panel.levelplot {lattice}  R Documentation 
This is the default panel function for levelplot
.
panel.levelplot(x, y, z, subscripts, at = pretty(z), shrink, labels = NULL, label.style = c("mixed", "flat", "align"), contour = FALSE, region = TRUE, col = add.line$col, lty = add.line$lty, lwd = add.line$lwd, cex = add.text$cex, font = add.text$font, fontfamily = add.text$fontfamily, fontface = add.text$fontface, col.text = add.text$col, ..., col.regions = regions$col, alpha.regions = regions$alpha) panel.contourplot(...)
x, y, z 
variables defining the plot 
subscripts 
integer vector indicating what subset of x , y and
z to draw

at 
numeric vector specifying breakpoints for change in colors 
shrink 
either a numeric vector of length 2 (meant to work as both x and y components), or a list with components x and y which are numeric vectors of length 2. This allows the rectangles to be scaled proportional to the zvalue. The specification can be made separately for widths (x) and heights (y). The elements of the length 2 numeric vector gives the minimum and maximum proportion of shrinkage (corresponding to min and max of z). 
labels 
contour labels 
label.style 
controls choice of how label positions are determined. 
contour 
logical, specifying whether contour lines should be drawn 
region 
logical, specifying whether intercontour regions should be filled with the appropriate color 
col, lty, lwd 
graphical parameters for contour lines 
cex, col.text, font, fontfamily, fontface 
graphical parameters for contour labels 
... 
extra parameters 
col.regions 
a vector of colors used if region=TRUE . Usually a subset of
the colors are used, the exact number being one more than the length
of at . These are chosen to be roughly equally spaced along
col.regions . In the unusual case when col.regions is
not longer than at , it is repeated to be as long as
necessary.

alpha.regions 
numeric scalar controlling transparency of facets 
The same function is used for both levelplot
and
contourplot
(which differ only in default values of some
arguments). panel.contourplot
is a simple wrapper to
panel.levelplot
.
When contour=TRUE
, the contourLines
function is used to
calculate the contour lines.
Deepayan Sarkar Deepayan.Sarkar@Rproject.org