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+/* ------------------------------------------------------------------------------
+ *
+ *  # D3.js - sunbirst diagram with distortion
+ *
+ *  Demo sunbirst diagram setup with interactive distortion
+ *
+ *  Version: 1.0
+ *  Latest update: August 1, 2015
+ *
+ * ---------------------------------------------------------------------------- */
+
+$(function () {
+
+    // Initialize chart
+    sunburstDistortion('#d3-sunburst-distortion', 400, 400);
+
+    // Chart setup
+    function sunburstDistortion(element, width, height) {
+
+
+        // Basic setup
+        // ------------------------------
+
+        // Define main variables
+        var radius = Math.min(width, height) / 2;
+            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()
+            .size([2 * Math.PI, radius])
+            .value(function(d) { return d.size; });
+
+        // Arc
+        var arc = d3.svg.arc()
+            .startAngle(function(d) { return d.x; })
+            .endAngle(function(d) { return d.x + d.dx; })
+            .innerRadius(function(d) { return d.y; })
+            .outerRadius(function(d) { return d.y + d.dy; });
+
+
+
+        // Load data
+        // ------------------------------
+
+        d3.json("assets/demo_data/d3/sunburst/sunburst_basic.json", function(root) {
+
+            // Add sunbirst
+            path = svg.data([root]).selectAll("path")
+                .data(partition.nodes)
+                .enter()
+                .append("path")
+                    .attr("d", arc)
+                    .style("stroke", "#fff")
+                    .style("fill", function(d) { return color((d.children ? d : d.parent).name); })
+                    .on("click", magnify)
+                    .each(stash);
+        });
+
+
+        // Distort the specified node to 80% of its parent.
+        function magnify(node) {
+            if (parent = node.parent) {
+                var parent,
+                    x = parent.x,
+                    k = .8;
+
+                parent.children.forEach(function(sibling) {
+                    x += reposition(sibling, x, sibling === node
+                    ? parent.dx * k / node.value
+                    : parent.dx * (1 - k) / (parent.value - node.value));
+                });
+            }
+            else {
+                reposition(node, 0, node.dx / node.value);
+            }
+
+            path.transition()
+                .duration(750)
+                .attrTween("d", arcTween);
+        }
+
+        // Recursively reposition the node at position x with scale k.
+        function reposition(node, x, k) {
+            node.x = x;
+            if (node.children && (n = node.children.length)) {
+                var i = -1, n;
+                while (++i < n) x += reposition(node.children[i], x, k);
+            }
+            return node.dx = node.value * k;
+        }
+
+        // Stash the old values for transition.
+        function stash(d) {
+            d.x0 = d.x;
+            d.dx0 = d.dx;
+        }
+
+        // Interpolate the arcs in data space.
+        function arcTween(a) {
+            var i = d3.interpolate({x: a.x0, dx: a.dx0}, a);
+            return function(t) {
+                var b = i(t);
+                a.x0 = b.x;
+                a.dx0 = b.dx;
+                return arc(b);
+            };
+        }
+    }
+});