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########################################################################
##
## Copyright (C) 2007-2024 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 {} {} fill (@var{x}, @var{y}, @var{c})
## @deftypefnx {} {} fill (@var{x1}, @var{y1}, @var{c1}, @var{x2}, @var{y2}, @var{c2})
## @deftypefnx {} {} fill (@dots{}, @var{prop}, @var{val})
## @deftypefnx {} {} fill (@var{hax}, @dots{})
## @deftypefnx {} {@var{h} =} fill (@dots{})
## Create one or more filled 2-D polygons.
##
## The inputs @var{x} and @var{y} are the coordinates of the polygon vertices.
## If the inputs are matrices then the rows represent different vertices and
## each column produces a different polygon. @code{fill} will close any open
## polygons before plotting.
##
## The input @var{c} determines the color of the polygon. The simplest form
## is a single color specification such as a @code{plot} format or an
## RGB-triple. In this case the polygon(s) will have one unique color. If
## @var{c} is a vector or matrix then the color data is first scaled using
## @code{caxis} and then indexed into the current colormap. A row vector will
## color each polygon (a column from matrices @var{x} and @var{y}) with a
## single computed color. A matrix @var{c} of the same size as @var{x} and
## @var{y} will compute the color of each vertex and then interpolate the face
## color between the vertices.
##
## Multiple property/value pairs for the underlying patch object may be
## specified, but they must appear in pairs. The full list of properties is
## documented at @ref{Patch Properties}.
##
## If the first argument @var{hax} is an axes handle, then plot into this axes,
## rather than the current axes returned by @code{gca}.
##
## The optional return value @var{h} is a vector of graphics handles to
## the created patch objects.
##
## Example: red square
##
## @example
## @group
## vertices = [0 0
## 1 0
## 1 1
## 0 1];
## fill (vertices(:,1), vertices(:,2), "r");
## axis ([-0.5 1.5, -0.5 1.5])
## axis equal
## @end group
## @end example
##
## @seealso{patch, fill3, caxis, colormap}
## @end deftypefn
function h = fill (varargin)
[hax, varargin] = __plt_get_axis_arg__ ("fill", varargin{:});
hlist = [];
iargs = __find_patches__ (varargin{:});
opts = {};
if (numel (varargin) > iargs(end) + 2)
opts = varargin(iargs(end)+3 : end);
endif
if (! all (cellfun (@(x) iscolorspec (x), varargin(iargs + 2))))
print_usage ();
endif
oldfig = [];
if (! isempty (hax))
oldfig = get (0, "currentfigure");
endif
unwind_protect
hax = newplot (hax);
old_nxtplt = get (hax, "nextplot");
if (! ishold ())
set (hax, "box", "on");
endif
unwind_protect
set (hax, "nextplot", "add");
for i = 1 : length (iargs)
x = varargin{iargs(i)};
y = varargin{iargs(i) + 1};
cdata = varargin{iargs(i) + 2};
if (! size_equal (x, y))
if (iscolumn (y) && rows (y) == rows (x))
y = repmat (y, [1, columns(x)]);
elseif (iscolumn (x) && rows (x) == rows (y))
x = repmat (x, [1, columns(y)]);
else
error ("fill: X and Y must have same number of rows");
endif
endif
if (isrow (x))
x = x(:);
endif
if (isrow (y))
y = y(:);
endif
if (ischar (cdata) || isequal (size (cdata), [1, 3]))
one_color = true;
else
one_color = false;
endif
## For Matlab compatibility, replicate cdata to match size of data
if (! one_color && iscolumn (cdata))
sz = size (x);
if (all (sz > 1))
cdata = repmat (cdata, [1, sz(2)]);
endif
endif
## For Matlab compatibility, return 1 patch object for each column
for j = 1 : columns (x)
if (one_color)
htmp = __patch__ (hax, x(:,j), y(:,j), cdata, opts{:});
else
htmp = __patch__ (hax, x(:,j), y(:,j), cdata(:,j), opts{:});
endif
hlist(end+1, 1) = htmp;
endfor
endfor
unwind_protect_cleanup
if (strcmp (old_nxtplt, "replace"))
set (hax, "nextplot", old_nxtplt);
endif
end_unwind_protect
unwind_protect_cleanup
if (! isempty (oldfig))
set (0, "currentfigure", oldfig);
endif
end_unwind_protect
if (nargout > 0)
h = hlist;
endif
endfunction
function iargs = __find_patches__ (varargin)
iargs = 1:3:nargin;
optidx = find (! cellfun (@isnumeric, varargin(iargs)), 1);
iargs(optidx:end) = [];
endfunction
function retval = iscolorspec (arg)
retval = false;
if (ischar (arg))
persistent colors = {"y", "yellow", "r", "red", "m", "magenta", ...
"c", "cyan", "g", "green", "b", "blue", ...
"w", "white", "k", "black"};
if (any (strcmpi (arg, colors)))
retval = true;
endif
elseif (isnumeric (arg))
## Assume any numeric argument is correctly formatted cdata.
## Let patch worry about the multiple different input formats.
retval = true;
endif
endfunction
%!demo
%! clf;
%! t1 = (1/16:1/8:1) * 2*pi;
%! t2 = ((1/16:1/8:1) + 1/32) * 2*pi;
%! x1 = sin (t1) - 0.8;
%! y1 = cos (t1);
%! x2 = sin (t2) + 0.8;
%! y2 = cos (t2);
%! h = fill (x1,y1,"r", x2,y2,"g");
%! title ({"fill() function"; "cdata specified with string"});
%!demo
%! clf;
%! t1 = (1/16:1/8:1) * 2*pi;
%! t2 = ((1/16:1/8:1) + 1/32) * 2*pi;
%! x1 = sin (t1) - 0.8;
%! y1 = cos (t1);
%! x2 = sin (t2) + 0.8;
%! y2 = cos (t2);
%! h = fill (x1,y1,1, x2,y2,2);
%! title ({"fill() function"; 'cdata = row vector produces FaceColor = "flat"'});
%!demo
%! clf;
%! x = [0 0
%! 1 0.5
%! 1 0.5
%! 0 0];
%! y = [0 0
%! 0 0
%! 1 0.5
%! 1 0.5];
%! c = [1 2 3 4]';
%! fill (x, y, [c c]);
%! title ({"fill() function"; 'cdata = column vector produces FaceColor = "interp"'});
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