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HTML

              
                <h1 id='title'>Video Game Sales</h1>
<h2 id='description'>100 Most Sold Video Games, grouped by platform</h2>
<div id='container'>
  <div id='legend'></div>
  <svg id='svg' preserveAspectRatio='xMidYMid meet'></svg>
</div>
              
            
!

CSS

              
                body{
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#container {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  width: 100%;
}


h2{
  font-size: 20px;
  font-weight: normal;
}

svg {
  transition: 500ms;
  transform-origin: 50% 50%;
  * {
    transition: opacity 500ms;
  }
}

.leaf-text{
  text-anchor: middle;
}

#legend {
  display: flex;
  flex-direction: column;
  p {
    padding: 0 10px;
    font-size: 14px;
    margin: 5px 0;
  }
}

.legend-item {
  display: flex;
  flex-direction: row;
  justify-content: start;
  align-items: center;
  padding: 0 5px;
  *{
    pointer-events: none;
  }
  &:hover {background-color: #e0e0e0;}
}

.legend-color {
  height: 10px;
  width: 20px;
}
@media screen and (max-width: 700px), screen and (max-height: 700px){
  #container {
    flex-direction: column-reverse;
  }
  #legend {
    flex-direction: row;
    flex-wrap: wrap;
    padding: 0;
    p{
      font-size: 12px;
    }
  }
}
circle {
  cursor: pointer;
}

text,
tspan {
  pointer-events: none;
}

.over {
  stroke-width: 3px;
  stroke: silver;
}
              
            
!

JS

              
                const DATA_URL='https://cdn.rawgit.com/freeCodeCamp/testable-projects-fcc/a80ce8f9/src/data/tree_map/video-game-sales-data.json';

function get(url){
  return new Promise((resolve,reject)=>{
    var req=new XMLHttpRequest();
    req.open('GET',url,true);
    req.onload=()=>{
      if(req.status==200) resolve(JSON.parse(req.response));
      else reject(Error(req.statusText));
    };
    req.onerror=()=>{
      reject(Error("Network Error"));
    };
    req.send();
  });
}

get(DATA_URL).then(response=>build(response));

function build(data){
  var clickState='standby';
  const w=600;
  const h=600;
  const padding=10;
  //identifiers
  let svg = d3.select('svg')
    .attr('width',w)
    .attr('height',h)
    .attr('viewBox','0 0 '+w+' '+h)
    //.style('height',window.innerWidth<window.innerHeight?'80vw':'80vh')
    //.style('width',window.innerWidth<window.innerHeight?'80vw':'80vh')
  
  document.addEventListener('click',()=>{
    if (clickState==='clicked') clickState='zoomed';
    else if (clickState=='zoomed') {
      clickState='standby';
      d3.select('svg').attr('viewBox','0 0 '+w+' '+h);
    }
  })
  //hierarchy
  let root=d3.hierarchy(data);
  let layout=d3.pack();
  layout
    .size([w,h])
  //must apply sum() to hierarchy before passing to layout
  root.sum(d => d.value);
  //pass hierarchy to layout
  layout(root);
  //draw
  svg.selectAll('g')
    .data(root.descendants())
    .enter()
    .append('g')
    .attr('class',d=>'platform-'+(d.data.category?d.data.category:d.data.name))
    .classed('hasText',d=>(d.children===undefined)) //only children show text
    .attr('transform',d=>'translate('+[d.x,d.y]+')')
    .append('circle')
    .attr('class',d=>'platform-'+(d.data.category?d.data.category+' leaf':d.data.name+' category'))
    .style('fill',d=>color(d.data))
    .attr('r',d=>d.r)
    .on('mouseenter',function(d){
      let cat=d3.select(this).attr('class').split(' ')[0];
      d3.select('g.'+cat+':not(.hasText)').classed('over',true);
      d3.select('#legend')
        .select('.'+cat)
        .style('background-color','#e0e0e0');
    })
    .on('mouseleave',function(d){
      let cat=d3.select(this).attr('class').split(' ')[0];
      let trans=d3.select('g.'+cat+':not(.hasText)').attr('transform').split(' ')[0];
      d3.select('g.'+cat+':not(.hasText)').classed('over',false)
      d3.select('#legend')
        .select('.'+cat)
        .style('background-color','transparent');
    })
    .on('click',function(){
      if (clickState==='standby'){
        clickState='clicked';
        let category=d3.select(this).attr('class').split(' ')[0];
        let bbox=d3.select('circle.'+category+':not(.hasText)')
          .node().getBoundingClientRect();
        let svgBox=svg.node().getBoundingClientRect();
        svg.attr('viewBox',[
          bbox.x-svgBox.x-bbox.width/4,
          bbox.y-svgBox.y-bbox.height/4,
          bbox.width*1.5,
          bbox.height*1.5
        ].join(' '));
      }
    })
  //only children have text
  svg.selectAll('g.hasText')
    .classed('tile',true)
    .attr('data-name',d=>d.data.name)
    .attr('data-category',d=>d.data.category)
    .attr('data-value',d=>d.data.value)
    .append('text')
    .attr('y',d=>textYPos(d.data.name,textSize(d.data.name,d.r))-1)
    .attr('class',d=>'platform-'+d.data.category)
    .style('font-size',d=>textSize(d.data.name,d.r)+'px')
    .style('pointer-events','none')
    .selectAll('tspan')
    .data(d=>textWrap(d.data.name, textSize(d.data.name,d.r), d.data.category))
    .enter()
    .append('tspan')
    .attr('class',d=>'platform-'+d.platform)
    .classed('leaf-text', true)
    .attr('x',0)
    .attr('dy',d=>d.size)
    .text(d=>d.text);
  
  //markup legend
  let entries = d3.select('#legend')
    .selectAll('div')
    .data(root.children)
    .enter()
    .append('div')
    .attr('class',d=>'platform-'+d.data.name)
    .classed('legend-item',true)
    .on('mouseenter',function(d){
      svg.selectAll(':not(.platform-'+d.data.name+')')
        .style('opacity','0.4')
    })
    .on('mouseleave',function(d){
      svg.selectAll(':not(.platform-'+d.data.name+')')
        .style('opacity','1')
    });
  
  entries.append('div')
    .classed('legend-color',true)
    .style('background-color',d=>color(d.data));
  entries.append('p')
    .classed('legend-text',true)
    .html(d=>d.data.name);

}
// y position offset of text block
function textYPos(text,size){
  let textArray=textWrap(text);
  return (textArray.length*(size/2))*-1;
}
//scale font-size with radius and number of tspan lines
function textSize(text,radius){
  let textArray=textWrap(text);
  let multiplier = textArray.length > 4 ? 4.5/textArray.length : 1;
  return (radius/3)*multiplier;
}
//wrap text -- complex
function textWrap(str,size,platform){
  return round(format(str,size,platform));
  
  //use regex to format str into tspans
  function format(str,size,platform){
    if (/\s/g.test(str)){
      return str
        .replace(/\s+/g, ' ') //first remove redundant spaces to clean data
        //refine split rules
        .replace(/(\b\S{1,4}\b)\s(\b\S{1,3}\b)/g,'$1%%$2')
        //4w 3w
        .replace(/([^%]{2})(\b.{1,3}\b)\s(\b\S{1,4}\b)/g,'$1$2%%$3')
        //3w 4w
        .replace(/(\b[\w\d]{1,6}\b)\s(\d)/g, '$1%%$2')
        //single digits after space
        .replace(/(\b[\w\d]+\b)%%(\b[\w\d]+\b)%%(\b[\w\d]+\b)/g,'$1%%$2 $3')
        //stop multiple breaks
        .replace(/(\b[\w\d]+\b\/)(\b[\w\d]{4,}\b)/g, '$1 $2')
        // split after slash
        .replace(/(\b[\w\d]{5,}\b)([\w\d]{5,})\b/g, '$1- $2')
        //split long words
        .replace(/:%%/g, ': ')
        .split(' ')
        .map((d,i)=>({
          y: i*15,
          text: d.replace(/%%/g,' '),
          size: size,
          value: 1,
          platform: platform
        }));
    } 
    else return [{
      y: 0,
      text: str,
      size: size,
      platform: platform
    }];
  }
  //round out the tspan lengths to fit the circle
  function round(data){
    if(data.length<6) return data; //only check texts longer than six words
    let lowest = findLowest(data); //find index of smallest tspan
    if(data[lowest].text.length>5) return data; // do nothing if smallest tspan is big
    return round(merge(data,lowest,compareNeighbors(data,lowest-1,lowest+1)));

    function findLowest(data){
      var indexLowest=1;
      for(let i=1;i<data.length-1;i++){
        if(data[i].text.length<data[indexLowest].text.length){
          indexLowest = i;
        }
      }
      return indexLowest;
    }    
    function compareNeighbors(data,prev,next){
      if (data[prev].value < data[next].value) return prev;
      else if (data[prev].value > data[next].value) return next;
      else {
        if (data[prev].text.length < data[next].text.length) return prev;
        else if(data[prev].text.length > data[next].text.length) return next;
        else {
          if (prev < data.length/2) return next;
          else return prev;
        }
      }
    }
    function merge(data,base,merger){
      var i;
      var next;
      if(merger<base){
        i=merger;
        next=base;
      } else {
        i=base;
        next=merger;
      }
      data[i].value += 1;
      data[i].text = data[i].text.concat(' '+data[next].text);
      data.splice(next,1);
      return data;
    }
    
  }
  
}
//color switch based on console string
function color(data){
  var f=360/19;
  return data.category ? check(data.category) : check(data.name);
  function check(str){
    switch (str) {
      case "Video Game Sales Data Top 100":
        return 'none';
      case "2600":
        return hslColor(f*2);
      case "Wii":
        return hslColor(f*3);
      case "NES":
        return hslColor(f*4);
      case "GB":
        return hslColor(f*5);
      case "DS":
        return hslColor(f*6);
      case "X360":
        return hslColor(f*7);
      case "PS3":
        return hslColor(f*8);
      case "PS2":
        return hslColor(f*9);
      case "SNES":
        return hslColor(f*10);
      case "GBA":
        return hslColor(f*11);
      case "PS4":
        return hslColor(f*12);
      case "3DS":
        return hslColor(f*13);
      case "N64":
        return hslColor(f*14);
      case "PS":
        return hslColor(f*15);
      case "XB":
        return hslColor(f*16);
      case "PC":
        return hslColor(f*17);
      case "PSP":
        return hslColor(f*18);
      case "XOne":
        return hslColor(f*19);
      default:
        return false;
    }
  }
  function hslColor(hue){
    return 'hsl('+(hue-1)+',70%,'+(data.category?'60%':'80%')+')'
  }
}
              
            
!
999px

Console