How to interpret ButtonDownFcn event data for axis which limit is datetime?

20 次查看（过去 30 天）

显示更早的评论

Scott Senften 2017-9-19

3
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/357449-how-to-interpret-buttondownfcn-event-data-for-axis-which-limit-is-datetime

评论： Joris Brouwer 2022-9-12

采纳的回答： Campion Loong

image.png

在 MATLAB Online 中打开

This seems like something obvious but I've searched for this all afternoon and can't come up with anything that addresses my issue. I've been struggling with my buttondownfcn callback on an axes which xaxis is defined in datetime.

K>> ax.XAxis
ans = 
    DatetimeRuler with properties:
               Limits: [Aug 21, 2017, 21:00    Aug 21, 2017, 22:45]
           TickValues: [Aug 21, 2017, 21:00    Aug 21, 2017, 21:15    Aug 21, 2017, 21:30    Aug 21, 2017, 21:45    Aug 21, 2017, 22:00    Aug 21, 2017, 22:15    Aug 21, 2017, 22:30    Aug 21, 2017, 22:45]
      TickLabelFormat: 'HH:mm'
    Show all properties

The eventinformation comes in as

K>> eventdata
eventdata = 
    Hit with properties:
                 Button: 1
      IntersectionPoint: [0.927083313465118 5.139902343750000e+02 -1]
                 Source: [1×1 Axes]
              EventName: 'Hit'

I've read that is the "location of last button click, in axes data units", but the x value doesn't look like a datenum. I thought it might be an offset from the axis limit but

K>> ax.XLim(1)+eventdata.IntersectionPoint(1)
ans = 
    datetime
     Aug 22, 2017, 19:14

is not where I picked. I picked as closed to the 22:15 tick mark (in the attached image) as I could. It's close but there's an origin somewhere that I seem to be missing.

Can anyone shed some light on this?

6 个评论
显示 4更早的评论隐藏 4更早的评论

Campion Loong 2017-9-22

You're welcome Scott. Hope it does solve your needs at the end.

On a side note, since you have a datetime coming out of num2ruler, you can directly convert it to text using char(...) or, if you have 16b or later, string(...)

Walter Roberson 2017-9-22

Campion Loong, I suggest you copy your responses to be an Answer so they can be Accepted.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Campion Loong 2017-9-22

4
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/357449-how-to-interpret-buttondownfcn-event-data-for-axis-which-limit-is-datetime#answer_282762

As Walter suggested, pasting my comment as answer:

Give these functions a try and see if they suit your needs. Looking at your question, num2ruler is a more likely candidate. You'll need to pass it the specific ruler you are working with:

num2ruler

ruler2num

2 个评论
显示无隐藏无

Scott Senften 2017-9-24

在 MATLAB Online 中打开

          function mouseButtonPressed(this, object, eventdata, ax)
               disp('in mouseButtonPressed')
              eventdata.IntersectionPoint
              disp(['pick: ', datestr(num2ruler(eventdata.IntersectionPoint(1), ax.XAxis))])
          end

Joris Brouwer 2022-9-12

Thanks! This was not trivial once I zoomed in or panned the figure. Should be in Matlab documentation itself for the ButtonDownFcn. But this works exactly as intended.

请先登录，再进行评论。