cs560-p5 interaction

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

.axis--x path {
  display: none;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}

</style>
<svg width="960" height="500"></svg>
<script src="//d3js.org/d3.v4.min.js"></script>
<script>

var svg = d3.select("svg"),
    margin = {top: 20, right: 80, bottom: 30, left: 50},
    width = svg.attr("width") - margin.left - margin.right,
    height = svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var parseTime = d3.timeParse("%Y%m%d");

var x = d3.scaleTime().range([0, width]),
    y = d3.scaleLinear().range([height, 0]),
    z = d3.scaleOrdinal(d3.schemeCategory10);

var line = d3.line()
    .curve(d3.curveBasis)
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.temperature); });

d3.tsv("data.tsv", type, function(error, data) {
  if (error) throw error;

var cities = data.columns.slice(1).map(function(id) {
    return {
      id: id,
      values: data.map(function(d) {
        return {date: d.date, temperature: d[id]};
      })
    };
  });

x.domain(d3.extent(data, function(d) { return d.date; }));

y.domain([
    d3.min(cities, function(c) { return d3.min(c.values, function(d) { return d.temperature; }); }),
    d3.max(cities, function(c) { return d3.max(c.values, function(d) { return d.temperature; }); })
  ]);

z.domain(cities.map(function(c) { return c.id; }));

var visibleCities = {};
  for (var i in cities) {
      var id = cities[i].id;
      visibleCities[id] = true;
  }

function isVisible(cityId) {
      return visibleCities[cityId];
  }

function toggleVisibility(cityId) {
      visibleCities[cityId] = !visibleCities[cityId];
  }

var xAxis = d3.axisBottom(x);

g.append("g")
      .attr("class", "axis axis--y")
      .call(d3.axisLeft(y))
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", "0.71em")
      .attr("fill", "#000")
      .text("Temperature, ºF");

var city = g.selectAll(".city")
    .data(cities)
    .enter().append("g")
      .attr("class", "city")
      .attr("clipPath", "url(#clip)")
      ;

var zoom = d3.zoom()
    .scaleExtent([1 / 4, 8])
    .translateExtent([[-width, -Infinity], [2 * width, Infinity]])
    .on("zoom", zoomed);

var zoomRect = svg.append("rect")
    .attr("width", width)
    .attr("height", height)
    .attr("fill", "none")
    .attr("pointer-events", "all")
    .call(zoom);

var xGroup = g.append("g")
    .attr("transform", "translate(0," + height + ")");

g.append("clipPath")
    .attr("id", "clip")
    .append("rect")
    .attr("width", width)
    .attr("height", height);

function highlightPath(d) {
        if (!isVisible(d.id)) return;

d3.selectAll(".city path")
        .filter(function (e) { return e == d; })
        .style("stroke-width", 3);
        
        d3.selectAll(".city path")
        .filter(function (e) { return d != e; })
        .style("stroke", "lightgrey");

d3.selectAll(".city path")
        .sort(function (a, b) { // bring to front
            if (a != d) return -1;
            else return 1;
        });
  }

function colorPathsNormally() {
        d3.selectAll(".city path")
        .style("stroke", function(e) { return z(e.id); })
        .style("stroke-width", 1);
  }

city.append("text")
      .datum(function(d) { return {id: d.id, value: d.values[d.values.length - 1]}; })
      .attr("transform", function(d) { return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")"; })
      .attr("x", 3)
      .attr("dy", "0.35em")
      .style("font", "10px sans-serif")
      .style("cursor", "pointer")
      .text(function(d) { return d.id; })
      .on("click", function(d) {
            toggleVisibility(d.id);
            d3.selectAll(".city path")
            .filter(function(e) { return d.id == e.id; })
            .style("opacity", isVisible(d.id) ? 1 : 0);
            if (!isVisible(d.id)) {
                colorPathsNormally();
            }
      })
      .on("mouseover", function(d) {
          d3.selectAll(".city path")
          .filter(function(e) { return e.id == d.id; })
          .each(function(e) { highlightPath(e); });
      })
      .on("mouseout", function(d) {
          colorPathsNormally();
      })
      ;

var xExtent = d3.extent(data, function(d) { return d.date; });
      zoom.translateExtent([[x(xExtent[0]), -Infinity], [x(xExtent[1]), Infinity]])
      zoomRect.call(zoom.transform, d3.zoomIdentity);
});

function type(d, _, columns) {
  d.date = parseTime(d.date);
  for (var i = 1, n = columns.length, c; i < n; ++i) d[c = columns[i]] = +d[c];
  return d;
}

</script>

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