Reversion from last point where points worked. Will return to shapes later if there is time, but for the time being, shapes must be circles and can be open or closed manipulating fill and colour.
For use if I return to scale_shape().
Extra segment definition, never would be called due to else if chain.
Improved gg2animint comments - lists of supported geoms, scales, etc.
Added newline at end of file to keep roxygenize() from complaining.