Trying to figure out categorical historgrams
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June 6, 2017 15:02
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Grade Histogram
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| height: 300 |
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| ["A","A","A","A-","B+", | |
| "B","B","B-","B-","C+", | |
| "C","C-","D+","D","F"] |
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| <svg width="500" height="200" id=canvas border=1></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var y = d3.scaleLinear(); | |
| var svg = d3.select("#canvas"), | |
| margin = {top:10,bottom:60,left:100,right:10}, | |
| barPad = 6, | |
| width = +svg.attr("width")-margin.left-margin.right, | |
| height = +svg.attr("height")-margin.top-margin.bottom, | |
| g = svg.append("g") | |
| .attr("transform","translate("+margin.left+","+margin.right+")") | |
| .attr("class","canvas"); | |
| var yAxis = d3.axisLeft().scale(y); | |
| var xAxis = g.append("g") | |
| .attr("class", "axis axis--x") | |
| .attr("transform", "translate(0," + height + ")"); | |
| g.append("g").classed("yAxis",true); | |
| doHist(); | |
| function doHist(){ | |
| var url='data.json'; | |
| d3.json(url, function(data){ | |
| var grades = ["A","A-","B+","B","B-","C+","C","C-","D+","D","F"]; | |
| var x = d3 .scaleBand() | |
| .domain(grades) | |
| .padding(.1) | |
| .range([0,width]); | |
| var histData = d3.histogram() | |
| .domain([0,width]) | |
| .thresholds(grades.map(x)) | |
| (data.map(x)); | |
| console.log(histData); | |
| y.domain([0,d3.max(histData,function(d){return d.length;})]) | |
| .range([height,0]); | |
| var d3Data = g.selectAll('rect.bar').data(histData); | |
| var bandwidth = x.bandwidth(); | |
| d3Data.attr("x",function(d){return d.x0;}) | |
| .transition() | |
| .attr("y",function(d){return y(d.length);}) | |
| .attr("height",function(d){return height-y(d.length)}) | |
| d3Data.enter() | |
| .append("rect") | |
| .classed("bar",true) | |
| .attr("x",function(d){return d.x0;}) | |
| .attr("y",function(d){return y(d.length);}) | |
| .attr("width",bandwidth) | |
| .attr("height",function(d){return height-y(d.length)}) | |
| .style("fill","red"); | |
| var axis = d3.axisBottom().scale(x).tickSize(11); | |
| xAxis.call(axis); | |
| g.append("text") | |
| .attr("transform", "translate("+ (width/2) +"," + (height+50) + ")") | |
| .text("Grades"); | |
| g.append("g") | |
| .attr("transform", "translate( -70 ," + (height/2) + ") rotate(-90)") | |
| .append("text") | |
| .text("Count"); | |
| g.select("g.yAxis") | |
| .transition().duration(1500) | |
| .call(yAxis); | |
| }); | |
| } | |
| </script> |
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