JSFiddle - React, Tailwind, and code Playground

by amfy10

HTML

<pre...

CSS

pre#data {display:none;}
svg {
  font: 10px sans-serif;
}

.area {
  fill: steelblue;
  clip-path: url(#clip);
}

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

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

JavaScript

function brushed() {
  x.domain(brush.empty() ? x2.domain() : brush.extent());
  focus.select(".area").attr("d", area);
  focus.select(".x.axis").call(xAxis);
}

function type(d) {
  d.V1 = +d.V1;
  d.V2 = +d.V2;
  return d;
}


var margin = {top: 10, right: 10, bottom: 100, left: 40},
    margin2 = {top: 430, right: 10, bottom: 20, left: 40},
    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).orient("bottom"),
    xAxis2 = d3.svg.axis().scale(x2).orient("bottom"),
    yAxis = d3.svg.axis().scale(y).orient("left");

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

var area = d3.svg.line()
    .interpolate("cardinal")
    .x(function(d) { return x(d.V1); })
    .y(function(d) { return y(d.V2); });

var area2 = d3.svg.line()
    .interpolate("cardinal")
    .x(function(d) { return x2(d.V1); })
    .y(function(d) { return y2(d.V2); });

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

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

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

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

var data = d3.tsv.parse( d3.select("pre#data").text() )

x.domain(d3.extent(data.map(function(d) { return d.V1; })));
y.domain([0, d3.max(data.map(function(d) { return d.V2; }))]);
x2.domain(x.domain());
y2.domain(y.domain());

focus.append("path")
    ...