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HTML 

              
                <div id="chartArea"></div>

<h2>Simple Curved Line Chart</h2>
<h4>Built with D3 v4</h4>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Bree+Serif');

*{
  font-family: 'Bree Serif';
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: #f1f2f3;
  font-size: 12px
}

#chartArea {
  margin: 4em auto 2rem;
}

.y .tick line{
  stroke: #cfd8dc;  
}

.line {
  fill: none;
  stroke: #7460ee;
  stroke-width: 3px;
}
.area{
  fill: #7460ee;
  opacity: 0.3; 
}
.meanline{
  stroke: #7460ee;
  stroke-width: 2px;
  stroke-dasharray: .25rem;
}

.line2 {
  fill: none;
  stroke: #ffbb44;
  stroke-width: 3px;
}
.area2{
  fill: #ffbb44;
  opacity: 0.3; 
}
.meanline2{
  stroke: #ffbb44;
  stroke-width: 2px;
  stroke-dasharray: .25rem;
  stroke-width: 2px;
}

.bubble2{
  fill: #ffbb44;
}
!

JS 

              
                // data setup
openCloseData = [{
  "date": "1-May-16",
  "close": 558.13
}, {
  "date": "30-Apr-16",
  "close": 553.98
}, {
  "date": "27-Apr-16",
  "close": 567
}, {
  "date": "26-Apr-16",
  "close": 589.7
}, {
  "date": "25-Apr-16",
  "close": 599
}, {
  "date": "24-Apr-16",
  "close": 630.28
}, {
  "date": "23-Apr-16",
  "close": 666.7
}, {
  "date": "20-Apr-16",
  "close": 634.98
}, {
  "date": "19-Apr-16",
  "close": 645.44
}, {
  "date": "18-Apr-16",
  "close": 643.34
}, {
  "date": "17-Apr-16",
  "close": 543.7
}, {
  "date": "16-Apr-16",
  "close": 580.13
}, {
  "date": "13-Apr-16",
  "close": 605.23
}, {
  "date": "12-Apr-16",
  "close": 622.77
}, {
  "date": "11-Apr-16",
  "close": 626.2
}, {
  "date": "10-Apr-16",
  "close": 628.44
}, {
  "date": "9-Apr-16",
  "close": 636.23
}, {
  "date": "5-Apr-16",
  "close": 633.68
}, {
  "date": "4-Apr-16",
  "close": 624.31
}, {
  "date": "3-Apr-16",
  "close": 629.32
}, {
  "date": "2-Apr-16",
  "close": 618.63
}, {
  "date": "30-Mar-16",
  "close": 599.55
}, {
  "date": "29-Mar-16",
  "close": 609.86
}, {
  "date": "28-Mar-16",
  "close": 617.62
}, {
  "date": "27-Mar-16",
  "close": 614.48
}, {
  "date": "26-Mar-16",
  "close": 606.98
}];

// data setup
openCloseData2 = [{
  "date": "1-May-16",
  "close": 600
}, {
  "date": "30-Apr-16",
  "close": 590
}, {
  "date": "27-Apr-16",
  "close": 567
}, {
  "date": "26-Apr-16",
  "close": 542
}, {
  "date": "25-Apr-16",
  "close": 575
}, {
  "date": "24-Apr-16",
  "close": 564
}, {
  "date": "23-Apr-16",
  "close": 666.7
}, {
  "date": "20-Apr-16",
  "close": 650
}, {
  "date": "19-Apr-16",
  "close": 580
}, {
  "date": "18-Apr-16",
  "close": 541
}, {
  "date": "17-Apr-16",
  "close": 531
}, {
  "date": "16-Apr-16",
  "close": 575
}, {
  "date": "13-Apr-16",
  "close": 550
}, {
  "date": "12-Apr-16",
  "close": 564
}, {
  "date": "11-Apr-16",
  "close": 587
}, {
  "date": "10-Apr-16",
  "close": 579
}, {
  "date": "9-Apr-16",
  "close": 624
}, {
  "date": "5-Apr-16",
  "close": 621
}, {
  "date": "4-Apr-16",
  "close": 641
}, {
  "date": "3-Apr-16",
  "close": 557
}, {
  "date": "2-Apr-16",
  "close": 596
}, {
  "date": "30-Mar-16",
  "close": 685
}, {
  "date": "29-Mar-16",
  "close": 578
}, {
  "date": "28-Mar-16",
  "close": 565
}, {
  "date": "27-Mar-16",
  "close": 580
}, {
  "date": "26-Mar-16",
  "close": 592
}];

// set the dimensions and margins of the graph
var margin = {
    top: 20,
    right: 20,
    bottom: 30,
    left: 50
  },
  width = 420 - margin.left - margin.right,
  height = 300 - margin.top - margin.bottom;

// parse the date / time
var parseTime = d3.timeParse("%d-%b-%y");

// set the ranges
var x = d3.scaleTime().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);

// define the line
var valueline = d3.line()
  .curve(d3.curveCatmullRom)
  .x(function(d) {
    return x(d.date);
  })
  .y(function(d) {
    return y(d.close);
  });

// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3.select("#chartArea").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 + ")");


// yAxis
const yAxis = d3.axisLeft(y)
    .tickSizeInner(-width)
    .tickSizeOuter(0)
    .tickPadding(10);

const xAxis = d3.axisBottom(x).ticks(5);

const drawGraph = (data, data2) => {

  // format the data
  data.forEach(function(d) {
    d.date = parseTime(d.date);
    d.close = +d.close;
  });
  
  data2.forEach(function(d) {
    d.date = parseTime(d.date);
    d.close = +d.close;
  });
  

  const meanValue = d3.mean(data, (d) => {
    return d.close
  });
  
  const meanValue2 = d3.mean(data2, (d) => {
    return d.close
  });
  
  var meanLine = d3.line()
    .x((d) => { return x(d.date); })
    .y(() => { return y(meanValue); });
    var meanLine2 = d3.line()
    .x((d) => { return x(d.date); })
    .y(() => { return y(meanValue2); });
  

  // Scale the range of the data
  x.domain(d3.extent(data, function(d) {
    return d.date;
  }));

  y.domain([d3.min(data, function(d) {
      return d.close - margin.top;
    }),
    d3.max(data, function(d) {
      return d.close + margin.top
    })
  ]);

   // Add the X Axis
  svg.append("g")
    .attr("transform", "translate(0," + height + ")")
    .attr('class', 'x axis')
    .call(xAxis);

  // Add the Y Axis
  svg.append("g")
    .attr("class", "y axis")
    .call(yAxis);

  
  // Add the valueline path.
  svg.append("path")
    .data([data])
    .attr("class", "line")
    .attr("d", valueline);

  svg.append("path")
    .data([data])
    .attr("class", "meanline")
    .attr("d", meanLine);
  
  // Add the valueline path.
  svg.append("path")
    .data([data2])
    .attr("class", "line2")
    .attr("d", valueline);

  svg.append("path")
    .data([data2])
    .attr("class", "meanline2")
    .attr("d", meanLine2);
 
}

//drawGraph
drawGraph(openCloseData, openCloseData2);
!
999px

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