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dot/circle normal distribution
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| license: mit |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| //SVG setup | |
| const margin = {top: 10, right: 30, bottom: 30, left: 30}, | |
| width = 550 - margin.left - margin.right, | |
| height = 480 - margin.top - margin.bottom; | |
| const svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", | |
| `translate(${margin.left}, ${margin.top})`); | |
| // datasource | |
| const allData = d3.range(200).map( (d,i) => ({ | |
| Name: i, | |
| Value: +d3.randomNormal(20, 3.5)().toFixed(1) | |
| })); | |
| //x scales | |
| const x = d3.scaleLinear() | |
| .domain(d3.extent(allData, d => +d.Value)) | |
| .rangeRound([0, width]); | |
| //number of bins for histogram | |
| const nbins = 30; | |
| function moveToDistribution(){ | |
| //histogram binning | |
| const histogram = d3.histogram() | |
| .domain(x.domain()) | |
| .thresholds(x.ticks(nbins)) | |
| .value(d => +d.Value); | |
| //binning data and filtering out empty bins | |
| const bins = histogram(allData); | |
| console.log(bins) | |
| //g container for each bin | |
| let binContainer = svg.selectAll("g.gBin") | |
| .data(bins) | |
| .enter() | |
| .append("g" ) | |
| .attr("class", "gBin") | |
| .attr("transform", d => `translate(${x(d.x0)}, ${height})`) | |
| .selectAll("circle") | |
| .data(d => d.map((p, i) => { | |
| return {value: p.Value, | |
| radius: (x(d.x1)-x(d.x0))/2.5} | |
| })) | |
| .enter() | |
| .append("circle") | |
| .attr("class", "enter") | |
| .attr("cx", 0) //g element already at correct x pos | |
| .attr("cy", (d, i) => { | |
| return - i * 2 * d.radius - d.radius}) | |
| .attr("r", d => d.radius); | |
| // add x axis | |
| svg.append("g") | |
| .attr("class", "axis axis--x") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(d3.axisBottom(x)); | |
| };//moveToDistribution | |
| //draw everything | |
| moveToDistribution(); | |
| </script> | |
| </body> | |
| </html> |
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