/* ------------------------------------------------------------------------------ * * # D3.js - basic line chart * * Demo d3.js line chart setup with tooltip and .tsv data source * * Version: 1.0 * Latest update: August 1, 2015 * * ---------------------------------------------------------------------------- */ $(function () { // Initialize chart lineBasic('#d3-line-basic', 400); // Chart setup function lineBasic(element, height) { // Basic setup // ------------------------------ // Define main variables var d3Container = d3.select(element), margin = {top: 5, right: 20, bottom: 20, left: 40}, width = d3Container.node().getBoundingClientRect().width - margin.left - margin.right, height = height - margin.top - margin.bottom - 5; // Format data var parseDate = d3.time.format("%d-%b-%y").parse, bisectDate = d3.bisector(function(d) { return d.date; }).left, formatValue = d3.format(",.2f"), formatCurrency = function(d) { return "$" + formatValue(d); } // Construct scales // ------------------------------ // Horizontal var x = d3.time.scale() .range([0, width]); // Vertical var y = d3.scale.linear() .range([height, 0]); // Create axes // ------------------------------ // Horizontal var xAxis = d3.svg.axis() .scale(x) .orient("bottom") .ticks(6) .tickFormat(d3.time.format("%b")); // Vertical var yAxis = d3.svg.axis() .scale(y) .orient("left"); // Create chart // ------------------------------ // Add SVG element var container = d3Container.append("svg"); // Add SVG group var svg = container .attr("width", width + margin.left + margin.right) .attr("height", height + margin.top + margin.bottom) .append("g") .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); // Construct chart layout // ------------------------------ // Line var line = d3.svg.line() .interpolate("basis") .x(function(d) { return x(d.date); }) .y(function(d) { return y(d.close); }); // Load data // ------------------------------ d3.tsv("assets/demo_data/d3/lines/lines_basic.tsv", function(error, data) { // Pull out values data.forEach(function(d) { d.date = parseDate(d.date); d.close = +d.close; }); // Sort data data.sort(function(a, b) { return a.date - b.date; }); // Set input domains // ------------------------------ // Horizontal x.domain(d3.extent(data, function(d) { return d.date; })); // Vertical y.domain([0, d3.max(data, function(d) { return d.close; })]); // // Append chart elements // // Add line svg.append("path") .datum(data) .attr("class", "d3-line d3-line-medium") .attr("d", line) .style("fill", "none") .style("stroke-width", 2) .style("stroke", "#4CAF50"); // Append axes // ------------------------------ // Horizontal svg.append("g") .attr("class", "d3-axis d3-axis-horizontal d3-axis-strong") .attr("transform", "translate(0," + height + ")") .call(xAxis); // Vertical var verticalAxis = svg.append("g") .attr("class", "d3-axis d3-axis-vertical d3-axis-strong") .call(yAxis); // Add text label verticalAxis.append("text") .attr("transform", "rotate(-90)") .attr("y", 10) .attr("dy", ".71em") .style("text-anchor", "end") .style("fill", "#999") .style("font-size", 12) .text("Price ($)"); // Append tooltip // ------------------------- // Group elements var focus = svg.append("g") .attr("class", "d3-crosshair-pointer") .style("display", "none"); // Pointer focus.append("circle") .attr("r", 3.5) .style("fill", "#fff") .style("stroke", "#4CAF50") .style("stroke-width", 2); // Text focus.append("text") .attr("dy", ".35em") .style("fill", "#333") .style("stroke", "none") // Overlay svg.append("rect") .attr("class", "d3-crosshair-overlay") .attr("width", width) .attr("height", height) .on("mouseover", function() { focus.style("display", null); }) .on("mouseout", function() { focus.style("display", "none"); }) .on("mousemove", mousemove); // Display tooltip on mousemove function mousemove() { var x0 = x.invert(d3.mouse(this)[0]), i = bisectDate(data, x0, 1), d0 = data[i - 1], d1 = data[i], d = x0 - d0.date > d1.date - x0 ? d1 : d0; focus.attr("transform", "translate(" + x(d.date) + "," + y(d.close) + ")"); focus.select("text").text(formatCurrency(d.close)).attr("dx", -26).attr("dy", 30); } }); // 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); // Crosshair svg.selectAll('.d3-crosshair-overlay').attr("width", width); } } });