cristianpachacama/dygraph-extra

Add export to png capability to dygraphs

dygraph-extra

A modified version of the original dygraph-extra JavaScript library that adds the ability to export dygraph plots as a png image, among other things. Intended to be used in shiny with dygraphs for R, but dygraph-extra.js does work as a standalone.

Refer to the shiny-example for the actual files and an example of basic usage.

Dependencies:

• jQuery (loaded by shiny automatically)
• JSZip (only required if downloading multiple dygraphs in a single link)

License:

• The modifications were made by Jimmy Oh for the Ministry of Business, Innovation and Employment. It is released under CC BY. Attribution should be made to MBIE.

dygraph-extra.js

This is a modified version of dygraph-extra.js originally released in 2011 by Juan Manuel Caicedo Carvajal.

The modifications are:

• Fixed y label positioning.
• Automatic detectection of fonts for the labels, rather than relying on predefined or user-supplied fonts. This still isn't perfect, but should be closer to the actual dygraph.
• Fix overflow of legends for too many series (legends now wrap).
• A method for registering dygraphs via a drawcallback, primarily useful for those using the R version of dygraphs.
• A function for downloading one or more registered dygraphs where the dygraphs to download are identified by their id and where multiple plots are zipped together using JSZip.
• Functions to address some bugs/annoyances with dygraphs:
  • correct automatic resize on visiblity change.
  • correct clearance of selection on mouseleave.

dygraph-extra-shiny.R

Contains a number of R functions that make it easier to use dygraph-extra.js in shiny.

Example: dyDownload

dyDownload("dyout", "Download Plot", asbutton = TRUE)

Example: dyDownloadGroup

dyDownloadGroup("oecoDyDownloads", "Download Plots:", c(
      "Value added by tourism as a percentage of GDP" = "oecogdpperc",
      "Value added by tourism" = "oecogdp",
      "Tourism employment as a percentage of total employment" = "oecoempperc",
      "Tourism employment" = "oecoemp",
      "International tourism as a percentage of total exports" = "oecoexpperc",
      "Total expenditure" = "oecospend"
   ))