On Mon, 11 Oct 2010, Karl Brand wrote:
Hi Paul,
That's pretty much awesome. Thank you very much.
And combined with the colorspace package functions- rainbow_hcl() and
sequential_hcl() -make color selection easy. One thing i was digging for was
a function that yields a color palette *and* the hcl() call needed to produce
it. This would help me better understand the hcl format. So where i can get
the RGB codes like this-
rainbow_hcl(4)
[1] "#E495A5" "#ABB065" "#39BEB1" "#ACA4E2"
- which is fine for color specification, is there a palette function that
might help obtain the hcl() call needed to produce a given palette? ie., the
'h', 'c' and 'l' (and 'alpha' if appropriate) values for a given
color/shade??
The ideas underlying rainbow_hcl(), sequential_hcl(), and diverge_hcl()
are described in the following paper
Achim Zeileis, Kurt Hornik, Paul Murrell (2009).
Escaping RGBland: Selecting Colors for Statistical Graphics.
Computational Statistics & Data Analysis, 53(9), 3259-3270.
doi:10.1016/j.csda.2008.11.033
A preprint PDF version of it is also available for download on my webpage.
In the paper you see how the HCL coordinates for the different palettes
are constructed. The functions rainbow_hcl(), sequential_hcl(), and
diverge_hcl() are all direct translations of this, consisting just of a
few lines of code.
What may be somewhat confusing is that the functions call
hex(polarLUV(L, C, H, ...))
instead of
hcl(H, C, L, ...)
which may yield slightly different results. The reason for this is that
the polarLUV() implementation in "colorspace" predates the base R
implementation in hcl().
hth,
Z
Thanks again and in advance for any further pointers,
Karl
On 10/10/2010 10:41 PM, Paul Murrell wrote:
Hi
On 11/10/2010 9:01 a.m., Karl Brand wrote:
Dear UseRs and DevelopeRs
It would be helpful to see the color palette available in the
venneuler() function.
The relevant par of ?venneuler states:
"colors: colors of the circles as values between 0 and 1"
-which explains color specification, but from what pallette? Short of
trial and error, i'd really appreciate if some one could help me locate
a "0 - 1" pallette for this function to aid with color selection.
The color spec stored in the VennDiagram object is multiplied by 360 to
give the "hue" component of an hcl() colour specification. For example,
0.5 would mean the colour hcl(0.5*360, 130, 60)
Alternatively, you can control the colours when you call plot, for
example, ...
plot(ve, col=c("red", "green", "blue"))
... should work.
Paul
FWIW, i tried the below code and received the displayed error. I failed
to turn up any solutions to this error...
Any suggestions appreciated,
Karl
library(venneuler)
ve<- venneuler(c("A"=1, "B"=2, "C"=3, "A&C"=0.5, "A&B&C"=0.1))
class(ve)
[1] "VennDiagram"
ve$colors<- c("red", "green", "blue")
plot(ve)
Error in col * 360 : non-numeric argument to binary operator
--
Karl Brand <k.br...@erasmusmc.nl>
Department of Genetics
Erasmus MC
Dr Molewaterplein 50
3015 GE Rotterdam
P +31 (0)10 704 3409 | F +31 (0)10 704 4743 | M +31 (0)642 777 268
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