interactive-vis-course/Week11/africa_map3.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;
}


</style>
<body>

    <h2>Current Malaria Rates in Africa</h2>

    <p>Source: <a href="http://data.unicef.org/child-health/malaria.html">UNICEF</a>. Data shown is most recent data for countries with data available.</p>

    <div id="vis"></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 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();

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

function typeAndSet(d) {
    d.Total = +d.Total;
    countryById.set(d.ISO, d);
    return d;
}

function getColor(d) {
    var dataRow = countryById.get(d.properties.iso_a3);
    if (dataRow) {
        console.log(dataRow);
        return colorScale(dataRow.Total);
    } else {
        console.log("no dataRow", d);
        return "#ccc";
    }
}

function getText(d) {
 var dataRow = countryById.get(d.properties.iso_a3);
    if (dataRow) {
        console.log(dataRow);
        return dataRow.Country + ":" + dataRow.Total;
    } else {
        console.log("no dataRow", d);
        return d.properties.name + ": No data.";
    }
}

function loaded(error, africa, malaria) {

    console.log(africa);
    console.log(malaria);

    colorScale.domain(d3.extent(malaria, function(d) {return d.Total;}));

    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) {
            console.log(d.properties.name);
            return getColor(d);
        })
        .append("title")
        .text(function(d) {
            return getText(d);
        });


    // 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);

}

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