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annotate scripts/plot/area.m @ 17141:13da13e1e17f

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waitbar.m: Cache axes and patch handles in figure's __guidata__. * scripts/plot/waitbar.m: Instead of calling "findobj" twice, cache the handles for the wait bar axes and patch objects in the figure's __guidata__ field.
author Philipp Kutin <philipp.kutin@gmail.com>
date Mon, 29 Jul 2013 12:18:16 +0200
parents eaab03308c0b
children df4c4b7708a4
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2007-2012 Michael Goffioul
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2 ## Copyright (C) 2007-2009 David Bateman
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} area (@var{y})
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22 ## @deftypefnx {Function File} {} area (@var{x}, @var{y})
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23 ## @deftypefnx {Function File} {} area (@dots{}, @var{lvl})
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24 ## @deftypefnx {Function File} {} area (@dots{}, @var{prop}, @var{val}, @dots{})
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25 ## @deftypefnx {Function File} {} area (@var{hax}, @dots{})
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26 ## @deftypefnx {Function File} {@var{h} =} area (@dots{})
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27 ## Area plot of the columns of @var{y}.
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28 ##
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29 ## This plot shows the contributions of each column value to the row sum. It
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30 ## is functionally similar to @code{plot (@var{x}, cumsum (@var{y}, 2))},
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31 ## except that the area under the curve is shaded.
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32 ##
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33 ## If the @var{x} argument is omitted it defaults to @code{1:rows (@var{y})}.
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34 ## A value @var{lvl} can be defined that determines where the base level of
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35 ## the shading under the curve should be defined. The default level is 0.
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36 ##
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37 ## Additional property/value pairs are passed directly to the underlying patch
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38 ## object.
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39 ##
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40 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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41 ## rather than the current axes returned by @code{gca}.
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42 ##
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43 ## The optional return value @var{h} is a graphics handle to the hggroup
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44 ## object comprising the area patch objects. The "BaseValue" property
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45 ## of the hggroup can be used to adjust the level where shading begins.
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46 ##
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47 ## Example: Verify identity sin^2 + cos^2 = 1
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48 ##
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49 ## @example
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50 ## @group
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51 ## t = linspace (0, 2*pi, 100)';
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52 ## y = [sin(t).^2, cos(t).^2)];
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53 ## area (t, y);
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54 ## legend ("sin^2", "cos^2", "location", "NorthEastOutside");
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55 ## @end group
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56 ## @end example
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57 ## @seealso{plot, patch}
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58 ## @end deftypefn
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59
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60 function h = area (varargin)
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61
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62 [hax, varargin, nargin] = __plt_get_axis_arg__ ("area", varargin{:});
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63
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64 if (nargin == 0)
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65 print_usage ();
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66 endif
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67
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68 idx = 1;
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69 x = y = [];
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70 bv = 0;
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71 args = {};
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72 ## Check for (X) or (X,Y) arguments and possible base value.
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73 if (nargin >= idx && ismatrix (varargin{idx}))
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74 y = varargin{idx};
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75 idx++;
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76 if (nargin >= idx)
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77 if (isscalar (varargin{idx}))
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78 bv = varargin{idx};
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79 idx++;
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80 elseif (ismatrix (varargin{idx}))
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81 x = y;
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82 y = varargin{idx};
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83 idx++;
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84 if (nargin >= idx && isscalar (varargin{idx}))
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85 bv = varargin{idx};
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86 idx++;
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87 endif
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88 endif
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89 endif
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90 else
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91 print_usage ();
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92 endif
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93 ## Check for additional args.
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94 if (nargin >= idx)
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95 args = {varargin{idx:end}};
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96 endif
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97 if (isvector (y))
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98 y = y(:);
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99 endif
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100 if (isempty (x))
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101 x = repmat ([1:rows(y)]', 1, columns (y));
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102 elseif (isvector (x))
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103 x = repmat (x(:), 1, columns (y));
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104 endif
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105
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106 oldfig = ifelse (isempty (hax), [], get (0, "currentfigure"));
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107 unwind_protect
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108 hax = newplot (hax);
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109 htmp = __area__ (hax, x, y, bv, args{:});
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110 unwind_protect_cleanup
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111 if (! isempty (oldfig))
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112 set (0, "currentfigure", oldfig);
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113 endif
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114 end_unwind_protect
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115
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116 if (nargout > 0)
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117 h = htmp;
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118 endif
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119
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120 endfunction
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121
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122 function retval = __area__ (ax, x, y, bv, varargin)
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123
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124 y0 = bv * ones (1, rows (y));
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125 y0 = zeros (1, rows (y));
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126 retval = [];
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127 for i = 1: columns (y);
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128 hg = hggroup ();
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129 retval = [retval; hg];
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130 args = __add_datasource__ ("area", hg, {"x", "y"}, varargin{:});
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131
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132 x1 = x(:, 1).';
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133 y1 = y (:, i).';
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134 addproperty ("xdata", hg, "data", x1);
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135 addproperty ("ydata", hg, "data", y1);
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136
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137 addlistener (hg, "xdata", @update_data);
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138 addlistener (hg, "ydata", @update_data);
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139
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140 if (i == 1)
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141 h = patch (ax, [x1(1), x1, fliplr(x1)], [bv, y1, bv*ones(1, length(y1))],
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142 __next_line_color__ (), "parent", hg);
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143 else
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144 y1 = y0 + y1;
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145 h = patch (ax, [x1(1), x1, fliplr(x1)], [y0(1), y1, fliplr(y0)],
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146 __next_line_color__ (), "parent", hg);
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147 endif
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148
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149 y0 = y1;
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150
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151 addproperty ("basevalue", hg, "data", bv);
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152 addlistener (hg, "basevalue", @move_baseline);
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153
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154 addproperty ("edgecolor", hg, "patchedgecolor", get (h, "edgecolor"));
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155 addproperty ("linewidth", hg, "patchlinewidth", get (h, "linewidth"));
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156 addproperty ("linestyle", hg, "patchlinestyle", get (h, "linestyle"));
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157 addproperty ("facecolor", hg, "patchfacecolor", get (h, "facecolor"));
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158
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159 addlistener (hg, "edgecolor", @update_props);
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160 addlistener (hg, "linewidth", @update_props);
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161 addlistener (hg, "linestyle", @update_props);
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162 addlistener (hg, "facecolor", @update_props);
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163
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164 addproperty ("areagroup", hg, "data");
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165 set (retval, "areagroup", retval);
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166
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167 if (! isempty (args))
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168 set (hg, args{:});
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169 endif
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170 endfor
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171
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172 endfunction
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173
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174 function update_props (h, d)
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175 kids = get (h, "children");
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176 set (kids, "edgecolor", get (h, "edgecolor"),
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177 "linewidth", get (h, "linewidth"),
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178 "linestyle", get (h, "linestyle"),
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179 "facecolor", get (h, "facecolor"));
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180 endfunction
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181
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182 function move_baseline (h, d)
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183 persistent recursion = false;
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184
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185 ## Don't allow recursion
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186 if (! recursion)
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187 unwind_protect
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188 recursion = true;
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189 hlist = get (h, "areagroup");
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190 b0 = get (h, "basevalue");
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191
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192 for hh = hlist(:)'
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193 if (hh != h)
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194 b1 = get (hh, "basevalue");
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195 if (b1 != b0)
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196 set (hh, "basevalue", b0);
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197 endif
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198 endif
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199 endfor
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200 update_data (h, d);
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201 unwind_protect_cleanup
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202 recursion = false;
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203 end_unwind_protect
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204 endif
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205 endfunction
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206
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207 function update_data (h, d)
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208 hlist = get (h, "areagroup");
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209 bv = get (h, "basevalue");
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210 for i = 1 : length (hlist)
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211 hh = hlist(i);
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212 x1 = get (hh, "xdata")(:);
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213 y1 = get (hh, "ydata")(:);
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214
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215 set (get (hh, "children"), "xdata", [x1(1); x1; flipud(x1)]);
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216 if (i == 1)
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217 set (get (hh, "children"), "ydata", [bv; y1; bv*ones(length(y1), 1)]);
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218 else
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219 y1 = y0 + y1;
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220 set (get (hh, "children"), "ydata", [y0(1); y1; flipud(y0)]);
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221 endif
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222
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223 y0 = y1;
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224 endfor
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225 endfunction
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226
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227
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228 %!demo
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229 %! # Verify identity sin^2 + cos^2 = 1
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230 %! clf;
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231 %! t = linspace (0, 2*pi, 100)';
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232 %! y = [sin(t).^2, cos(t).^2];
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233 %! area (t, y);
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234 %! axis tight
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235 %! legend ('sin^2', 'cos^2', 'location', 'NorthEastOutside');
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236
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237 %!demo
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238 %! # Show effects of setting BaseValue
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239 %! clf;
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240 %! x = [-2:0.1:2]';
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241 %! y = x.^2 - 1;
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242 %! subplot (1, 2, 1)
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243 %! area (x, y);
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244 %! title ({'Parabola y = x^2 -1';'BaseValue = 0'});
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245 %! subplot (1, 2, 2)
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246 %! h = area (x, y);
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247 %! set (h, 'basevalue', -1);
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248 %! title ({'Parabola y = x^2 -1';'BaseValue = -1'});
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249
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250 %!demo
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251 %! x = 0:10;
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252 %! y = rand (size (x));
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253 %! h = area (x, y);
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254 %! set (h, 'ydata', sort (get (h, 'ydata')))