polycirc2: Computes the polygon coordinates of a circle sector

In pgirmess: Spatial Analysis and Data Mining for Field Ecologists

Computes the polygon coordinates of a circle sector

Description

Computes the polygon coordinates of a circle sector

Usage

polycirc2(radius = 1, center = c(0, 0), edges = 50, init = pi/2, angle = pi/2)

Arguments

radius	the circle radius
center	the centre coordinates (defaut to x=0, y=0)
edges	the circular outline of the sector is approximated by a polygon with this many edges
init	number (in radian) specifying the starting angle
angle	number (in radian) specifying the sector angle

Details

The matrix of coordinates obtained is intended to be passed to the function polygon

Value

A matrix of coordinates

See Also

polygon,polycirc, floating.pie

Examples

plot(c(-1,+1),c(-1,+1),type="n",asp=1)
polygon(polycirc2(),col="red")
polygon(polycirc2(init=pi,angle=pi/4),col="green")
polygon(polycirc2(init=1.5*pi,angle=pi/4),col="violet")
polygon(polycirc2(radius=0.5,center=c(0.5,1)),col="blue")

polycirc2(init=pi,angle=pi/4)

pgirmess documentation built on April 8, 2023, 1:12 a.m.