### Copyright (C) 1996 John W. Eaton
###
### This file is part of Octave.
###
### Octave is free software; you can redistribute it and/or modify it
### under the terms of the GNU General Public License as published by
### the Free Software Foundation; either version 2, or (at your option)
### any later version.
###
### Octave is distributed in the hope that it will be useful, but
### WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
### General Public License for more details.
###
### You should have received a copy of the GNU General Public License
### along with Octave; see the file COPYING.  If not, write to the Free
### Software Foundation, 59 Temple Place - Suite 330, Boston, MA
### 02111-1307, USA.

## Colormap.

function map = ocean (number)

  ## Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.

  if (nargin == 0)
    number = 64;
  elseif (nargin == 1)
    if (! is_scalar (number))
      error ("ocean: argument must be a scalar");
    endif
  else
    usage ("ocean (number)");
  endif

  cutin = fix (number/3);
  
  dr = (number - 1) / cutin;

  r = prepad ([0:dr:(number-1)], number)';

  dg = (number - 1) / (2 * cutin);

  g = prepad([0:dg:(number-1)], number)';

  b = [0:(number-1)]';

  map = [ r, g, b ] / (number - 1);

endfunction