ngon {maptree} | R Documentation |
Draws a regular polygon at specified coordinates as an outline or shaded.
ngon (xydc, n=4, type=1)
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). |
type |
type=1 => interior filled, type=2 => edge, type=3 => both. |
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).
Invisible.
Denis White, white.denis@epa.gov
polygon
,
lines
,
map.key
,
map.groups
plot (c(0,1), c(0,1), type="n") ngon (c(.5, .5, 10, "blue"), n=3) apply (cbind (runif(8), runif(8), 6, 2), 1, ngon)