Draw 2D/3D cubes with ggplot2

geom_oblicubes() creates a ggplot2 geom that draws cubes.

Usage

geom_oblicubes(
  mapping = NULL,
  data = NULL,
  stat = "identity",
  position = "identity",
  ...,
  angle = 45,
  scale = 0.5,
  xoffset = 0,
  yoffset = 0,
  zoffset = 0,
  light = darken_face,
  show.legend = NA,
  inherit.aes = TRUE
)

Arguments

mapping

Set of aesthetic mappings created by aes(). If specified and inherit.aes = TRUE (the default), it is combined with the default mapping at the top level of the plot. You must supply mapping if there is no plot mapping.

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)).

stat

The statistical transformation to use on the data for this layer. When using a geom_*() function to construct a layer, the stat argument can be used the override the default coupling between geoms and stats. The stat argument accepts the following:

A Stat ggproto subclass, for example StatCount.
A string naming the stat. To give the stat as a string, strip the function name of the stat_ prefix. For example, to use stat_count(), give the stat as "count".
For more information and other ways to specify the stat, see the layer stat documentation.

position

A position adjustment to use on the data for this layer. This can be used in various ways, including to prevent overplotting and improving the display. The position argument accepts the following:

The result of calling a position function, such as position_jitter(). This method allows for passing extra arguments to the position.
A string naming the position adjustment. To give the position as a string, strip the function name of the position_ prefix. For example, to use position_jitter(), give the position as "jitter".
For more information and other ways to specify the position, see the layer position documentation.

...

Aesthetics, used to set an aesthetic to a fixed value.

angle

Oblique projection angle.

scale

Oblique projection foreshortening factor. 0.5 corresponds to the “cabinet projection”. 1.0 corresponds to the “cavalier projection”. 0.0 corresponds to a “primary view orthographic projection”.

xoffset, yoffset, zoffset

By default the x,y,z values are assumed to be the center of the cube. Use xoffset, yoffset, and/or zoffset to shift the x,y,z values a fixed amount.

light

If FALSE don't perform a "light" effect. Otherwise a function that takes two arguments: the first face of the cube/cuboid face (one of "top", "west", "east", "south", "north"). the second col of the fill color. By default we use darken_face().

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.

inherit.aes

If FALSE, overrides the default aesthetics, rather than combining with them. This is most useful for helper functions that define both data and aesthetics and shouldn't inherit behaviour from the default plot specification, e.g. borders().

Value

A ggplot2 geom.

Details

geom_oblicubes() requires a fixed scale coordinate system with an aspect ratio of 1 as provided by ggplot2::coord_fixed().

Aesthetics

geom_oblicubes() understands the following aesthetics (required aesthetics are in bold). See oblicubesGrob() for more details.

x
y
z
fill
colour
linetype
linewidth

Examples

if (require("ggplot2")) {
  data("volcano", package = "datasets")
  df <- xyz_heightmap(volcano, scale = 0.3, min = 1)
  g <- ggplot(df, aes(x, y, z = z, fill = raw)) +
         geom_oblicubes(light = FALSE) +
         coord_fixed() +
         scale_fill_gradientn(name = "Height (m)",
                              colours=terrain.colors(256)) +
         labs(x = "East (10m)", y = "North (10m)",
              title = "Maungawhau (`datasets::volcano`)")
  plot(g)
}
#> Loading required package: ggplot2

# \donttest{
if (require("ggplot2")) {
  # Using `scale_fill_identity()` if using `xyz_heightmap()`'s `fill` column
  df <- xyz_heightmap(volcano, scale = 0.3, min = 1,
                      col = grDevices::heat.colors)
  g <- ggplot(df, aes(x, y, z = z, fill = fill)) +
         geom_oblicubes() +
         coord_fixed() +
         scale_fill_identity()
  plot(g)
}

# }
if (require("ggplot2") && require("dplyr")) {
  # Note you probably should not do 3D bar charts...
  df <- as.data.frame(datasets::Titanic) %>%
          filter(Age == "Child", Freq > 0) %>%
          group_by(Sex, Survived, Class) %>%
          summarize(Freq = seq.int(sum(Freq)), .groups = "drop")
  g <- ggplot(df, aes(x = Survived, y = Freq, fill = Survived)) +
      facet_grid(cols = vars(Class, Sex)) +
      coord_fixed() +
      geom_oblicubes(yoffset = -0.5, zoffset = -0.5, angle = -45, scale = 0.7) +
      scale_fill_manual(values = c("Yes" = "lightblue", "No" = "red")) +
      scale_y_continuous(expand = expansion(), name = "") +
      scale_x_discrete(name = "", breaks = NULL) +
      labs(title = "Children on the Titanic (by ticket class)")
  plot(g)
}
#> Loading required package: dplyr
#> 
#> Attaching package: ‘dplyr’
#> The following objects are masked from ‘package:stats’:
#> 
#>     filter, lag
#> The following objects are masked from ‘package:base’:
#> 
#>     intersect, setdiff, setequal, union
#> Warning: Returning more (or less) than 1 row per `summarise()` group was deprecated in
#> dplyr 1.1.0.
#> ℹ Please use `reframe()` instead.
#> ℹ When switching from `summarise()` to `reframe()`, remember that `reframe()`
#>   always returns an ungrouped data frame and adjust accordingly.