1 ## Copyright (C) 2008-2012 David Bateman
3 ## This file is part of Octave.
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.
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.
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/>.
20 ## @deftypefn {Function File} {} datetick ()
21 ## @deftypefnx {Function File} {} datetick (@var{form})
22 ## @deftypefnx {Function File} {} datetick (@var{axis}, @var{form})
23 ## @deftypefnx {Function File} {} datetick (@dots{}, "keeplimits")
24 ## @deftypefnx {Function File} {} datetick (@dots{}, "keepticks")
25 ## @deftypefnx {Function File} {} datetick (@dots{ax}, @dots{})
26 ## Add date formatted tick labels to an axis. The axis the apply the
27 ## ticks to is determined by @var{axis} that can take the values "x",
28 ## "y" or "z". The default value is "x". The formatting of the labels is
29 ## determined by the variable @var{form}, that can either be a string in
30 ## the format needed by @code{dateform}, or a positive integer that can
31 ## be accepted by @code{datestr}.
32 ## @seealso{datenum, datestr}
35 function datetick (varargin)
37 [h, varargin, nargin] = __plt_get_axis_arg__ ("datetick", varargin{:});
42 __datetick__ (varargin{:});
43 unwind_protect_cleanup
51 %! pop = [76.094, 92.407, 106.461, 123.077 131.954, 151.868, 179.979, ...
52 %! 203.984, 227.225, 249.623, 282.224];
53 %! plot (datenum (yr, 1, 1), pop);
54 %! title ("US population (millions)");
56 %! datetick ("x", "YYYY");
60 %! yr =datenum(yr,1,1);
61 %! pr = [12.1 13.3 12.6 13.1 13.3 14.1 14.4 15.2];
64 %! ylabel('average price')
66 %! set(ax,'xtick',datenum(1990:5:2005,1,1))
67 %! datetick(2,'keepticks')
68 %! set(ax,'ytick',12:16)
70 ## Remove from test statistics. No real tests possible.
73 function __datetick__ (varargin)
81 if (strcmpi (arg, "keeplimits"))
84 elseif (strcmpi (arg, "keepticks"))
92 nargin = length (varargin);
98 if (ischar (arg) && (strcmp (arg, "x") || strcmp (arg, "y")
99 || strcmp (arg, "z")))
113 ## Don't publish the existence of this variable for use with dateaxis
114 if (length (varargin) > 0)
115 startdate = varargin{1};
120 if (! isempty (form))
121 if (isnumeric (form))
122 if (! isscalar (form) || floor (form) != form || form < 0)
123 error ("datetick: expecting FORM argument to be a positive integer");
125 elseif (! ischar (form))
126 error ("datetick: expecting valid date format string");
131 ticks = get (gca (), strcat (ax, "tick"));
133 ## Need to do our own axis tick position calculation as
134 ## year, etc, don't fallback on nice datenum values.
135 objs = findall (gca());
138 for i = 1 : length (objs)
139 fld = get (objs (i));
140 if (isfield (fld, strcat (ax, "data")))
141 xdata = getfield (fld, strcat (ax, "data"))(:);
142 xmin = min (xmin, min (xdata));
143 xmax = max (xmax, max (xdata));
147 if (isnan (xmin) || isnan (xmax))
150 elseif (xmin == xmax)
157 if (xmax - xmin < N / 24 / 60 / 60)
158 scl = 1 / 24 / 60 / 60;
159 elseif (xmax - xmin < N / 24 / 6)
164 sep = __calc_tick_sep__ (xmin / scl , xmax / scl);
165 xmin = sep * floor (xmin / scl / sep);
166 xmax = sep * ceil (xmax / scl / sep);
167 nticks = (xmax - xmin) / sep + 1;
171 [ymin, mmin, dmin] = datevec (xmin);
172 [ymax, mmax, dmax] = datevec (xmax);
173 minyear = ymin + (mmin - 1) / 12 + (dmin - 1) / 12 / 30;
174 maxyear = ymax + (mmax - 1) / 12 + (dmax - 1) / 12 / 30;
175 minmonth = mmin + (dmin - 1) / 30;
176 maxmonth = (ymax - ymin) * 12 + mmax + (dmax - 1) / 30;
178 if (maxmonth - minmonth < N)
179 sep = __calc_tick_sep__ (xmin, xmax);
180 xmin = sep * floor (xmin / sep);
181 xmax = sep * ceil (xmax / sep);
182 nticks = (xmax - xmin) / sep + 1;
183 elseif (maxyear - minyear < N)
184 sep = __calc_tick_sep__ (minmonth , maxmonth);
185 xmin = datenum (ymin, sep * floor (minmonth / sep), 1);
186 xmax = datenum (ymin, sep * ceil (maxmonth / sep), 1);
187 nticks = ceil (maxmonth / sep) - floor (minmonth / sep) + 1;
189 sep = __calc_tick_sep__ (minyear , maxyear);
190 xmin = datenum (sep * floor (minyear / sep), 1, 1);
191 xmax = datenum (sep * ceil (maxyear / sep), 1, 1);
192 nticks = ceil (maxyear / sep) - floor (minyear / sep) + 1;
195 ticks = xmin + [0 : nticks - 1] / (nticks - 1) * (xmax - xmin);
199 r = max(ticks) - min(ticks);
201 ## minutes and seconds
210 ## FIXME -- FORM should be 19 for European users who use dd/mm
211 ## instead of mm/dd. How can that be determined automatically?
223 if (length (ticks) == 6)
224 ## Careful that its not treated as a datevec
225 if (! isempty (startdate))
226 sticks = strvcat (datestr (ticks(1:end-1) - ticks(1) + startdate, form),
227 datestr (ticks(end) - ticks(1) + startdate, form));
229 sticks = strvcat (datestr (ticks(1:end-1), form),
230 datestr (ticks(end), form));
233 if (! isempty (startdate))
234 sticks = datestr (ticks - ticks(1) + startdate, form);
236 sticks = datestr (ticks, form);
240 sticks = mat2cell (sticks, ones (rows (sticks), 1), columns (sticks));
244 set (gca(), strcat (ax, "ticklabel"), sticks);
246 set (gca(), strcat (ax, "ticklabel"), sticks, strcat (ax, "lim"),
247 [min(ticks), max(ticks)]);
251 set (gca(), strcat (ax, "tick"), ticks, strcat (ax, "ticklabel"), sticks);
253 set (gca(), strcat (ax, "tick"), ticks, strcat (ax, "ticklabel"), sticks,
254 strcat (ax, "lim"), [min(ticks), max(ticks)]);
259 function [a, b] = __magform__ (x)
278 ## A translation from Tom Holoryd's python code at
279 ## http://kurage.nimh.nih.gov/tomh/tics.py
280 function sep = __calc_tick_sep__ (lo, hi)
281 persistent sqrt_2 = sqrt (2.0);
282 persistent sqrt_10 = sqrt (10.0);
283 persistent sqrt_50 = sqrt (50.0);
287 ## Reference: Lewart, C. R., "Algorithms SCALE1, SCALE2, and
288 ## SCALE3 for Determination of Scales on Computer Generated
289 ## Plots", Communications of the ACM, 10 (1973), 639-640.
290 ## Also cited as ACM Algorithm 463.
292 [a, b] = __magform__ ((hi - lo) / ticint);