| license: mit |
This is a follow on from the simple scatterplot used as an example in the book D3 Tips and Tricks.
It is aimed at demonstrating a the use of an if statement to select elements in d3.js. It should be taken in context with the text of the book which can be downloaded for free from Leanpub.
| date | close | |
|---|---|---|
| 1-May-12 | 58.13 | |
| 30-Apr-12 | 53.98 | |
| 27-Apr-12 | 67.00 | |
| 26-Apr-12 | 89.70 | |
| 25-Apr-12 | 99.00 | |
| 24-Apr-12 | 130.28 | |
| 23-Apr-12 | 166.70 | |
| 20-Apr-12 | 234.98 | |
| 19-Apr-12 | 345.44 | |
| 18-Apr-12 | 443.34 | |
| 17-Apr-12 | 543.70 | |
| 16-Apr-12 | 580.13 | |
| 13-Apr-12 | 605.23 | |
| 12-Apr-12 | 622.77 | |
| 11-Apr-12 | 626.20 | |
| 10-Apr-12 | 628.44 | |
| 9-Apr-12 | 636.23 | |
| 5-Apr-12 | 633.68 | |
| 4-Apr-12 | 624.31 | |
| 3-Apr-12 | 629.32 | |
| 2-Apr-12 | 618.63 | |
| 30-Mar-12 | 599.55 | |
| 29-Mar-12 | 609.86 | |
| 28-Mar-12 | 617.62 | |
| 27-Mar-12 | 614.48 | |
| 26-Mar-12 | 606.98 |
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> /* set the CSS */ | |
| body { font: 12px Arial;} | |
| path { | |
| stroke: steelblue; | |
| stroke-width: 2; | |
| fill: none; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: grey; | |
| stroke-width: 1; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| <body> | |
| <!-- load the d3.js library --> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script> | |
| <script> | |
| // Set the dimensions of the canvas / graph | |
| var margin = {top: 30, right: 20, bottom: 30, left: 50}, | |
| width = 600 - margin.left - margin.right, | |
| height = 270 - margin.top - margin.bottom; | |
| // Parse the date / time | |
| var parseDate = d3.time.format("%d-%b-%y").parse; | |
| // Set the ranges | |
| var x = d3.time.scale().range([0, width]); | |
| var y = d3.scale.linear().range([height, 0]); | |
| // Define the axes | |
| var xAxis = d3.svg.axis().scale(x) | |
| .orient("bottom").ticks(5); | |
| var yAxis = d3.svg.axis().scale(y) | |
| .orient("left").ticks(5); | |
| // Define the line | |
| var valueline = d3.svg.line() | |
| .x(function(d) { return x(d.date); }) | |
| .y(function(d) { return y(d.close); }); | |
| // Adds the svg canvas | |
| 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 + ")"); | |
| // Get the data | |
| d3.csv("data.csv", function(error, data) { | |
| data.forEach(function(d) { | |
| d.date = parseDate(d.date); | |
| d.close = +d.close; | |
| }); | |
| // Scale the range of the data | |
| x.domain(d3.extent(data, function(d) { return d.date; })); | |
| y.domain([0, d3.max(data, function(d) { return d.close; })]); | |
| // Add the valueline path. | |
| svg.append("path") | |
| .attr("class", "line") | |
| .attr("d", valueline(data)); | |
| // Add the scatterplot | |
| svg.selectAll("dot") | |
| .data(data) | |
| .enter().append("circle") | |
| .attr("r", 3.5) | |
| .style("fill", function(d) { | |
| if (d.close <= 400) {return "red"} | |
| else { return "black" } | |
| ;}) | |
| .attr("cx", function(d) { return x(d.date); }) | |
| .attr("cy", function(d) { return y(d.close); }); | |
| // Add the X Axis | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis); | |
| // Add the Y Axis | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis); | |
| }); | |
| </script> | |
| </body> |
