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+/* ------------------------------------------------------------------------------
+ *
+ *  # D3.js - radial tree layout
+ *
+ *  Demo of radial tree layout setup with .json data source
+ *
+ *  Version: 1.0
+ *  Latest update: August 1, 2015
+ *
+ * ---------------------------------------------------------------------------- */
+
+$(function () {
+
+    // Initialize chart
+    treeRadial('#d3-tree-radial', 900);
+
+    // Chart setup
+    function treeRadial(element, diameter) {
+
+
+        // Basic setup
+        // ------------------------------
+
+        // Define main variables
+        var d3Container = d3.select(element);
+
+
+
+        // Create chart
+        // ------------------------------
+
+        // Add SVG element
+        var container = d3Container.append("svg");
+
+        // Add SVG group
+        var svg = container
+            .attr("width", diameter)
+            .attr("height", diameter - 140)
+            .append("g")
+                .attr("transform", "translate(" + (diameter / 2) + "," + (diameter / 2) + ")");
+
+
+
+        // Construct chart layout
+        // ------------------------------
+
+        // Tree
+        var tree = d3.layout.tree()
+            .size([360, (diameter / 2) - 110])
+            .separation(function(a, b) { return (a.parent == b.parent ? 1 : 2) / a.depth; });
+
+        // Diagonal projection
+        var diagonal = d3.svg.diagonal.radial()
+            .projection(function(d) { return [d.y, d.x / 180 * Math.PI]; });
+
+
+        // Load data
+        // ------------------------------
+
+        d3.json("assets/demo_data/d3/tree/tree_data_radial.json", function(error, root) {
+
+            var nodes = tree.nodes(root),
+                links = tree.links(nodes);
+
+
+            // Links
+            // ------------------------------
+
+            // Append link paths
+            var link = svg.selectAll(".d3-tree-link")
+                .data(links)
+                .enter()
+                .append("path")
+                    .attr("class", "d3-tree-link")
+                    .attr("d", diagonal)
+                    .style("fill", "none")
+                    .style("stroke", "#ddd")
+                    .style("stroke-width", 1.5);
+
+
+            // Nodes
+            // ------------------------------
+
+            // Append node group
+            var node = svg.selectAll(".d3-tree-node")
+                .data(nodes)
+                .enter()
+                .append("g")
+                    .attr("class", "d3-tree-node")
+                    .attr("transform", function(d) { return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")"; })
+
+            // Append circles
+            node.append("circle")
+                .attr("r", 4.5)
+                .style("fill", "#fff")
+                .style("stroke", "#2196F3")
+                .style("stroke-width", 1.5);
+
+            // Append text
+            node.append("text")
+                .attr("dy", ".31em")
+                .attr("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; })
+                .attr("transform", function(d) { return d.x < 180 ? "translate(8)" : "rotate(180)translate(-8)"; })
+                .style("font-size", 12)
+                .text(function(d) { return d.name; });
+        });
+    }
+});