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text.m: Add demo for text rotation and alignment.
author Ben Abbott <bpabbott@mac.com>
date Mon, 27 Dec 2010 11:13:06 -0500
parents 521f2bb7c443
children bc509d5f763f
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1 ## Copyright (C) 2007 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} {@var{h} =} text (@var{x}, @var{y}, @var{label})
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21 ## @deftypefnx {Function File} {@var{h} =} text (@var{x}, @var{y}, @var{z}, @var{label})
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22 ## @deftypefnx {Function File} {@var{h} =} text (@var{x}, @var{y}, @var{label}, @var{p1}, @var{v1}, @dots{})
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23 ## @deftypefnx {Function File} {@var{h} =} text (@var{x}, @var{y}, @var{z}, @var{label}, @var{p1}, @var{v1}, @dots{})
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24 ## Create a text object with text @var{label} at position @var{x},
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25 ## @var{y}, @var{z} on the current axes. Property-value pairs following
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26 ## @var{label} may be used to specify the appearance of the text.
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27 ## @end deftypefn
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28
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29 ## Author: jwe
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30
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31 function h = text (varargin)
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32
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33 nargs = nargin;
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34 offset = 0;
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35
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36 if (nargs > 2 && isnumeric (varargin{1}) && isnumeric (varargin{2}))
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37 x = varargin{1};
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38 y = varargin{2};
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39 offset = 3;
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40
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41 if (nargin > 3 && isnumeric (varargin{3}))
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42 z = varargin{3};
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43 offset = 4;
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44 else
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45 z = zeros (size (x));
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46 offset = 3;
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47 endif
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48
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49 label = varargin{offset};
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50 if (ischar (label) || iscellstr (label))
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51 varargin(1:offset) = [];
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52 if (ischar (label))
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53 label = cellstr (label);
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54 endif
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55 n = numel (label);
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56 nx = numel (x);
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57 ny = numel (y);
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58 nz = numel (z);
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59 else
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60 error ("text: expecting label to be a character string or cell array of character strings");
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61 endif
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62 else
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63 x = y = z = 0;
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64 nx = ny = nz = 1;
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65 label = {""};
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66 n = 1;
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67 endif
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68
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69 if (rem (numel (varargin), 2) == 0)
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70
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71 if (nx == ny && nx == nz)
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72 pos = [x(:), y(:), z(:)];
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73 ca = gca ();
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74 tmp = zeros (n, 1);
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75 if (n == 1)
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76 label = label{1};
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77 for i = 1:nx
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78 tmp(i) = __go_text__ (ca, "string", label,
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79 varargin{:},
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80 "position", pos(i,:));
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81 endfor
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82 __request_drawnow__ ();
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83 elseif (n == nx)
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84 for i = 1:nx
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85 tmp(i) = __go_text__ (ca, "string", label{i},
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86 varargin{:},
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87 "position", pos(i,:));
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88 endfor
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89 __request_drawnow__ ();
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90 else
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91 error ("text: dimension mismatch for coordinates and label");
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92 endif
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93 else
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94 error ("text: dimension mismatch for coordinates");
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95 endif
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96
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97 if (nargout > 0)
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98 h = tmp;
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99 endif
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100
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101 else
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102 print_usage ();
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103 endif
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104
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105 endfunction
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106
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107 %!demo
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108 %! clf
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109 %! ha = {"left", "center", "right"};
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110 %! va = {"bottom", "middle", "top"};
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111 %! for t = 0:30:359;
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112 %! for nh = 1:numel(ha)
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113 %! x = [0.25 0.5 0.75](nh);
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114 %! for nv = 1:numel(va)
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115 %! y = [0.25 0.5 0.75](nv);
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116 %! text (x, y, "Hello World",
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117 %! "rotation", t,
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118 %! "horizontalalignment", ha{nh},
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119 %! "verticalalignment", va{nv})
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120 %! endfor
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121 %! endfor
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122 %! endfor
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123 %! set (gca, "xtick", [0.25, 0.5, 0.75],
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124 %! "xticklabel", ha,
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125 %! "ytick", [0.25, 0.5, 0.75],
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126 %! "yticklabel", va)
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127 %! axis ([0 1 0 1])
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128 %! xlabel ("horizontal alignment")
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129 %! ylabel ("vertical alignment")
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130 %! title ("text alignment and rotation (0:30:360 degrees)")