plot.owin

0th

Percentile

Plot a Spatial Window

Plot a two-dimensional window of observation for a spatial point pattern

Keywords
hplot, spatial
Usage
"plot"(x, main, add=FALSE, ..., box, edge=0.04, type=c("w","n"), show.all=!add,  hatch=FALSE, hatchargs=list(),  invert=FALSE, do.plot=TRUE, claim.title.space=FALSE)
Arguments
x
The window to be plotted. An object of class owin, or data which can be converted into this format by as.owin().
main
text to be displayed as a title above the plot.
logical flag: if TRUE, draw the window in the current plot; if FALSE, generate a new plot.
...
extra arguments passed to the generic plot function.
box
logical flag; if TRUE, plot the enclosing rectangular box
edge
nonnegative number; the plotting region will have coordinate limits that are 1 + edge times as large as the limits of the rectangular box that encloses the pattern.
type
Type of plot: either "w" or "n". If type="w" (the default), the window is plotted. If type="n" and add=TRUE, a new plot is initialised and the coordinate system is established, but nothing is drawn.
show.all
Logical value indicating whether to plot everything including the main title.
hatch
logical flag; if TRUE, the interior of the window will be shaded by texture, such as a grid of parallel lines.
hatchargs
List of arguments passed to add.texture to control the texture shading when hatch=TRUE.
invert
logical flag; when the window is a binary pixel mask, the mask colours will be inverted if invert=TRUE.
do.plot
Logical value indicating whether to actually perform the plot.
claim.title.space
Logical value indicating whether extra space for the main title should be allocated when declaring the plot dimensions. Should be set to FALSE under normal conditions.
Details

This is the plot method for the class owin. The action is to plot the boundary of the window on the current plot device, using equal scales on the x and y axes.

If the window x is of type "rectangle" or "polygonal", the boundary of the window is plotted as a polygon or series of polygons. If x is of type "mask" the discrete raster approximation of the window is displayed as a binary image (white inside the window, black outside).

Graphical parameters controlling the display (e.g. setting the colours) may be passed directly via the ... arguments, or indirectly reset using spatstat.options.

When x is of type "rectangle" or "polygonal", it is plotted by the R function polygon. To control the appearance (colour, fill density, line density etc) of the polygon plot, determine the required argument of polygon and pass it through ... For example, to paint the interior of the polygon in red, use the argument col="red". To draw the polygon edges in green, use border="green". To suppress the drawing of polygon edges, use border=NA.

When x is of type "mask", it is plotted by image.default. The appearance of the image plot can be controlled by passing arguments to image.default through .... The default appearance can also be changed by setting the parameter par.binary of spatstat.options.

To zoom in (to view only a subset of the window at higher magnification), use the graphical arguments xlim and ylim to specify the desired rectangular field of view. (The actual field of view may be larger, depending on the graphics device).

none.

Notes on Filled Polygons with Holes

The function polygon can only handle polygons without holes. To plot polygons with holes in a solid colour, we have implemented two workarounds.

owin.object, plot.ppp, polygon, image.default, spatstat.options

• plot.owin
Examples
  # rectangular window
plot(Window(nztrees))
abline(v=148, lty=2)

# polygonal window
w <- Window(demopat)
plot(w)
plot(w, col="red", border="green", lwd=2)
plot(w, hatch=TRUE, lwd=2)