Candlestick plotter

[przmv]

This PR introduces the dyCandlestick function to render Candlestick/OHLC chart with dygraphs:

library(xts)
data(sample_matrix)
library(dygraphs)
dygraph(sample <- matrix) %>%
  dyCandlestick()

and the output is the following:

This PR implements some features discussed in #3
CC: @danielkrizian

[renkun-ken]

Looks nice!

[jjallaire]

Does this impose any requirements on the input data (e.g. number of series). If so perhaps the function should validate that and throw an error if the data isn't as required.

[przmv]

@jjallaire it checks for the number of series on the JavaScript side, i.e. if the number of series is lesser than four it switches back to line plotter, otherwise if the amount of series is greater than four it plots the first four series with candlestick plotter and the rest with line plotter.

[jjallaire]

@pshevtsov This is looking great. I've moved the documentation into the docs/ folder. Could you add a page about the candlestick plugin? You just need to create an Rmd (e.g. "gallery-candlestick.Rmd") in the fashion of the other ones then add a link to it from the sidebar (https://github.com/rstudio/dygraphs/blob/master/docs/include/before_body.html)

[przmv]

@jjallaire Sure thing! BTW, how should I generate html file from that Rmd one?

[jjallaire]

Just call rmarkdown::render_site within the docs directory

On Mon, Oct 31, 2016 at 9:45 AM, Petr Shevtsov [email protected]
wrote:

@jjallaire https://github.com/jjallaire Sure thing! BTW, how should I
generate html file from that Rmd one?

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[przmv]

@jjallaire Ready. I decided not to commit generated *.html files, since the output seems to be system dependent and the diff with the upstream was huge.