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compass.m: Overhaul function. * scripts/plot/compass.m: Reduce arrowhead to 20% of body length. Recode input validation to be simpler.
author Rik <rik@octave.org>
date Thu, 19 Sep 2013 13:48:54 -0700
parents bc924baa2c4e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2005-2012 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} {} newplot ()
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21 ## @deftypefnx {Function File} {} newplot (@var{hfig})
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22 ## @deftypefnx {Function File} {} newplot (@var{hax})
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23 ## @deftypefnx {Function File} {@var{hax} =} newplot (@dots{})
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24 ## Prepare graphics engine to produce a new plot.
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25 ##
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26 ## This function is called at the beginning of all high-level plotting
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27 ## functions. It is not normally required in user programs. @code{newplot}
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28 ## queries the @qcode{"NextPlot"} field of the current figure and axis to
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29 ## determine what to do.
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30 ##
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31 ## @multitable @columnfractions .25 .75
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32 ## @headitem Figure NextPlot @tab Action
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33 ## @item @qcode{"new"} @tab Create a new figure and make it the current figure.
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34 ##
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35 ## @item @qcode{"add"} (default) @tab Add new graphic objects to the current figure.
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36 ##
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37 ## @item @qcode{"replacechildren"} @tab Delete child objects whose HandleVisibility is
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38 ## set to @qcode{"on"}. Set NextPlot property to @qcode{"add"}. This
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39 ## typically clears a figure, but leaves in place hidden objects such as
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40 ## menubars. This is equivalent to @code{clf}.
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41 ##
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42 ## @item @qcode{"replace"} @tab Delete all child objects of the figure and
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43 ## reset all figure properties to their defaults. However, the following
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44 ## four properties are not reset: Position, Units, PaperPosition, PaperUnits.
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45 ## This is equivalent to @code{clf reset}.
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46 ## @end multitable
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47 ##
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48 ## @multitable @columnfractions .25 .75
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49 ## @headitem Axis NextPlot @tab Action
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50 ## @item @qcode{"add"} @tab Add new graphic objects to the current axes. This is
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51 ## equivalent to @code{hold on}.
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52 ##
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53 ## @item @qcode{"replacechildren"} @tab Delete child objects whose HandleVisibility is
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54 ## set to @qcode{"on"}, but leave axis properties unmodified. This typically
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55 ## clears a plot, but preserves special settings such as log scaling for
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56 ## axes. This is equivalent to @code{cla}.
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57 ##
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58 ## @item @qcode{"replace"} (default) @tab Delete all child objects of the
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59 ## axis and reset all axis properties to their defaults. However, the
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60 ## following properties are not reset: Position, Units. This is equivalent
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61 ## to @code{cla reset}.
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62 ## @end multitable
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63 ##
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64 ## If the optional input @var{hfig} or @var{hax} is given then prepare the
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65 ## specified figure or axes rather than the current figure and axes.
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66 ##
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67 ## The optional return value @var{hax} is a graphics handle to the created
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68 ## axes object (not figure).
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69 ##
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70 ## @strong{Caution:} Calling @code{newplot} may change the current figure and
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71 ## current axis.
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72 ## @end deftypefn
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73
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74 ## FIXME: The Matlab function takes an optional list of file handles, hsave,
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75 ## which are not deleted when the figure and axes are prepared.
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76 ## I'm sure there is a good reason for that, but coding such
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77 ## compatibility is really tricky and doesn't serve much purpose since
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78 ## newplot is nearly exclusively used by Octave's internal plotting
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79 ## functions. In Octave's case the argument is almost always null,
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80 ## or occasionally the axis handle to plot into.
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81
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82 function hax = newplot (hsave = [])
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83
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84 if (nargin > 1)
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85 print_usage ();
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86 endif
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87
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88 cf = [];
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89 ca = [];
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90
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91 if (! isempty (hsave))
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92 ## Find the first valid axes
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93 ca = ancestor (hsave, "axes", "toplevel");
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94 ca = ca(find (ca, 1));
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95 ## Next, find the figure associated with any axis found
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96 if (! isempty (ca))
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97 cf = ancestor (ca, "figure", "toplevel");
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98 else
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99 cf = ancestor (hsave, "figure", "toplevel");
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100 cf = cf(find (cf, 1));
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101 endif
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102 endif
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103
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104 if (isempty (cf))
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105 ## get current figure, or create a new one if necessary
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106 cf = gcf ();
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107 else
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108 ## switch to figure provided without causing other updates
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109 set (0, "currentfigure", cf);
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110 endif
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111
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112 fnp = get (cf, "nextplot");
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113 switch (fnp)
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114 case "add"
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115 ## Default case. Doesn't require action.
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116 case "new"
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117 ## Ordinarily, create a new figure to hold plot.
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118 ## But, if user has requested preparing a specific axis, then
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119 ## use the existing figure to hold the requested axis.
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120 if (isempty (ca))
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121 cf = figure ();
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122 endif
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123 case "replacechildren"
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124 kids = get (cf, "children");
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125 if (! isempty (ca))
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126 kids(kids == ca) = [];
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127 endif
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128 delete (kids);
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129 case "replace"
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130 kids = allchild (cf);
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131 if (! isempty (ca))
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132 kids(kids == ca) = [];
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133 endif
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134 delete (kids);
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135 reset (cf);
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136 endswitch
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137 set (cf, "nextplot", "add"); # Matlab compatibility
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138
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139 if (isempty (ca))
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140 ca = gca ();
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141 else
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142 set (cf, "currentaxes", ca);
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143 endif
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144
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145 ## FIXME: Is this necessary anymore?
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146 ## It seems like a kluge that belongs somewhere else.
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147 if (strcmp (get (ca, "__hold_all__"), "off"))
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148 __next_line_color__ (true);
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149 __next_line_style__ (true);
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150 else
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151 __next_line_color__ (false);
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152 __next_line_style__ (false);
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153 endif
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154
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155 anp = get (ca, "nextplot");
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156 switch (anp)
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157 case "add"
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158 ## Default case. Doesn't require action.
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159 case "replacechildren"
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160 delete (get (ca, "children"));
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161 case "replace"
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162 __go_axes_init__ (ca, "replace");
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163 __request_drawnow__ ();
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164 ## FIXME: The code above should perform the following:
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165 ###########################
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166 ## delete (allchild (ca));
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167 ## reset (ca);
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168 ###########################
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169 ## Actually, __go_axes_init__ does both less and more.
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170 ## It doesn't really remove all children since it re-instantiates
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171 ## xlabel, ylabel, zlabel, and title text objects.
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172 ## Also it preserves font properties like fontsize.
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173 ## For the time being, in order to have axis labels and title work,
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174 ## the above code is is required.
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175 endswitch
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176
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177 if (nargout > 0)
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178 hax = ca;
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179 endif
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180
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181 endfunction
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182
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183
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184 %!test
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185 %! hf = figure ("visible", "off");
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186 %! unwind_protect
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187 %! p = plot ([0, 1]);
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188 %! hax = newplot ();
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189 %! assert (hax, gca);
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190 %! assert (isempty (get (gca, "children")));
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191 %! unwind_protect_cleanup
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192 %! close (hf);
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193 %! end_unwind_protect
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194