/* ------------------------------------------------------------------------------
*
* # D3.js - donut chart update animation
*
* Demo d3.js donut chart setup with .tsv data source and update animation
*
* Version: 1.0
* Latest update: August 1, 2015
*
* ---------------------------------------------------------------------------- */
$(function () {
// Create Uniform checkbox
$(".donut-radios input").uniform({
radioClass: 'choice'
});
// Initialize chart
pieUpdateAnimation('#d3-donut-update', 120);
// Chart setup
function pieUpdateAnimation(element, radius) {
// Basic setup
// ------------------------------
// Colors
var color = d3.scale.category20();
// Create chart
// ------------------------------
// Add SVG element
var container = d3.select(element).append("svg");
// Add SVG group
var svg = container
.attr("width", radius * 2)
.attr("height", radius * 2)
.append("g")
.attr("transform", "translate(" + radius + "," + radius + ")");
// Construct chart layout
// ------------------------------
// Arc
var arc = d3.svg.arc()
.outerRadius(radius)
.innerRadius(radius / 1.75);
// Pie
var pie = d3.layout.pie()
.value(function(d) { return d.lemons; })
.sort(null);
// Load data
// ------------------------------
d3.tsv("assets/demo_data/d3/pies/donuts_update.tsv", function(error, data) {
// Pull out values
data.forEach(function(d) {
d.lemons = +d.lemons || 0;
d.melons = +d.melons || 0;
});
//
// Append chart elements
//
// Bind data
var path = svg.datum(data).selectAll("path")
.data(pie)
.enter()
.append("path")
.attr("fill", function(d, i) { return color(i); })
.attr("d", arc)
.style("stroke", "#fff")
.each(function(d) { this._current = d; }); // store the initial angles
// Apply change event
d3.selectAll(".donut-radios input").on("change", change);
// Change values on page load
var timeout = setTimeout(function() {
d3.select("input[value=\"melons\"]").property("checked", true).each(change);
$.uniform.update();
}, 2000);
// Change values
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
}
});
// 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));
};
}
}
});