examples/mcv03_interaction.html

<!DOCTYPE html>
<html>

<head>
  <title>Multiple Coordinated View 03</title>
  <meta charset="utf-8">
  <script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>
  <script src="../web_modules/d3/d3.js"></script>
  <style type="text/css">
    body {
      width: 100vw;
      margin: 25px auto;
      font-family: "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
    }

    rect {
      fill: steelblue;
      fill-opacity: 0.8;
    }

    rect:hover {
      fill-opacity: 1;
    }

    path {
      fill-opacity: 0.8;
    }

    .selected,
    path:hover {
      fill-opacity: 1;
    }

    .axis {
      font-size: smaller;
    }

    main {
      display: flex;
      flex-wrap: wrap;
    }

    h3 {
      text-align: center;
    }

  </style>
</head>

<body>
  <h1>Student's First Multiple Coordinated View</h1>

  <div>
    <label for="passenger-class"><strong>Passenger Class:</strong></label>
    <select id="passenger-class">
      <option value="" selected>All Classes</option>
      <option value="1">First Class</option>
      <option value="2">2nd Class</option>
      <option value="3">3rd Class</option>
    </select>
    <!--TODO add label for the currently selected sex-->
  </div>

  <main>
    <section>
      <h3>Gender Distribution</h3>
      <svg id="sex"></svg>
    </section>
    <section>
      <h3>Age Histogram</h3>
      <svg id="age"></svg>
    </section>
  </main>

  <script type="text/javascript">
    const state = {
      data: [],
      passengerClass: "",
      // TODO store selected sex
    };


    function createHistogram(svgSelector) {
      const margin = {
        top: 40,
        bottom: 10,
        left: 120,
        right: 20
      };
      const width = 600 - margin.left - margin.right;
      const height = 400 - margin.top - margin.bottom;

      // Creates sources <svg> element
      const svg = d3.select(svgSelector)
        .attr('width', width + margin.left + margin.right)
        .attr('height', height + margin.top + margin.bottom);

      // Group used to enforce margin
      const g = svg.append('g')
        .attr('transform', `translate(${margin.left},${margin.top})`);


      // Scales setup
      const xscale = d3.scaleLinear().range([0, width]);
      const yscale = d3.scaleLinear().range([0, height]);

      // Axis setup
      const xaxis = d3.axisTop().scale(xscale);
      const g_xaxis = g.append('g').attr('class', 'x axis');
      const yaxis = d3.axisLeft().scale(yscale);
      const g_yaxis = g.append('g').attr('class', 'y axis');


      function update(new_data) { //: (IPerson[] & {x0: number, x1: number})[]
        //update the scales
        xscale.domain([0, d3.max(new_data, (d) => d.length)]);
        yscale.domain([new_data[0].x0, new_data[new_data.length - 1].x1]);
        //render the axis
        g_xaxis.transition().call(xaxis);
        g_yaxis.transition().call(yaxis);

        // Render the chart with new data

        // DATA JOIN
        const rect = g.selectAll('rect').data(new_data).join(
          (enter) => {
            // ENTER
            // new elements
            const rect_enter = enter.append('rect')
              .attr('x', 0) //set intelligent default values for animation
              .attr('y', 0)
              .attr('width', 0)
              .attr('height', 0);
            rect_enter.append('title');
            return rect_enter;
          },
          // UPDATE
          // update existing elements
          (update) => update,
          // EXIT
          // elements that aren't associated with data
          (exit) => exit.remove()
        );      

        // ENTER + UPDATE
        // both old and new elements
        rect.transition()
          .attr('height', (d) => yscale(d.x1) - yscale(d.x0) - 2)
          .attr('width', (d) => xscale(d.length))
          .attr('y', (d) => yscale(d.x0) + 1);

        rect.select('title').text((d) => `${d.x0}: ${d.length}`);
      }

      return update;
    }

    function createPieChart(svgSelector) {
      const margin = 10;
      const radius = 100;

      // Creates sources <svg> element
      const svg = d3.select(svgSelector)
        .attr('width', radius * 2 + margin * 2)
        .attr('height', radius * 2 + margin * 2);

      // Group used to enforce margin
      const g = svg.append('g')
        .attr('transform', `translate(${radius + margin},${radius + margin})`);

      const pie = d3.pie().value((d) => d.values.length).sortValues(null).sort(null);
      const arc = d3.arc().outerRadius(radius).innerRadius(0);
      const cscale = d3.scaleOrdinal(d3.schemeSet3);


      function update(new_data) { //{key: string, values: IPerson[]}[]
        const pied = pie(new_data);
        // Render the chart with new data

        cscale.domain(new_data.map((d) => d.key));

        // DATA JOIN
        const path = g.selectAll('path').data(pied, (d) => d.data.key).join(
          // ENTER
          // new elements
          (enter) => {
            const path_enter = enter.append('path');
            // TODO register click handler to change selected sex in state and call updateApp()
            path_enter.append('title');
            return path_enter;
          }
        );

        // ENTER + UPDATE
        // both old and new elements
        path
          .attr('d', arc) // TODO set the CSS class `selected` if the current data item is the selected sex in the state
          .style('fill', (d) => cscale(d.data.key));

        path.select('title').text((d) => `${d.data.key}: ${d.data.values.length}`);
      }

      return update;
    }

    /////////////////////////

    const ageHistogram = createHistogram('#age');
    const sexPieChart = createPieChart('#sex');

    function filterData() {
      return state.data.filter((d) => {
        if (state.passengerClass && d.pclass !== state.passengerClass) {
          return false;
        }
        // TODO apply additional selected sex filter
        return true;
      });
    }

    function wrangleData(filtered) {
      const ageHistogram = d3.histogram()
        .domain([0, 100])
        .thresholds(10)
        .value((d) => d.age);

      const ageHistogramData = ageHistogram(filtered);

      // always the two categories
      const sexPieData = ['female', 'male'].map((key) => ({
        key,
        values: filtered.filter((d) => d.sex === key)
      }));

      return {
        ageHistogramData,
        sexPieData
      };
    }

    function updateApp() {
      const filtered = filterData();

      const {
        ageHistogramData,
        sexPieData
      } = wrangleData(filtered);
      ageHistogram(ageHistogramData);
      sexPieChart(sexPieData);

      // TODO update label with selected sex information
    }

    d3.csv('titanic3.csv').then((parsed) => {
      state.data = parsed.map((row) => {
        row.age = parseInt(row.age, 10);
        row.fare = parseFloat(row.fare);
        return row;
      });

      updateApp();
    });

    //interactivity
    d3.select('#passenger-class').on('change', function () {
      const selected = d3.select(this).property('value');
      state.passengerClass = selected;
      updateApp();
    });

  </script>
</body>

</html>