R-alpha: Colors -- Comment: yes, great !!
Martin Maechler <email@example.com>
Thu, 7 Aug 1997 10:37:12 +0200
>>>>> "Ross" == Ross Ihaka <firstname.lastname@example.org> writes:
Ross> Here is a proposal: At present when you specify a color with an
Ross> integer it is taken as an index into a fixed table of 8 colors.
Ross> I would like to make the color table, user definable. To do this
Ross> there needs to be a function
Ross> palette(name, value)
Ross> where "name" could be used to select one on a number of standard
Ross> built-in palettes (e.g. "default", "heat", "terrain", "pastels"
Ross> etc) and (if name was not specified, "value" could be a character
Ross> vector of color specifications (of length less than or equal to
Ross> 256?). Either names (e.g. "red", "lightblue" ...) or by rgb
Ross> values (e.g "#FF00FF") could be used in the vector.
You could even do with one argument -- collapsing name & value.
character(1) -> 'name'
character(> 1) -> 'value'
But this may be just about the S practice
which has been in use in functions like diag(..) and
seems to confusing people..
Ross> The function palette would return the previous palette, and
Ross> palette() could be used to obtain the current settings without a
Ross> After a call to palette integer col= specification would provide
Ross> indexes into this table.
This sounds really great!
Just about what I may have dreamed when I sent my e-mail
a few weeks ago :-)
Ross> col=0 could be used to indicate the current background color.
Ross> The "default" palette would have 1=black.
Ross> Any comments? Ross
Yes: Sounds great!
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