drawcircle: add a circle to a plot

In gobbios/cfp: Christof's functions

add a circle to a plot

Description

draws a circle with vertical alignment at bottom

Usage

drawcircle(x, y, rad, npoints = 70, border = NA, ...)

Arguments

x	numeric, x location
y	numeric, y location
rad	numeric, radius
npoints	integer, number of points along the circumference
border	color for circumference, by default omitted (i.e. NA)
...	other graphical parameters, e.g. col

Value

adds to current plot

Examples

plot(0, 0, asp=1, xlim=c(-2,2), ylim=c(-2,2), "n")
# by radius
drawcircle(-2, -2, 2, col="red")
drawcircle(-2, -2, 1, col="blue")
drawcircle(-2, -2, 0.5, col="gold")
# by area
drawcircle(2, -2, sqrt(2*2*pi/pi), col="red")
drawcircle(2, -2, sqrt(2*1*pi/pi), col="blue")
drawcircle(2, -2, sqrt(2*0.5*pi/pi), col="gold")

gobbios/cfp documentation built on April 11, 2022, 2:22 a.m.