Re: Explicit rgb colors [was Re: historysize]

[Robert H. <en...@no...>]

>    rgb(r,g,b)=int(r*65536)+int(g*256)+int(b)
>    r(gray)=int(2.**24*gray)/65536/256.
>    g(gray)=int(2.**24*gray)%65536/256/256.
>    b(gray)=int(2.**24*gray)%256/256.
>    set palette color model RGB functions r(gray),g(gray),b(gray)
>    set cbrange [0:2.**24-1]
>    unset colorbox
>    splot 'colour-data.txt' using 1:2:3:(log($4)) \
>        with points pointtype 6 pointsize variable lc("black"), \
>      '' using 1:2:3:(rgb($1,$2,$3)) \
>        with points pointtype 7 palette

Wow, that's pretty neat. I'm impressed.

> The point types are chosen to give hollow and filled circles 
> respectively on the x11 terminal. Unfortunately it does not seem to be 
> possible to have varying point sizes _and_ colours set independently of 
> the z value.

No, Ethan is right on this one. Something like:

splot 'tmp.txt' using 1:2:3:(log($4)):(rgb($1,$2,$3)) \
       with points pointtype 7 pointsize variable palette

works a treat.

If only gnuplot did a depth sort on the data before plotting it....

Rob
-- 
Robert Hart <en...@no...>
University of Nottingham


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