Transform a spatial object to a grob
# S4 method for geom
gc_grob(input = NULL, theme = gtTheme, ...)the object to transform to class grob.
[gtTheme(1)] the theme from which to take parameters.
Depending on the provided geometry either a pointsGrob,
Other spatial classes:
gc_geom(),
gc_ppp(),
gc_raster(),
gc_sf(),
gc_sp()