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+/* ------------------------------------------------------------------------------
+ *
+ *  # D3.js - area chart with missing data
+ *
+ *  Demo d3.js area chart setup with tooltip and missing data
+ *
+ *  Version: 1.0
+ *  Latest update: August 1, 2015
+ *
+ * ---------------------------------------------------------------------------- */
+
+$(function () {
+
+    // Initialize chart
+    areaMissing('#d3-missing-data', 400);
+
+    // Chart setup
+    function areaMissing(element, height) {
+
+
+        // Basic setup
+        // ------------------------------
+
+        // Define main variables
+        var d3Container = d3.select(element),
+            margin = {top: 5, right: 20, bottom: 20, left: 40},
+            width = d3Container.node().getBoundingClientRect().width - margin.left - margin.right,
+            height = height - margin.top - margin.bottom - 5;
+
+        // Data set
+        var data = d3.range(60).map(function(i) {
+          return {x: i / 59, y: i % 5 ? (Math.sin(i / 3) + 2) / 4 : null};
+        });
+
+
+
+        // Construct scales
+        // ------------------------------
+
+        // Horizontal
+        var x = d3.scale.linear()
+            .range([0, width]);
+
+        // Vertical
+        var y = d3.scale.linear()
+            .range([height, 0]);
+
+
+
+        // Create axes
+        // ------------------------------
+
+        // Horizontal
+        var xAxis = d3.svg.axis()
+            .scale(x)
+            .orient("bottom");
+
+        // Vertical
+        var yAxis = d3.svg.axis()
+            .scale(y)
+            .orient("left");
+
+
+        // Add tooltip
+        var tip = d3.tip()
+            .attr('class', 'd3-tip')
+            .offset([-10, 0])
+            .html(function(d) {
+                return d.x;
+            });
+
+
+
+        // Create chart
+        // ------------------------------
+
+        // Add SVG element
+        var container = d3Container.append("svg");
+
+        // Add SVG group
+        var svg = container
+            .datum(data)
+            .attr("width", width + margin.left + margin.right)
+            .attr("height", height + margin.top + margin.bottom)
+            .append("g")
+                .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
+                .call(tip);
+
+
+
+        // Construct chart layout
+        // ------------------------------
+
+        // Line
+        var line = d3.svg.line()
+            .defined(function(d) { return d.y != null; })
+            .x(function(d) { return x(d.x); })
+            .y(function(d) { return y(d.y); });
+
+        // Area
+        var area = d3.svg.area()
+            .defined(line.defined())
+            .x(line.x())
+            .y1(line.y())
+            .y0(y(0));
+
+
+        //
+        // Append chart elements
+        //
+
+        // Append axes
+        // ------------------------------
+
+        // Horizontal
+        svg.append("g")
+            .attr("class", "d3-axis d3-axis-horizontal d3-axis-strong")
+            .attr("transform", "translate(0," + height + ")")
+            .call(xAxis);
+
+        // Vertical
+        svg.append("g")
+            .attr("class", "d3-axis d3-axis-vertical d3-axis-strong")
+            .call(yAxis);
+
+
+        // Chart elements
+        // ------------------------------
+
+        // Add area
+        svg.append("path")
+            .attr("class", "d3-area")
+            .attr("d", area)
+            .style("fill", "#81C784");
+
+
+        // Add line
+        svg.append("path")
+            .attr("class", "d3-line d3-line-medium")
+            .attr("d", line)
+            .style("stroke", "#43A047");
+
+        // Add dots
+        svg.selectAll(".d3-dot")
+            .data(data.filter(function(d) { return d.y; }))
+            .enter()
+            .append("circle")
+                .attr("class", "d3-dot")
+                .attr("cx", line.x())
+                .attr("cy", line.y())
+                .attr("r", 3)
+                .style("fill", "#fff")
+                .style("stroke", "#43A047")
+                .style("stroke-width", 1.5)
+                .on('mouseover', tip.show)
+                .on('mouseout', tip.hide);
+
+
+
+        // Resize chart
+        // ------------------------------
+
+        // Call function on window resize
+        $(window).on('resize', resize);
+
+        // Call function on sidebar width change
+        $('.sidebar-control').on('click', resize);
+
+        // Resize function
+        // 
+        // Since D3 doesn't support SVG resize by default,
+        // we need to manually specify parts of the graph that need to 
+        // be updated on window resize
+        function resize() {
+
+            // Layout variables
+            width = d3Container.node().getBoundingClientRect().width - margin.left - margin.right;
+
+
+            // Layout
+            // -------------------------
+
+            // Main svg width
+            container.attr("width", width + margin.left + margin.right);
+
+            // Width of appended group
+            svg.attr("width", width + margin.left + margin.right);
+
+
+            // Axes
+            // -------------------------
+
+            // Horizontal range
+            x.range([0, width]);
+
+            // Horizontal axis
+            svg.selectAll('.d3-axis-horizontal').call(xAxis);
+
+
+            // Chart elements
+            // -------------------------
+
+            // Line path
+            svg.selectAll('.d3-line').attr("d", line);
+
+            // Area path
+            svg.selectAll('.d3-area').attr("d", area);
+
+            // Dots
+            svg.selectAll('.d3-dot').attr("cx", line.x());
+        }
+    }
+});