box.js

(function() {

// Inspired by http://informationandvisualization.de/blog/box-plot
d3.box = function() {
  var width = 1,
      height = 1,
      duration = 0,
      domain = null,
      value = Number,
      whiskers = boxWhiskers,
      quartiles = boxQuartiles,
	  showLabels = true, // whether or not to show text labels
	  numBars = 4,
	  curBar = 1,
      tickFormat = null;

  // For each small multiple…
  function box(g) {
    g.each(function(data, i) {
      //d = d.map(value).sort(d3.ascending);
	  //var boxIndex = data[0];
	  //var boxIndex = 1;
	  var d = data[1].sort(d3.ascending);
	  
	 // console.log(boxIndex); 
	  //console.log(d); 
	  
      var g = d3.select(this),
          n = d.length,
          min = d[0],
          max = d[n - 1];

      // Compute quartiles. Must return exactly 3 elements.
      var quartileData = d.quartiles = quartiles(d);

      // Compute whiskers. Must return exactly 2 elements, or null.
      var whiskerIndices = whiskers && whiskers.call(this, d, i),
          whiskerData = whiskerIndices && whiskerIndices.map(i => d[i]);

      // Compute outliers. If no whiskers are specified, all data are "outliers".
      // We compute the outliers as indices, so that we can join across transitions!
      var outlierIndices = whiskerIndices
          ? d3.range(0, whiskerIndices[0]).concat(d3.range(whiskerIndices[1] + 1, n))
          : d3.range(n);

      // Compute the new x-scale.
      var x1 = d3.scale.linear()
          .domain(domain && domain.call(this, d, i) || [min, max])
          .range([height, 0]);

      // Retrieve the old x-scale, if this is an update.
      var x0 = this.__chart__ || d3.scale.linear()
          .domain([0, Infinity])
		 // .domain([0, max])
          .range(x1.range());

      // Stash the new scale.
      this.__chart__ = x1;

      // Note: the box, median, and box tick elements are fixed in number,
      // so we only have to handle enter and update. In contrast, the outliers
      // and other elements are variable, so we need to exit them! Variable
      // elements also fade in and out.

      // Update center line: the vertical line spanning the whiskers.
      var center = g.selectAll("line.center")
          .data(whiskerData ? [whiskerData] : []);

	 //vertical line
      center.enter().insert("line", "rect")
          .attr("class", "center")
          .attr("x1", width / 2)
          .attr("y1", d => x0(d[0]))
          .attr("x2", width / 2)
          .attr("y2", d => x0(d[1]))
          .style("opacity", 1e-6)
        .transition()
          .duration(duration)
          .style("opacity", 1)
          .attr("y1", d => x1(d[0]))
          .attr("y2", d => x1(d[1]));

      center.transition()
          .duration(duration)
          .style("opacity", 1)
          .attr("y1", d => x1(d[0]))
          .attr("y2", d => x1(d[1]));

      center.exit().transition()
          .duration(duration)
          .style("opacity", 1e-6)
          .attr("y1", d => x1(d[0]))
          .attr("y2", d => x1(d[1]))
          .remove();

      // Update innerquartile box.
      var box = g.selectAll("rect.box")
          .data([quartileData]);

      box.enter().append("rect")
          .attr("class", "box")
          .attr("x", 0)
          .attr("y", d => x0(d[2]))
          .attr("width", width)
          .attr("height", d => x0(d[0]) - x0(d[2]))
        .transition()
          .duration(duration)
          .attr("y", d => x1(d[2]))
          .attr("height", d => x1(d[0]) - x1(d[2]));

      box.transition()
          .duration(duration)
          .attr("y", d => x1(d[2]))
          .attr("height", d => x1(d[0]) - x1(d[2]));

      // Update whiskers.
      var whisker = g.selectAll("line.whisker")
          .data(whiskerData || []);

      whisker.enter().insert("line", "circle, text")
          .attr("class", "whisker")
          .attr("x1", 0)
          .attr("y1", x0)
          .attr("x2", width)
          .attr("y2", x0)
          .style("opacity", 1e-6)
        .transition()
          .duration(duration)
          .attr("y1", x1)
          .attr("y2", x1)
          .style("opacity", 1);

      whisker.transition()
          .duration(duration)
          .attr("y1", x1)
          .attr("y2", x1)
          .style("opacity", 1);

      whisker.exit().transition()
          .duration(duration)
          .attr("y1", x1)
          .attr("y2", x1)
          .style("opacity", 1e-6)
          .remove();

      // Update outliers.
      var outlier = g.selectAll("circle.outlier")
          .data(outlierIndices, Number);

      outlier.enter().insert("circle", "text")
          .attr("class", "outlier")
          .attr("r", 3)
          .attr("cx", width / 2)
          .attr("cy", i => x0(d[i]))
          .style("opacity", 1e-6)
        .transition()
          .duration(duration)
          .attr("cy", i => x1(d[i]))
          .style("opacity", 1);

      outlier.transition()
          .duration(duration)
          .attr("cy", i => x1(d[i]))
          .style("opacity", 1);

      outlier.exit().transition()
          .duration(duration)
          .attr("cy", i => x1(d[i]))
          .style("opacity", 1e-6)
          .remove();

      var aboveOutliers = outlierIndices.filter(i => data[1][i] > domain()[1]);
      var numAboveOutliers = aboveOutliers.length;
      if(aboveOutliers.length > 0) {
        var aboveOutlier = g.selectAll("text.aboveOutlier")
            .data([numAboveOutliers])
            .enter()
            .append("text");

        //Add SVG Text Element Attributes
        var textLabels = aboveOutlier
            .attr("x", d => width / 2)
            .attr("y", d => x1(domain()[1]))
            .html(d => '⬆ ' + d)
            .attr("text-anchor", (d, i) => "middle")
      }

      // Update median line.
      var medianLine = g.selectAll("line.median")
          .data([quartileData[1]]);

      medianLine.enter().append("line")
          .attr("class", "median")
          .attr("x1", 0)
          .attr("y1", x0)
          .attr("x2", width)
          .attr("y2", x0)
          .transition()
          .duration(duration)
          .attr("y1", x1)
          .attr("y2", x1);

      medianLine.transition()
          .duration(duration)
          .attr("y1", x1)
          .attr("y2", x1);

      // Compute the tick format.
      var format = tickFormat || x1.tickFormat(8);

      // Update box ticks.
      var boxTick = g.selectAll("text.box")
          .data(quartileData);
	 if(showLabels == true) {
      boxTick.enter().append("text")
          .attr("class", "box")
          .attr("dy", ".3em")
          .attr("dx", (d, i) => i & 1 ? 6 : -6)
          .attr("x", (d, i) => i & 1 ? +width : 0)
          .attr("y", x0)
          .attr("text-anchor", (d, i) => i & 1 ? "start" : "end")
          .text(format)
        .transition()
          .duration(duration)
          .attr("y", x1);
	}
		 
      boxTick.transition()
          .duration(duration)
          .text(format)
          .attr("y", x1);

      // Update whisker ticks. These are handled separately from the box
      // ticks because they may or may not exist, and we want don't want
      // to join box ticks pre-transition with whisker ticks post-.
      var whiskerTick = g.selectAll("text.whisker")
          .data(whiskerData || []);
	if(showLabels == true) {
      whiskerTick.enter().append("text")
          .attr("class", "whisker")
          .attr("dy", ".3em")
          .attr("dx", 6)
          .attr("x", width)
          .attr("y", x0)
          .text(format)
          .style("opacity", 1e-6)
        .transition()
          .duration(duration)
          .attr("y", x1)
          .style("opacity", 1);
	}
      whiskerTick.transition()
          .duration(duration)
          .text(format)
          .attr("y", x1)
          .style("opacity", 1);

      whiskerTick.exit().transition()
          .duration(duration)
          .attr("y", x1)
          .style("opacity", 1e-6)
          .remove();
    });
    d3.timer.flush();
  }

  box.width = function(x) {
    if (!arguments.length) return width;
    width = x;
    return box;
  };

  box.height = function(x) {
    if (!arguments.length) return height;
    height = x;
    return box;
  };

  box.tickFormat = function(x) {
    if (!arguments.length) return tickFormat;
    tickFormat = x;
    return box;
  };

  box.duration = function(x) {
    if (!arguments.length) return duration;
    duration = x;
    return box;
  };

  box.domain = function(x) {
    if (!arguments.length) return domain;
    domain = x == null ? x : d3.functor(x);
    return box;
  };

  box.value = function(x) {
    if (!arguments.length) return value;
    value = x;
    return box;
  };

  box.whiskers = function(x) {
    if (!arguments.length) return whiskers;
    whiskers = x;
    return box;
  };
  
  box.showLabels = function(x) {
    if (!arguments.length) return showLabels;
    showLabels = x;
    return box;
  };

  box.quartiles = function(x) {
    if (!arguments.length) return quartiles;
    quartiles = x;
    return box;
  };

  return box;
};

function boxWhiskers(d) {
  return [0, d.length - 1];
}

function boxQuartiles(d) {
  return [
    d3.quantile(d, .25),
    d3.quantile(d, .5),
    d3.quantile(d, .75)
  ];
}

})();