Add or enable direct labelling of curves

[bailliem]

Provide support to direct label survival curves instead of a legend. Two strata with risk table is ok, but more then its a lot of work to map which line goes with which row in the risk table etc. Direct labelling with additional encoding (u.e. colour) to support the reader would be an elegant solution.

Things to discuss:

• Do we provide a function or is there a ggplot2 package that supports this directly so we don't need to?
• Can we extend/borrow existing attempts such as here https://ggobi.github.io/ggally/articles/ggsurv.html
• How are lines, legends and risk tables all aesthetically designed to be informative and consistent? Using colour, fonts, ordering, etc to support?

[ddsjoberg]

In the ggsurv package, they leave it to the user to manually add the labels with ggplot2::annotate(), which our users can do as well. I think it will be very difficult to provide a better UI than the ggplot function.

[ddsjoberg]

@bailliem will add an example of this to the gallery.

[ddsjoberg]

@bailliem hey hey! is this something you're still planning on doing?