JSFiddle - React, Tailwind, and code Playground

by amfy10

HTML

<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/d3.geom.contour.v0.min.js"></script>

CSS

.axis text {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.axis path {
  display: none;
}

.isoline {
  fill: none;
}

JavaScript

var margin = {top: 20, right: 20, bottom: 30, left: 30},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.linear()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

var color = d3.scale.linear()
    .domain([95, 135,155,195])
    .range(["green","yellow", "yellow","red"])
    .interpolate(d3.interpolateRgb);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .ticks(20);

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var svg = d3.select("body").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 + ")");

console.log(svg.style("width"));

d3.json("https://gist.githubusercontent.com/mbostock/4241134/raw/2396364632e6349d85f43078e368bdc17d59e39f/readme-heatmap.json", function(error, heatmap) {
  var dx = heatmap[0].length,
      dy = heatmap.length;

  x.domain([0, dx]);
  y.domain([0, dy]);
  
  
  datarange = d3.extent(d3.merge(heatmap));
  domains = d3.scale.ordinal().domain(d3.range(200))
      .rangePoints(datarange, 0).range();
  
  svg.selectAll(".isoline")
      .data(domains.map(isoline))
    .enter().append("path")
      .datum(function(d) { return d3.geom.contour(d).map(transform); })
      .attr("class", "isoline")
      .attr("d", function(d) { return "M" + d.join("L") + "Z"; })
      .style("fill", function(d, i) { return color(domains[i]); });

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis);

  var zoomer = d3.behavior.zoom().on("zoom", zoom);


  svg.call(zoomer); 
  var currentscale = 1;
  
  function isoline(min) {
    return function(x, y) {
      return x >= 0 && y >= 0 && x < dx && y < dy && heatmap[y][x] >= min;
    };
  }

 ...