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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.
## [x1, y1, x2, y2] = plrb(clear)
##
## Interactively draws a rectangle using the mouse.
##
## Use mouse button-1 click/drag to grow or shrink the rectangle.
## Restart the selection with a button-2 click, and finish with button-3.
##
## If 'clear' is different from zero, the selection is cleared on exit.
function [x1, y1, x2, y2] = plrb(fg)
global __pl
__pl_init;
[status, state, keysym, button, string, pX, pY, dX, dY, wX, wY, subwin] = plGetCursor;
x1 = x2 = wX; y1 = y2 = wY;
x = [x1; x2; x2; x1; x1]; y = [y1; y1; y2; y2; y1 ];
hasxor = plxormod(1);
if (! hasxor )
warning("plrb: Device is not xor capable. Selection rectangle not drawn.");
endif
start = 1;
done = 0;
while(!done)
[status, state, keysym, button, string, pX, pY, dX, dY, wX, wY, subwin] = plGetCursor;
if (start)
if (hasxor)
plline(x,y);
plflush;
endif
start = 0;
elseif (state != 0)
if (hasxor)
plline(x,y);
x2 = wX; y2 = wY;
x = [x1; x2; x2; x1; x1]; y = [y1; y1; y2; y2; y1 ];
plline(x,y);
else
x2 = wX; y2 = wY;
x = [x1; x2; x2; x1; x1]; y = [y1; y1; y2; y2; y1 ];
endif
endif
st = fix(state/255);
if (st == 0 && button == 3) ## exit
if (nargin != 0 && fg && hasxor)
plline(x,y); plflush;
endif
plxormod(0);
break;
elseif (st == 0 && button == 2) ## restart
if (hasxor)
plline(x,y);
endif
[status, state, keysym, button, string, pX, pY, dX, dY, wX, wY, subwin] = plGetCursor;
x1 = x2 = wX; y1 = y2 = wY;
x = [x1; x2; x2; x1; x1]; y = [y1; y1; y2; y2; y1 ];
start = 1;
endif
endwhile
endfunction
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