<[EMAIL PROTECTED]> wrote :
>Are there any possibilities to fill a polygon with a point pattern or
>with a symbol pattern like '+' oder '-' instead of shading lines?
In `spatstat' there is code for testing whether points belong to
a spatial region. The region can consist of any number of polygons,
and the polygons may have holes, etc.
While splancs has similar functionality, spatstat additionally allows regions
defined by a binary image (e.g. a digital approximation to a circle).
The code is available both as a function inside.owin(x,y,win)
and as a method for "[" for point pattern objects.
Example of "[":
library(spatstat)
data(demopat)
w <- demopat$window # an irregular polygonal window
plot(w)
g <- as.mask(w, dimyx=c(20,20)) # make a 20 x 20 grid
# enclosing the window
g <- as.mask(w, eps = 200) # or set absolute grid spacing 200
p <- ppp(raster.x(g), raster.y(g), window=w)
# convert to point pattern object
p <- p[, w] # clip points to window
plot(p)
plot(p, pch="+") # etc
To create a window object use owin() or as.owin().
Adrian Baddeley
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