R: Circles based on center and radius

geom_circle {ggforce} | R Documentation

## Circles based on center and radius

### Description

This set of stats and geoms makes it possible to draw circles based on a center point and a radius. In contrast to using `ggplot2::geom_point()`, the size of the circles are related to the coordinate system and not to a separate scale. These functions are intended for cartesian coordinate systems and will only produce a true circle if `ggplot2::coord_fixed()` is used.

### Usage

    stat_circle(mapping = NULL, data = NULL, geom = "circle",
      position = "identity", n = 360, na.rm = FALSE, show.legend = NA,
      inherit.aes = TRUE, ...)

    geom_circle(mapping = NULL, data = NULL, stat = "circle",
      position = "identity", n = 360, expand = 0, radius = 0,
      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` | The number of points on the generated path per full circle.
`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.
`expand` | A numeric or unit vector of length one, specifying the expansion amount. Negative values will result in contraction instead. If the value is given as a numeric it will be understood as a proportion of the plot area width.
`radius` | As `expand` but specifying the corner radius.

### Aesthetics

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

- x0

- y0

- r

- color

- fill

- size

- linetype

- alpha

- lineend

### Computed variables

x, y

  The start coordinates for the segment

### Note

If the intend is to draw a bubble chart then use `ggplot2::geom_point()` and map a variable to the size scale

### See Also

`geom_arc_bar()` for drawing arcs with fill

### Examples

    # Lets make some data
    circles <- data.frame(
      x0 = rep(1:3, 3),
      y0 = rep(1:3, each = 3),
      r = seq(0.1, 1, length.out = 9)
    )

    # Behold the some circles
    ggplot() +
      geom_circle(aes(x0 = x0, y0 = y0, r = r, fill = r), data = circles)

    # Use coord_fixed to ensure true circularity
    ggplot() +
      geom_circle(aes(x0 = x0, y0 = y0, r = r, fill = r), data = circles) +
      coord_fixed()

[Package ggforce version 0.2.2 Index]