A method for plot. Plots the triangles of
a Delaunay triangulation of a set of points in the plane.
Usage
# S3 method for triang.list
plot(x, showrect = FALSE, add = FALSE,
xlab = "x", ylab = "y", main = "", asp = 1, ...)
Arguments
x
An object of class “triang.list” as produced by
triang.list().
showrect
Logical scalar; show the enclosing rectangle rw (see
deldir()) be plotted?
add
Logical scalar; should the plot of the triangles be added
to an existing plot?
xlab
Label for the x-axis.
ylab
Label for the y-axis.
main
A title for the plot (used only if add is FALSE).
asp
The aspect ratio of the plot; integer scalar or
NA. Set this argument equal to NA to allow the data
to determine the aspect ratio and hence to make the plot occupy the
complete plotting region in both x and y directions.
This is inadvisable; see the Warnings.
…
Arguments passed to polygon() which does the actual
plotting of the triangles.
Value
None. This function has the side effect of producing (or
adding to) a plot.
Warnings
The user is strongly advised not to set the value of
asp but rather to leave asp equal to its default
value of 1. Any other value distorts the tesselation
and destroys the perpendicular appearance of lines which are
indeed perpendicular. (And conversely can cause lines which
are not perpendicular to appear as if they are.)
The argument asp was added at the request of Zubin
Dowlaty.
# NOT RUN {set.seed(42)
x <- runif(20)
y <- runif(20)
d <- deldir(x,y)
ttt <- triang.list(d)
plot(ttt,border="red",showrect=TRUE)
sss <- tile.list(d)
plot(sss)
plot(ttt,add=TRUE,border="blue")
# }