arc: Add an arc to a plot

In alphahull: Generalization of the Convex Hull of a Sample of Points in the Plane

Add an arc to a plot

Description

This function adds the arc of B(c,r) between the angles that A_\theta v and A_{-\theta} v form with the axis OX, where A_\theta v represents the clockwise rotation of angle \theta of the vector v.

Usage

arc(c, r, v, theta, ...)

Arguments

c	Center c of the arc.
r	Radius r of the arc.
v	Vector v in the plane.
theta	Angle \theta (in radians).
...	Arguments to be passed to methods, such as graphical parameters (see par).

See Also

plot.ahull.

Examples

## Not run: 
# Plot of the circumference of radius 1
theta <- seq(0, 2*pi, length = 100)
r <- 1
plot(r*cos(theta), r*sin(theta), type = "l")
# Add in red the arc between pi/4 and 3*pi/4
arc(c(0,0), 1, c(0,1), pi/4, col = 2, lwd = 2)

## End(Not run)

alphahull documentation built on Oct. 30, 2026, 1:07 a.m.