Created
August 14, 2012 21:46
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| <html> | |
| <head> | |
| <title>D3 Demo: Making a bar chart with value labels!</title> | |
| <script type="text/javascript" src="d3.js"></script> | |
| <style type="text/css"> | |
| /* No style rules here yet */ | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| //Width and height | |
| var w = 800; | |
| var h = 500; | |
| var bottomMargin = 22; | |
| var barPadding = 1; | |
| var dataset = [ 5, 10, 13, 19, 21, 25, 22, 18, 15, 13, | |
| 11, 12, 15, 20, 18, 17, 16, 18, 23, 25 ]; | |
| var stdDevs = [ 1, 2, 3, 3, 4, 3, 6, 2, 1.5, 2, | |
| 5, 5.5, 5, 4.5, 4, 3.5, 3, 2.5, 2, 1.5]; | |
| var maxDisplayValue = -1000000; | |
| var minDisplayValue = 1000000; | |
| for(var index = 0; index < dataset.length; index++){ | |
| // At 3.33 standard deviations away from the mean, the probability | |
| // density is less than 1/256 of that at the peak. We can round it | |
| // down to zero as there are 256 shades of web-safe gray. | |
| if(dataset[index] + 3.33*stdDevs[index] > maxDisplayValue){ | |
| maxDisplayValue = dataset[index] + 3.33*stdDevs[index]; | |
| } | |
| if(dataset[index] - 3.33*stdDevs[index] < minDisplayValue){ | |
| minDisplayValue = dataset[index] - 3.33*stdDevs[index]; | |
| } | |
| } | |
| var verticalDataExtent = maxDisplayValue - minDisplayValue; | |
| var maxValue = Math.max.apply(Math, dataset); | |
| //Create SVG element | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", w) | |
| .attr("height", h); | |
| var gradient = svg.append("svg:defs") | |
| .append("svg:linearGradient") | |
| .attr("id", "gradient") | |
| .attr("x1", "0%") | |
| .attr("y1", "0%") | |
| .attr("x2", "0%") | |
| .attr("y2", "100%") | |
| .attr("spreadMethod", "pad"); | |
| gradient.append("svg:stop") | |
| .attr("offset", "0%") | |
| .attr("stop-opacity", 0) | |
| .attr("stop-color", "#049"); | |
| gradient.append("svg:stop") | |
| .attr("offset", "25%") | |
| .attr("stop-opacity", .25) | |
| .attr("stop-color", "#049"); | |
| gradient.append("svg:stop") | |
| .attr("offset", "50%") | |
| .attr("stop-opacity", 1) | |
| .attr("stop-color", "#049"); | |
| gradient.append("svg:stop") | |
| .attr("offset", "75%") | |
| .attr("stop-opacity", .25) | |
| .attr("stop-color", "#049"); | |
| gradient.append("svg:stop") | |
| .attr("offset", "100%") | |
| .attr("stop-opacity", 0) | |
| .attr("stop-color", "#049"); | |
| // for(var i = 0; i < 101; i++){ | |
| // gradient.append("svg:stop") | |
| // .attr("offset", i + "%") | |
| // .attr("stop-color", "#049") | |
| // .attr("stop-opacity", circletop(i * .02 - 1)); | |
| // } | |
| svg.selectAll("rect") | |
| .data(dataset) | |
| .enter() | |
| .append("rect") | |
| .attr("x", function(d, i) { | |
| return i * (w / dataset.length); | |
| }) | |
| .attr("y", function(d, i) { | |
| return (h - bottomMargin)*(maxValue - d)/maxValue; | |
| }) | |
| .attr("width", w / dataset.length - barPadding) | |
| .attr("height", function(d, i) { | |
| return h - bottomMargin - (h - bottomMargin)*(maxValue - d)/maxValue; | |
| }) | |
| .style("fill", "url(#gradient)"); | |
| svg.selectAll("text") | |
| .data(dataset) | |
| .enter() | |
| .append("text") | |
| .text(function(d, i) { | |
| return i + 1990; | |
| }) | |
| .attr("text-anchor", "middle") | |
| .attr("x", function(d, i) { | |
| return i * (w / dataset.length) + (w / dataset.length - barPadding) / 2; | |
| }) | |
| .attr("y", function(d) { | |
| return h - 10; | |
| }) | |
| .attr("font-family", "sans-serif") | |
| .attr("font-size", "11px") | |
| .attr("fill", "black"); | |
| </script> | |
| </body> | |
| </html> |
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