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########################################################################
##
## Copyright (C) 2007-2026 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{hlist} =} __pie__ (caller, @dots{})
## Undocumented internal function.
## @end deftypefn
function hlist = __pie__ (caller, varargin)
h = varargin{1};
x = abs (varargin{2});
iarg = 3;
if (! isvector (x))
error ("%s: X must be a vector", caller);
endif
len = length (x);
have_explode = false;
have_labels = false;
while (iarg <= nargin - 1)
arg = varargin{iarg++};
if (iscell (arg))
labels = arg;
have_labels = true;
if (numel (x) != numel (labels))
error ("%s: mismatch in number of labels and data", caller);
endif
elseif (isnumeric (arg) || islogical (arg))
explode = arg;
have_explode = true;
if (! size_equal (x, explode))
error ("%s: mismatch in number of elements in explode and data",
caller);
endif
else
error ("%s: %s is invalid as an optional argument", caller, class (arg));
endif
endwhile
if (! have_explode)
explode = zeros (size (x));
endif
normalize = true;
if (sum (x(:)) < 1)
normalize = false;
endif
if (! have_labels)
if (normalize)
xp = round (100 * x ./ sum (x));
else
xp = round (100 * x);
endif
for i = 1:len
labels{i} = sprintf ("%d%%", xp(i));
endfor
endif
hlist = [];
refinement = 90;
phi = 0:refinement:360;
if (normalize)
xphi = cumsum (x / sum (x) * 360);
else
xphi = cumsum (x * 360);
endif
for i = 1:len
if (i == 1)
xn = 0 : 360 / refinement : xphi(i);
else
xn = xphi(i-1) : 360 / refinement : xphi(i);
endif
if (xn(end) != xphi(i))
xn = [xn, xphi(i)];
endif
xn2 = (xn(1) + xn(end)) / 2;
if (explode (i))
xoff = - 0.1 * sind (xn2);
yoff = 0.1 * cosd (xn2);
else
xoff = 0;
yoff = 0;
endif
xt = - 1.2 * sind (xn2);
yt = 1.2 * cosd (xn2);
if (len == 1)
set (h, "clim", [1, 2]);
else
set (h, "clim", [1, len]);
endif
if (strcmp (caller, "pie3"))
ln = length (xn);
zlvl = 0.35;
sx = repmat (xoff + [0, -sind(xn), 0], [2, 1]);
sy = repmat (yoff + [0, cosd(xn), 0], [2, 1]);
sz = [zeros(1, ln + 2); zlvl * ones(1, ln + 2)];
sc = i * ones (size (sz));
hlist = [hlist;
patch(h, xoff + [0, -sind(xn)], yoff + [0, cosd(xn)], zeros (1, ln + 1), i);
surface(h, sx, sy, sz, sc);
patch(h, xoff + [0, -sind(xn)], yoff + [0, cosd(xn)], zlvl * ones (1, ln + 1), i);
text(h, xt, yt, zlvl, labels{i})];
elseif (strcmp (caller, "pie"))
if (xt > 0)
align = "left";
elseif (xt < 0)
align = "right";
else
align = "center";
endif
hlist = [hlist; patch(h, xoff + [0, -sind(xn)], yoff + [0, cosd(xn)], i);
text(h, xt, yt, labels{i}, "horizontalalignment", align)];
else
error ("__pie__: unknown caller '%s'", caller);
endif
endfor
addlistener (h, "view", {@update_text_pos, hlist});
if (strcmp (caller, "pie3"))
axis (h, [-1.25, 1.25, -1.25, 1.25, -0.05, 0.4], "equal", "off");
view (h, -37.5, 30);
elseif (strcmp (caller, "pie"))
axis (h, [-1.5, 1.5, -1.5, 1.5], "square", "off");
endif
endfunction
function update_text_pos (~, ~, all_handles)
## Text objects in the foreground should be at the base level.
## Text objects in the background should be at the top level.
## Text objects on the right side should be aligned to the right
## and on the left side to the left.
tobj = findobj (all_handles, "type", "text");
## check if we are called from pie3
s = findobj (all_handles, "type", "surface");
is_pie3 = false;
if (length (s) > 0)
is_pie3 = true;
endif
if (length (tobj) > 0)
ax = get (tobj(1), "parent");
azel = get (ax, "view");
pos = get (tobj, "position");
if (iscell (pos))
pos = cell2mat (pos);
endif
phi = atand (pos(:,1) ./ pos(:,2));
[theta, r] = cart2pol (pos(:,1), pos(:,2));
theta *= 180/pi;
theta -= azel(1);
theta = mod (theta, 360);
ud_mask = (theta > 180);
lr_mask = (theta > 90) & (theta < 270);
for i = 1 : length (tobj)
if (is_pie3)
if (ud_mask(i))
set (tobj(i), "position", [pos(i,1), pos(i,2), -0.05]);
else
set (tobj(i), "position", [pos(i,1), pos(i,2), 0.40]);
endif
endif
if (lr_mask(i))
set (tobj(i), "horizontalalignment", "right");
else
set (tobj(i), "horizontalalignment", "left");
endif
endfor
endif
endfunction
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