Just mucking about with D3. Trying to remember how it works.
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February 21, 2019 18:54
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D3 bar chart tests
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| license: mit |
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| <!DOCTYPE html> | |
| <html lang="eng"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <style> | |
| body {text-align:center} | |
| svg { font-family: Courier;} | |
| </style> | |
| <title>Labelled Bar Chart</title> | |
| <script src="https://d3js.org/d3.v5.js"></script> | |
| </head> | |
| <body> | |
| <svg width=600 height=500> | |
| <text class="title" x=0 y=30>This example is overly complicated. Simplify with scales.</text> | |
| </svg> | |
| <script type="text/javascript"> | |
| console.clear() | |
| var data = [], | |
| num_elements = 20, | |
| max_value = 30 | |
| // Generate some data | |
| for (var i = 0; i < num_elements; i++) { | |
| var newNum = Math.ceil( Math.random() * max_value ); | |
| data.push(newNum); | |
| } | |
| const svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"), | |
| margin= 20 | |
| barPadding = 1, | |
| barSpan = width / data.length | |
| y = d3.scaleLinear() | |
| .range([height-margin, margin]) | |
| .domain([0, max_value]) | |
| svg.selectAll("rect") | |
| .data(data) | |
| .enter() | |
| .append("rect") | |
| .attr("x", (d, i) => i * barSpan) | |
| .attr("y", d => height - y(d)) | |
| //.attr("y", d => height - (d * 4)) | |
| .attr("width", barSpan - barPadding) | |
| .attr("height", d => y(d)) | |
| .attr("fill", d => d == Math.max.apply(Math, data) ? "crimson" : '#B0A6A4'); | |
| svg.selectAll("text") | |
| .data(data) | |
| .enter() | |
| .append("text") | |
| .text(d => d > 4 ? d : '') | |
| .attr("x", (d, i) => | |
| i * (width / data.length) + (width / data.length - barPadding) / 2 | |
| ) | |
| .attr("y", d => height - (d * 4) + 14) | |
| .attr("font-family", "sans-serif") | |
| .attr("font-size", "11px") | |
| .attr("fill", "white") | |
| .attr("text-anchor", "middle"); | |
| </script> | |
| </body> | |
| </html> |
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