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1 ## Copyright (C) 1996, 1997 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 {Function File} {} imagesc (@var{A}) |
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22 ## @deftypefnx {Function File} {} imagesc (@var{x}, @var{y}, @var{A}) |
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23 ## @deftypefnx {Function File} {} imagesc (@dots{}, @var{zoom}) |
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24 ## @deftypefnx {Function File} {} imagesc (@dots{}, @var{limits}) |
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25 ## @deftypefnx {Function File} { @var{B} = } imagesc (@dots{}) |
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26 ## Display a scaled version of the matrix @var{A} as a color image. The |
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27 ## matrix is scaled so that its entries are indices into the current |
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28 ## colormap. The scaled matrix is returned. If @var{zoom} is omitted, a |
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29 ## comfortable size is chosen. If @var{limits} = [@var{lo}, @var{hi}] are |
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30 ## given, then that range maps into the full range of the colormap rather |
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31 ## than the minimum and maximum values of @var{A}. |
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32 ## |
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33 ## The axis values corresponding to the matrix elements are specified in |
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34 ## @var{x} and @var{y}, either as pairs giving the minimum and maximum |
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35 ## values for the respective axes, or as values for each row and column |
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36 ## of the matrix @var{A}. At present they are ignored. |
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37 ## @seealso{image, imshow} |
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38 ## @end deftypefn |
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39 |
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40 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
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41 ## Created: July 1994 |
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42 ## Adapted-By: jwe |
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43 |
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44 function ret = imagesc (x, y, A, zoom, limits) |
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45 |
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46 if (nargin < 1 || nargin > 5) |
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47 print_usage (); |
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48 elseif (nargin == 1) |
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49 A = x; |
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50 zoom = x = y = limits = []; |
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51 elseif (nargin == 2) |
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52 A = x; |
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53 zoom = y; |
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54 x = y = limits = []; |
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55 elseif (nargin == 3) |
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56 ## Assume imagesc(x,y,A) for compatibility. It |
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57 ## could also be imagesc(A,limits,zoom), but if A is |
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58 ## a 1x2 vector, this is equivalent to imagesc(x,y,A) |
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59 ## for scalar A so we won't try to guess. |
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60 zoom = limits = []; |
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61 elseif (nargin == 4) |
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62 limits = []; |
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63 endif |
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64 |
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65 ## correct for zoom, limits parameter order |
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66 if (length (zoom) == 2) |
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67 swap = limits; |
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68 limits = zoom; |
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69 zoom = swap; |
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70 endif |
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71 |
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72 ## use given limits or guess them from the matrix |
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73 if (length (limits) == 2 && limits(2) >= limits(1)) |
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74 minval = limits(1); |
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75 maxval = limits(2); |
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76 A(A < minval) = minval; |
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77 A(A > maxval) = maxval; |
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78 elseif (length (limits) == 0) |
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79 maxval = max (A(:)); |
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80 minval = min (A(:)); |
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81 else |
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82 error ("expected data limits to be [lo, hi]"); |
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83 endif |
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84 |
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85 ## scale the limits to the range of the colormap |
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86 if (maxval == minval) |
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87 B = ones (size (A)); |
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88 else |
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89 ## Rescale values to between 1 and length (colormap) inclusive. |
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90 B = round ((A - minval) / (maxval - minval) * (rows (colormap) - 1)) + 1; |
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91 endif |
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92 |
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93 ## display or return the image |
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94 if (nargout == 0) |
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95 image (x, y, B, zoom); |
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96 else |
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97 ret = B; |
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98 endif |
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99 |
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100 endfunction |
