On 08/13/2011 04:34 AM, Mikhail Titov wrote:
Hello!
I’d like to have a continuous color bar on my lattice xyplot with colors lets say
from topo.colors such that it has ticks& labels at few specific points only.
Right now I use do.breaks& level.colors with somewhat large number of steps.
The problem is that color change point doesn’t necessary correspond to the value
I’d like to label. Since I have many color steps and I don’t need high precision I
generate labels like this
labels<- ifelse( sapply(at,function(x) any(abs(att-x)<.03)) , sprintf("depth= %s ft",
at), "")
, where `att` has mine points of interest on color scale bar and `at`
corresponds to color change points used with level.colors . It is a bit
inconvenient as I have to adjust threshold `.03`, number of color steps so that
it labels only adjacent color change point with my labels.
Q: Are there any ready to use functions that would generate some kind of
GRaphical OBject with continuous color scale bar/key with custom at/labels such
that it would work with `legend` argument of xyplot from lattice?
Hi Mikhail,
I think that color.legend in the plotrix package will do what you are
asking, but it is in base graphics, and may not work with lattice.
Jim
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