Geom not exported?

[bergsmat]

Hi!

Thanks for the help at https://github.com/hadley/ggplot2/wiki/Creating-a-new-geom .

The link to sample code breaks, so I harvested code from the page and added ggplot(data=data.frame(x=5,y=5,angle=pi/6,length=0.2),mapping=aes(x=x,y=y,angle=angle,length=length)) + layer(geom='field').

I had to change Geom to ggplot2:::Geom apparently because Geom is not exported. Will that survive modern CRAN check? Also, my example above gives Error: attempt to apply non-function. It would be very useful to author new geoms for use with particular data types. Thanks in advance for any comments.

[lionel-]

@hadley
The other proto objects Stat and Position should be exported too as they can be useful to extend ggplot.

Here is an example where I derived from Stat: http://stackoverflow.com/questions/10071944/ggplot2-geom-point-with-binned-x-axis-for-binary-data/24995101#24995101

[hadley]

I was just waiting for someone to ask for them ;)