Requires 'area' and 'subgroup'. Strange things will happen if
geom_treemap_subgroup_border is given a different dataset or area
aesthetic than the geom_treemap it is drawn over.
geom_treemap_subgroup_border(mapping = NULL, data = NULL,
stat = "identity", position = "identity", na.rm = FALSE,
show.legend = NA, inherit.aes = TRUE, fixed = F, ...)Standard
geom arguments as for geom_rect.
Logical, indicating whether the fixed layout algorithm should be
used. Defaults to false. See geom_treemap for full details.
area (required)
subgroup (required)
colour
size
linetype
alpha
geom_treemap, geom_treemap_subgroup_text