geom_arc | R Documentation |
This set of stats and geoms makes it possible to draw circle segments based
on a center 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
ggplot2::coord_polar()
coordinate system.
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,
...
)
mapping |
Set of aesthetic mappings created by |
data |
The data to be displayed in this layer. There are three options: If A A |
geom |
The geometric object to use to display the data, either as a
|
position |
Position adjustment, either as a string naming the adjustment
(e.g. |
na.rm |
If |
show.legend |
logical. Should this layer be included in the legends?
|
n |
the smoothness of the arc. Sets the number of points to use if the arc would cover a full circle |
inherit.aes |
If |
... |
Other arguments passed on to |
stat |
The statistical transformation to use on the data for this
layer, either as a |
arrow |
Arrow specification, as created by |
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 |
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.
geom_arc understand the following aesthetics (required aesthetics are in bold):
x0
y0
r
start
end
color
linewidth
linetype
alpha
lineend
The start coordinates for the segment
The end coordinates for the segment
The curvature of the curveGrob to match a circle
geom_arc_bar()
for drawing arcs with fill
# 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(arcs) +
geom_arc(aes(x0 = 0, y0 = 0, r = r, start = start, end = end,
linetype = factor(r)))
# Use the calculated index to map values to position on the arc
ggplot(arcs) +
geom_arc(aes(x0 = 0, y0 = 0, r = r, start = start, end = end,
size = after_stat(index)), lineend = 'round')
# The 0 version maps directly to curveGrob instead of calculating the points
# itself
ggplot(arcs) +
geom_arc0(aes(x0 = 0, y0 = 0, r = r, start = start, end = end,
linetype = factor(r)))
# The 2 version allows interpolation of aesthetics between the start and end
# points
arcs2 <- data.frame(
angle = c(arcs$start, arcs$end),
r = rep(arcs$r, 2),
group = rep(1:10, 2),
colour = sample(letters[1:5], 20, TRUE)
)
ggplot(arcs2) +
geom_arc2(aes(x0 = 0, y0 = 0, r = r, end = angle, group = group,
colour = colour), size = 2)
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