Draw a rose or rhodonea curve

This geom allows you to draw mathematical roses. A rose is a sinusoid plotted in polar coordinates.

stat_rose(mapping = NULL, data = NULL, geom = "rose",
  position = "identity", n_points = 360, na.rm = FALSE,
  show.legend = NA, inherit.aes = TRUE, ...)

geom_rose(mapping = NULL, data = NULL, stat = "rose",
  position = "identity", n_points = 360, na.rm = FALSE,
  show.legend = NA, inherit.aes = TRUE, ...)

Arguments

mapping	Set of aesthetic mappings created by aes() or 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.
geom	The geometric object to use display the data
position	Position adjustment, either as a string, or the result of a call to a position adjustment function.
n_points	The number of points to sample along the curve.
na.rm	If FALSE, the default, missing values are removed with a warning. If TRUE, missing values are silently removed.
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().
...	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.
stat	The statistical transformation to use on the data for this layer, as a string.

Details

the shape follows the following parameterized form

$$x = (cos(k\theta) + c)cos(\theta)$$ $$y = (cos(k\theta) + c)sin(\theta)$$

where

$$k = n / d$$

the rose will be a closed loop when k is rational. this can easily be achived by keeping n and d whole numbers. c is the internal offset parameter changing how much the flower spreads out.

Aesthetics

geom_arc understand the following aesthetics (required aesthetics are in bold):

- **n** - **d** - **c** - x0 - y0 - xscale - yscale - rotation - color - fill - size - linetype - alpha - lineend

Computed variables

x, y

The coordinates for the points along the rose curve

References

https://en.wikipedia.org/wiki/Rose_(mathematics)

Examples

ggplot() +
  geom_rose(aes(n = 2, d = 1, c = 0))

ggplot() +
  geom_rose(aes(n = 2, d = 8, c = 0))

ggplot() +
  geom_rose(aes(n = 5, d = 4, c = 4))

# Rescaling
ggplot() +
  geom_rose(aes(n = 5, d = 4, c = 4, xscale = 6, yscale = 2))

# Rotation
ggplot() +
  geom_rose(aes(n = 2, d = 1, c = 0, rotation = pi / 4))

# Multiple roses
ggplot() +
  geom_rose(aes(n = 5:1, d = 1:5, c = 0, x0 = 1:5 * 3))

ggplot() +
  geom_rose(aes(n = 5, d = 4, c = 4), fill = "white")