Draws a circle
Draws a circle or an arc-circle on the current graphic device
circle(x = 0, y = 0, r = 1, theta = c(0, 360), n = 100, ...)
x |
x coordinate for the center of the circle |
y |
y coordinate for the center of the circle |
r |
radius of the circle |
theta |
start and stop angle |
n |
number of points for polygon object |
... |
arguments passed to |
none
J.R. Lobry
par(mfrow = c(2, 2), mar = c(0,0,2,0))
setup <- function(){
plot.new()
plot.window(xlim = c(-1,1), ylim = c(-1,1), asp = 1)
}
setup()
circle(col = "lightblue")
title(main = "theta = c(0, 360)")
setup()
circle(col = "lightblue", theta = c(0, 270))
title(main = "theta = c(0, 270)")
setup()
circle(col = "lightblue", theta = c(-90, 180))
title(main = "theta = c(-90, 180)")
setup()
n <- 20
for(i in seq(0, 360, length = n)){
circle(col = "lightblue", theta = c(i, i+360/(2*n)))
}
title(main = "many thetas")Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.