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## Copyright (C) 2010-2013 Shai Ayal
##
## 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
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{x}, @var{y}, @var{buttons}] =} __fltk_ginput__ (@var{f}, @var{n})
## Undocumented internal function.
## @end deftypefn
## This is ginput.m implementation for fltk.
function [x, y, button] = __fltk_ginput__ (f, n = -1)
if (isempty (get (f, "currentaxes")))
error ("ginput: must have at least one axes");
endif
x = y = button = [];
ginput_accumulator (0, 0, 0, 0); # initialize accumulator
unwind_protect
orig_windowbuttondownfcn = get (f, "windowbuttondownfcn");
set (f, "windowbuttondownfcn", @ginput_windowbuttondownfcn);
orig_ginput_keypressfcn = get (f, "keypressfcn");
set (f, "keypressfcn", @ginput_keypressfcn);
do
__fltk_redraw__ ();
## Release CPU.
sleep (0.01);
[x, y, n0, button] = ginput_accumulator (-1, 0, 0, 0);
until (n0 == n || n0 < 0)
unwind_protect_cleanup
set (f, "windowbuttondownfcn", orig_windowbuttondownfcn);
set (f, "keypressfcn", orig_ginput_keypressfcn);
end_unwind_protect
endfunction
function [x, y, n, button] = ginput_accumulator (mode, xn, yn, btn)
persistent x y n button;
if (mode == 0)
## Initialize.
x = y = button = [];
n = 0;
elseif (mode == 1)
## Append mouse button or key press.
x = [x; xn];
y = [y; yn];
button = [button; btn];
n += 1;
elseif (mode == 2)
## The end due to Enter.
n = -1;
endif
endfunction
function ginput_windowbuttondownfcn (src, data)
point = get (get (src,"currentaxes"), "currentpoint");
button = data;
ginput_accumulator (1, point(1,1), point(2,1), button);
endfunction
function ginput_keypressfcn (src, evt)
point = get (get (src, "currentaxes"), "currentpoint");
key = evt.Key;
if (key == 10)
## Enter key stops ginput.
ginput_accumulator (2, NaN, NaN, NaN);
else
ginput_accumulator (1, point(1,1), point(2,1), key);
endif
endfunction
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