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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.
## gtext(string [,just [,orient]])
##
## Place text on a 2-D graph using a mouse.
## gtext('string') displays the graph window, puts up a
## cross-hair, and waits for a mouse button or keyboard key to be
## pressed. The cross-hair can be positioned with the mouse (or
## with the arrow keys on some computers). Pressing a mouse button
## or any key writes the text string onto the graph at the selected
## location.
## just controls justification of text;
## just=0, left justified; just=1, right justified. In between values
## justify acordingly. Default, center justified.
## orient control orientation of text, measured in degrees. Default horizontal.
function gtext(string, just, orient)
if (nargin < 1 || nargin > 3)
help gtext
return
endif
__pl_init;
if (nargin == 1)
just = 0.5;
orient = 0;
endif
if (nargin == 2)
orient = 0;
endif
orient = orient*pi/180;
dx = cos(orient);
dy = sin(orient);
status = 0;
while (status == 0)
[status, state, key, but, st, pX, pY, dX, dY, wX, wY] = plGetCursor;
endwhile
## try to get world coordinates of a device point away (0.01, 0.01),
## to enable computing proper values of dx dy (orientation)
[st, dwx, dwy] = plTranslateCursor(dX+0.01, dY+0.01); # this may fail
xfact = (dwx - wX);
yfact = (dwy - wY);
plptex(wX, wY, dx*xfact, dy*yfact, just, string)
plflush;pleop;
endfunction
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