Holoviews: Feature request candlestick plots

[ahuang11]

New hv element
https://bokeh.pydata.org/en/latest/docs/gallery/candlestick.html

Or maybe simply let users input the min, 25, 75, max into hv.BoxWhisker and that would be a candlestick?

Or stacking errorbars and have an opt to swap between a rectangular bar vs line http://holoviews.org/reference/elements/bokeh/ErrorBars.html#bokeh-gallery-errorbars

[poplarShift]

I think as a first step it would be worthwhile to put the individual components and their associated plotting code of a BoxWhisker into separate elements/functions. Currently, a BoxWhisker does the calculation of all the boxes (VBar or HBar) and the whiskers (as Segment) in one go.

Would it make sense to split this up into utils

1. data_to_quantiles (backend-agnostic)
2. quantiles_to_bokeh_element (for bokeh, say)
   
   
   
   1. quantiles_to_whiskers
   
   
   2. quantiles_to_bar
      
      ...
   
   

and then for the individual elements (such as BoxWhisker) compose the outputs of number 2.?

[ahuang11]

That sounds like a good plan

[ahuang11]

For bokeh specifically, I'm imagining BoxWhisker inherits from CandleStick?

the util functions: _draw_segments, _draw_bars, _draw_points
CandleStick is segments + bars which accepts a lower, upper, "q1" and "q3"
BoxWhisker is segments + bars + median point + outlier points which accepts a lower, upper, q1, q2, q3 (or automatically compute it from data if 5 vdims aren't provided?)

[dofine]

any progress on this, plz?

[ahuang11]

No update from me