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image.m: Warn if input coordinates are not linearly spaced.
author Ben Abbott <bpabbott@mac.com>
date Fri, 02 Dec 2011 20:33:42 -0500
parents 536c6a5ab705
children e58963b5c0b1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1994-2011 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 3 of the License, or (at
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8 ## your option) 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, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} image (@var{img})
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21 ## @deftypefnx {Function File} {} image (@var{x}, @var{y}, @var{img})
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22 ## Display a matrix as a color image. The elements of @var{img} are indices
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23 ## into the current colormap, and the colormap will be scaled so that the
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24 ## extremes of @var{img} are mapped to the extremes of the colormap.
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25 ##
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26 ## The axis values corresponding to the matrix elements are specified in
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27 ## @var{x} and @var{y}. If you're not using gnuplot 4.2 or later, these
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28 ## variables are ignored.
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29 ##
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30 ## Implementation Note: The origin (0, 0) for images is located in the
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31 ## upper left. For ordinary plots, the origin is located in the lower
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32 ## left. Octave handles this inversion by plotting the data normally,
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33 ## and then reversing the direction of the y-axis by setting the
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34 ## @code{ydir} property to @code{"reverse"}. This has implications whenever
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35 ## an image and an ordinary plot need to be overlaid. The recommended
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36 ## solution is to display the image and then plot the reversed ydata
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37 ## using, for example, @code{flipud (ydata,1)}.
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38 ## @seealso{imshow, imagesc, colormap}
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39 ## @end deftypefn
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40
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41 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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42 ## Created: July 1994
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43 ## Adapted-By: jwe
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44
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45 function retval = image (varargin)
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46
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47 [ax, varargin, nargin] = __plt_get_axis_arg__ ("image", varargin{:});
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48
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49 firstnonnumeric = Inf;
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50 for i = 1 : nargin
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51 if (! isnumeric (varargin{i}))
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52 firstnonnumeric = i;
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53 break;
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54 endif
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55 endfor
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56
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57 if (nargin == 0 || firstnonnumeric == 1)
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58 img = imread ("default.img");
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59 x = y = [];
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60 elseif (nargin == 1 || firstnonnumeric == 2)
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61 img = varargin{1};
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62 x = y = [];
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63 elseif (nargin == 2 || firstnonnumeric == 3)
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64 print_usage ();
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65 else
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66 x = varargin{1};
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67 y = varargin{2};
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68 img = varargin{3};
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69 firstnonnumeric = 4;
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70 endif
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71
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72 oldax = gca ();
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73 unwind_protect
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74 axes (ax);
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75 h = __img__ (x, y, img, varargin {firstnonnumeric:end});
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76 set (ax, "layer", "top");
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77 unwind_protect_cleanup
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78 axes (oldax);
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79 end_unwind_protect
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80
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81 if (nargout > 0)
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82 retval = h;
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83 endif
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84
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85 endfunction
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86
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87 ## Generic image creation.
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88 ##
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89 ## The axis values corresponding to the matrix elements are specified in
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90 ## @var{x} and @var{y}. If you're not using gnuplot 4.2 or later, these
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91 ## variables are ignored.
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92
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93 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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94 ## Created: July 1994
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95 ## Adapted-By: jwe
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96
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97 function h = __img__ (x, y, img, varargin)
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98
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99 persistent warn = true
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100
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101 newplot ();
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102
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103 if (isempty (img))
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104 error ("__img__: matrix is empty");
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105 endif
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106
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107 if (isempty (x))
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108 x = [1, columns(img)];
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109 endif
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110
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111 if (isempty (y))
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112 y = [1, rows(img)];
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113 endif
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114
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115 xdata = [x(1), x(end)];
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116 ydata = [y(1), y(end)];
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117
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118 if ((numel (unique (diff (x))) > 1 || numel (unique (diff (y))) > 1) && warn)
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119 warning ("Image does not map to non-linearly spaced coordinates")
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120 warn = false;
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121 endif
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122
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123 ca = gca ();
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124
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125 tmp = __go_image__ (ca, "cdata", img, "xdata", xdata, "ydata", ydata,
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126 "cdatamapping", "direct", varargin {:});
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127
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128 px = __image_pixel_size__ (tmp);
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129
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130 if (xdata(2) < xdata(1))
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131 xdata = xdata(2:-1:1);
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132 elseif (xdata(2) == xdata(1))
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133 xdata = xdata(1) + [0, size(img,2)-1];
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134 endif
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135 if (ydata(2) < ydata(1))
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136 ydata = ydata(2:-1:1);
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137 elseif (ydata(2) == ydata(1))
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138 ydata = ydata(1) + [0, size(img,1)-1];
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139 endif
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140 xlim = xdata + [-px(1), px(1)];
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141 ylim = ydata + [-px(2), px(2)];
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142
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143 ## FIXME -- how can we do this and also get the {x,y}limmode
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144 ## properties to remain "auto"? I suppose this adjustment should
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145 ## happen automatically in axes::update_axis_limits instead of
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146 ## explicitly setting the values here. But then what information is
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147 ## available to axes::update_axis_limits to determine that the
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148 ## adjustment is necessary?
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149 set (ca, "xlim", xlim, "ylim", ylim);
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150
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151 if (ndims (img) == 3)
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152 if (isinteger (img))
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153 c = class (img);
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154 mn = intmin (c);
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155 mx = intmax (c);
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156 set (ca, "clim", double ([mn, mx]));
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157 endif
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158 endif
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159
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160 set (ca, "view", [0, 90]);
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161
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162 if (strcmp (get (ca, "nextplot"), "replace"))
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163 # Always reverse y-axis for images, unless hold is on
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164 set (ca, "ydir", "reverse");
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165 endif
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Rik <octave@nomad.inbox5.com>
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166
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167 if (nargout > 0)
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168 h = tmp;
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169 endif
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170
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171 endfunction
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172
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173 %!demo
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174 %! clf
11080
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175 %! img = 1 ./ hilb (11);
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176 %! x = -5:5;
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177 %! y = x;
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178 %! subplot (2,2,1)
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179 %! h = image (abs(x), abs(y), img);
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180 %! set (h, "cdatamapping", "scaled")
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181 %! ylabel ("limits = [4.5, 15.5]")
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182 %! title ('image (abs(x), abs(y), img)')
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183 %! subplot (2,2,2)
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184 %! h = image (-x, y, img);
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185 %! set (h, "cdatamapping", "scaled")
11080
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186 %! title ('image (-x, y, img)')
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187 %! subplot (2,2,3)
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Ben Abbott <bpabbott@mac.com>
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188 %! h = image (x, -y, img);
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Ben Abbott <bpabbott@mac.com>
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189 %! set (h, "cdatamapping", "scaled")
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Ben Abbott <bpabbott@mac.com>
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190 %! title ('image (x, -y, img)')
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Ben Abbott <bpabbott@mac.com>
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191 %! ylabel ("limits = [-5.5, 5.5]")
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192 %! subplot (2,2,4)
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Ben Abbott <bpabbott@mac.com>
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193 %! h = image (-x, -y, img);
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Ben Abbott <bpabbott@mac.com>
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194 %! set (h, "cdatamapping", "scaled")
36ceff79607b image.m: Allow x/ydata to imply a flip of the image. Modify demos.
Ben Abbott <bpabbott@mac.com>
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195 %! title ('image (-x, -y, img)')
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196
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197 %!demo
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198 %! clf
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199 %! g = 0.1:0.1:10;
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200 %! h = g'*g;
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201 %! imagesc (g, g, sin (h));
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202 %! hold on
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Ben Abbott <bpabbott@mac.com>
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203 %! imagesc (g, g+12, cos (h/2));
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Ben Abbott <bpabbott@mac.com>
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204 %! axis ([0 10 0 22])
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205 %! hold off
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Ben Abbott <bpabbott@mac.com>
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206 %! title ("two consecutive images")
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207
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208 %!demo
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Ben Abbott <bpabbott@mac.com>
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209 %! clf
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Ben Abbott <bpabbott@mac.com>
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210 %! g = 0.1:0.1:10;
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Ben Abbott <bpabbott@mac.com>
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211 %! h = g'*g;
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Ben Abbott <bpabbott@mac.com>
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212 %! imagesc (g, g, sin (h));
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Ben Abbott <bpabbott@mac.com>
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213 %! hold all
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Ben Abbott <bpabbott@mac.com>
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214 %! plot (g, 11.0 * ones (size (g)))
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Ben Abbott <bpabbott@mac.com>
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215 %! imagesc (g, g+12, cos (h/2));
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Ben Abbott <bpabbott@mac.com>
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216 %! axis ([0 10 0 22])
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Ben Abbott <bpabbott@mac.com>
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217 %! hold off
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Ben Abbott <bpabbott@mac.com>
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218 %! title ("image, line, image")
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219
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220 %!demo
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Ben Abbott <bpabbott@mac.com>
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221 %! clf
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Ben Abbott <bpabbott@mac.com>
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222 %! g = 0.1:0.1:10;
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Ben Abbott <bpabbott@mac.com>
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223 %! h = g'*g;
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Ben Abbott <bpabbott@mac.com>
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224 %! plot (g, 10.5 * ones (size (g)))
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Ben Abbott <bpabbott@mac.com>
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225 %! hold all
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Ben Abbott <bpabbott@mac.com>
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226 %! imagesc (g, g, sin (h));
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Ben Abbott <bpabbott@mac.com>
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227 %! plot (g, 11.0 * ones (size (g)))
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Ben Abbott <bpabbott@mac.com>
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228 %! imagesc (g, g+12, cos (h/2));
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Ben Abbott <bpabbott@mac.com>
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229 %! plot (g, 11.5 * ones (size (g)))
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Ben Abbott <bpabbott@mac.com>
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230 %! axis ([0 10 0 22])
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Ben Abbott <bpabbott@mac.com>
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231 %! hold off
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Ben Abbott <bpabbott@mac.com>
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diff changeset
232 %! title ("line, image, line, image, line")
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Ben Abbott <bpabbott@mac.com>
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diff changeset
233