Draw a treemap, where each observation is represented by a tile scaled by an area aesthetic.
<U+2018>area<U+2019> is the only required aesthetic. Other aesthetics are accepted as for
geom_rect. See geom_treemap_text to label tiles.
An optional <U+2018>subgroup<U+2019> aesthetic will cause the tiles to be clustered in
subgroups within the treemap. See geom_treemap_subgroup_border and
geom_treemap_subgroup_text to draw a border around subgroups and label
them respectively.
With the default tile layout algorithm (fixed = F), tile placement
proceeds from the bottom left corner, moving alternately rightwards and
upwards until all tiles are placed. See Bruls et al. (1999) for the full
algorithm.
With the fixed tile layout algorithm (fixed = T), tile placement fills
columns from left to right, beginning at the bottom of each column. However,
unlike with the default algorithm, the order in which tiles are placed is
fixed by their order in the input data frame. While this can result in some
aesthetically unpleasing tiles, it allows side-by-side comparisons or
animations to be created. If the fixed algorithm is used for geom_treemap, it
should also be used for all other treemap geoms in the plot or they will not
share a common layout.
geom_treemap(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.
area (required)
alpha
colour
fill
linetype
subgroup
The default tile layout uses the Squarified Treemap algorithm of Mark Bruls, Kees Huizing and Jarke van Wijk:
Bruls, M., Huizing, K., & van Wijk, J. (1999). Squarified Treemaps (pp. 33-42). Presented at the In Proceedings of the Joint Eurographics and IEEE TCVG Symposium on Visualization. http://www.win.tue.nl/~vanwijk/stm.pdf
geom_treemap_text, geom_treemap_subgroup_border, geom_treemap_subgroup_text