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1 ## Copyright (C) 2014 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 {Command} {} zoom (@var{factor}) |
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21 ## @deftypefnx {Command} {} zoom out |
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22 ## @deftypefnx {Command} {} zoom reset |
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23 ## Zoom the current axes object. |
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24 ## |
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25 ## Given a numeric argument greater than zero, zoom by the given factor. |
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26 ## If the zoom factor is greater than one, zoom in on the plot. If the |
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27 ## factor is less than one, zoom out. |
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28 ## |
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29 ## Given the option @qcode{"out"}, zoom to the initial zoom setting. |
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30 ## |
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31 ## Given the option @qcode{"reset"}, set the initial zoom setting to the |
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32 ## current axes limits. |
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33 ## |
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34 ## @seealso{pan, rotate3d} |
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35 ## @end deftypefn |
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36 |
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37 ## Eventually we need to also support these features: |
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38 ## @deftypefn {Command} {} zoom |
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39 ## @deftypefnx {Command} {} zoom on |
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40 ## @deftypefnx {Command} {} zoom off |
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41 ## @deftypefnx {Command} {} zoom xon |
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42 ## @deftypefnx {Command} {} zoom yon |
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43 ## @deftypefnx {Command} {} zoom (@var{hfig}, @var{option}) |
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44 ## @deftypefnx {Command} {zoom_object_handle =} zoom (@var{hfig}) |
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45 |
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46 function zoom (varargin) |
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47 |
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48 hfig = NaN; |
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49 |
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50 nargs = nargin; |
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51 |
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52 if (nargs > 2) |
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53 print_usage (); |
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54 endif |
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55 |
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56 if (nargin == 1 && isfigure (varargin{1})) |
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57 error ("zoom_object_handle = zoom (hfig): not implemented"); |
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58 endif |
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59 |
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60 if (nargs == 2) |
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61 hfig = varargin{1}; |
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62 if (isfigure (hfig)) |
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63 varargin(1) = []; |
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64 nargs--; |
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65 else |
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66 error ("zoom: expecting figure handle as first argument"); |
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67 endif |
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68 endif |
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69 |
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70 if (isnan (hfig)) |
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71 hfig = gcf (); |
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72 endif |
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73 |
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74 if (nargs == 0) |
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75 error ("zoom: toggling zoom mode is not implemented"); |
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76 elseif (nargs == 1) |
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77 arg = varargin{1}; |
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78 if (isnumeric (arg)) |
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79 factor = arg; |
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80 if (factor < 0) |
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81 error ("zoom: factor must be greater than 1"); |
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82 elseif (factor == 1) |
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83 return; |
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84 endif |
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85 cax = get (hfig, "currentaxes"); |
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86 if (! isempty (cax)) |
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87 limits = axis (); |
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88 initial_zoom = getappdata (cax, "initial_zoom"); |
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89 if (isempty (initial_zoom)) |
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90 setappdata (cax, "__initial_zoom__", limits); |
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91 endif |
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92 axis (cax, limits / factor); |
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93 endif |
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94 elseif (ischar (arg)) |
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95 switch (arg) |
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96 case {"on", "off", "xon", "yon"} |
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97 error ("zoom %s: not implemented", arg); |
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98 |
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99 case "out" |
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100 cax = get (hfig, "currentaxes"); |
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101 if (! isempty (cax)) |
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102 initial_zoom = getappdata (cax, "__initial_zoom__"); |
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103 if (! isempty (initial_zoom)) |
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104 axis (cax, initial_zoom); |
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105 endif |
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106 endif |
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107 |
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108 case "reset" |
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109 cax = get (hfig, "currentaxes"); |
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110 if (! isempty (cax)) |
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111 setappdata (cax, "__initial_zoom__", axis ()); |
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112 endif |
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113 |
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114 otherwise |
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115 error ("zoom: unrecognized option '%s'", arg); |
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116 endswitch |
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117 else |
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118 error ("zoom: wrong type argument '%s'", class (arg)); |
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119 endif |
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120 endif |
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121 |
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122 endfunction |
