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Add demo to area.m to demonstrate "ydata" updater. scripts/plot/area.m: Add demo which modifies the "ydata" hggroup property.
author Ben Abbott <bpabbott@mac.com>
date Mon, 22 Jul 2013 03:05:16 +0200
parents 4bbc4b703fe4
children cae21eadc27b
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rev   line source
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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{h}, @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}. This shows the
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28 ## contributions of each column value to the row sum. It is functionally
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29 ## similar to @code{plot (@var{x}, cumsum (@var{y}, 2))}, except that the
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30 ## area under the curve is shaded.
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31 ##
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32 ## If the @var{x} argument is omitted it defaults to
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33 ## @code{1 : rows (@var{y})}. A value @var{lvl} can be defined that determines
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34 ## where the base level of the shading under the curve should be defined. The
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35 ## default level is 0.
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36 ##
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37 ## Additional arguments to the @code{area} function are passed directly to
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38 ## @code{patch}.
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39 ##
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40 ## The optional return value @var{h} is a graphics handle to the hggroup
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41 ## object representing the area patch objects. The "BaseValue" property
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42 ## of the hggroup can be used to adjust the level where shading begins.
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43 ##
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44 ## Example: Verify identity sin^2 + cos^2 = 1
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45 ##
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46 ## @example
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47 ## @group
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48 ## t = linspace (0, 2*pi, 100)';
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49 ## y = [sin(t).^2, cos(t).^2)];
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50 ## area (t, y);
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51 ## legend ('sin^2', 'cos^2', 'location', 'NorthEastOutside');
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52 ## @end group
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53 ## @end example
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54 ## @seealso{plot, patch}
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55 ## @end deftypefn
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56
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57 function h = area (varargin)
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58
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59 [ax, varargin, nargin] = __plt_get_axis_arg__ ("area", varargin{:});
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60
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61 if (nargin == 0)
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62 print_usage ();
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63 endif
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64
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65 idx = 1;
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66 x = y = [];
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67 bv = 0;
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68 args = {};
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69 ## Check for (X) or (X,Y) arguments and possible base value.
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70 if (nargin >= idx && ismatrix (varargin{idx}))
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71 y = varargin{idx};
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72 idx++;
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73 if (nargin >= idx)
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74 if (isscalar (varargin{idx}))
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75 bv = varargin{idx};
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76 idx++;
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77 elseif (ismatrix (varargin{idx}))
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78 x = y;
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79 y = varargin{idx};
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80 idx++;
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81 if (nargin >= idx && isscalar (varargin{idx}))
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82 bv = varargin{idx};
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83 idx++;
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84 endif
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85 endif
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86 endif
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87 else
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88 print_usage ();
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89 endif
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90 ## Check for additional args.
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91 if (nargin >= idx)
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92 args = {varargin{idx:end}};
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93 endif
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94 newplot ();
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95 if (isvector (y))
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96 y = y(:);
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97 endif
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98 if (isempty (x))
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99 x = repmat ([1:rows(y)]', 1, columns (y));
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100 elseif (isvector (x))
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101 x = repmat (x(:), 1, columns (y));
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102 endif
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103
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104 oldax = gca ();
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105 unwind_protect
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106 axes (ax);
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107 tmp = __area__ (ax, x, y, bv, args{:});
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108 unwind_protect_cleanup
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109 axes (oldax);
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110 end_unwind_protect
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111
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112 if (nargout > 0)
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113 h = tmp;
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114 endif
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115
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116 endfunction
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117
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118 function retval = __area__ (ax, x, y, bv, varargin)
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119
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120 y0 = bv * ones (1, rows (y));
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121 y0 = zeros (1, rows (y));
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122 retval = [];
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123 for i = 1: columns (y);
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124 hg = hggroup ();
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125 retval = [retval; hg];
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126 args = __add_datasource__ ("area", hg, {"x", "y"}, varargin{:});
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127
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128 x1 = x(:, 1).';
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129 y1 = y (:, i).';
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130 addproperty ("xdata", hg, "data", x1);
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131 addproperty ("ydata", hg, "data", y1);
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132
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133 addlistener (hg, "xdata", @update_data);
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134 addlistener (hg, "ydata", @update_data);
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135
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136 if (i == 1)
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137 h = patch (ax, [x1(1), x1, fliplr(x1)], [bv, y1, bv*ones(1, length(y1))],
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138 __next_line_color__ (), "parent", hg);
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139 else
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140 y1 = y0 + y1;
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141 h = patch (ax, [x1(1), x1, fliplr(x1)], [y0(1), y1, fliplr(y0)],
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142 __next_line_color__ (), "parent", hg);
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143 endif
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144
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145 y0 = y1;
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146
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147 addproperty ("basevalue", hg, "data", bv);
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148 addlistener (hg, "basevalue", @move_baseline);
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149
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150 addproperty ("edgecolor", hg, "patchedgecolor", get (h, "edgecolor"));
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151 addproperty ("linewidth", hg, "patchlinewidth", get (h, "linewidth"));
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152 addproperty ("linestyle", hg, "patchlinestyle", get (h, "linestyle"));
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153 addproperty ("facecolor", hg, "patchfacecolor", get (h, "facecolor"));
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154
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155 addlistener (hg, "edgecolor", @update_props);
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156 addlistener (hg, "linewidth", @update_props);
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157 addlistener (hg, "linestyle", @update_props);
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158 addlistener (hg, "facecolor", @update_props);
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159
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160 addproperty ("areagroup", hg, "data");
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161 set (retval, "areagroup", retval);
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162
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163 if (! isempty (args))
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164 set (hg, args{:});
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165 endif
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166 endfor
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167
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168 endfunction
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169
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170 function update_props (h, d)
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171 kids = get (h, "children");
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172 set (kids, "edgecolor", get (h, "edgecolor"),
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173 "linewidth", get (h, "linewidth"),
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174 "linestyle", get (h, "linestyle"),
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175 "facecolor", get (h, "facecolor"));
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176 endfunction
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177
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178 function move_baseline (h, d)
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179 persistent recursion = false;
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180
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181 ## Don't allow recursion
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182 if (! recursion)
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183 unwind_protect
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184 recursion = true;
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185 hlist = get (h, "areagroup");
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186 b0 = get (h, "basevalue");
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187
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188 for hh = hlist(:)'
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189 if (hh != h)
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190 b1 = get (hh, "basevalue");
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191 if (b1 != b0)
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192 set (hh, "basevalue", b0);
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193 endif
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194 endif
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195 endfor
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196 update_data (h, d);
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197 unwind_protect_cleanup
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198 recursion = false;
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199 end_unwind_protect
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200 endif
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201 endfunction
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202
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203 function update_data (h, d)
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204 hlist = get (h, "areagroup");
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205 bv = get (h, "basevalue");
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206 for i = 1 : length (hlist)
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207 hh = hlist(i);
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208 x1 = get (hh, "xdata")(:);
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209 y1 = get (hh, "ydata")(:);
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210
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211 set (get (hh, "children"), "xdata", [x1(1); x1; flipud(x1)]);
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212 if (i == 1)
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213 set (get (hh, "children"), "ydata", [bv; y1; bv*ones(length(y1), 1)]);
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214 else
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215 y1 = y0 + y1;
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216 set (get (hh, "children"), "ydata", [y0(1); y1; flipud(y0)]);
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217 endif
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218
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219 y0 = y1;
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220 endfor
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221 endfunction
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222
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223
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224 %!demo
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225 %! # Verify identity sin^2 + cos^2 = 1
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226 %! clf;
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227 %! t = linspace (0, 2*pi, 100)';
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228 %! y = [sin(t).^2, cos(t).^2];
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229 %! area (t, y);
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230 %! axis tight
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231 %! legend ('sin^2', 'cos^2', 'location', 'NorthEastOutside');
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232
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233 %!demo
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234 %! # Show effects of setting BaseValue
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235 %! clf;
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236 %! x = [-2:0.1:2]';
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237 %! y = x.^2 - 1;
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238 %! subplot (1, 2, 1)
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239 %! area (x, y);
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240 %! title ({'Parabola y = x^2 -1';'BaseValue = 0'});
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241 %! subplot (1, 2, 2)
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242 %! h = area (x, y);
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243 %! set (h, 'basevalue', -1);
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244 %! title ({'Parabola y = x^2 -1';'BaseValue = -1'});
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245
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246 %!demo
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247 %! x = 0:10;
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248 %! y = rand (size (x));
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249 %! h = area (x, y);
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250 %! set (h, 'ydata', sort (get (h, 'ydata')))