On 24/08/2014 08:51, Jan Tosovsky wrote:
Dear All,
I am trying to create vector output (SVG) of filled contours.
I've found two approaches so far:
(1)
library('lattice')
svg("D:/test.svg")
filled.contour(volcano)
#levelplot(volcano, panel=panel.levelplot.raster) # panel.levelplot.raster
will make it raster
dev.off()
(2)
library("raster")
svg("D:/test.svg")
rr <- raster(t(volcano))
rc <- cut(rr, breaks= 10)
pols <- rasterToPolygons(rc, dissolve=T)
spplot(pols)
dev.off()
But I'd like to get smooth closed polygons not broken into small cells.
But the region between two contours is not in general a closed polygon.
Are there better methods in R ?
Neither of those are 'in R'!
So you need to define your terms, precisely. How can a polygon (with
piecewise linear boundaries) be 'smooth'?
But you could get a long way by looking at the following
?contourLines
?polygon
?grid::grid.polygon
all of which are part of R. R is a fully-fledged programming language
and you could write SVG directly from R: using the svg device is limited
by the steps to the R graphics primitives (see the 'R Internals' manual)
and cairographics.
Thanks, Jan
--
Brian D. Ripley, [email protected]
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK
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