interactive-vis-course/Week11/africa_map_clicker.html at gh-pages · arnicas/interactive-vis-course · GitHub

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<!DOCTYPE html>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<style>


body {
    font-family: Helvetica, sans-serif;
    padding: 40px;
}

.countries {
    stroke: #fff;
    stroke-width:2px;
}

.legendLinear text {
    font-size: 9px;
}

#info {
    position: absolute;
    top: 300px;
    left: 50px;
    width: 150px;
    border: 1px gray dotted;
    margin: 15px;
    text-align: center;
}

p.country {
    font-size: 1.2em;
    font-weight: bolder;
    color: "steelblue";
}
p.rate {
    font-size: 1em;
    font-weight: bolder;
    fcolor: "steelblue";
}

</style>
<body>

    <h2>Fertility Rates in Africa</h2>

    <p>Source: World Bank (excerpted)</p>

    <div id="vis"></div>

    <div id="info">
        <p class="country">Click a country!</p>
        <p class="rate"></p>
    </div>

<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/queue.v1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3-legend/1.9.0/d3-legend.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>

<script>

var width = 1000,
    height = 600;

var svg = d3.select("#vis").append("svg")
    .attr("width", width)
    .attr("height", height);

var dateFormat = d3.time.format("%Y");

var projection = d3.geo.mercator()
    .scale(400) // mess with this if you want
    .translate([width / 2, height / 2]);

var path = d3.geo.path()
    .projection(projection);

var colorScale = d3.scale.linear().range(["#fee0d2", "#de2d26"]).interpolate(d3.interpolateLab);

var countryById = d3.map();
var data = [];
var filterValue = "2013";


// we use queue because we have 2 data files to load.
queue()
    .defer(d3.json, "data/topojson/africa.topojson")
    .defer(d3.csv, "data/World_Development_Indicators_Metadata_Countries.csv", makeLookup)
    .defer(d3.csv, "data/fertility_long_africa.csv", typeFertility) // process
    .await(loaded);

function typeFertility(d) {
    d.fertility = +d.Fertility;
    d.year = dateFormat.parse(d.Year);
    d.country = d.Country;
    return d;
}

function makeLookup(d) {
    countryById.set(d.ISO3, d);
    return d;
}

function getData(d) {
    var dataRow = countryById.get(d.properties.adm0_a3_is); // best match
    var dataVal = null;
    // must be a more elegant way to do this with all the checks, but i"m tired
    if (dataRow) {
        dataVal = data.get(dataRow.ShortName);
    }
    if (dataVal) {
        console.log("dataVal shortname", dataVal[0].Country);
        dataVal = dataVal.filter(function (d) {
            return d.Year == filterValue;
        });
    }
    if (dataVal) {
        dataVal = dataVal[0];
    }
    return dataVal;
}

function getColor(d) {
    var dataVal = getData(d);
    if (dataVal) {
        return colorScale(dataVal.fertility);
    }
    // if we fall through, i.e., no match
    //console.log("no dataRow", d);
    return "#ccc";
}

function loaded(error, africa, codes, fertility) {

    //console.log(africa);
    //console.log(codes);
    //console.log(fertility);

    // this construction creates a hash lookup for the country to values
    data = d3.nest()
        .key(function(d) {
            return d.Country;
        })
        .map(fertility, d3.map);

    //console.log("map result", data.get("Afghanistan"));

    colorScale.domain(d3.extent(fertility, function(d) {
        if (d.Year == filterValue) return d.fertility;}));

    var countries = topojson.feature(africa, africa.objects.collection).features;

    svg.selectAll("path.countries")
        .data(countries)
        .enter()
        .append("path")
        .attr("class", "countries")
        .attr("d", path)
        .attr("fill", function(d,i) {
            return getColor(d);
        })
        .on("click", showInfo)
        .on("mouseover", function(d) {
            d3.select(this).moveToFront();
            d3.select(this).style("stroke", "black");
        })
        .on("mouseout", function(d) {
            d3.select(this).style("stroke", "#fff");
        })
        .append("title")
        .text("Click me!");

    // The d3-legend component is called here:

    var linear = colorScale;

    svg.append("g")
      .attr("class", "legendLinear")
      .attr("transform", "translate(20,20)");

    var legendLinear = d3.legend.color()
      .shapeWidth(30)
      .orient("horizontal")
      .scale(linear);

    svg.select(".legendLinear")
      .call(legendLinear);

}

function showInfo(d) {
    //console.log(getText(d));
    var dataVal = getData(d);
    if (dataVal) {
        d3.select("#info p.country").html(dataVal.country);
        d3.select("#info p.rate").html(dataVal.fertility);
    } else {
        d3.select("#info p.country").html(d.properties.name);
        d3.select("#info p.rate").html("no data available.");
    }
}

d3.selection.prototype.moveToFront = function() {
  return this.each(function(){
    this.parentNode.appendChild(this);
  });
};

</script>
</body>
</html>