
        font-family: 'PT Sans', sans-serif;
      }
      .page {
        margin: 0 auto;
        max-width: 800px;
        width: 90%;
      }
      h1 {
        font-weight: normal;
        text-rendering: optimizeLegibility;
      }
      .chart rect {
        fill: rgba(3, 168, 124, 0.8);
      }
      .chart text {
        fill: white;
        font: 10px sans-serif;
        text-anchor: end;
      }
    </style>
  </head>
  <body>
    <div class="page">
      <h1>Constructing random data | Loops</h1>
      <br />
      <h2> What does a loop do? </h2>
      <p>
        Let's log every number between 1 and 100 in the console!
      </p>
      <br />
      <h2> Introducing the <i>"if"</i> statement </h2>
      <p>
        Now, let's log every number except 42. For 42, we log
        "The answer to Life, the Universe and Everything" instead.
      </p>
      <br />
      <h2> Generating random data for our chart </h2>
      <p>
        Can we use what we've learned to generate random data for our bar chart?
      </p>
      <svg id="svg1"></svg>
    </div>
    <script src="http://d3js.org/d3.v3.min.js"></script>
    <script>
      // Log all numbers
      var numberList = []
      // Your loop
      console.log(numberList)

      // Log all numbers except 42
      var numberList2 = []
      // Your loop
      console.log(numberList2)

      // Generate random data and it will be plotted in our chart
      var data = [];
      // Your loop to generate random data (Math.random, Math.floor)

      // Our old bar chart code
      var width = 420;
      var barHeight = 20;

      var x = d3.scale.linear()
          .domain([0, d3.max(data)])
          .range([0, width]);

      var chart1 = d3.select("#svg1")
          .attr("width", width)
          .attr("height", barHeight * data.length)
          .attr("class", "chart");

      var bar1 = chart1.selectAll("g")
          .data(data)
        .enter().append("g")
          .attr("transform", function(d, i) { return "translate(0," + i * barHeight + ")"; });

      bar1.append("rect")
          .attr("width", function(d, i) {return x(d)})
          .attr("height", barHeight - 1);

      bar1.append("text")
          .attr("x", function(d) { return x(d) - 3; })
          .attr("y", barHeight / 2)
          .attr("dy", ".35em")
          .text(function(d) { return d; });
    </script>
  </body>
</html>