Specialization Index chart

Readme.md

Custom chart to show the Specialization Index in a series of Universitites

Specialization Index

In bilbiometrics, the SI is an indicator that describes the intensity of research of an entity (e.g., an institution) in a given related field relative to the intensity of the country or world in the same field.

code.js

// extend d3 to be able to wrap long texts. textUnits: em || px
d3.wrap = function(text, width, textUnits) {
  text.each(function() {
    var text = d3.select(this),
        words = text.text().split(/\s+/).reverse(),
        word,
        line = [],
        lineHeight = (textUnits == 'em'? 1.1 : 15), // ems
        y = text.attr("y"),
        parsedDy = parseFloat(text.attr("dy")),
        dy = (isNaN(parsedDy)? 0 : parsedDy),
        tspan = text.text(null).append("tspan").attr("x", 0).attr("y", y).attr("dy", dy + textUnits),
        numPrevTspans;
    while (word = words.pop()) {
      line.push(word);
      tspan.text(line.join(" "));
      if (tspan.node().getComputedTextLength() > width) {
        line.pop();
        tspan.text(line.join(" "));
        line = [word];
        numPrevTspans = text.selectAll("tspan").size();
        tspan = text.append("tspan").attr("x", 0).attr("y", y).attr("dy", lineHeight*numPrevTspans + dy + textUnits).text(word);
      }
    }
  });
}





////////////////////////////////////////////////////////
// relevant stuff, here


var data,
    listUniversities,
    selectedUniversity,

    // property attributes
    areaNameLabel = 'areaName',
    univNameLabel = 'univName',
    specializationIndexLabel = 'specializationIndex',

    //svg stuff
    svg,
    margin,
    width,
    height,
    x,
    y,
    xAxisBottom,
    xAxisTop,
    transition_duration,
    yAxis,
    colorAbove,
    colorBelow;



// load data and boostrap
d3.json('universities_SI.json', function(data) {
    setup();
    prepareData(data);
    createCombobox();
})




var setup = function() {        
    // svg settings
    margin = {top: 90, right: 50, bottom: 60, left: 0},
    width = 600 - margin.left - margin.right,
    height = 470 - margin.top - margin.bottom,
    transition_duration = 500;

    x = d3.scale.log()
        .base(2)
        .range([0, width]);
    
    y = d3.scale.ordinal()
        .rangeRoundBands([0, height], 0.1)      

    xAxisBottom = d3.svg.axis()
        .scale(x)
        .orient("bottom")
        .tickFormat(function(d) { return d; });

    xAxisTop = d3.svg.axis()
        .scale(x)
        .orient("top")
        .tickFormat(function(d) { return d; });

    yAxis = d3.svg.axis()
        .scale(y)
        .orient("left")
        .tickSize(0)
        .tickPadding(6);        

    svg = d3.select("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
        .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
    
    // create top and bottom axis
    svg.append("g")
        .attr("class", "x axis bottom")
        .attr("transform", "translate(0," + height + ")");

    svg.append("g")
        .attr("class", "x axis top");
};



var createCombobox = function() {
    //add selector
    var select = d3.select('#select-placeholder')
        .append('select')
        .attr('class','select')
        .on('change',function() {
            onChange(d3.select('select').property('value'));
        })

    var options = select
        .selectAll('option')
            .data(listUniversities).enter()
            .append('option')
            .text(function (d) { return d; });
}



var onChange = function(newValue) {    

    selectedUniversity = newValue;

    console.log("new value");

    // remove previous stuff. Not useful
    // to do transitions here
    svg.selectAll('.group_field').remove();
    d3.select('svg').selectAll('.si-threshold-label').remove();

    // render the viz with the filtered data
    render(
        _.filter(data, function(d) {
            return d[univNameLabel] == selectedUniversity;
        })  
    );
}



var prepareData = function(dataset) {
    // add univName property to those records containing
    // data at possible national level
    dataset[0].forEach(function(d) {
        d[univNameLabel] = 'National level';
    });

    data = _.concat(dataset[0], dataset[1]);

    // get list of universities
    listUniversities = _(data)
        .uniqBy(univNameLabel)                  
        .map(univNameLabel)                     
        .value();

    // auto select first option (national data)
    onChange(listUniversities[0]);
}



var updateBars = function(data, selection)
{
    //update
    var gs = selection
        .data(data, function(d) { return d[areaNameLabel]; })
        .enter()
        .append('g')
        .attr('class', 'group_field')
        .attr('transform', function(d) {
            // move all the 'g' to the x(1): those 'g'
            // with S.I value < 1 will be animated later                                    
            return 'translate(' + x(1) + ' , ' + y(d[areaNameLabel]) + ')';
        })        
    
    // for those bars going to the 
    // reverse duration, animate them
    gs.filter(
        function(d) {
            return d[specializationIndexLabel] < 1;
        }
    )
    .transition()
    .duration(transition_duration)
    .attr('transform', function(d) {
        return 'translate(' + x(d[specializationIndexLabel]) + ' , ' + y(d[areaNameLabel]) + ')';
    })

    gs.append('rect')
        .attr('class', 'bar')
        .attr('fill', function(d, i) {
            var multiple = d[specializationIndexLabel];
            return (multiple >= 1)? colorAbove(multiple) : colorBelow(multiple);
        })
        .attr('width', 0)
        .attr("height", function(d) {
            return y.rangeBand() ;
        })
        // save final width of the bar as 
        // we need this datum to positionate
        // the texts accordingly
        .attr('final_width', function(d) {
            return (d[specializationIndexLabel] >= 1)?    x(d[specializationIndexLabel]) - x(1) : x(1) - x(d[specializationIndexLabel]);
        })
        .transition()
        .duration(transition_duration)
        .attr("width", function(d) { 
            return (d[specializationIndexLabel] >= 1)?    x(d[specializationIndexLabel]) - x(1) : x(1) - x(d[specializationIndexLabel]);
        });

    gs.append('text')
        .attr('class', 'areaName')
        .attr('opacity', 0)
        .attr('y', y.rangeBand()/2)
        .attr('alignment-baseline', 'middle')
        .attr('x', function(d) {
            return (d[specializationIndexLabel] >= 1)?    -5 : +d3.select(this.parentNode).select('rect').attr('final_width') + 5;
        })
        .style('text-anchor', function(d) {
            return (d[specializationIndexLabel] >= 1)? 'end' : 'start';
        })
        .text(function(d) {
            return d[areaNameLabel];
        })
        .transition()
        .delay(transition_duration / 2)
        .attr('opacity', 1);
}



var render = function(data) {
    data = _(data)
        .sortBy(specializationIndexLabel)
        .reverse()
        .value();

    // for those values greater than 1: 2 means that the SI is 2 times more
    // for those values less than 1: 0.5 means that the SI is 2 times less, 0.25 means that the SI is 4 times less

    var extentValues = [
        0.1,
        1 + d3.max(data, function(d) { 
            return d[specializationIndexLabel];
        })
    ];

    //two color scales for the bars:
    //one for values that are above 0: from grey (0) to green (values)
    //one for values that are below 0: from grey (0) to red (values)
    colorAbove = d3.scale.linear().domain([0, extentValues[1]]).range(['#F2D516', '#20B2AA']);
    colorBelow = d3.scale.linear().domain([0,1]).range(['#DC143C', '#F2D516']);

    x.domain(extentValues).nice();
    y.domain(data.map(function(d) { 
        return d[areaNameLabel];
    }));

    // one set of bars to show specialization index
    updateBars(data, svg.selectAll(".bar-specialization_index"));

    // vertical line with at 1, which is the threshold
    // that defines whether you are specialized or not
    svg.append('line')
        .attr('class', 'si-threshold')
        .attr('x1', x(1))
        .attr('x2', x(1))
        .attr('y1', 0)
        .attr('y2', height);
    
    // contine the previous line above the top axis,
    // draw outside the svg group
    var label_y_offset = -70;
    svg
        .append('line')
        .attr('class', 'si-threshold-label')
        .attr('x1', margin.left + x(1))
        .attr('x2', margin.left + x(1))
        .attr('y1', label_y_offset)
        .attr('y2', 0);
    
    svg
        .append('circle')
        .attr('class', 'si-threshold-label')
        .attr('r', 3)
        .attr('cx', margin.left + x(1))
        .attr('cy', label_y_offset)

    svg
        .append('text')
        .attr('class', 'si-threshold-label')
        .attr('x', margin.left + x(1))
        .attr('y', label_y_offset)
        .text('The value 1 represents the reference point defining whether if there is more or less specialization');
    
    svg.select('text.si-threshold-label')
        .call(d3.wrap, 200, 'px');

    d3.select('svg text.si-threshold-label')
        .selectAll('tspan')
        .attr('x', margin.left + x(1) + 5);

    svg.select(".x.axis.top")
        .transition()
        .duration(200)
        .call(xAxisTop);
    svg.select(".x.axis.bottom")
        .transition()
        .duration(200)
        .call(xAxisBottom);
}

d3.v3.min.js

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index.html

<!DOCTYPE html>
<html>
<meta charset="utf-8">
<head>
	<style>
	body {
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lodash.min.js

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thumbnail.png

universities_SI.json

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