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annotate scripts/plot/draw/area.m @ 18403:d7c88126ac03

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fill.m: Don't replicate cdata matrix to x,y size when it is a string. * fill.m: Don't replicate cdata matrix to x,y size when it is a string. Add new demo using replication of cdata.
author Rik <rik@octave.org>
date Wed, 22 Jan 2014 18:03:44 -0800
parents d63878346099
children a142f35f3cb6 446c46af4b42
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rev   line source
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d63878346099 maint: Update copyright notices for release.
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1 ## Copyright (C) 2007-2013 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 @qcode{"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 x = y = [];
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69 bv = 0;
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70
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71 num_numeric = find (cellfun ("isclass", varargin, "char"), 1) - 1;
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72 if (isempty (num_numeric))
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73 num_numeric = nargin;
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74 endif
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75
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76 switch (num_numeric)
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77 case 1
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78 y = varargin{1};
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79 case 2
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80 if (isscalar (varargin{2}))
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81 y = varargin{1};
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82 bv = varargin{2};
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83 else
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84 x = varargin{1};
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85 y = varargin{2};
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86 endif
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87 case 3
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88 x = varargin{1};
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89 y = varargin{2};
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90 bv = varargin{3};
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91 otherwise
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92 print_usage ();
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93 endswitch
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94
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95 if (! isreal (x) || ! isreal (y))
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96 error ("area: X and Y must be real vectors or matrices");
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97 endif
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98 if (! isreal (bv) || ! isscalar (bv))
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99 error ("area: LVL must be a real scalar");
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100 endif
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101
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102 if (isvector (y))
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103 y = y(:);
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104 endif
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105 if (isempty (x))
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106 x = repmat ([1:rows(y)]', 1, columns (y));
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107 elseif (isvector (x))
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108 x = repmat (x(:), 1, columns (y));
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109 endif
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110
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111 oldfig = [];
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112 if (! isempty (hax))
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113 oldfig = get (0, "currentfigure");
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114 endif
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115 unwind_protect
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116 hax = newplot (hax);
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117 htmp = __area__ (hax, x, y, bv, varargin{num_numeric+1:end});
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118 unwind_protect_cleanup
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119 if (! isempty (oldfig))
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120 set (0, "currentfigure", oldfig);
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121 endif
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122 end_unwind_protect
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123
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124 if (nargout > 0)
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125 h = htmp;
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126 endif
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127
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128 endfunction
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129
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130 function retval = __area__ (ax, x, y, bv, varargin)
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131
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132 y0 = bv * ones (1, rows (y));
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133 y0 = zeros (1, rows (y));
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134 retval = [];
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135 for i = 1: columns (y);
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136
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137 lc = __next_line_color__ ();
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138
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139 ## Must occur after __next_line_color__ in order to work correctly.
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140 hg = hggroup ();
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141 retval = [retval; hg];
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142 args = __add_datasource__ ("area", hg, {"x", "y"}, varargin{:});
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143
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144 x1 = x(:, 1)';
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145 y1 = y(:, i)';
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146 addproperty ("xdata", hg, "data", x1);
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147 addproperty ("ydata", hg, "data", y1);
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148
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149 addlistener (hg, "xdata", @update_data);
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150 addlistener (hg, "ydata", @update_data);
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151
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152 if (i == 1)
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153 h = patch (ax, [x1(1), x1, fliplr(x1)], [bv, y1, bv*ones(1, length(y1))],
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154 lc, "parent", hg);
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155 else
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156 y1 = y0 + y1;
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157 h = patch (ax, [x1(1), x1, fliplr(x1)], [y0(1), y1, fliplr(y0)],
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158 lc, "parent", hg);
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159 endif
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160
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161 y0 = y1;
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162
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163 addproperty ("basevalue", hg, "data", bv);
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164 addlistener (hg, "basevalue", @move_baseline);
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165
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166 addproperty ("edgecolor", hg, "patchedgecolor", get (h, "edgecolor"));
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167 addproperty ("facecolor", hg, "patchfacecolor", get (h, "facecolor"));
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168 addproperty ("linestyle", hg, "patchlinestyle", get (h, "linestyle"));
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169 addproperty ("linewidth", hg, "patchlinewidth", get (h, "linewidth"));
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170
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171 addlistener (hg, "edgecolor", @update_props);
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172 addlistener (hg, "facecolor", @update_props);
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173 addlistener (hg, "linestyle", @update_props);
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174 addlistener (hg, "linewidth", @update_props);
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175
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176 addproperty ("areagroup", hg, "data");
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177 set (retval, "areagroup", retval);
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178
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179 ## Matlab property, although Octave does not implement it.
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180 addproperty ("hittestarea", hg, "radio", "on|{off}", "off");
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181
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182 if (! isempty (args))
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183 set (hg, args{:});
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184 endif
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185 endfor
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186
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187 endfunction
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188
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189 function update_props (h, d)
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190 kids = get (h, "children");
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191 set (kids, "edgecolor", get (h, "edgecolor"),
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192 "facecolor", get (h, "facecolor"),
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193 "linestyle", get (h, "linestyle"),
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194 "linewidth", get (h, "linewidth"));
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195 endfunction
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196
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197 function move_baseline (h, d)
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198 persistent recursion = false;
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199
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200 ## Don't allow recursion
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201 if (! recursion)
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202 unwind_protect
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203 recursion = true;
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204 hlist = get (h, "areagroup");
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205 b0 = get (h, "basevalue");
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206
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207 for hh = hlist(:)'
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208 if (hh != h)
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209 b1 = get (hh, "basevalue");
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210 if (b1 != b0)
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211 set (hh, "basevalue", b0);
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212 endif
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213 endif
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214 endfor
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215 update_data (h, d);
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216 unwind_protect_cleanup
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217 recursion = false;
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218 end_unwind_protect
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219 endif
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220 endfunction
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221
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222 function update_data (h, d)
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223 hlist = get (h, "areagroup");
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224 bv = get (h, "basevalue");
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225 for i = 1 : length (hlist)
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226 hh = hlist(i);
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227 x1 = get (hh, "xdata")(:);
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228 y1 = get (hh, "ydata")(:);
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229
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230 set (get (hh, "children"), "xdata", [x1(1); x1; flipud(x1)]);
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231 if (i == 1)
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232 set (get (hh, "children"), "ydata", [bv; y1; bv*ones(length(y1), 1)]);
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233 else
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234 y1 = y0 + y1;
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235 set (get (hh, "children"), "ydata", [y0(1); y1; flipud(y0)]);
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236 endif
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237
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238 y0 = y1;
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239 endfor
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240 endfunction
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241
ab1c6e6d1be6 area.m: Add demos and redo docstring.
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242
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243 %!demo
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244 %! ## Verify identity sin^2 + cos^2 = 1
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245 %! clf;
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246 %! t = linspace (0, 2*pi, 100)';
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247 %! y = [sin(t).^2, cos(t).^2];
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248 %! area (t, y);
16917
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249 %! axis tight
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250 %! legend ('sin^2', 'cos^2', 'location', 'NorthEastOutside');
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251 %! title ('area() plot');
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252
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253 %!demo
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254 %! ## Show effects of setting BaseValue
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255 %! clf;
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256 %! x = [-2:0.1:2]';
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257 %! y = x.^2 - 1;
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258 %! subplot (1, 2, 1)
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259 %! area (x, y);
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260 %! title ({'Parabola y = x^2 -1';'BaseValue = 0'});
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261 %! subplot (1, 2, 2)
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262 %! h = area (x, y);
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263 %! set (h, 'basevalue', -1);
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264 %! title ({'Parabola y = x^2 -1';'BaseValue = -1'});
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265
17033
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266 %!demo
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267 %! clf;
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268 %! x = 0:10;
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269 %! y = rand (size (x));
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270 %! h = area (x, y);
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271 %! set (h, 'ydata', sort (get (h, 'ydata')))
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272 %! title ('area() plot of sorted data');
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b81b9d079515 Use '##' for comments which stand alone on a line.
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273
17437
cf5a8fccfc63 area.m: Overhaul function to fix color cycling.
Rik <rik@octave.org>
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274 %% Test input validation
cf5a8fccfc63 area.m: Overhaul function to fix color cycling.
Rik <rik@octave.org>
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275 %!error area ()
cf5a8fccfc63 area.m: Overhaul function to fix color cycling.
Rik <rik@octave.org>
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276 %!error area (1,2,3,4)
cf5a8fccfc63 area.m: Overhaul function to fix color cycling.
Rik <rik@octave.org>
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277 %!error <X and Y must be real vectors or matrices> area ({1})
cf5a8fccfc63 area.m: Overhaul function to fix color cycling.
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278 %!error <X and Y must be real vectors or matrices> area (1+i)
cf5a8fccfc63 area.m: Overhaul function to fix color cycling.
Rik <rik@octave.org>
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279 %!error <X and Y must be real vectors or matrices> area (1:2, {1, 2})
cf5a8fccfc63 area.m: Overhaul function to fix color cycling.
Rik <rik@octave.org>
parents: 17336
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280 %!error <X and Y must be real vectors or matrices> area (1:2, [1 1+i])
cf5a8fccfc63 area.m: Overhaul function to fix color cycling.
Rik <rik@octave.org>
parents: 17336
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281 %!error <LVL must be a real scalar> area (1, i)
cf5a8fccfc63 area.m: Overhaul function to fix color cycling.
Rik <rik@octave.org>
parents: 17336
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282 %!error <LVL must be a real scalar> area (1, 2, ones (2,2))
cf5a8fccfc63 area.m: Overhaul function to fix color cycling.
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parents: 17336
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283