Demonstration of transforming CSV data using D3
For NICAR Beginning D3, 2017
Charts forked from d3indepth's block: DOM Manipulation
forked from darlacameron's block: 2. Transforming data
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March 2, 2017 02:29
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3. Drawing shapes
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| license: gpl-3.0 | |
| height: 240 | |
| border: no |
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| page | lion | dog | tiger | |
|---|---|---|---|---|
| 1 | 1 | 0 | 0 | |
| 2 | 2 | 2 | 0 | |
| 3 | 3 | 3 | 0 | |
| 4 | 3 | 4 | 0 | |
| 5 | 3 | 4 | 0 | |
| 6 | 3 | 4 | 0 | |
| 7 | 3 | 4 | 5 | |
| 8 | 3 | 4 | 5 | |
| 9 | 3 | 4 | 5 | |
| 10 | 3 | 4 | 7 | |
| 11 | 7 | 7 | 7 | |
| 12 | 7 | 7 | 7 | |
| 13 | 8 | 8 | 9 | |
| 14 | 8 | 8 | 9 | |
| 15 | 9 | 9 | 9 | |
| 16 | 10 | 10 | 10 | |
| 17 | 10 | 10 | 10 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <title>Transforming data</title> | |
| </head> | |
| <style> | |
| body { | |
| font-family: "Helvetica Neue", Helvetica, sans-serif; | |
| font-size: 14px; | |
| } | |
| path { | |
| fill: none; | |
| stroke: #aaa; | |
| } | |
| .line { | |
| stroke-width:2px; | |
| } | |
| .line.lion{ | |
| stroke:red; | |
| } | |
| .line.dog{ | |
| stroke:gold; | |
| } | |
| .line.tiger{ | |
| stroke:orange; | |
| } | |
| </style> | |
| <body> | |
| <svg width="800" height="100"> | |
| <path/> | |
| </svg> | |
| <script src="http://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| //1 DRAW A BASIC LINE | |
| var data = [[0, 50], [100, 80], [200, 40], [300, 60], [400, 30]]; | |
| var lineGenerator = d3.line() | |
| //.curve(d3.curveNatural); | |
| var pathString = lineGenerator(data); | |
| d3.select('path') | |
| .attr('d', pathString); | |
| //2 MAKE A LINE CHART WITH OUR OWN DATA | |
| d3.csv("data.csv", function(error, data) { | |
| if (error) throw error; | |
| //format the data | |
| data.forEach(function(d) { | |
| d.page = +d.page; | |
| d.lion = +d.lion; | |
| d.dog = +d.dog; | |
| d.tiger = +d.tiger; | |
| }); | |
| //lineChart(data,'lion'); | |
| //lineChart(data,'dog'); | |
| //lineChart(data,'tiger'); | |
| }); | |
| var lineChart = function(data, character){ | |
| // set the dimensions and margins of the graph | |
| var margin = {top: 20, right: 20, bottom: 60, left: 50}, | |
| width = 200 - margin.left - margin.right, | |
| height = 200 - margin.top - margin.bottom; | |
| // set the ranges- the space where we will draw | |
| var x = d3.scaleLinear().range([0, width]); | |
| var y = d3.scaleLinear().range([height, 0]); | |
| // define the line | |
| var line = d3.line() | |
| //.curve(d3.curveNatural) | |
| .x(function(d) { return x(d.page); }) | |
| .y(function(d) { return y(d[character]); }); | |
| //add a new svg to hold the chart | |
| var svg = d3.select("body").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 + ")"); | |
| // Scale the domain of the data | |
| x.domain(d3.extent(data, function(d) { return d.page; })); | |
| y.domain([0, d3.max(data, function(d) { return d[character]; })]); | |
| // Add the line path | |
| svg.append("path") | |
| .data([data]) | |
| .attr("class", character+" line") | |
| .attr("d", line); | |
| // Add the X Axis | |
| // svg.append("g") | |
| // .attr("transform", "translate(0," + height + ")") | |
| // .call(d3.axisBottom(x)); | |
| // Add the Y Axis | |
| // svg.append("g") | |
| // .call(d3.axisLeft(y)); | |
| // And add a label | |
| // svg.append("text") | |
| // .attr("transform", "translate(" + (width/2) + " ," + (height + margin.top + 15) + ")") | |
| // .style("text-anchor", "middle") | |
| // .text(character); | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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