Allow day scale show week division

[dennissterzenbach]

This PR enables you to display a time axis with day scale and divide it into weeks with majorLabels showing the week number. Simply set showWeekScale and the majorLabels will switch between monthly scale and week scale, keeping the overall division by days.

I would expect that setting these options:

{
  locale: 'de',
  timeAxis: {
    scale: 'day',
    step: 1
  },
  showWeekScale: true,
  format: {
    minorLabels: {day: 'DD.MM'},
    majorLabels: {day: 'w'}
  }
}

lead to the following result:

... | 18                                                           | 19 ...
... | 02.05. | 03.05. | 04.05. | 05.05. | 06.05. | 07.05. | 08.05. | 09.05. ...

However, the result before this PR was instead:

... | 17     | 18                                                           
... | 01.05. | 02.05. | 03.05. | 04.05. | 05.05. | 06.05. | 07.05. | 08.05. | 09.05. ...

[tursics]

Looks good to me

[mojoaxel]

Thanks! LGTM!

[mojoaxel]

Manually merged with fbdada2

[vis-bot]

🎉 This PR is included in version 7.7.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[mojoaxel]

@dennissterzenbach Thank you very much for this PR! 🎉
Sorry that it was merged soooo late, but I guess we have to consider this project unmaintained at the moment 😞