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Doping in Cycling - D3 Scatterplot

A Pen By Luke Walker

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HTML

            
              <div id="container">
  <div id="chartcontainer">
    <div id="title">
      <h1>Doping in Professional Cycling</h1>
      <h2>35 Fastest times up Alpe d'Huez</h2>
    </div>
    <div id="chart"></div>  
  </div>
  <div id="credits">Code by <a href="http://lukewalker.org" target="_blank">Luke Walker</a> as my solution for this <a href="https://www.freecodecamp.com/challenges/visualize-data-with-a-scatterplot-graph" target="_blank">Free Code Camp project</a>. See all my Data Visualization Projects and notes on <a href="https://ubershibs.github.io/dataviz/">Github</a>.</div>
  <div id="notes">
    <h2>Notes & References</h2>
    <ul>
      <li>Relied on <a href="https://bl.ocks.org/d3noob/6f082f0e3b820b6bf68b78f2f7786084" target="_blank">this scatterplot example</a> as the basic pattern.</li>
      <li><a href="https://bl.ocks.org/d3noob/23e42c8f67210ac6c678db2cd07a747e">This example</a> was helpful with axis labelling</li>
      <li><a href="http://zeroviscosity.com/d3-js-step-by-step/step-3-adding-a-legend" target="_blank">This example</a> was helpful when it came to adding a legend.</li>
    </ul>
  </div>
</div>
!

CSS

            
              body {
  background-color: lightgray;
 }

#chart {
  width: 800px;
  margin: 10px auto;
}

#notes {
  font-family: sans-serif;
  width: 700px;
  margin: 10px auto;
  padding-left: 50px;
}

#notes h2 {
  display: block;
  font-size: 20px;
  font-weight: 700;
  padding: 10px 0;
}

#notes ul {
  list-style-type: disc;
}

#notes li {
  margin-left: 20px
}

#credits {
  font-family: sans-serif;
  font-size: 14px;
  width: 850px;
  text-align: center;
  margin: 20px auto;
  border: 1px solid black;
  padding: 5px;
  background-color: white;
}

.line {
  fill: none;
  stroke: none;
  stroke-width: 0;
}

.axisLabel {
  font-family: sans-serif;
}

#title h1 {
  font-size: 30px;
  font-family: sans-serif;
  text-align: center;
  width: 100%;
}

#title h2 {
  font-family: sans-serif;
  font-size: 20px;
  margin-top: 15px;
  width: 100%;
  text-align: center;
}

#chartcontainer {
  margin-top: 20px;
}

.legend {
  font-size: 16px;
  font-family: sans-serif;
}

circle {
  stroke-width: 2;
}

.name {
  font-family: sans-serif;
  font-size: 12px;
}

.tooltip {
  position: absolute;
  text-align: center;
  width: 200px;
  height: auto;
  padding: 10px 5px;
  font: 16px sans-serif;
  background: #999;
  border: 0px;
  border-radius: 8px;
  display: none;
  opacity: 0.9;
  color: white;
}

.tooltip div {
  margin: 10px auto;
}


.mouseover {
  fill: white;
  stroke: black;
  stroke-width: 2;
  r: 10;
  font-family: sans-serif;
  font-size: 12px;
}

#chart {
  background-color: white;
  border: 1px solid black;
}
!

JS

            
              var dataUrl = 'https://raw.githubusercontent.com/FreeCodeCamp/ProjectReferenceData/master/cyclist-data.json';
var margin = {top: 30, right: 100, bottom: 30, left: 30},
    width = 700 - margin.left - margin.right,
    height = 600 - margin.top - margin.bottom;

var tooltip = d3.select('body').append("div").attr("class", "tooltip");

var secondsToMinutes = function(s) {
  var minutes = Math.floor(s/ 60);
  var seconds = s % 60;
  if (seconds < 10) {
    seconds = '0' + seconds;
  }
  return(minutes + ':' + seconds);
}

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

var valueline = d3.line()
    .x(function(d) { return x(d.Seconds); })
    .y(function(d) { return y(d.Place); });

var svg = d3.select("#chart").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

$.get(dataUrl, function(response, status) {
  
  var data = JSON.parse(response);
  var zeroTime = data[0].Seconds; 

  data.forEach(function(d) {
    d.Seconds = d.Seconds - zeroTime;
    d.Place = +d.Place;
    if (d.Doping != '') {
      d.legend = "Doping allegations";
    } else {
      d.legend = "No doping allegations";
    }
  });
  
  x.domain([200, 0]);
  y.domain([1, 36]);
  
  svg.append("path")
    .data([data])
    .attr("class", "line")
    .attr("d", valueline);
 
  svg.selectAll("dot")
    .data(data)
    .enter().append("circle")
      .attr("r", 5)
      .attr("fill", function(d, i) { return color(d.legend); })
      .attr("cx", function(d) { return x(d.Seconds); })
      .attr("cy", function(d) { return y(d.Place); })
      .on("mouseover", showTip)
      .on("mouseout", hideTip);
  
  svg.selectAll("text")
    .data(data)
    .enter().append("text")
      .text(function(d) {
        return d.Name;
      })
      .attr("class", "name")
      .attr("x", function(d) { return x(d.Seconds); })
      .attr("y", function(d) { return y(d.Place); })
      .attr("transform", "translate(10,7)")
      .on("mouseover", showTip)
      .on("mouseout", showName);

  
  svg.append("g")
    .attr("transform", "translate(0," + height + ")")
 .call(d3.axisBottom(x)
       .ticks(5)
       .tickFormat(secondsToMinutes));
  
  svg.append("text")
    .attr("y", height - 20)
    .attr("x", width - 210)
    .attr("dy", "1em")
    .attr("class", "axisLabel")
    .text("Minutes Behind Fastest Time");  
  
  svg.append("g")
    .call(d3.axisLeft(y))
  
  svg.append("text")
    .attr("transform", "rotate(90)")
    .attr("y", -20)
    .attr("x", 0)
    .attr("dy", "1em")
    .attr("class", "axisLabel")
    .text("Rank");
 
 var legend = svg.selectAll('.legend')
   .data(color.domain())
   .enter()
   .append('g')
   .attr('class', 'legend')
   .attr('transform', function(d, i) {
     var height = 20;
     var horz = 400;
     var vert = i * height + 300;
     return 'translate(' + horz + ',' + vert + ')';
   });

  legend.append('circle')
    .attr('r', 5)
    .style('fill', color)
    .style('stroke', color);

  legend.append('text')
    .attr('x', 10)
    .attr('y', 5)
    .text(function(d) { return d; });
});


function showTip(d) {
  var circle = d3.select(this);
  circle.attr("class", "mouseover");
  tooltip.html('<div>' + d.Name + ', ' + d.Nationality + '</div><div>Year: ' + d.Year + ', Time: ' + d.Time + '</div><div>' + d.Doping + '</div>' )
  .style('left', (d3.event.pageX + 10) + 'px')
  .style('top', (d3.event.pageY + 10) + 'px')
  .style('display', 'block');
}

function hideTip(d) {
  var circle = d3.select(this);
  circle.attr('class', 'circle')
  tooltip.style('display', 'none');
}

function showName(d) {
  var name = d3.select(this);
  name.attr('class', 'name')
  tooltip.style('display', 'none');
}
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