geom_star: Star layer

In ggstar: Multiple Geometric Shape Point Layer for 'ggplot2'

Star layer

Description

geom_star provides the multiple geometric shape to create scatter plot or other point plot, it is like the 'geom_point' of 'ggplot2'. Note: the 'left-triangle' (17, 19) and 'right-triangle' (18, 20) are developed to plot the 'triangle-heatmap'. Their centers are not in their internal, but the center of hypotenuse.

Usage

geom_star(
  mapping = NULL,
  data = NULL,
  na.rm = FALSE,
  stat = "identity",
  position = "identity",
  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)).
na.rm	If 'FALSE', the default, missing values are removed with a warning. If 'TRUE', missing values are silently removed.
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 to 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.
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. To include legend keys for all levels, even when no data exists, use TRUE. If NA, all levels are shown in legend, but unobserved levels are omitted.
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. annotation_borders().
...	Other arguments passed on to layer.

Details

Aesthetics geom_star understands the following aesthetics. Required aesthetics are displayed in bold and defaults are displayed for optional aesthetics:

• x.

• y.

• starshape the shape of point, default is 1 (star shape).

• starstroke control the thickness of margin of point, default is 0.5.

• size the size of point, default is 1.5.

• colour the colour of margin, default is 'black'.

• fill the colour of fill, default is NA.

• alpha the transparency of fill, default is 1.

• angle control the angle of rotation of point, default is 0.

• subset subset the data frame which meet conditions to display.

Value

polygonal point layer

Author(s)

Shuangbin Xu

Examples

library(ggplot2)
p <- ggplot(iris, aes(x=Sepal.Length, 
                      y=Sepal.Width, 
                      starshape=Species)) + 
     geom_star(size=4)
p

ggstar documentation built on Nov. 5, 2025, 6:36 p.m.