Plot a PolySet as a map, using the correct aspect ratio.
plotMap (polys, xlim = NULL, ylim = NULL, projection = TRUE,
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, …)
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.
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.
PolyData consisting of the PolyProp
s used to create the plot.
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 plotLines
and
plotPolys
, it uses the aspect ratio supplied in the
projection
attribute of polys
. If this attribute is
missing, it attempts to use its projection
argument. In the
absence of both, it uses a default aspect ratio of 1:1. It clips
polys
to xlim
and ylim
before plotting.
The 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
,
plotPoints
,
thinPolys
,
thickenPolys
.
# NOT RUN {
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
plotMap(polys,xlim=c(-.5,1.5),ylim=c(-.5,1.5),density=0,projection=1)
par(oldpar)
})
# }
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