mbostock/.block

## .block
license: gpl-3.0

## README.md

      
    Raw
  

              README.md
            
          
    This variation of a donut chart demonstrates how to update values with an animated transition. Clicking on the radio buttons changes the displayed metric.
Next: Missing Data

Previous: Static Update

  
## data.tsv

          
            apples
            oranges

            
              53245
              200

            
              28479
              200

            
              19697
              200

            
              24037
              200

            
              40245
              200

## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: auto;
  position: relative;
  width: 960px;
}

text {
  font: 10px sans-serif;
}

form {
  position: absolute;
  right: 10px;
  top: 10px;
}

</style>
<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="//d3js.org/d3.v3.min.js"></script>
<script>

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

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

  var timeout = setTimeout(function() {
    d3.select("input[value=\"oranges\"]").property("checked", true).each(change);
  }, 2000);

  function change() {
    var value = this.value;
    clearTimeout(timeout);
    pie.value(function(d) { return d[value]; }); // change the value function
    path = path.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));
  };
}

</script>

## thumbnail.png

      
    Raw
  

              thumbnail.png
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	body {
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	margin: auto;
	position: relative;
	width: 960px;
	}

	text {
	font: 10px sans-serif;
	}

	form {
	position: absolute;
	right: 10px;
	top: 10px;
	}

	</style>
	<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="//d3js.org/d3.v3.min.js"></script>
	<script>

	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

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

	var timeout = setTimeout(function() {
	d3.select("input[value=\"oranges\"]").property("checked", true).each(change);
	}, 2000);

	function change() {
	var value = this.value;
	clearTimeout(timeout);
	pie.value(function(d) { return d[value]; }); // change the value function
	path = path.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));
	};
	}

	</script>