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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA
// Copyright (C) DIGITEO - 2012 - Allan CORNET
// 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 contourf(x, y, z, nv, style, strf, leg, rect, nax)
[nout, nin] = argn(0);
if nin == 0 then // demo
t = -%pi:0.1:%pi;
m = sin(t)' * cos(t);
contourf(t,t,m);
return;
end
if nin <= 0 then
x=1:10;
end
if nin <= 1 then
y=1:10;
end
if nin <= 2 then
z=rand(size(x,"*"), size(y,"*"));
end
if nin <= 3 then
zmin=min(z);
zmax=max(z);
nv = zmin + (1:10) * (zmax-zmin)/(11);
end
if nin <= 5 then
strf="021";
end
if nin <= 6 then
leg=" ";
end
if nin <= 7 then
rect=[0,0,1,1];
end
if nin <= 8 then
nax=[1,10,1,10];
end
if x==[] then
x=1:size(z,"r");
end
if y==[] then
y=1:size(z,"c");
end
if type(x) <> 1 then
error(999, msprintf(gettext("%s: Wrong type for input argument #%d: Real vector expected.\n"), "contourf", 1));
end
if type(y) <> 1 then
error(999, msprintf(gettext("%s: Wrong type for input argument #%d: Real vector expected.\n"), "contourf", 2));
end
if type(z) <> 1 then
error(999, msprintf(gettext("%s: Wrong type for input argument #%d: Real matrix expected.\n"), "contourf", 3));
end
if type(nv) <> 1 then
error(999, msprintf(gettext("%s: Wrong type for input argument #%d: Real matrix expected.\n"), "contourf", 4));
end
if type(strf) <> 10 then
error(999, msprintf(gettext("%s: Wrong type for input argument #%d: String expected.\n"), "contourf", 6));
end
if type(leg) <> 10 then
error(999, msprintf(gettext("%s: Wrong type for input argument #%d: String expected.\n"), "contourf", 7));
end
if type(rect) <> 1 then
error(999, msprintf(gettext("%s: Wrong type for input argument #%d: Real matrix expected.\n"), "contourf", 8));
end
if type(nax) <> 1 then
error(999, msprintf(gettext("%s: Wrong type for input argument #%d: Real matrix expected.\n"), "contourf", 9));
end
nvs=size(nv,"*") ;
if nvs==1 then
nvs=nv;
zmin=min(z);
zmax=max(z);
nv = zmin + (1:nvs)*(zmax-zmin)/(nvs+1);
end;
if nin <= 4 then
style = -1*ones(1, nvs);
end
if type(style) <> 1 then
error(999, msprintf(gettext("%s: Wrong type for input argument #%d: Real matrix expected.\n"), "contourf", 5));
end
if nin <= 7 then
rect=[min(x), min(y), max(x), max(y)];
end
if ~isvector(x) then
error(999, msprintf(gettext("%s: Wrong size for input argument #%d: Real vector expected.\n"), "contourf", 1));
end
if ~isvector(y) then
error(999, msprintf(gettext("%s: Wrong size for input argument #%d: Real vector expected.\n"), "contourf", 2));
end
if size(strf, "*") <> 1 then
error(999, msprintf(gettext("%s: Wrong size for input argument #%d: A string expected.\n"), "contourf", 6));
end
if size(leg, "*") <> 1 then
error(999, msprintf(gettext("%s: Wrong size for input argument #%d: A string expected.\n"), "contourf", 7));
end
nv1 = nv;
[mz,nz] = size(z);
minz = min(z);
maxz = max(z);
// Surround the matrix by a very low region to get closed contours, and
// replace any NaN with low numbers as well.
zz=[ %nan * ones(1,nz+2) + %nan;
%nan * ones(mz,1) + %nan, z, %nan * ones(mz,1) + %nan;
%nan * ones(1,nz+2) + %nan];
kk=find(isnan(zz(:)));
zz(kk)=minz-1e4*(maxz-minz)+zeros(kk);
xx = [2 * x(1) - x(2); x(:); 2 * x(mz) - x(mz - 1)];
yy = [2 * y(1) - y(2); y(:); 2 * y(nz) - y(nz - 1)];
// Internal call to get the contours
[x1,y1]=contour2di(xx,yy,zz,nv);
CS=[x1;y1];
// Find the indices of the curves in the c matrix, and get the
// area of closed curves in order to draw patches correctly.
ii = 1;
ncurves = 0;
I = [];
Area=[];
while (ii < size(CS,2)),
nl=CS(2,ii);
ncurves = ncurves + 1;
I(ncurves) = ii;
xp=CS(1,ii+(1:nl)); // First patch
yp=CS(2,ii+(1:nl));
Area(ncurves)=sum(diff(xp).*(yp(1:nl-1)+yp(2:nl))/2);
ii = ii + nl + 1;
end
lp=xget("lastpattern");
if size(nv,"*") > 1 // case where nv is a vector defining the level curve values
if size(nv,"*") > lp
error(msprintf(gettext("%s: Colormap too small"),"contourf"));
end
else
if nv > lp
error(msprintf(gettext("%s: Colormap too small"),"contourf"));
return ;
end
end
min_nv=min(nv);
max_nv=max(nv);
plot2d([min(xx);max(xx)],[min(yy);max(yy)],0,strf,leg,rect,nax);
// Plot patches in order of decreasing size. This makes sure that
// all the lev1es get drawn, not matter if we are going up a hill or
// down into a hole. When going down we shift levels though, you can
// tell whether we are going up or down by checking the sign of the
// area (since curves are oriented so that the high side is always
// the same side). Lowest curve is largest and encloses higher data
// always.
draw_min=1;
H=[];
[FA,IA]=gsort(abs(Area));
drawlater(); // postpon the drawing here
a=gca();
old_foreground = a.foreground;
pat=xget("pattern");
for jj=IA',
nl=CS(2,I(jj));
lev1=CS(1,I(jj));
if (lev1 ~= minz | draw_min) then
xp=CS(1,I(jj)+(1:nl));
yp=CS(2,I(jj)+(1:nl));
pat=size(find( nv <= lev1),"*");
xset("pattern",pat);
xfpoly(xp,yp)
end
end
if style(1)<>-1 then
contour2d(xx,yy,zz,nv,style,"000",leg,rect,nax);
end
a.foreground = old_foreground;
drawnow(); // draw all now!
endfunction
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