File: fgrayplot.sci

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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-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=x**2+y**2");
		fgrayplot(-1:0.1:1,-1:0.1:1,Surf);
		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