Last data update: 2014.03.03
R: Outline or Fill a Regular Polygon
Outline or Fill a Regular Polygon
Description
Draws a regular polygon at specified coordinates as an
outline or shaded.
Usage
ngon (xydc, n=4, angle=0, type=1)
Arguments
xydc
four element vector with x
and y
coordinates of center, d
diameter in mm, and
c
color.
n
number of sides for polygon (>8 => circle).
angle
rotation angle of figure, in degrees.
type
type=1
=> interior filled, type=2
=> edge,
type=3
=> both.
Details
Uses polygon
to draw shaded polygons and
lines
for outline. If n is odd, there is
a vertex at (0, d/2), otherwise the midpoint of a side is
at (0, d/2).
Value
Invisible.
Author(s)
Denis White
See Also
polygon
,
lines
,
map.key
,
map.groups
Examples
plot (c(0,1), c(0,1), type="n")
ngon (c(.5, .5, 10, "blue"), angle=30, n=3)
apply (cbind (runif(8), runif(8), 6, 2), 1, ngon)
Results