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annotate main/plot/view.m @ 0:6b33357c7561 octave-forge

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Initial revision
author pkienzle
date Wed, 10 Oct 2001 19:54:49 +0000
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children 34f9eb28a899
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1 ## Copyright (C) 1998 Ariel Tankus
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2 ##
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3 ## This program is free software.
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4 ## This file is part of the Image Processing Toolbox for Octave
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5 ##
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6 ## This program is free software; you can redistribute it and/or
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7 ## modify it under the terms of the GNU General Public License
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8 ## as published by the Free Software Foundation; either version 2
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9 ## of the License, or (at your option) any later version.
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10 ##
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11 ## This program is distributed in the hope that it will be useful,
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12 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 ## GNU General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with this program; if not, write to the Free Software
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18 ## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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19 ##
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20
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21 ## view Change the viewing angle for a 3-D plot.
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22 ##
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23 ## view(az, el)
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24 ## az - horizontal viewing angle (azimuth) [degrees].
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25 ## el - vertical viewing angle (elevation) [degrees].
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26 ##
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27
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28 ## Author: Ariel Tankus <arielt@math.tau.ac.il>
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29 ## Created: 14.8.98.
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30 ## Version: 1.0
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31
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32 function view(az, el)
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33
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34 ## azimuth is the same as rotation around the z-axis,
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35 ## so gnuplot's z_axis == az.
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36 az = rem(az, 360); # set az in range: [-360, 360].
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37 az = az + 360*(az < 0); # set az in range: [0, 360].
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38
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39 ## elevation: 0 deg - equator, 90 deg - north pole.
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40 ## in gnuplot: 0 deg - north pole, 90 deg - equator.
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41 rot_x = 90 - el;
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42
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43 ## elevation is in gnuplot coordinates
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44
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45 rot_x = rem(rot_x, 360); # set rot_x in range: [-360, 360].
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46 rot_x = rot_x + 360*(rot_x < 0); # set rot_x in range: [0, 360].
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47
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48 if (rot_x > 180)
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49 ## elevation greater than 180 degs is
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50 az = rem(az + 180, 360);
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51 rot_x = 360 - rot_x;
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52 end
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53
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54 gset('view', num2str(rot_x), ',', num2str(az));
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55 replot;
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56
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57 endfunction