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1 ## Copyright (C) 1996, 1997, 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 ## Undocumented internal function. |
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20 |
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21 ## Author: jwe |
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22 |
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23 function varargout = __bar__ (vertical, func, varargin) |
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24 |
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25 [h, varargin] = __plt_get_axis_arg__ ((nargout > 1), func, varargin{:}); |
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26 |
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27 ## Slightly smaller than 0.8 to avoid clipping issue in gnuplot 4.0 |
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28 width = 0.8 - 10 * eps; |
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29 group = true; |
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30 bv = 0; |
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31 |
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32 if (nargin < 3) |
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33 print_usage (); |
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34 endif |
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35 |
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36 if (nargin > 3 && isnumeric (varargin{2})) |
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37 x = varargin{1}; |
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38 if (isvector (x)) |
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39 x = x(:); |
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40 endif |
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41 y = varargin{2}; |
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42 if (isvector (y)) |
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43 y = y(:); |
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44 endif |
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45 if (size (x, 1) != size (y, 1)) |
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46 y = varargin{1}; |
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47 if (isvector (y)) |
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48 y = y(:); |
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49 endif |
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50 x = [1:size(y,1)]'; |
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51 idx = 2; |
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52 else |
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53 if (! isvector (x)) |
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54 error ("%s: x must be a vector", func); |
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55 endif |
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56 idx = 3; |
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57 endif |
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58 else |
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59 y = varargin{1}; |
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60 if (isvector (y)) |
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61 y = y(:); |
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62 endif |
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63 x = [1:size(y,1)]'; |
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64 idx = 2; |
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65 endif |
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66 |
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67 newargs = {}; |
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68 have_line_spec = false; |
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69 while (idx <= nargin - 2) |
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70 if (isstr (varargin{idx}) && strcmp (varargin{idx}, "grouped")) |
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71 group = true; |
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72 idx++; |
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73 elseif (isstr (varargin{idx}) && strcmp (varargin{idx}, "stacked")) |
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74 group = false; |
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75 idx++; |
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76 else |
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77 if ((isstr (varargin{idx}) || iscell (varargin{idx})) |
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78 && ! have_line_spec) |
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79 [linespec, valid] = __pltopt__ (func, varargin{idx}, false); |
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80 if (valid) |
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81 have_line_spec = true; |
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82 newargs = [{linespec.color}, newargs]; |
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83 idx++; |
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84 continue; |
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85 endif |
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86 endif |
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87 if (isscalar(varargin{idx})) |
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88 width = varargin{idx++}; |
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89 elseif (idx == nargin - 2) |
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90 newargs = [newargs,varargin(idx++)]; |
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91 elseif (isstr (varargin{idx}) && strcmp (tolower (varargin{idx}), "basevalue") && |
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92 isscalar (varargin{idx+1})) |
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93 bv = varargin{idx+1}; |
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94 idx += 2; |
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95 else |
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96 newargs = [newargs,varargin(idx:idx+1)]; |
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97 idx += 2; |
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98 endif |
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99 endif |
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100 endwhile |
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101 |
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102 xlen = size (x, 1); |
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103 ylen = size (y, 1); |
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104 |
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105 if (xlen != ylen) |
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106 error ("%s: length of x and y must be equal", func) |
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107 endif |
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108 if (any (x(2:end) < x(1:end-1))) |
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109 error ("%s: x vector values must be in ascending order", func); |
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110 endif |
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111 |
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112 ycols = size (y, 2); |
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113 if (group) |
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114 width = width / ycols; |
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115 endif |
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116 |
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117 cutoff = min (diff (double(x))) / 2; |
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118 delta_p = delta_m = repmat (cutoff * width, size (x)); |
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119 x1 = (x - delta_m)(:)'; |
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120 x2 = (x + delta_p)(:)'; |
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121 xb = repmat ([x1; x1; x2; x2](:), 1, ycols); |
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122 |
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123 if (group) |
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124 width = width / ycols; |
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125 offset = ((delta_p + delta_m) * [-(ycols - 1) / 2 : (ycols - 1) / 2]); |
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126 xb(1:4:4*ylen,:) += offset; |
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127 xb(2:4:4*ylen,:) += offset; |
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128 xb(3:4:4*ylen,:) += offset; |
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129 xb(4:4:4*ylen,:) += offset; |
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130 y0 = zeros (size (y)) + bv; |
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131 y1 = y; |
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132 else |
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133 y1 = cumsum(y,2); |
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134 y0 = [zeros(ylen,1)+bv, y1(:,1:end-1)]; |
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135 endif |
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136 |
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137 yb = zeros (4*ylen, ycols); |
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138 yb(1:4:4*ylen,:) = y0; |
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139 yb(2:4:4*ylen,:) = y1; |
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140 yb(3:4:4*ylen,:) = y1; |
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141 yb(4:4:4*ylen,:) = y0; |
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142 |
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143 xb = reshape (xb, [4, numel(xb) / 4 / ycols, ycols]); |
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144 yb = reshape (yb, [4, numel(yb) / 4 / ycols, ycols]); |
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145 |
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146 if (nargout < 2) |
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147 oldh = gca (); |
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148 unwind_protect |
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149 axes (h); |
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150 newplot (); |
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151 |
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152 tmp = __bars__ (h, vertical, x, y, xb, yb, width, group, |
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153 have_line_spec, bv, newargs{:}); |
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154 if (nargout == 1) |
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155 varargout{1} = tmp; |
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156 endif |
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157 unwind_protect_cleanup |
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158 axes (oldh); |
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159 end_unwind_protect |
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160 else |
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161 if (vertical) |
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162 varargout{1} = xb; |
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163 varargout{2} = yb; |
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164 else |
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165 varargout{1} = yb; |
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166 varargout{2} = xb; |
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167 endif |
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168 endif |
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169 |
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170 endfunction |
