geom_node_tile function

Draw the rectangles in a treemap

A treemap is a space filling layout that recursively divides a rectangle to the children of the node. Often only the leaf nodes are drawn as nodes higher up in the hierarchy would obscure what is below. geom_treemap is a shorthand for geom_node_treemap as node is implicit in the case of treemap drawing

geom_node_tile(
  mapping = NULL,
  data = NULL,
  position = "identity",
  show.legend = NA,
  ...
)

Arguments

• mapping: Set of aesthetic mappings created by ggplot2::aes()

  or ggplot2::aes_(). By default x, y, width and height are mapped to x, y, width and height in the node data.

• data: The data to be displayed in this layer. There are three options:

  If NULL, the default, the data is inherited from the plot data as specified in the call to ggplot().

  A data.frame, or other object, will override the plot data. All objects will be fortified to produce a data frame. See fortify() for which variables will be created.

  A function will be called with a single argument, the plot data. The return value must be a data.frame, and will be used as the layer data. A function can be created from a formula (e.g. ~ head(.x, 10)).

• position: Position adjustment, either as a string naming the adjustment (e.g. "jitter" to use position_jitter), or the result of a call to a position adjustment function. Use the latter if you need to change the settings of the adjustment.

• show.legend: logical. Should this layer be included in the legends? NA, the default, includes if any aesthetics are mapped. FALSE never includes, and TRUE always includes. It can also be a named logical vector to finely select the aesthetics to display.

• ...: Other arguments passed on to layer(). These are often aesthetics, used to set an aesthetic to a fixed value, like colour = "red" or size = 3. They may also be parameters to the paired geom/stat.

Aesthetics

geom_treemap understand the following aesthetics. Bold aesthetics are automatically set, but can be overwritten.

• x
• y
• width
• height
• alpha
• colour
• fill
• size
• stroke
• filter

Examples

# Create a graph of the flare class system
library(tidygraph)
flareGraph <- tbl_graph(flare$vertices, flare$edges) %>%
  mutate(
    class = map_bfs_chr(node_is_root(), .f = function(node, dist, path, ...) {
      if (dist <= 1) {
        return(shortName[node])
      }
      path$result[[nrow(path)]]
    })
  )

ggraph(flareGraph, 'treemap', weight = size) +
  geom_node_tile(aes(fill = class, filter = leaf, alpha = depth), colour = NA) +
  geom_node_tile(aes(linewidth = depth), colour = 'white') +
  scale_alpha(range = c(1, 0.5), guide = 'none') +
  scale_size(range = c(4, 0.2), guide = 'none')

See Also

Other geom_node_*: geom_node_arc_bar(), geom_node_circle(), geom_node_point(), geom_node_range(), geom_node_sf(), geom_node_text(), geom_node_voronoi()

Author(s)

Thomas Lin Pedersen