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December 28, 2018 04:56
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reusable barchart: bostock style
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| license: mit |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.js"></script> | |
| <style> | |
| svg { | |
| border: 1px dotted red; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="runningHistory"></div> | |
| <div id="weatherHistory"></div> | |
| </body> | |
| <script> | |
| function barChart() { | |
| // attributes accessible by caller | |
| let width = 500; | |
| let height = 400; | |
| let barPadding = 5; | |
| let fillColor = 'coral'; | |
| function chart(selection){ | |
| selection.each(function(data) { | |
| var barSpacing = height / data.length; | |
| var barHeight = barSpacing - barPadding; | |
| var maxValue = d3.max(data); | |
| var widthScale = width / maxValue; | |
| d3.select(this).append('svg') | |
| .attr('height', height) | |
| .attr('width', width) | |
| .selectAll('rect') | |
| .data(data) | |
| .enter() | |
| .append('rect') | |
| .attr('y', (d,i) => i * barSpacing) | |
| .attr('height', barHeight) | |
| .attr('x', 0) | |
| .attr('width', d => d * widthScale) | |
| .style('fill', fillColor); | |
| }); | |
| } | |
| chart.width = function(value) { | |
| if (!arguments.length) return margin; | |
| width = value; | |
| return chart; | |
| }; | |
| chart.height = function(value) { | |
| if (!arguments.length) return height; | |
| height = value; | |
| return chart; | |
| }; | |
| chart.barPadding = function(value) { | |
| if (!arguments.length) return barPadding; | |
| barPadding = value; | |
| return chart; | |
| }; | |
| chart.fillColor = function(value) { | |
| if (!arguments.length) return fillColor; | |
| fillColor = value; | |
| return chart; | |
| }; | |
| return chart; | |
| } | |
| var milesRun = [2, 5, 4, 1, 2, 6, 5]; | |
| var highTemperatures = [77, 71, 82, 87, 84, 78, 80, 84, 86, 72, 71, 68, 75, 73, 80, 85, 86, 80]; | |
| var runningChart = barChart().barPadding(10).fillColor('red'); | |
| d3.select('#runningHistory') | |
| .datum(milesRun) | |
| .call(runningChart); | |
| var weatherChart = barChart().fillColor('coral'); | |
| d3.select('#weatherHistory') | |
| .datum(highTemperatures) | |
| .call(weatherChart); | |
| </script> | |
| </html> |
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