R: Draw the rectangles in a treemap

geom_node_tile {ggraph}

R Documentation

Draw the rectangles in a treemap

Description

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

Usage

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

Arguments

`mapping`	Set of aesthetic mappings created by `aes` or `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.
`position`	Position adjustment, either as a string, or the result of a call to a position adjustment function.
`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 `color = "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 overridden.

x
y
width
height
alpha
colour
fill
size
stroke
filter

Author(s)

Thomas Lin Pedersen

Examples

require(igraph)
gr <- graph_from_data_frame(flare$edges, vertices = flare$vertices)

ggraph(gr, 'treemap', weight = 'size') + geom_node_tile()

# We can color by modifying the graph
gr <- tree_apply(gr, function(node, parent, depth, tree) {
  if (depth == 1) {
    tree <- set_vertex_attr(tree, 'Class', node, V(tree)$shortName[node])
  } else if (depth > 1) {
    tree <- set_vertex_attr(tree, 'Class', node, V(tree)$Class[parent])
  }
  tree
})

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

[Package ggraph version 1.0.2 Index]