格式化Charts_flutter时间序列图中的时间标签，使其包含hh：mm：ss

时间：2018-08-22 10:08:10

标签： charts dart flutter

是否可以在chart_flutter时间序列图的xAxis上设置标签格式以显示 hh：mm：ss 。 This answer解释了如何格式化代码以显示月份和日期，但是我需要显示的信息每分钟收集几次。

charts.AutoDateTimeTickFormatterSpec不允许指定秒数。关于上述问题的操作表提到了Charts_flutter画廊中提到的DateTimeFactory，但我也不确定如何使用它，或者在这种情况下是否有任何用途。

new charts.TimeSeriesChart(
  getSeries(item),
  animate: false,
  primaryMeasureAxis: new charts.NumericAxisSpec(
    tickProviderSpec: new charts.BasicNumericTickProviderSpec(zeroBound: false)
  ),
  domainAxis: new charts.DateTimeAxisSpec(
    tickFormatterSpec: new charts.AutoDateTimeTickFormatterSpec(
      hour: new charts.TimeFormatterSpec(format: 'hh', transitionFormat: 'dd/MM hh:mm'),
    )
  ),
),

或者，我可以使用其他图表来实现此功能吗？我看到charts.BarChart允许在xAxis上使用字符串，但是我特别需要一个折线图-如果无法进行上述格式化，是否可以通过某种方式在折线图上指定字符串而不是日期时间？

1 个答案:

答案 0 :(得分：1)

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Shelving Unit","apo":"","asn":"n\/a","awdate":"","anotes":"Transaction GID: 91925, Original 24inch cabinets, $188.15\nTransaction GID: 667201, Miscellaneous wood shelving and supports to combine cabinets together across tech-wall window\n","childCount":"0","a_account":"17200: Office Furniture","d_account":"17999: Accumulated Depreciation","loaded":true,"parent":"216","level":0,"isLeaf":true},{"id":"33","parentid":"219","aname":"Workbench","aid":"412","did":"505","pcondition":"n","pdescription":"Miscellaneous components and materials to build u-shaped workbench and workbech island","pdate":"06\/01\/2013","pcost":"754.25","pvendor":"Home Depot\/Walmart","ssold":"n","sdescription":"","sdate":"","sprice":"0.00","sexpense":"0.00","alocation":"Tech","adescription":"Tech Area Workbench & Island","apo":"","asn":"n\/a","awdate":"","anotes":"Transaction GID: 135773,96311,96542,96572,96646,96801,96823,96893,130251,130071,130082,677974,132491,132493,132497,133240,667352","childCount":"0","a_account":"17200: Office Furniture","d_account":"17999: Accumulated Depreciation","loaded":true,"parent":"219","level":0,"isLeaf":true}]} 中进行了设置，因此没有意义。标签之间可以达到的最小间隔是5分钟。 MinuteTimeStepper默认间隔为5、10、15、20和30分钟。

MinuteTimeStepper

它具有一个构造函数，可让您传递自己的列表，但我不知道如何使它起作用。

相反，我只是将其修改为class MinuteTimeStepper extends BaseTimeStepper { static const _defaultIncrements = const [5, 10, 15, 20, 30]; ，现在它以1分钟的间隔绘制标签（如果有可用空间）。

考虑到最接近标签的标签（即使进行了此更改）是每分钟，所以没有必要加上秒。

接受the sample并将系列数据修改为

const [1, 5, 10...

赋予标签以默认格式 new TimeSeriesSales(new DateTime(2018, 8, 22, 13, 00, 00), 15), new TimeSeriesSales(new DateTime(2018, 8, 22, 13, 00, 30), 5), new TimeSeriesSales(new DateTime(2018, 8, 22, 13, 01, 00), 25), new TimeSeriesSales(new DateTime(2018, 8, 22, 13, 01, 30), 20), new TimeSeriesSales(new DateTime(2018, 8, 22, 13, 02, 00), 10), 和1 00和01（精确为1PM，分别是1分钟和2分钟）读取的标签。 02。请注意，半分钟的点是按预期方式绘制的，但未按预期标记。

如果您想要24小时制，可以添加mm之类的

h mm
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