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1 ## Copyright (C) 1999,2000 Kai Habel |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; if not, write to the Free Software |
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15 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 |
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17 ## -*- texinfo -*- |
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18 ## @deftypefn {Function File} {} flag (@var{n}) |
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19 ## Create color colormap. |
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20 ## (cycling through red, white, blue and black) |
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21 ## The argument @var{n} should be a scalar. If it |
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22 ## is omitted, the length of the current colormap or 64 is assumed. |
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23 ## @end deftypefn |
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24 ## @seealso{colormap} |
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25 |
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26 ## Author: Kai Habel <kai.habel@gmx.de> |
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27 |
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28 ## flag(number) gives a colormap consists of red, white, blue and black |
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29 ## changing with each index |
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30 |
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31 function map = flag (number) |
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32 |
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33 global __current_color_map__ |
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34 |
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35 if (nargin == 0) |
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36 if exist ("__current_color_map__") |
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37 number = rows (__current_color_map__); |
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38 else |
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39 number = 64; |
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40 endif |
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41 elseif (nargin == 1) |
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42 if (! is_scalar (number)) |
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43 error ("flag: argument must be a scalar"); |
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44 endif |
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45 else |
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46 usage ("flag (number)"); |
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47 endif |
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48 |
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49 p = [1, 0, 0; 1, 1, 1; 0, 0, 1; 0, 0, 0]; |
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50 if (rem(number,4) == 0) |
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51 map=kron (ones (number / 4, 1), p); |
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52 else |
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53 map=[kron(ones (fix (number / 4), 1), p); p(1:rem (number, 4), :)]; |
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54 endif |
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55 |
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56 endfunction |
