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D3 OHLC Chart with Random data
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| license: mit |
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| const DAY_MS = 1000 * 60 * 60 * 24; | |
| const skipbox = document.getElementById('skip'); | |
| const updatebox = document.getElementById('update'); | |
| // create some test data that skips weekends | |
| const generator = fc.randomFinancial() | |
| .filter(fc.randomSkipWeekends); | |
| const data = generator(50); | |
| const xTickFilter = d3.timeDay.filter((d) => d.getDay() === 1); | |
| // use the date to determine the x extent, padding by one day at each end | |
| const xExtent = fc.extentDate() | |
| .accessors([d => d.date]) | |
| .padUnit('domain') | |
| .pad([DAY_MS, DAY_MS]) | |
| // compute the y extent from the high / low values, padding by 10% | |
| const yExtent = fc.extentLinear() | |
| .accessors([d => d.high, d => d.low]) | |
| .pad([0.1, 0.1]) | |
| // Create the gridlines and series | |
| const gridlines = fc.annotationSvgGridline() | |
| .xTicks(xTickFilter); | |
| const candlestick = fc.seriesSvgCandlestick(); | |
| // add them to the chart via a multi-series | |
| const multi = fc.seriesSvgMulti() | |
| .series([gridlines, candlestick]); | |
| // adapt the d3 time scale in a discontinuous scale that skips weekends | |
| const skipWeekendScale = fc.scaleDiscontinuous(d3.scaleTime()) | |
| .discontinuityProvider(fc.discontinuitySkipWeekends()); | |
| function renderChart() { | |
| // create a chart | |
| const chart = fc.chartSvgCartesian( | |
| skipbox.checked ? skipWeekendScale : d3.scaleTime(), | |
| d3.scaleLinear() | |
| ) | |
| .xDomain(xExtent(data)) | |
| .yDomain(yExtent(data)) | |
| .xTicks(xTickFilter) | |
| .plotArea(multi); | |
| // render the chart | |
| d3.select('#streaming-chart') | |
| .datum(data) | |
| .call(chart); | |
| } | |
| function autoUpdate(){ | |
| } | |
| renderChart(); | |
| skipbox.addEventListener('click', renderChart); | |
| updatebox.addEventListener('click', renderChart); |
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| <!DOCTYPE html> | |
| <!-- include polyfills for custom event, Symbol and Custom Elements --> | |
| <script src="//unpkg.com/babel-polyfill@6.26.0/dist/polyfill.js"></script> | |
| <script src="//unpkg.com/custom-event-polyfill@0.3.0/custom-event-polyfill.js"></script> | |
| <script src="//cdnjs.cloudflare.com/ajax/libs/document-register-element/1.8.0/document-register-element.js"></script> | |
| <!-- use babel so that we can use arrow functions and other goodness in this block! --> | |
| <script src="//unpkg.com/babel-standalone@6/babel.min.js"></script> | |
| <script src="//unpkg.com/d3@5.5.0"></script> | |
| <script src="//unpkg.com/d3fc@14.0.3"></script> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 18px sans-serif; | |
| } | |
| .chart { | |
| height: 480px; | |
| } | |
| </style> | |
| <label><input type='checkbox' id='skip'/>Skip Weekends</label> | |
| <label><input type='checkbox' id='update'/>Auto Update</label> | |
| <div id='streaming-chart' class='chart'></div> | |
| <script src='chart.js' type='text/babel'></script> |
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