HexJSON HTMLWidget for R, Part 2

By Tony Hirst

(This article was first published on Rstats – OUseful.Info, the blog…, and kindly contributed to R-bloggers)

In my previous post – HexJSON HTMLWidget for R, Part 1 – I described a first attempt at an HTMLwidget for displaying hexJSON maps using d3-hexJSON.

I had another play today and added a few extra features, including the ability to:

  • add a grid (as demonstrated in the original d3-hexJSON examples),
  • modify the default colour of data and grid hexes,
  • set the data hex colour via a col attribute defined on a hexJSON hex, and
  • set the data hex label via a label attribute defined on a hexJSON hex.

We can now also pass in the path to a hexJSON file, rather than just the hexJSON object:

Here’s the example hexJSON file:

And here’s an example of the default grid colour and a custom text colour :

I’ve also tried to separate out the code changes as separate commits for each feature update: code checkins. For example, here’s where I added the original colour handling.

I’ve also had a go at putting some docs in place, generated using roxygen2 called from inside the widget code folder with devtools::document(). (The widget itself gets rebuilt by running the command devtools::install().)

Next up – some routines to annotate a base hexJSON file with data to colour and label the hexes. (I’m also wondering if I should support the ability to specify arbitrary hexJSON hex attribute names for label text (label) and hex colour (col), or whether to keep those names as a fixed requirement?)

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