Looks awesome! 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 >> <https://github.com/racket/plot/blob/9c8960d40772cc61211ff5d9ab185f9cf931b044/plot-lib/plot/private/plot2d/point.rkt#L254> >> >> 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. >> >> Evan >> >> > 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 > overlays. > > 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: > https://alex-hhh.github.io/2018/02/interactive-overlays-with-the-racket-plot-package.html > > 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, > Alex. > > > >
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