[Octave-bug-tracker] [bug #49017] drawing grid uses RGBA color syntax incompatible with gnuplot 4.4

[Rik]

Follow-up Comment #3, bug #49017 (project octave):

Okay, this makes sense then.  In __gnuplot_draw_axes__.m, do_linestyle_command
()


function [style, ltidx] = do_linestyle_command (obj, linecolor, idx,
                                                plot_stream, errbars = "")
  idx = idx + 8;
  style = {};
  ltidx = [];

  if (__gnuplot_has_feature__ ("linetype"))
    scommand = "linetype";
  else
    scommand = "style line";
  endif
  fprintf (plot_stream, "set %s %d default;\n", scommand, idx);
  fprintf (plot_stream, "set %s %d", scommand, idx);

  found_style = false;
  if (isnumeric (linecolor))
    color = linecolor;
    if (isfield (obj, "alpha"))
      alphastr = sprintf ("%02x", round (255*(1-obj.alpha)));
    else
      alphastr = "";
    endif
    fprintf (plot_stream, " linecolor rgb \"#%s%02x%02x%02x\"",
             alphastr, round (255*color));
  else
    color = [0, 0, 0];
  endif


I guess there should be a __gnuplot_has_feature__ test for whether the RGBA
syntax is accepted.  If it isn't then alphastr should be the null string.

Just guessing, something like


    if (isfield (obj, "alpha") && __gnuplot_has_feature__ ("RGBA"))
      alphastr = sprintf ("%02x", round (255*(1-obj.alpha)));
    else
      alphastr = "";
    endif


Dan will know about this.


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