R: Arcs based on radius and radians

geom_arc {ggforce} | R Documentation

## Arcs based on radius and radians

### Description

This set of stats and geoms makes it possible to draw circle segments based on a centre point, a radius and a start and end angle (in radians). These functions are intended for cartesian coordinate systems and makes it possible to create circular plot types without using the `coord_polar` coordinate system.

### Usage

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

    geom_arc(mapping = NULL, data = NULL, stat = "arc",
      position = "identity", n = 360, arrow = NULL, lineend = "butt",
      na.rm = FALSE, show.legend = NA, inherit.aes = TRUE, ...)

    stat_arc2(mapping = NULL, data = NULL, geom = "path_interpolate",
      position = "identity", na.rm = FALSE, show.legend = NA, n = 360,
      inherit.aes = TRUE, ...)

    geom_arc2(mapping = NULL, data = NULL, stat = "arc2",
      position = "identity", n = 360, arrow = NULL, lineend = "butt",
      na.rm = FALSE, show.legend = NA, inherit.aes = TRUE, ...)

    stat_arc0(mapping = NULL, data = NULL, geom = "arc0",
      position = "identity", na.rm = FALSE, show.legend = NA,
      inherit.aes = TRUE, ...)

    geom_arc0(mapping = NULL, data = NULL, stat = "arc0",
      position = "identity", ncp = 5, arrow = NULL, lineend = "butt",
      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), is combined with the default mapping at the top level of the plot. You only need to supply mapping if there isn't a mapping defined for the plot.
`data` | A data frame. If specified, overrides the default data frame defined at the top level of the plot.
`geom,` | stat Override the default connection between `geom_arc` and `stat_arc`.
`position` | Position adjustment, either as a string, or the result of a call to a position adjustment function.
`na.rm` | If `FALSE` (the default), removes missing values with a warning. If `TRUE` silently removes missing values.
`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.
`n` | the smoothness of the arc. Sets the number of points to use if the arc would cover a full circle
`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`. There are three types of arguments you can use here: Aesthetics: to set an aesthetic to a fixed value, like `color = "red"` or `size = 3.` Other arguments to the layer, for example you override the default `stat` associated with the layer. Other arguments passed on to the stat.
`stat` | The statistical transformation to use on the data for this layer, as a string.
`arrow` | specification for arrow heads, as created by arrow()
`lineend` | Line end style (round, butt, square)
`ncp` | the number of control points used to draw the arc with curveGrob. Determines how well the arc approximates a circle section

### Details

An arc is a segment of a line describing a circle. It is the fundamental visual element in donut charts where the length of the segment (and conversely the angular span of the segment) describes the proportion of an entety.

### Aesthetics

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

- x0

- y0

- r

- start

- end

- color

- size

- linetype

- alpha

- lineend

### Computed variables

x, y

  The start coordinates for the segment

xend, yend

  The end coordinates for the segment

curvature

  The curvature of the curveGrob to match a circle

### Author(s)

Thomas Lin Pedersen

### See Also

`geom_arc_bar` for drawing arcs with fill

### Examples

    # Lets make some data
    arcs <- data.frame(
      start = seq(0, 2*pi, length.out=11)[-11],
      end = seq(0, 2*pi, length.out=11)[-1],
      r = rep(1:2, 5)
    )

    # Behold the arcs
    ggplot() + geom_arc(aes(x0=0, y0=0, r=r, start=start, end=end,
                            linetype=factor(r)),
                        data=arcs)

[Package ggforce version 0.1.2 Index]