Plot a PolySet as polygons.
plotPolys (polys, xlim = NULL, ylim = NULL, projection = FALSE,
plt = c(0.11, 0.98, 0.12, 0.88), polyProps = NULL,
border = NULL, lty = NULL, col = NULL, colHoles = NULL,
density = NA, angle = NULL, bg = 0, axes = TRUE,
tckLab = TRUE, tck = 0.014, tckMinor = 0.5 * tck, ...)PolyData consisting of the PolyProps used to create the plot.
PolySet to plot (required).
range of X-coordinates.
range of Y-coordinates.
desired projection when PolySet lacks a
projection attribute; one of "LL", "UTM",
or a numeric value. If Boolean, specifies whether to check
polys for a projection attribute.
four element numeric vector (x1, x2, y1, y2) giving
the coordinates of the plot region measured as a fraction of the
figure region. Set to NULL if mai in par is
desired.
PolyData specifying which polygons to
plot and their properties. par parameters passed as
direct arguments supersede these data.
vector describing edge colours (cycled by PID).
vector describing line types (cycled by PID).
vector describing fill colours (cycled by PID).
vector describing hole colours (cycled by PID).
The default, NULL, should be used in most cases as it renders holes
transparent. colHoles is designed solely to eliminate retrace lines
when images are converted to PDF format. If colHoles is specified,
underlying information (i.e., previously plotted shapes) will be obliterated.
If NA is specified, only outer polygons are drawn, consequently filling holes.
vector describing shading line densities (lines per
inch, cycled by PID).
vector describing shading line angles (degrees, cycled by
PID).
background colour of the plot.
Boolean value; if TRUE, plot axes.
Boolean vector (length 1 or 2); if TRUE,
label the major tick marks. If given a two-element
vector, the first element describes the tick marks on the
x-axis and the second element describes those on the y-axis.
numeric vector (length 1 or 2) describing the length
of tick marks as a fraction of the smallest dimension. If
tckLab = TRUE, these tick marks will be automatically
labelled. If given a two-element vector, the first element
describes the tick marks on the x-axis and the second element
describes those on the y-axis.
numeric vector (length 1 or 2) describing the length of tick marks as a fraction of the smallest dimension. These tick marks can not be automatically labelled. If given a two-element vector, the first element describes the tick marks on the x-axis and the second element describes those on the y-axis.
additional par parameters, or the arguments
main, sub, xlab, or ylab for the
title function.
Nicholas M. Boers, Staff Software Engineer
Jobber, Edmonton AB
Last modified Rd: 2013-04-10
This function plots a PolySet, where each unique (PID,
SID) describes a polygon. It connects each polygon's last
vertex to its first. The function supports both borders
(border, lty) and fills (col, density,
angle). When supplied with the appropriate arguments, it can
draw only borders or only fills. Unlike plotMap, it
ignores the aspect ratio. It clips polys to xlim and
ylim before plotting.
This function creates a blank plot when polys equals
NULL. In this case, the user must supply both xlim and
ylim arguments. Alternatively, it accepts the argument
type = "n" as part of ..., which is equivalent to specifying
polys = NULL, but requires a PolySet. In both cases,
the function's behaviour changes slightly. To resemble the
plot function, it plots the border, labels, and other
parts according to par parameters such as col.
For additional help on the arguments border, lty,
col, density, and angle, please see
polygon and par.
addLabels,
addPolys,
addStipples,
clipPolys,
closePolys,
fixBound,
fixPOS,
locatePolys,
plotLines,
plotMap,
plotPoints,
thinPolys,
thickenPolys.
local(envir=.PBSmapEnv,expr={
oldpar = par(no.readonly=TRUE)
#--- create a PolySet to plot
polys <- data.frame(PID=rep(1,4),POS=1:4,X=c(0,1,1,0),Y=c(0,0,1,1))
#--- plot the PolySet
plotPolys(polys, xlim=c(-.5,1.5), ylim=c(-.5,1.5), density=0)
par(oldpar)
})
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