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Using arbitrary Leaflet JS plugins with Leaflet for R

The Leaflet JS mapping library has lots of plugins available. The Leaflet package for R provides direct support for some, but far from all, of these plugins, by providing R functions for invoking the plugins.

If you as an R user find yourself wanting to use a Leaflet plugin that isn't directly supported in the R package, you can use the technique shown here to load the plugin yourself and invoke it using JS code.

This is an initial, real time prototype of bandlines styled with a divergent ColorBrewer2 palette that is a good choice for finance and accessibility.

The implementation is in mid-transition toward using a new functional reactive programming library, flyd.

From the original bl.ock::

Bandlines were invented by Stephen Few as background for sparklines to aid quick interpretation, crucial on dashboards: *"Bandlines use horizontal bands of color in the background of the plot area to display information about the distribution of values. This information is similar to that found in a box plot. To do this you must gather information about how values related to the measure that will be featured in the sparkline are distributed during a period of history that usually extends further into the past than the values that will appear in the sparkline itself. [...] Bandlines may

	// no d3 so assumes d3 v3 already loaded

	var multiCrowbar = (function() {
	/*
	* SVG Export
	* converts html labels to svg text nodes
	* will produce incorrect results when used with multi-line html texts
	*
	* Author: Gregor Aisch
	* based on https://github.com/NYTimes/svg-crowbar/blob/gh-pages/svg-crowbar-2.js

	[
	{
	"name": "",
	"i": [
	73,
	96,
	96,
	121,
	98,
	121,

	license: mit
	height: 100