JSFiddle - React, Tailwind, and code Playground

by nrabinowitz

HTML

<script src="http://d3js.org/d3.v3.min.js"></script>
<div style="display:none"...

CSS

svg {
  font: 10px sans-serif;
}

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

.brush .extent {
  stroke: #fff;
  fill-opacity: .125;
  shape-rendering: crispEdges;
}

JavaScript

var margin = {top: 10, right: 10, bottom: 100, left: 60},
    margin2 = {top: 430, right: 10, bottom: 20, left: 60},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom,
    height2 = 500 - margin2.top - margin2.bottom;


var x = d3.scale.linear().range([0, width]),
    x2 = d3.scale.linear().range([0, width]),
    y = d3.scale.linear().range([height, 0]),
    y2 = d3.scale.linear().range([height2, 0]);

var xAxis = d3.svg.axis().scale(x).tickSubdivide(true).tickFormat(d3.format('f')),
    xAxis2 = xAxis,
    yAxis = d3.svg.axis().scale(y).orient("left").tickFormat(d3.format('s'));

var brush = d3.svg.brush()
    .x(x2)
    .on("brush", brush);

var area = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x(d.wl); })
    .y0(height)
    .y1(function(d) { return y(d.intensity); });
    
    


var area2 = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x2(d.wl); })
    .y0(height2)
    .y1(function(d) { return y2(d.intensity); });





var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom);

var defs = svg.append("defs");

defs.append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);

var focus = svg.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var context = svg.append("g")
    .attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");

// set up gradient elements
var gradient = defs.append('linearGradient')
    .attr('id', 'spectrumGradient');

// set up gradient scale
var gx = d3.scale.linear().range([0, 1]);

function processCSV(data) {

    data.forEach(function(d) {
    d.wl = +d.wl;
    d.intensity = +d.intensity;
    });
    
    x.domain(d3.extent(data.map(function(d) { return d.wl; })));
    y.domain([0, d3.max(data.map(function(d) { return d.intensity;...