On Friday, February 9, 2018 at 4:27:46 PM UTC-10, Alex Harsanyi wrote:
> On Saturday, February 10, 2018 at 10:00:29 AM UTC+8, Evan Whitmer wrote:
>> Do you anticipate this playing well with charts that have multiple Y
>> values for a given X value. For example, candlestick plotting
>> has recently landed in racket/plot. It would be great to be able to show
>> all of the values, or at least specify which of the open/high/low/close
>> values to display.
> Yes. The way this is implemented is that you will need to add a callback
> to the returned plot and from the callback add as many overlays as you
> want, where you want them (not necessarily at the X location). The
> advantage of this method is that you can display any value you want on the
> overlay, not just simply the value of the plotted function at the current
> location. The disadvantage is that the feature is not 'free", like the
> zoom-unzoom functionality: the user has to add the callback and provide the
> In my case, most of the interesting use cases do not involve simply
> showing the value of a function at the current location. I put some
> examples here:
> I have not looked at candlestick plots, however, I imagine that you can
> work out what the current value is from the X position and show the
> open/low/high/close values either as a single badge or as markers on the
> relevant positions of the candlestick.
> Best Regards,
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