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## Copyright (C) 1998-2003 Joao Cardoso.
##
## This program 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 2 of the License, or (at your
## option) any later version.
##
## This program 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.
##
## This file is part of plplot_octave.
## [x, y, button] = ginput([n])
##
## gets n points (default 1e6) from the current axes and returns
## the x- and y-coordinates in length N vectors X and Y. The cursor
## can be positioned using a mouse (or by using the Arrow Keys on some
## systems). Data points are entered by pressing a mouse button
## or any key on the keyboard. A carriage return terminates the
## input before N points are entered.
##
## button contains a vector of integers specifying which mouse button was
## used (1,2,3 from left) or ASCII numbers if a key on the keyboard
## was used.
##
## A mouseclick or key press with the pointer positioned outside of
## the viewport is ignored.
##
## A bug makes the cross-hair remain in the plot after ginput terminates.
## To avoid, move the cross-hair outside the window, and press <RET>
## or issue plflush;pleop; after calling ginput
function [x, y, but] = ginput(n)
global __pl
__pl_init;
if (nargin == 0)
n = 1e6;
endif
keysym = 0;
i = 0;
while (i != n && keysym != 13)
[status, state, keysym, button, string, pX, pY, dX, dY, wX, wY] = plGetCursor;
if (button == 0 && length(string) == 0)
continue;
else
i++;
x(i) = wX;
y(i) = wY;
if (button == 0)
## Recommended replacement for the horrible misnomer (and deprecated in 4.4) toascii
## which contrary to its name converts ascii characters to the corresponding integers.
## But integers are stored as doubles in octave which is why double is a reasonable
## replacement for what toascii actually does.
but(i) = double(string(1));
else
but(i) = button;
endif
## should output appear at output?
## fprintf(stderr,"x=%f y=%f button=%d\n", x(i), y(i), but(i));
endif
endwhile
## if this is issued out of the function, in the *command line*,
## the cross-hair disappears!
plflush;pleop;
endfunction
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