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########################################################################
##
## Copyright (C) 2008-2025 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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 3 of the License, 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, see
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{h} =} __clabel__ (@var{c}, @var{v}, @var{hparent}, @var{label_spacing}, @var{z}, @var{varargin})
## Undocumented internal function.
## @end deftypefn
function h = __clabel__ (c, v, hparent, label_spacing, z, varargin)
hax = ancestor (hparent, "axes");
units = get (hax, "units");
set (hax, "units", "points");
axpos = get (hax, "position");
set (hax, "units", units);
lims = axis ();
xspacing = axpos(3) / (lims(2) - lims (1));
yspacing = axpos(4) / (lims(4) - lims (3));
if (isscalar (hparent) && isgraphics (hparent, "hggroup"))
x = get (hparent, "xdata");
xmin = min (x(:));
xmax = max (x(:));
y = get (hparent, "ydata");
ymin = min (y(:));
ymax = max (y(:));
else
xmin = xmax = ymin = ymax = NaN;
i = 1;
while (i < length (c))
clen = c(2,i);
data = c(:, i+(1:clen));
xmin = min ([xmin, data(1,:)]);
xmax = max ([xmax, data(1,:)]);
ymin = min ([ymin, data(2,:)]);
ymax = max ([ymax, data(2,:)]);
i += clen+1;
endwhile
endif
## Decode contourc output format and place labels.
h = [];
i = 1;
while (i < length (c))
clev = c(1,i);
clen = c(2,i);
if (! isempty (v) && ! any (v == clev))
i += clen+1;
continue;
endif
p = bsxfun (@times, c(:, i+(1:clen)), [xspacing; yspacing]);
d = sqrt (sumsq (diff (p, 1, 2)));
cumd = cumsum (d);
td = cumd(end);
ntag = ceil (td / label_spacing);
if (all (c(:,i+1) == c(:,i+clen)))
## Closed contour
## FIXME: This spreads the tags uniformly around the contour which
## looks nice, but it does not respect the label_spacing attribute.
## Should we follow user input, which can result in two labels being
## quite close to each other?
spacing = td / ntag;
pos = spacing/2 + spacing*[0:ntag-1];
else
## Open contour
pos = zeros (1, ntag);
pos(1) = (td - label_spacing*(ntag - 1)) / 2;
pos(2:ntag) = pos(1) + label_spacing*[1:ntag-1];
endif
tlabel = sprintf ("%.5g", clev);
for tagpos = pos
j = find (cumd > tagpos, 1);
if (isempty (j))
j = clen;
endif
tpos = sum (c(:,i+j:i+j+1), 2) / 2;
if ( tpos(1) != xmin && tpos(1) != xmax
&& tpos(2) != ymin && tpos(2) != ymax)
trot = 180 / pi * atan2 (diff (c(2,i+j:i+j+1)) * yspacing,
diff (c(1,i+j:i+j+1)) * xspacing);
if (abs (trot) > 90)
trot += 180;
endif
if (ischar (z))
tpos = [tpos.' clev];
elseif (! isempty (z))
tpos = [tpos.' z];
else
tpos = [tpos.' 0];
endif
ht = __go_text__ (hparent, "position", tpos, "string", tlabel, ...
"rotation", trot, "clipping", "on", ...
"horizontalalignment", "center", ...
"userdata", clev, varargin{:});
h = [h; ht];
endif
endfor
i += clen+1;
endwhile
endfunction
## No test needed for internal helper function.
%!assert (1)
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