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<!DOCTYPE html> |
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<html> |
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<meta charset="utf-8"> |
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<script src="https://d3js.org/d3.v5.min.js"></script> |
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<script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script> <!-- for color scales --> |
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<style> |
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body {font-family: calibri;} |
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.axis {font: 14px calibri;} |
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.label {font: 16px calibri;} |
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</style> |
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<body> |
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<h2>Bar Chart 1</h2> |
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<p>The bar represents the total number of students (Graduate and Undergraduate) based on the country.<br>These countries are part of Europeran Union.</p> |
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<div><svg id="chart1" width="700" height="300"></svg></div> |
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<script> |
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// chart 1 |
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var svg1 = d3.select("#chart1"), |
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margin = {top: 20, right: 20, bottom: 30, left: 40}, |
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width = +svg1.attr("width") - margin.left - margin.right, |
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height = +svg1.attr("height") - margin.top - margin.bottom; |
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var x1 = d3.scaleBand().rangeRound([0, width]).padding(0.2), |
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y1 = d3.scaleLinear().rangeRound([height, 0]); |
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var g1 = svg1.append("g") |
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); |
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// load data |
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d3.csv("BarChartEU.csv").then(function(data) { |
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data.forEach(function(d) { |
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d.numStudents = parseInt(d.numStudents); |
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console.log("numStudents:"+d.numStudents); |
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}); |
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// See https://www.dashingd3js.com/d3js-scales |
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// maps domain of x values (letters) to range of positions on x-axis |
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x1.domain(data.map(function(d) { return d.Country ; })); |
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// maps domain of y values (frequencies 0, max freq) to range of positions on y-axis |
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y1.domain([0, d3.max(data, d => d.numStudents)]); // shorthand |
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// x-axis |
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g1.append("g") |
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.attr("class", "axis x-axis") |
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.attr("transform", "translate(0," + height + ")") // move axis to bottom of chart |
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.call(d3.axisBottom(x1)); |
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// y-axis label |
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g1.append("text") |
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.attr("class", "label") |
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.attr("x", 195-margin.left) // set x position of label |
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.attr("y", 311-margin.bottom) // set y position of label |
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.style("text-anchor", "start") // left-justify |
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.text ("Names of Countries (European Union)") |
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// y-axis |
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g1.append("g") |
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.attr("class", "axis y-axis") |
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.call(d3.axisLeft(y1).ticks(10, "#")); // number of ticks and type |
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// y-axis label |
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g1.append("text") |
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.attr("class", "label") |
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.attr("x", 0-margin.left) // set x position of label |
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.attr("y", 0-margin.top/2) // set y position of label |
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.style("text-anchor", "start") // left-justify |
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.text ("Number of Students") |
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// bars |
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g1.selectAll(".bar") |
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.data(data) |
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.enter().append("rect") |
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.attr("class", "bar") |
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.attr("x", function(d) { console.log ("letter: " + d.Country + ", x: " + x1(d.Country )); return x1(d.Country ); }) |
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.attr("y", function(d) { console.log ("freq: " + d.numStudents + ", y: " + d.numStudents); return y1(d.numStudents); }) |
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.attr("width", x1.bandwidth()) // width of each band |
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.attr("height", function(d) { return height - y1(d.numStudents); }) |
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.style("fill", function(d, i) { return "steelBlue"; }); // color of the bars |
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; |
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}); |
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</script> |
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</body> |
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</html> |
