draw a histogram for discrete-type data.
Created
January 11, 2014 16:15
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Histogram2
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .axis path, .axis line { | |
| fill: none; | |
| stroke: black; | |
| shape-rendering: crispEdges; | |
| } | |
| .axis text { | |
| fill: black; | |
| font-size: 12px; | |
| } | |
| .bar { | |
| fill: darkcyan; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.js"></script> | |
| <script> | |
| var margin = 70; | |
| var w = 700-2*margin; | |
| var h = 500-2*margin; | |
| var svg = d3.select('body') | |
| .append("svg") | |
| .attr({ | |
| width:w+2*margin, | |
| height:h+2*margin | |
| }) | |
| .append("g") | |
| .attr("transform", "translate("+margin+","+margin+")"); | |
| //scales | |
| var xScale = d3.scale.ordinal() | |
| .rangeRoundBands([0, w], .1); | |
| var yScale = d3.scale.linear() | |
| .range([h, 0]); | |
| //create axises. | |
| var xAxis = d3.svg.axis() | |
| .scale(xScale) | |
| .orient("bottom"); | |
| var yAxis = d3.svg.axis() | |
| .scale(yScale) | |
| .orient("left"); | |
| //Asynchronised. This returns immediately. | |
| d3.csv("sample.csv") | |
| .row(function(d){return {class: d.class, count: +d.count};}) | |
| .get(function(error, rows){ | |
| //set domains of the scales. | |
| xScale.domain(rows.map(function(d){return d.class;})); | |
| yScale.domain([0, d3.max(rows, function(d){return d.count;})]).nice(); | |
| //draw x axis | |
| svg.append("g") | |
| .attr({ | |
| class: "x axis", | |
| transform: "translate(0,"+h+")" | |
| }) | |
| .call(xAxis) | |
| .selectAll("text") | |
| .style("text-anchor", "end") | |
| .attr({ | |
| transform: "rotate(-65, -3, 12)" | |
| }); | |
| //draw y axis | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis) | |
| .append("text") | |
| .attr({ | |
| y: 5, | |
| x: 50 | |
| }) | |
| .style("text-anchor", "end") | |
| .text("students"); | |
| //draw bars. | |
| svg.selectAll(".bar") | |
| .data(rows) | |
| .enter() | |
| .append("rect") | |
| .attr({ | |
| class: "bar", | |
| x: function(d){return xScale(d.class);}, | |
| width: xScale.rangeBand(), | |
| y: function(d){return yScale(d.count);}, | |
| height: function(d){return h-yScale(d.count);} | |
| }) | |
| .style("stroke", "white"); | |
| }); | |
| </script> |
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| class | count | |
|---|---|---|
| 0-10 | 2 | |
| 10-20 | 1 | |
| 20-30 | 7 | |
| 30-40 | 9 | |
| 40-50 | 15 | |
| 50-60 | 23 | |
| 60-70 | 20 | |
| 70-80 | 13 | |
| 80-90 | 6 | |
| 90-100 | 4 |
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