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X & Y Coordinates of selected bars in the stack graph

I have a summary bar chart. And I would like to draw a line similar to the grouping of several bars of a folded histogram.

Something like that. enter image description here

Therefore, for this I need to find the coordinate of the ysecond and last stripes.

Someone please help in drawing this line with d3.

JS:

var width = 750,
      height = 500;

  var x = d3.scale.ordinal ()
            .rangeRoundBands ([0, width], .1);

  var y = d3.scale.linear ()
            .rangeRound ([height, 0]);

  var color = d3.scale.ordinal ()
                .range (["# D70B16", "# 154CEF", "# 1A8A55"]);

  var xAxis = d3.svg.axis ()
                .scale (x)
                .orient ("bottom");

  var yAxis = d3.svg.axis ()
                .scale (y)
                .orient("left")
                .tickFormat(d3.format(".2s"));

  var tip = d3.tip()
            .attr('class', 'd3-tip')
            .offset([-10, 0])
            .html(function(d) {
            return "Value: " + (d.y1 - d.y0) + "";
            })

  var svgContainer = d3.select("body")
                        .append("svg")
                        .attr("width", width)
                        .attr("height", height)
                        .append("g")
                        .attr("transform", "translate(" + 30 + "," + 30 + ")");


  d3.csv("data.csv", function(error, data) {
    color.domain(d3.keys(data[0]).filter(function(key) { return key !== "circle"; }));

    data.forEach(function(d) {
      var y0 = 0;
      d.hours = color.domain().map(function(name) { return {name: name, y0: y0, y1: y0 += +d[name]}; });

      d3.select('body').append('pre')
              .text(JSON.stringify(d.hours, null, '  '));


      d.total = d.hours[d.hours.length - 1].y1;
    });

    x.domain(data.map(function(d) {return d.circle;}));
    y.domain([0, d3.max(data, function(d) {return d.total;})])

    svgContainer.append("g")
                .attr("class", "x axis")
                .attr("transform", "translate(0," + height + ")")
                .call(xAxis);

    svgContainer.append("g")
                .attr("class", "y axis")
                .call(yAxis)
                .append("text")
                .attr("transform", "rotate(-90)")
                .attr("y", 6)
                .attr("dy", ".71em")
                .style("text-anchor", "end")
                .text("Login Hours");

    var circle = svgContainer.selectAll(".circle")
                    .data(data)
                    .enter().append("g")
                    .attr("class", "g")
                    .attr("transform", function(d) { return "translate(" + x(d.circle) + ",0)"; });

    circle.selectAll("rect")
          .data(function(d) { return d.hours; })
          .enter()
          .append("rect")
          .attr("width", x.rangeBand())
          .attr("y", function(d) { return y(d.y1); })
          .attr("height", function(d) { return y(d.y0) - y(d.y1); })
          .on("mouseover", tip.show)
          .on("mouseout", tip.hide)
          .style("fill", function(d) { return color(d.name); });


    circle.selectAll("text")
          .data(function(d) { return d.hours; })
          .enter()
          .append("text")
          .attr("x", 75)
          .attr("y", function(d, i) { return y(d.y1) ; })
          .style("text-anchor", "middle")
          .text("test")

  })
0
1

( ), , . rect, , .

, , y , :

var yCoord = y(data[0].hours[1].y1);
+2

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