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1 ## Copyright (C) 2005 John W. Eaton |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Built-in Function} {} ishold |
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22 ## Return 1 if the next line will be added to the current plot, or 0 if |
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23 ## the plot device will be cleared before drawing the next line. |
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24 ## @end deftypefn |
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25 |
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26 function retval = ishold () |
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27 |
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28 global __current_figure__; |
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29 global __hold_state__; |
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30 |
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31 if (isempty (__current_figure__)) |
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32 __current_figure__ = 1; |
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33 endif |
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34 |
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35 if (isempty (__hold_state__)) |
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36 __hold_state__ = false; |
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37 endif |
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38 |
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39 if (length (__hold_state__) < __current_figure__) |
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40 __hold_state__(__current_figure__) = false; |
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41 endif |
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42 |
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43 if (nargin == 0) |
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44 retval = __hold_state__(__current_figure__); |
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45 else |
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46 usage ("ishold ()"); |
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47 endif |
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48 |
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49 endfunction |
