A reusable d3 line chart inspired by Reuseable Charts article. Function line() is used to create a new chart instance. Graphs are rendered using randomly-generated data which will be updated repeatedly.
This example can be view on bl.ocks.org.
Last active
August 29, 2015 13:56
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A reusable d3 line chart
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| /* | |
| * Define line graph | |
| */ | |
| function line(){ | |
| // Default settings | |
| var $el = d3.select("body") | |
| var width = 960; | |
| var height = 500; | |
| var color = "steelblue"; | |
| var margin = {top: 10, right: 30, bottom: 30, left: 30}; | |
| var data = []; | |
| var svg, y, xAxis, yAxis, line; | |
| var x = d3.scale.linear().range([0, width]); | |
| var object = {}; | |
| // Method for render/refresh graph | |
| object.render = function(){ | |
| if(!svg){ // Render first time | |
| y = d3.scale.linear() | |
| .range([height, 0]); | |
| xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom"); | |
| yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left"); | |
| line = d3.svg.line() | |
| .x(function(d) { return x(d.x); }) | |
| .y(function(d) { return y(d.y); }) | |
| .interpolate("basis"); | |
| svg = $el.append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| x.domain(d3.extent(data, function(d) { return d.x; })); | |
| y.domain(d3.extent(data, function(d) { return d.y; })); | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis); | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis) | |
| svg.append("path") | |
| .datum(data) | |
| .attr("class", "line") | |
| .attr("stroke", color) | |
| .attr("d", line); | |
| }else{ //Refresh | |
| object.data(data); | |
| x.domain(d3.extent(data, function(d) { return d.x; })); | |
| y.domain(d3.extent(data, function(d) { return d.y; })); | |
| svg.select("g.y") | |
| .transition() | |
| .duration(1000) | |
| .call(yAxis); | |
| svg.select("g.x") | |
| .transition() | |
| .duration(1000) | |
| .call(xAxis); | |
| svg.selectAll("path.line") | |
| .datum(data) | |
| .transition() | |
| .duration(1000) | |
| .attr("d", line); | |
| } | |
| return object; | |
| }; | |
| // Getter and setter methods | |
| object.data = function(value){ | |
| if (!arguments.length) return data; | |
| data = value; | |
| return object; | |
| }; | |
| object.$el = function(value){ | |
| if (!arguments.length) return $el; | |
| $el = value; | |
| return object; | |
| }; | |
| object.width = function(value){ | |
| if (!arguments.length) return width; | |
| width = value; | |
| return object; | |
| }; | |
| object.height = function(value){ | |
| if (!arguments.length) return height; | |
| height = value; | |
| return object; | |
| }; | |
| object.color = function(value){ | |
| if (!arguments.length) return color; | |
| color = value; | |
| return object; | |
| }; | |
| object.x = function(value){ | |
| if (!arguments.length) return x; | |
| x = value; | |
| return object; | |
| } | |
| return object; | |
| }; |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .x.axis path { | |
| display: none; | |
| } | |
| .line { | |
| fill: none; | |
| stroke-width: 1.5px; | |
| } | |
| .tooltip .circle{ | |
| fill: none; | |
| } | |
| </style> | |
| <body> | |
| <div id="line-1"></div> | |
| <div id="line-2"></div> | |
| <div id="line-3"></div> | |
| <div id="line-4"></div> | |
| <script src="http://d3js.org/d3.v3.js"></script> | |
| <script src="d3.line.js"></script> | |
| <script> | |
| // Method used for generate random data. | |
| var getData = function(){ | |
| var data = []; | |
| for(var i=0; i<100; i++){ | |
| data.push({ | |
| x: i, | |
| y: Math.round(Math.random() * 100) | |
| }); | |
| }; | |
| return data; | |
| }; | |
| /* | |
| * Create graphs | |
| */ | |
| var line1 = line() | |
| .$el(d3.select("#line-1")) | |
| .height(100) // Set height | |
| .data(getData()) // Set data | |
| .render(); | |
| var line2 = line() | |
| .$el(d3.select("#line-2")) | |
| .height(100) // Set height | |
| .color("green") // Set color | |
| .data(getData()) // Set data | |
| .render(); | |
| var line3 = line() | |
| .$el(d3.select("#line-3")) | |
| .height(100) // Set height | |
| .color("red") // Set color | |
| .data(getData()) // Set data | |
| .render(); | |
| var line4 = line() | |
| .$el(d3.select("#line-4")) | |
| .height(100) // Set height | |
| .color("gray") // Set color | |
| .data(getData()) // Set data | |
| .render(); | |
| /* | |
| * Refresh graphs repeatedly | |
| */ | |
| setInterval(function(){ | |
| line1.data(getData()).render(); | |
| line2.data(getData()).render(); | |
| line3.data(getData()).render(); | |
| line4.data(getData()).render(); | |
| }, 3000); | |
| </script> | |
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