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Edit File: pie_basic.js

/* ------------------------------------------------------------------------------
 *
 *  # 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 pie_colors = d3.scale.category20(),
                pie_text_color = '#fff';

// 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)
                    .attr("class", "d3-slice-border")
                    .style("fill", function(d) { return pie_colors(d.data.age); });

// Add text labels
                g.append("text")
                    .attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; })
                    .attr("dy", ".35em")
                    .style("fill", pie_text_color)
                    .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();
});