I think this is a very useful function that I imagine has wide appeal -
thanks. Using the code below produces the plot OK but when I try and
copy/save it (as a metafile) I receive the following error and an hourglass:
Error: invalid graphics state
[using XP, 2.72, lattice 0.17.13]
Regards,
David
Deepayan Sarkar wrote:
>
> On 9/15/08, Waichler, Scott R <[EMAIL PROTECTED]> wrote:
>> When I use panel.contourplot() with filled color regions, the coloring
>> follows the stair-step edge of the underlying grid instead the smooth
>> contour lines themselves. How can I get the latter behavior? I would
>> guess there is a much simpler way than manually creating polygons with
>> contourLines(), especially since a contour interval/region can have
>> holes inside it (different contour intervals).
>
> Manually creating polygons with contourLines will not really help
> because (1) as you noted, there will be holes, and (2) contours that
> cross edges will be open. The only real solution is to color each
> rectangle individually, and that would be very inefficient in R code
> (grid does not have a C-level interface).
>
> The good news is that filled.contour() already does this efficiently,
> and you can use that through the gridBase package:
>
>
> panel.filledcontour <-
> function(x, y, z, subscripts,
> at,
> col.regions = cm.colors,
> col = col.regions(length(at) - 1),
> ...)
> {
> stopifnot(require("gridBase"))
> z <- matrix(z[subscripts],
> nrow = length(unique(x[subscripts])),
> ncol = length(unique(y[subscripts])))
> if (!is.double(z)) storage.mode(z) <- "double"
> opar <- par(no.readonly = TRUE)
> on.exit(par(opar))
> if (panel.number() > 1) par(new = TRUE)
> par(fig = gridFIG(), omi = c(0, 0, 0, 0), mai = c(0, 0, 0, 0))
> cpl <- current.panel.limits()
> plot.window(xlim = cpl$xlim, ylim = cpl$ylim,
> log = "", xaxs = "i", yaxs = "i")
> .Internal(filledcontour(as.double(do.breaks(cpl$xlim, nrow(z) - 1)),
> as.double(do.breaks(cpl$ylim, ncol(z) - 1)),
> z, as.double(at), col = col))
> }
>
> plot.new()
>
> levelplot(volcano, panel = panel.filledcontour,
> col.regions = terrain.colors,
> cuts = 25)
>
> -Deepayan
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>
>
-----
Institute for Transport Studies
University of Leeds
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