d3-multiple-brushes/index.html at master · imintel/d3-multiple-brushes · GitHub

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
        "http://www.w3.org/TR/html4/strict.dtd">
<style>
svg {
  font: 10px sans-serif;
}

path {
  fill: blue;
}

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

.brush .extent {
  stroke: #fff;
  fill-opacity: .125;
  shape-rendering: crispEdges;
}
</style>
<body>

<script src="http://d3js.org/d3.v3.min.js"></script>
<script src='http://code.jquery.com/jquery-latest.min.js' type='text/javascript'></script>

<script>

 var margin = {
      top: 10,
      right: 10,
      bottom: 100,
      left: 40
    },
    margin2 = {
      top: 50,
      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 brushLoc = [0, 0];
    var newLoc = [0, 0];
    var count = 0;
    var brushes = [];

    var parseDate = d3.time.format("%b %Y").parse;

    var x = d3.time.scale().range([0, width]),
      x2 = d3.time.scale().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");

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

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

    d3.csv("sp500.csv", function(error, data) {

      data.forEach(function(d) {
        d.date = parseDate(d.date);
        d.price = +d.price;
      });

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

      context.append("path")
        .datum(data)
        .attr("d", area2);

      context.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height2 + ")")
        .call(xAxis2);

      brush = newBrush();

      $(".xplane").click(click);

    });

    function click(e) {

      var newLoc = getMousePos(e, $(".xplane"));

      if (window.event.metaKey) {
        if (newLoc < brushLoc[0] || newLoc > brushLoc[1]) {
          setPtr("none");
          brush = newBrush();
        } else {
          setPtr("all");
        }
      } else {
        setPtr("all");
      }
    }

    function setPtr(ev) {
      $('#brush' + count).css("pointer-events", ev);
    }

    function newBrush() {
      count++;

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

      context.append("g")
        .attr("class", "x brush")
        .call(brush)
        .selectAll("rect")
        .attr("y", -6)
        .attr("id", "brush")
        .attr("height", height2 + 7);

      brushes.push(brush);

      return brush;
    }

    function brushend() {
      brushLoc = getBrushLoc(this);
      setPtr("none");
      printData();
    }

    function printData() {
      var view = $('.extentView');
      view.empty();
      var count = 1;
      brushes.forEach(function(br){
        view.append('<p>Brush '+count+': '+br.extent()[0]+' to '+br.extent()[1]+'</p>');
        count++;
      });
    }

    function getBrushLoc(br) {
      var brusha = $(br);
      var x = parseInt(brusha.find('.extent').attr('x'), 10);
      var x1 = x + parseInt(brusha.find('.extent').attr('width'), 10);
      return [x, x1];
    }

    function getMousePos(event, element) {
      var offset = element.offset();
      var x = event.pageX - offset.left;
      return x;
    }

</script>
<div class="extentView">
</body>