Experimental: show weekly downloads sparkline chart #8242
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,181 @@ | ||
| import 'dart:math'; | ||
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| import 'package:_pub_shared/format/encoding.dart'; | ||
| import 'package:web/web.dart'; | ||
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| void create(HTMLElement element, Map<String, String> options) { | ||
| final dataPoints = options['points']; | ||
| if (dataPoints == null) { | ||
| throw UnsupportedError('data-weekly-sparkline-points required'); | ||
| } | ||
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| final svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg'); | ||
| element.append(svg); | ||
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| final toolTip = HTMLDivElement() | ||
| ..setAttribute('class', 'weekly-downloads-sparkline-tooltip'); | ||
| document.body!.appendChild(toolTip); | ||
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| final chartSubText = HTMLDivElement() | ||
| ..setAttribute('class', 'weekly-downloads-sparkline-text'); | ||
| element.append(chartSubText); | ||
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| List<({DateTime date, int downloads})> prepareDataForSparkline( | ||
| String dataPoints) { | ||
| final decoded = decodeIntsFromLittleEndianBase64String(dataPoints); | ||
| final newestDate = DateTime.fromMillisecondsSinceEpoch(decoded[0] * 1000); | ||
| final weeklyDownloads = decoded.sublist(1); | ||
| return List.generate( | ||
| weeklyDownloads.length, | ||
| (i) => ( | ||
| date: newestDate.copyWith(day: newestDate.day - 7 * i), | ||
| downloads: weeklyDownloads[i] | ||
| )).reversed.toList(); | ||
| } | ||
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| drawChart(svg, toolTip, chartSubText, prepareDataForSparkline(dataPoints)); | ||
| } | ||
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| void drawChart(Element svg, HTMLDivElement toolTip, HTMLDivElement chartSubText, | ||
| List<({DateTime date, int downloads})> data) { | ||
| final height = 80; | ||
| final width = 190; | ||
| final drawingHeight = 75; | ||
| final lastDay = data.last.date; | ||
| final firstDay = data.first.date; | ||
| final xAxisSpan = lastDay.difference(firstDay); | ||
| final maxDownloads = data.fold<int>(0, (a, b) => max<int>(a, b.downloads)); | ||
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| final toolTipOffsetFromMouse = 15; | ||
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| (double, double) computeCoordinates(DateTime date, int downloads) { | ||
| final duration = date.difference(firstDay); | ||
| final x = width * duration.inMilliseconds / xAxisSpan.inMilliseconds; | ||
| final y = height - drawingHeight * (downloads / maxDownloads); | ||
| return (x, y); | ||
| } | ||
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| String generateSparkline(List<({DateTime date, int downloads})> data) { | ||
| final line = StringBuffer(); | ||
| var c = 'M'; | ||
| for (final d in data) { | ||
| final (x, y) = computeCoordinates(d.date, d.downloads); | ||
| line.write(' $c$x $y'); | ||
| c = 'L'; | ||
| } | ||
| return line.toString(); | ||
| } | ||
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| String formatDate(DateTime date) { | ||
| final year = '${date.year}'; | ||
| final month = date.month < 10 ? '0${date.month}' : '${date.month}'; | ||
| final day = date.day < 10 ? '0${date.day}' : '${date.day}'; | ||
| return '$year.$month.$day'; | ||
| } | ||
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| // Render chart | ||
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| chartSubText.text = '${formatDate(firstDay)} - ${formatDate(lastDay)}'; | ||
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| final chart = SVGGElement(); | ||
| final frame = SVGRectElement(); | ||
| frame.setAttribute('height', '$height'); | ||
| frame.setAttribute('width', '$width'); | ||
| frame.setAttribute('style', 'fill:white;stroke-width:1;stroke:white'); | ||
| chart.append(frame); | ||
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| final sparklineBar = SVGLineElement(); | ||
| final sparklineCursor = SVGGElement(); | ||
| final sparklineSpot = SVGCircleElement(); | ||
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| sparklineCursor | ||
| ..appendChild(sparklineBar) | ||
| ..appendChild(sparklineSpot); | ||
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| sparklineSpot | ||
| ..setAttribute('class', 'weekly-sparkline') | ||
| ..setAttribute('r', '2'); | ||
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| sparklineBar.setAttribute('class', 'weekly-sparkline-bar'); | ||
| sparklineBar.setAttribute('x1', '0'); | ||
| sparklineBar.setAttribute('x2', '0'); | ||
| sparklineBar.setAttribute('y1', '0'); | ||
| sparklineBar.setAttribute('y2', '$height'); | ||
| chart.append(sparklineCursor); | ||
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| final line = generateSparkline(data); | ||
| final sparkline = SVGPathElement(); | ||
| sparkline.setAttribute('class', 'weekly-sparkline-line'); | ||
| sparkline.setAttribute('d', '$line'); | ||
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| final area = SVGPathElement(); | ||
| area.setAttribute('class', 'weekly-sparkline-area'); | ||
| area.setAttribute('d', '$line L$width $height L0 $height Z'); | ||
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| chart.append(sparkline); | ||
| chart.append(area); | ||
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| svg.append(chart); | ||
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| // Setup mouse handling | ||
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| DateTime? lastSelectedDay; | ||
| chart.onMouseMove.listen((e) { | ||
| sparklineCursor.setAttribute('style', 'opacity:1'); | ||
| toolTip.setAttribute( | ||
| 'style', | ||
| 'top:${e.y + toolTipOffsetFromMouse + document.scrollingElement!.scrollTop}px;' | ||
| 'left:${e.x}px;'); | ||
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| final s = (e.x - chart.getBoundingClientRect().x) / width; | ||
| final selectedDayIndex = | ||
| lowerBoundBy<({DateTime date, int downloads}), double>( | ||
| data, | ||
| (e) => | ||
| e.date.difference(firstDay).inMilliseconds / | ||
| xAxisSpan.inMilliseconds, | ||
| (a, b) => a.compareTo(b), | ||
| s); | ||
| final selectedDay = data[selectedDayIndex]; | ||
| if (selectedDay.date == lastSelectedDay) return; | ||
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| final coords = computeCoordinates(selectedDay.date, selectedDay.downloads); | ||
| sparklineSpot.setAttribute('cy', '${coords.$2}'); | ||
| sparklineCursor.setAttribute('transform', 'translate(${coords.$1}, 0)'); | ||
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| toolTip.text = '${selectedDay.downloads}'; | ||
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| final endDate = selectedDay.date.add(Duration(days: 7)); | ||
| chartSubText.text = | ||
| ' ${formatDate(selectedDay.date)} - ${formatDate(endDate)}'; | ||
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| lastSelectedDay = selectedDay.date; | ||
| }); | ||
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| void erase(_) { | ||
| sparklineCursor.setAttribute('style', 'opacity:0'); | ||
| toolTip.setAttribute('style', 'opacity:0;position:absolute;'); | ||
| chartSubText.text = '${formatDate(firstDay)} - ${formatDate(lastDay)}'; | ||
| } | ||
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| erase(1); | ||
| chart.onMouseLeave.listen(erase); | ||
| } | ||
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| int lowerBoundBy<E, K>(List<E> sortedList, K Function(E element) keyOf, | ||
| int Function(K, K) compare, K value) { | ||
| var min = 0; | ||
| var max = sortedList.length - 1; | ||
| final key = value; | ||
| while (min < max) { | ||
| final mid = min + ((max - min) >> 1); | ||
| final element = sortedList[mid]; | ||
| final comp = compare(keyOf(element), key); | ||
| if (comp < 0) { | ||
| min = mid + 1; | ||
| } else { | ||
| max = mid; | ||
| } | ||
| } | ||
| return min; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -56,6 +56,7 @@ | |
| --pub-detail_tab-text-color: var(--pub-neutral-textColor); | ||
| --pub-detail_tab-underline-color: #dddddd; | ||
| --pub-detail_tab-active-color: #1967d2; | ||
| --pub-weekly-chart-main-color: #0175c2; | ||
| --pub-detail_tab-admin-color: #990000; | ||
| --pub-hash_link-text-color: #ccc; | ||
| --pub-footer-background-color: #27323a; | ||
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This can be simulated without transparency https://stackoverflow.com/questions/58227072/how-do-you-simulate-the-opacity-effect-on-an-element-without-making-it-transpare