Stacked Bar Chart Labels - D3

Question

I'm trying to add data labels to stacked bar chart in d3.

I wanted the data labels to be in the middle of the bar. So far i just figured out how to add data labels on top of each bar. But actually i wanted those labels to be in the middle of each bar.

Here's my code :

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)
            .orienta("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")

})

Data :

state,value1, value2, value3
state1, 80, 10, 20
state2, 90, 5, 10
state3, 70, 15, 35
state4, 90, 3, 27
state5, 50, 25, 55
state6, 85, 8, 27

I actually couldn't figure out how to get the mid point of X & Y co-ordinates of each bar.

Help me in arranging the labels in the middle of each bar.

Answer 1

You just need to adjust the y coordinate of the text elements:

circle.selectAll("text")
      .data(function(d) { return d.hours; })
      .enter()
      .append("text")
      .attr("x", 75)
      .attr("y", function(d, i) { return y(d.y1) + (y(d.y0) - y(d.y1))/2; })
      .style("text-anchor", "middle")
      .text("test")