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

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Scott Senften
Scott Senften 2017-9-19
评论： Joris Brouwer 2022-9-12
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?
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Campion Loong
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
Walter Roberson 2017-9-22
Campion Loong, I suggest you copy your responses to be an Answer so they can be Accepted.

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Campion Loong
Campion Loong 2017-9-22
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
Scott Senften
Scott Senften 2017-9-24
function mouseButtonPressed(this, object, eventdata, ax)
disp('in mouseButtonPressed')
eventdata.IntersectionPoint
disp(['pick: ', datestr(num2ruler(eventdata.IntersectionPoint(1), ax.XAxis))])
end
Joris Brouwer
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.

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