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/* ------------------------------------------------------------------------------
*
* # D3.js - basic pie chart
*
* Demo d3.js pie chart setup with .csv data source
*
* ---------------------------------------------------------------------------- */
// Setup module
// ------------------------------
var D3PieBasic = function() {
//
// Setup module components
//
// Chart
var _pieBasic = function() {
if (typeof d3 == 'undefined') {
console.warn('Warning - d3.min.js is not loaded.');
return;
}
// Main variables
var element = document.getElementById('d3-pie-basic'),
radius = 120;
// Initialize chart only if element exsists in the DOM
if(element) {
// 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(0);
// Pie
var pie = d3.layout.pie()
.sort(null)
.value(function(d) { return d.population; });
// Load data
// ------------------------------
d3.csv("../../../../global_assets/demo_data/d3/pies/pies_basic.csv", function(error, data) {
// Pull out values
data.forEach(function(d) {
d.population = +d.population;
});
//
// Append chart elements
//
// Bind data
var g = svg.selectAll(".d3-arc")
.data(pie(data))
.enter()
.append("g")
.attr("class", "d3-arc");
// Add arc path
g.append("path")
.attr("d", arc)
.style("stroke", "#fff")
.style("fill", function(d) { return color(d.data.age); });
// Add text labels
g.append("text")
.attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; })
.attr("dy", ".35em")
.style("fill", "#fff")
.style("font-size", 12)
.style("text-anchor", "middle")
.text(function(d) { return d.data.age; });
});
}
};
//
// Return objects assigned to module
//
return {
init: function() {
_pieBasic();
}
}
}();
// Initialize module
// ------------------------------
document.addEventListener('DOMContentLoaded', function() {
D3PieBasic.init();
});