Dark theme for Incanter charts

JFreeChart has been a fantastic library, I’ve been able to include useful charting functionality in Incanter very quickly because of it, but I’m not a big fan of its default visual theme. Eventually I’d like to create some new themes, or better yet include themes created by others, but in the meantime I have created the set-theme function, which accepts a chart and either a keyword indicating a built-in theme or a JFreeChart ChartTheme object, and applies the theme to the chart.

At the moment, the only built-in themes are :default and :dark, but hopefully that will change in the future.

Here’s an example of using set-theme. First I’ll create a chart with the default theme,

(use '(incanter core charts datasets))

(with-data (get-dataset :iris)
  (view (scatter-plot :Sepal.Length :Sepal.Width :group-by :Species)))

and here’s the same scatter-plot with the dark theme.

(with-data (get-dataset :iris)
  (doto (scatter-plot :Sepal.Length :Sepal.Width :group-by :Species)
    (set-theme :dark)
    view))

The set-theme function is available in the latest version Incanter @ Github.

I have also added the incanter-pdf module discussed in the previous blog post, but it isn’t installed by default. To install it in your local Maven repository, run ‘mvn install’ from the incanter/modules/incanter-pdf directory.