area chart two

forked from areologist's block: area chart

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <div id ="chartID"></div>
	<script>
    const margin = {top: 70, right: 70, bottom: 70, left: 70};
    const fullWidth = 960;
    const fullHeight = 400;
    const width = fullWidth - margin.left - margin.right;
    const height = fullHeight - margin.top - margin.bottom;

const svg = d3.select('#chartID').append('svg')
      .attr('width', fullWidth)
      .attr('height', fullHeight)

const g = svg
      .append('g')
      .attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');

const parseTime = d3.timeParse('%d-%b-%y');

const area = d3.area()
      .x(d => xScale(d.date))
      .y1(d => yScale(d.committed));

const area2 = d3.area()
      .x(d => xScale(d.date))
      .y1(d => yScale(d.unconfirmed));

const allData = generateData(20);
    const today = new Date(2017, 7, 23);

// select 7-week interval containing 'today'
    // TODO: should be 7 Sun-Sat spans
    // get prev Sunday from today and count back 0-3 weeks
    // depending on depth of available data
    // then count forward to being total to 7 weeks
    const maxDay = new Date(2017, 8, 12);
    const minDay = new Date(2017, 6, 25);
    const data = allData.filter(d =>
      d.date >= minDay && d.date <= maxDay);

const xScale = d3.scaleTime()
    	.domain(d3.extent(data, d => d.date))
      .range([0, width]);

const yMin = d3.min(data, d => d.committed) * 0.75;
    const yMax = d3.max(data,
			d => Math.max(d.committed, d.unconfirmed))

const yScale = d3.scaleLinear()
    	.domain([yMin, yMax])
      .range([height, 0]);

area.y0(yScale(yMin));
    area2.y0(yScale(yMin));

g.append('path')
      .datum(data)
      .attr('fill', '#d189bf')
      .attr('opacity', 0.5)
      .attr('d', area2);

g.append('path')
      .datum(data)
      .attr('fill', '#d189bf')
      .attr('d', area);

const yAxis = d3
      .axisBottom(xScale)
      .ticks(7);

g.append('g')
      .attr('transform', 'translate(0,' + height + ')')
      .call(yAxis);

// util
    function generateData(weeks) {
      const days = (weeks || 6) * 7;
      const min = 12000;
      const max = 85000;
      const result = [];
      // seed values with random value within range
      let committed = Math.random() * (max - min) + min;
      let unconfirmed = Math.random() * (max - min) + min;

for (let i = 0; i < days; i++) {
        const date = new Date(2017, 5, 11);
        const seed = Math.random() * 3000 + 1000;
        date.setDate(date.getDate() + i);
        committed = Math.random() * (committed + seed - min) + min;
				unconfirmed = Math.random() * (unconfirmed + seed - min) + min;
        result.push({
          date,
          committed,
          unconfirmed
        });
      }
      return result;
    }
  </script>
</body>

https://d3js.org/d3.v4.min.js