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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution. The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
function []=fgrayplot(x,y,f,strf,rect,nax,void)
//[]=fgrayplot(x,y,f)
// Trace en niveau de gris une surface
// z=f(x,y) d\'efinie par un external f ( ex macro [y]=f(x))
// on calcule d'abord f sur la grille definie par x.y
// x et y sont des vecteurs implicites donnant les
// abscisses et les ordonn\'ees des points de la grille
// le niveau de gris choisi sur chaque maillage depend de la valeur
// moyenne de z dans le maillage.
// Exemple : taper fgrayplot() pour voir un exemple .
// deff('[z]=Surf(x,y)','z=x**2+y**2');
// fgrayplot(-1:0.1:1,-1:0.1:1,Surf);
//!
[lhs,rhs]=argn(0);
if rhs <= 0 then // demo
deff("[z]=Surf(x,y)","z=cos(x).^2+sin(y).^2");
fgrayplot(-%pi:0.1:%pi,-%pi:0.1:%pi, Surf);
f = gcf();
f.color_map = coolcolormap(100);
return
end
if rhs<3,
error(msprintf(gettext("%s: Wrong number of input argument(s): At least %d expected.\n"), "fgrayplot", 3));
end
opts=[]
if exists("style","local")==1 then opts=[opts,"style=style"],end
if exists("strf","local")==1 then opts=[opts,"strf=strf"],end
if exists("rect","local")==1 then opts=[opts,"rect=rect"],end
if exists("nax","local")==1 then opts=[opts,"nax=nax"],end
if exists("frameflag","local")==1 then opts=[opts,"frameflag=frameflag"],end
if exists("axesflag","local")==1 then opts=[opts,"axesflag=axesflag"],end
if type(f)==11 then comp(f),end;
execstr("grayplot(x,y,feval(x,y,f),"+strcat(opts,",")+")")
endfunction
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