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+/* ------------------------------------------------------------------------------
+ *
+ *  # D3.js - sunbirst diagram with zoom
+ *
+ *  Demo sunbirst diagram setup with interactive zoom
+ *
+ *  Version: 1.0
+ *  Latest update: August 1, 2015
+ *
+ * ---------------------------------------------------------------------------- */
+
+$(function () {
+
+    // Initialize chart
+    sunburstZoomable('#d3-sunburst-zoom', 400, 400);
+
+    // Chart setup
+    function sunburstZoomable(element, width, height) {
+
+
+        // Basic setup
+        // ------------------------------
+
+        // Define main variables
+        var radius = Math.min(width, height) / 2;
+
+
+
+        // Construct scales
+        // ------------------------------
+
+        // Horizontal
+        var x = d3.scale.linear()
+            .range([0, 2 * Math.PI]);
+
+        // Vertical
+        var y = d3.scale.sqrt()
+            .range([0, radius]);
+
+        // Colors
+        var color = d3.scale.category20c();
+
+
+
+        // Create chart
+        // ------------------------------
+
+        var svg = d3.select(element).append("svg")
+            .attr("width", width)
+            .attr("height", height)
+            .append("g")
+                .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
+
+
+
+        // Construct chart layout
+        // ------------------------------
+
+        // Partition layout
+        var partition = d3.layout.partition()
+            .value(function(d) { return d.size; });
+
+        // Arc
+        var arc = d3.svg.arc()
+            .startAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x))); })
+            .endAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x + d.dx))); })
+            .innerRadius(function(d) { return Math.max(0, y(d.y)); })
+            .outerRadius(function(d) { return Math.max(0, y(d.y + d.dy)); });
+
+
+
+        // Load data
+        // ------------------------------
+
+        d3.json("assets/demo_data/d3/sunburst/sunburst_basic.json", function(error, root) {
+
+            // Append sunbirst
+            var path = svg.selectAll(".d3-sunbirst")
+                .data(partition.nodes(root))
+                .enter()
+                .append("path")
+                    .attr("class", "d3-sunbirst")
+                    .attr("d", arc)
+                    .style("fill", function(d) { return color((d.children ? d : d.parent).name); })
+                    .on("click", click);
+
+            // Run transition on click
+            function click(d) {
+                path.transition()
+                    .duration(750)
+                    .attrTween("d", arcTween(d));
+            }
+        });
+
+
+        // Interpolate the scales
+        function arcTween(d) {
+            var xd = d3.interpolate(x.domain(), [d.x, d.x + d.dx]),
+            yd = d3.interpolate(y.domain(), [d.y, 1]),
+            yr = d3.interpolate(y.range(), [d.y ? 20 : 0, radius]);
+            return function(d, i) {
+                return i
+                ? function(t) { return arc(d); }
+                : function(t) { x.domain(xd(t)); y.domain(yd(t)).range(yr(t)); return arc(d); };
+            };
+        }
+    }
+});