更新带有标签的饼图（d3）

Question

I'm just trying to append the labels of mbostocks pie chart example, but for some reason I can't get it to work.

I'm essentially just trying to combine two of his examples ( pie update , pie labels ), so I'm trying to implement this code;

var g = svg.selectAll(".arc")
      .data(pie(data))
    .enter().append("g")
      .attr("class", "arc");

  g.append("path")
      .attr("d", arc)
      .style("fill", function(d) { return color(d.data.apples); });

  g.append("text")
      .attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; })
      .attr("dy", ".35em")
      .text(function(d) { return d.data.apples; });
});

into this variable in his pie chart update example;

var path = svg.datum(data).selectAll("path")
      .data(pie)
    .enter().append("path")
      .attr("fill", function(d, i) { return color(i); })
      .attr("d", arc)
      .each(function(d) { this._current = d; }); // store the initial angles

here is the plnk of my attempt, hopefully someone can clear up the issue I'm having.

http://plnkr.co/edit/e05kKjB8KWGqRteh8OdS?p=preview

---

Code for my attempt;

var width = 960,
    height = 500,
    radius = Math.min(width, height) / 2;

var color = d3.scale.category20();

var pie = d3.layout.pie()
    .value(function(d) { return d.apples; })
    .sort(null);

var arc = d3.svg.arc()
    .innerRadius(radius - 100)
    .outerRadius(radius - 20);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

d3.tsv("data.tsv", type, function(error, data) {
  if (error) throw error;

/*  var path = svg.datum(data).selectAll("path")
      .data(pie)
    .enter().append("path")
      .attr("fill", function(d, i) { return color(i); })
      .attr("d", arc)
      .each(function(d) { this._current = d; }); // store the initial angles*/


  var g = svg.datum(data).selectAll(".arc")
      .data(pie)
    .enter().append("g")
      .attr("class", "arc")

  g.append("path")
      .attr("d", arc)
      .style("fill", function(d) { return color(d.data.apples); })
            .each(function(d) { this._current = d; }); // store the initial angles


  g.append("text")
      .attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; })
      .attr("dy", ".35em")
      .text(function(d) { return d.data.apples; });

  d3.selectAll("input")
      .on("change", change);

  var timeout = setTimeout(function() {
    d3.select("input[value=\"oranges\"]").property("checked", true).each(change);
  });

  function change() {
    var value = this.value;
    clearTimeout(timeout);
    pie.value(function(d) { return d[value]; }); // change the value function
    path = g.data(pie); // compute the new angles
    path.transition().duration(750).attrTween("d", arcTween); // redraw the arcs
  }
});

function type(d) {
  d.apples = +d.apples;
  d.oranges = +d.oranges;
  return d;
}

// Store the displayed angles in _current.
// Then, interpolate from _current to the new angles.
// During the transition, _current is updated in-place by d3.interpolate.
function arcTween(a) {
  var i = d3.interpolate(this._current, a);
  this._current = i(0);
  return function(t) {
    return arc(i(t));
  };
}

Answer 1

When you moved from a collection of path to a collection of g containing a path and text , you didn't update your transition to operate on the paths. It's attempting to apply the transition on the g . Corrected code:

function change() {
  var value = this.value;
  pie.value(function(d) { return d[value]; }); 
  g = g.data(pie); 
  g.select("path") //<-- operate on the paths in the g
    .transition()
    .duration(750)
    .attrTween("d", arcTween);
}

Running code:

 var width = 500, height = 500, radius = Math.min(width, height) / 2; var color = d3.scale.category20(); var pie = d3.layout.pie() .value(function(d) { return d.apples; }) .sort(null); var arc = d3.svg.arc() .innerRadius(radius - 100) .outerRadius(radius - 20); var svg = d3.select("body").append("svg") .attr("width", width) .attr("height", height) .append("g") .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"); var data = [{ "apples": 53245, "oranges": 200 }, { "apples": 28479, "oranges": 200 }, { "apples": 19697, "oranges": 200 }, { "apples": 24037, "oranges": 200 }, { "apples": 40245, "oranges": 200 }]; var g = svg.datum(data).selectAll(".arc") .data(pie) .enter().append("g") .attr("class", "arc"); var path = g.append("path") .attr("d", arc) .style("fill", function(d) { return color(d.data.apples); }) .each(function(d) { this._current = d; }); // store the initial angles var text = g.append("text") .attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; }) .attr("dy", ".35em") .text(function(d) { return d.data.apples; }); d3.selectAll("input") .on("change", change); function change() { var value = this.value; pie.value(function(d) { return d[value]; }); // change the value function g = g.data(pie); // compute the new angles g.select("path") .transition() .duration(750) .attrTween("d", arcTween); // redraw the arcs g.select("text") .style("opacity", 0) .attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; }) .text(function(d) { return d.data[value]; }) .transition() .duration(1000) .style("opacity", 1); } function type(d) { d.apples = +d.apples; d.oranges = +d.oranges; return d; } // Store the displayed angles in _current. // Then, interpolate from _current to the new angles. // During the transition, _current is updated in-place by d3.interpolate. function arcTween(a) { var i = d3.interpolate(this._current, a); this._current = i(0); return function(t) { return arc(i(t)); }; } 

 <!DOCTYPE html> <html> <head> <script data-require="jquery@*" data-semver="2.2.0" src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script> <script data-require="d3@*" data-semver="3.5.3" src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.3/d3.js"></script> <link rel="stylesheet" href="style.css" /> </head> <body> <form> <label><input type="radio" name="dataset" value="apples" checked> Apples</label> <label><input type="radio" name="dataset" value="oranges"> Oranges</label> </form> <script src="script.js"></script> </body> </html>