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Groups > comp.graphics.apps.gnuplot > #1492

Re: Plot with boxes and rgb variable

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Sorry, since a while, Thunderbird (16.0.1, Ubuntu) labels "reply to
group" as "followup", and "reply" is e-mail only. Since then, I
repeatedly reply as mail rather than to the group. The TB developers
should really improve the intuitive handling of their GUI.

On 15.11.2012 05:10, sfeam wrote:

> That would work if the file contained hexadecimal numbers in standard
> C format:   0xFF0000  0x00FF00  0x0000FF.
> The '#' character makes it a string rather than a number.

My mistake was to assume that the string format is automatically
recognized by gnuplot as an RGB specifier. Is far as I could find in the
manual, there is no hint that standard C format has to be used here, and
this format has been replaced by the string format in terminal settings
some versions ago.

Meanwhile, I have modified the program that outputs the data so that it
now writes RGB triples rather than hexadecimals, so it works now.

> OK, so we have to convert the string to a number:
> 
>   # replace the leading '#' with '0x' and convert to integer
>   RGB(s) = int( "0x" . s[2:*] )
>   plot 'data' using 1:2:(RGB(strcol(3))) w boxes lc rgbcolor variable

Thanky, this might be useful for later. However, I am happy now with RGB
integer triples :-)

Best wishes,

Ingo

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Plot with boxes and rgb variable Ingo Thies <ingo.thies@gmx.de> - 2012-11-14 22:52 +0100
  Re: Plot with boxes and rgb variable sfeam <sfeam@users.sourceforge.net> - 2012-11-14 20:10 -0800
    Re: Plot with boxes and rgb variable Ingo Thies <ingo.thies@gmx.de> - 2012-11-15 11:43 +0100

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