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annotate scripts/time/datetick.m @ 17210:73dd413f2c3e
datetick.m: Use modern coding conventions in function.
* scripts/time/datetick.m: Use modern coding conventions in function.
| author | Rik <rik@octave.org> |
|---|---|
| date | Thu, 08 Aug 2013 14:34:12 -0700 |
| parents | 8899c785cc99 |
| children | 87ba70043bfc |
| rev | line source |
|---|---|
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1 ## Copyright (C) 2008-2012 David Bateman |
| 8112 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, see | |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 18 | |
| 19 ## -*- texinfo -*- | |
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20 ## @deftypefn {Function File} {} datetick () |
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21 ## @deftypefnx {Function File} {} datetick (@var{form}) |
| 8112 | 22 ## @deftypefnx {Function File} {} datetick (@var{axis}, @var{form}) |
| 23 ## @deftypefnx {Function File} {} datetick (@dots{}, "keeplimits") | |
| 24 ## @deftypefnx {Function File} {} datetick (@dots{}, "keepticks") | |
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25 ## @deftypefnx {Function File} {} datetick (@var{hax}, @dots{}) |
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26 ## Add date formatted tick labels to an axis. The axis to apply the |
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27 ## ticks to is determined by @var{axis} which can take the values "x", |
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28 ## "y", or "z". The default value is "x". The formatting of the labels is |
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29 ## determined by the variable @var{form}, which can either be a string or |
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30 ## positive integer that @code{datestr} accepts. |
| 8112 | 31 ## @seealso{datenum, datestr} |
| 32 ## @end deftypefn | |
| 33 | |
| 34 function datetick (varargin) | |
| 35 | |
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36 [hax, varargin, nargin] = __plt_get_axis_arg__ ("datetick", varargin{:}); |
| 8112 | 37 |
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38 oldfig = ifelse (isempty (hax), [], get (0, "currentfigure")); |
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39 if (isempty (hax)) |
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40 hax = gca (); |
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41 endif |
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42 |
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43 unwind_protect |
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44 ## FIXME: This will bring the axes to the top of the stack. |
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45 ## This may not always be desirable if there are multiple axes |
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46 ## objects. |
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47 axes (hax); |
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48 __datetick__ (varargin{:}); |
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49 unwind_protect_cleanup |
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50 if (! isempty (oldfig)) |
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51 set (0, "currentfigure", oldfig); |
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52 endif |
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53 end_unwind_protect |
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54 |
| 8112 | 55 endfunction |
| 56 | |
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57 |
| 8112 | 58 %!demo |
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59 %! clf; |
| 8112 | 60 %! yr = 1900:10:2000; |
| 61 %! pop = [76.094, 92.407, 106.461, 123.077 131.954, 151.868, 179.979, ... | |
| 62 %! 203.984, 227.225, 249.623, 282.224]; | |
| 63 %! plot (datenum (yr, 1, 1), pop); | |
| 64 %! title ("US population (millions)"); | |
| 65 %! xlabel ("Year"); | |
| 66 %! datetick ("x", "YYYY"); | |
| 67 | |
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68 %!demo |
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69 %! clf; |
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70 %! yr = 1988:2:2002; |
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71 %! yr = datenum (yr,1,1); |
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72 %! pr = [12.1 13.3 12.6 13.1 13.3 14.1 14.4 15.2]; |
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73 %! plot (yr, pr, "-o"); |
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74 %! xlabel ("year"); |
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75 %! ylabel ("average price"); |
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76 %! ax = gca; |
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77 %! set (ax, "xtick", datenum (1990:5:2005,1,1)); |
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78 %! datetick (2, "keepticks"); |
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79 %! set (ax, "ytick", 12:16); |
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80 |
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81 ## Remove from test statistics. No real tests possible. |
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82 %!assert (1) |
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83 |
| 8112 | 84 function __datetick__ (varargin) |
| 85 | |
| 86 keeplimits = false; | |
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87 idx = strcmpi (varargin, "keeplimits"); |
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88 if (any (idx)) |
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89 keeplimits = true; |
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90 varargin = varargin(! idx); |
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91 endif |
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92 keepticks = false; |
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93 idx = strcmpi (varargin, "keepticks"); |
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94 if (any (idx)) |
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95 keepticks = true; |
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96 varargin = varargin(! idx); |
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97 endif |
| 8112 | 98 |
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99 nargin = numel (varargin); |
| 8112 | 100 form = []; |
| 101 ax = "x"; | |
| 102 | |
| 103 if (nargin != 0) | |
| 104 arg = varargin{1}; | |
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105 if (ischar (arg) && any (strcmpi (arg, {"x", "y", "z"}))) |
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106 ax = tolower (arg); |
| 8112 | 107 if (nargin > 1) |
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108 form = varargin{2}; |
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109 varargin(1:2) = []; |
| 8112 | 110 else |
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111 varargin(1) = []; |
| 8112 | 112 endif |
| 113 else | |
| 114 form = arg; | |
| 115 varargin(1) = []; | |
| 116 endif | |
| 117 endif | |
| 118 | |
| 119 ## Don't publish the existence of this variable for use with dateaxis | |
| 120 if (length (varargin) > 0) | |
| 121 startdate = varargin{1}; | |
| 122 else | |
| 123 startdate = []; | |
| 124 endif | |
| 125 | |
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126 if (! isempty (form)) |
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127 if (isnumeric (form)) |
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128 if (! isscalar (form) || form < 0 || form != fix (form)) |
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129 error ("datetick: expecting FORM argument to be a positive integer"); |
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130 endif |
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131 elseif (! ischar (form)) |
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132 error ("datetick: expecting valid date format string"); |
| 8112 | 133 endif |
| 134 endif | |
| 135 | |
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136 if (keepticks) |
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137 ticks = get (gca (), [ax "tick"]); |
| 8112 | 138 else |
| 139 ## Need to do our own axis tick position calculation as | |
| 140 ## year, etc, don't fallback on nice datenum values. | |
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141 objs = findall (gca ()); |
| 8112 | 142 xmax = NaN; |
| 143 xmin = NaN; | |
| 144 for i = 1 : length (objs) | |
| 145 fld = get (objs (i)); | |
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146 if (isfield (fld, [ax "data"])) |
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147 xdata = getfield (fld, [ax "data"])(:); |
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148 xmin = min (xmin, min (xdata)); |
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149 xmax = max (xmax, max (xdata)); |
| 8112 | 150 endif |
| 151 endfor | |
| 152 | |
| 153 if (isnan (xmin) || isnan (xmax)) | |
| 154 xmin = 0; | |
| 155 xmax = 1; | |
| 156 elseif (xmin == xmax) | |
| 157 xmax = xmin + 1; | |
| 158 endif | |
| 159 | |
| 160 N = 3; | |
| 161 if (xmax - xmin < N) | |
| 162 ## Day scale or less | |
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163 if (xmax - xmin < N / 24 / 60 / 60) |
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164 scl = 1 / 24 / 60 / 60; |
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165 elseif (xmax - xmin < N / 24 / 60) |
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166 scl = 1 / 24 / 60; |
| 8112 | 167 else |
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168 scl = 1 / 24; |
| 8112 | 169 endif |
| 170 sep = __calc_tick_sep__ (xmin / scl , xmax / scl); | |
| 171 xmin = sep * floor (xmin / scl / sep); | |
| 172 xmax = sep * ceil (xmax / scl / sep); | |
| 173 nticks = (xmax - xmin) / sep + 1; | |
| 174 xmin *= scl; | |
| 175 xmax *= scl; | |
| 176 else | |
| 177 [ymin, mmin, dmin] = datevec (xmin); | |
| 178 [ymax, mmax, dmax] = datevec (xmax); | |
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179 minyear = ymin + (mmin - 1) / 12 + (dmin - 1) / 12 / 30; |
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180 maxyear = ymax + (mmax - 1) / 12 + (dmax - 1) / 12 / 30; |
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181 minmonth = mmin + (dmin - 1) / 30; |
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182 maxmonth = (ymax - ymin) * 12 + mmax + (dmax - 1) / 30; |
| 8112 | 183 |
| 184 if (maxmonth - minmonth < N) | |
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185 sep = __calc_tick_sep__ (xmin, xmax); |
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186 xmin = sep * floor (xmin / sep); |
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187 xmax = sep * ceil (xmax / sep); |
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188 nticks = (xmax - xmin) / sep + 1; |
| 8112 | 189 elseif (maxyear - minyear < N) |
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190 sep = __calc_tick_sep__ (minmonth , maxmonth); |
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191 xmin = datenum (ymin, sep * floor (minmonth / sep), 1); |
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192 xmax = datenum (ymax, sep * ceil (maxmonth / sep), 1); |
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193 nticks = ceil (maxmonth / sep) - floor (minmonth / sep) + 1; |
| 8112 | 194 else |
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195 sep = __calc_tick_sep__ (minyear , maxyear); |
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196 xmin = datenum (sep * floor (minyear / sep), 1, 1); |
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197 xmax = datenum (sep * ceil (maxyear / sep), 1, 1); |
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198 nticks = ceil (maxyear / sep) - floor (minyear / sep) + 1; |
| 8112 | 199 endif |
| 200 endif | |
| 201 ticks = xmin + [0 : nticks - 1] / (nticks - 1) * (xmax - xmin); | |
| 202 endif | |
| 203 | |
| 204 if (isempty (form)) | |
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205 r = max (ticks) - min (ticks); |
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206 if (r < 10/60/24) |
| 8112 | 207 ## minutes and seconds |
| 208 form = 13; | |
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209 elseif (r < 2) |
| 8112 | 210 ## hours |
| 211 form = 15; | |
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212 elseif (r < 15) |
| 8112 | 213 ## days |
| 214 form = 8; | |
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215 elseif (r < 365) |
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216 ## FIXME: FORM should be 19 for European users who use dd/mm |
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217 ## instead of mm/dd. How can that be determined automatically? |
| 8112 | 218 ## months |
| 219 form = 6; | |
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220 elseif (r < 90*12) |
| 8112 | 221 ## quarters |
| 222 form = 27; | |
| 223 else | |
| 224 ## years | |
| 225 form = 10; | |
| 226 endif | |
| 227 endif | |
| 228 | |
| 229 if (length (ticks) == 6) | |
| 230 ## Careful that its not treated as a datevec | |
| 231 if (! isempty (startdate)) | |
| 232 sticks = strvcat (datestr (ticks(1:end-1) - ticks(1) + startdate, form), | |
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233 datestr (ticks(end) - ticks(1) + startdate, form)); |
| 8112 | 234 else |
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235 sticks = strvcat (datestr (ticks(1:end-1), form), |
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236 datestr (ticks(end), form)); |
| 8112 | 237 endif |
| 238 else | |
| 239 if (! isempty (startdate)) | |
| 240 sticks = datestr (ticks - ticks(1) + startdate, form); | |
| 241 else | |
| 242 sticks = datestr (ticks, form); | |
| 243 endif | |
| 244 endif | |
| 245 | |
| 246 sticks = mat2cell (sticks, ones (rows (sticks), 1), columns (sticks)); | |
| 247 | |
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248 if (keepticks) |
| 8112 | 249 if (keeplimits) |
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250 set (gca (), [ax "ticklabel"], sticks); |
| 8112 | 251 else |
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252 set (gca (), [ax "ticklabel"], sticks, |
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253 [ax "lim"], [min(ticks), max(ticks)]); |
| 8112 | 254 endif |
| 255 else | |
| 256 if (keeplimits) | |
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257 set (gca (), [ax "tick"], ticks, [ax "ticklabel"], sticks); |
| 8112 | 258 else |
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259 set (gca (), [ax "tick"], ticks, [ax "ticklabel"], sticks, |
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260 [ax "lim"], [min(ticks), max(ticks)]); |
| 8112 | 261 endif |
| 262 endif | |
| 263 endfunction | |
| 264 | |
| 265 function [a, b] = __magform__ (x) | |
| 266 if (x == 0) | |
| 267 a = 0; | |
| 268 b = 0; | |
| 269 else | |
| 270 l = log10 (abs (x)); | |
| 271 r = fmod (l, 1); | |
| 272 a = 10 .^ r; | |
| 273 b = fix (l - r); | |
| 274 if (a < 1) | |
| 275 a *= 10; | |
| 276 b -= 1; | |
| 277 endif | |
| 278 if (x < 0) | |
| 279 a = -a; | |
| 280 endif | |
| 281 endif | |
| 282 endfunction | |
| 283 | |
| 284 ## A translation from Tom Holoryd's python code at | |
| 285 ## http://kurage.nimh.nih.gov/tomh/tics.py | |
| 286 function sep = __calc_tick_sep__ (lo, hi) | |
| 287 persistent sqrt_2 = sqrt (2.0); | |
| 288 persistent sqrt_10 = sqrt (10.0); | |
| 289 persistent sqrt_50 = sqrt (50.0); | |
| 290 | |
| 291 ticint = 5; | |
| 292 | |
| 293 ## Reference: Lewart, C. R., "Algorithms SCALE1, SCALE2, and | |
| 294 ## SCALE3 for Determination of Scales on Computer Generated | |
| 295 ## Plots", Communications of the ACM, 10 (1973), 639-640. | |
| 296 ## Also cited as ACM Algorithm 463. | |
| 297 | |
| 298 [a, b] = __magform__ ((hi - lo) / ticint); | |
| 299 | |
| 300 if (a < sqrt_2) | |
| 301 x = 1; | |
| 302 elseif (a < sqrt_10) | |
| 303 x = 2; | |
| 304 elseif (a < sqrt_50) | |
| 305 x = 5; | |
| 306 else | |
| 307 x = 10; | |
| 308 endif | |
| 309 sep = x * 10 .^ b; | |
| 310 endfunction | |
| 311 |