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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.
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