/usr/share/doc/libplplot12/examples/ada/x29a.adb is in libplplot-ada1-dev 5.10.0+dfsg2-0.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 | -- $Id: x29a.adb 11680 2011-03-27 17:57:51Z airwin $
-- Sample plots using date / time formatting for axes
-- Copyright (C) 2008-2010 Jerry Bauck
-- This file is part of PLplot.
-- PLplot is free software; you can redistribute it and/or modify
-- it under the terms of the GNU Library General Public License as published
-- by the Free Software Foundation; either version 2 of the License, or
-- (at your option) any later version.
-- PLplot is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Library General Public License for more details.
-- You should have received a copy of the GNU Library General Public License
-- along with PLplot; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
with
Ada.Strings.Unbounded,
Ada.Numerics,
Ada.Numerics.Long_Elementary_Functions,
PLplot_Auxiliary,
PLplot_Traditional;
use
Ada.Strings.Unbounded,
Ada.Numerics,
Ada.Numerics.Long_Elementary_Functions,
PLplot_Auxiliary,
PLplot_Traditional;
--------------------------------------------------------------------------------
-- Draws several plots which demonstrate the use of date / time formats for
-- the axis labels.
-- Time formatting is done using the strfqsas routine from the qsastime
-- library. This is similar to strftime, but works for a broad
-- date range even on 32-bit systems. See the
-- documentation of strfqsas for full details of the available formats.
--
-- 1) Plotting temperature over a day (using hours / minutes)
-- 2) Plotting
--
-- Note: We currently use the default call for plconfigtime (done in
-- plinit) which means continuous times are interpreted as seconds since
-- 1970-01-01, but that may change in future, more extended versions of
-- this example.
--------------------------------------------------------------------------------
-- NOTE: The Ada user is reminded that Ada.Calendar is very capable and complete.
-- See especially Time_Of.
procedure x29a is
-- Plot a model diurnal cycle of temperature
procedure plot1 is
x, y : Real_Vector(0 .. 72);
xerr1, xerr2, yerr1, yerr2 : Real_Vector(0 .. 72);
-- Data points every 10 minutes for 1 day
xmin, xmax, ymin, ymax : Long_Float;
begin
xmin := 0.0;
xmax := 60.0 * 60.0 * 24.0; -- Number of seconds in a day
ymin := 10.0;
ymax := 20.0;
for i in x'range loop
x(i) := xmax * Long_Float(i) / Long_Float(x'length);
y(i) := 15.0 - 5.0 * cos( 2.0 * pi * Long_Float(i) / Long_Float(x'length));
-- Set x error bars to +/- 5 minute
xerr1(i) := x(i) - Long_Float(60 * 5);
xerr2(i) := x(i) + Long_Float(60 * 5);
-- Set y error bars to +/- 0.1 deg C */
yerr1(i) := y(i) - 0.1;
yerr2(i) := y(i) + 0.1;
end loop;
pladv(0);
-- Rescale major ticks marks by 0.5
plsmaj(0.0, 0.5);
-- Rescale minor ticks and error bar marks by 0.5
plsmin(0.0, 0.5);
plvsta;
plwind(xmin, xmax, ymin, ymax);
-- Draw a box with ticks spaced every 3 hours in X and 1 degree C in Y.
plcol0(1);
-- Set time format to be hours:minutes
pltimefmt("%H:%M");
plbox("bcnstd", 3.0 * 60.0 * 60.0, 3, "bcnstv", 1.0, 5);
plcol0(3);
pllab("Time (hours:mins)", "Temperature (degC)", "@frPLplot Example 29 - Daily temperature");
plcol0(4);
plline(x, y);
plcol0(2);
plerrx(xerr1, xerr2, y);
plcol0(3);
plerry(x, yerr1, yerr2);
-- Rescale major / minor tick marks back to default
plsmin(0.0, 1.0);
plsmaj(0.0, 1.0);
end plot1;
-- Plot the number of hours of daylight as a function of day for a year
procedure plot2 is
xmin, xmax, ymin, ymax : Long_Float;
lat, p, d : Long_Float;
x, y : Real_Vector(0 .. 364);
begin
-- Latitude for London
lat := 51.5;
xmin := 0.0;
xmax := Long_Float(x'length) * 60.0 * 60.0 * 24.0;
ymin := 0.0;
ymax := 24.0;
-- Formula for hours of daylight from
-- "A Model Comparison for Daylength as a Function of Latitude and
-- Day of the Year", 1995, Ecological Modelling, 80, pp 87-95.
for j in x'range loop
x(j):= Long_Float(j) * 60.0 * 60.0 * 24.0;
p := arcsin(0.39795 * cos(0.2163108 + 2.0 * arctan(0.9671396 * tan(0.00860 * Long_Float(j-186)))));
d := 24.0 - (24.0 / pi) *
arccos((sin(0.8333 * pi / 180.0) + sin(lat * pi / 180.0) * sin(p)) /
(cos(lat * pi / 180.0) * cos(p)));
y(j):= d;
end loop;
plcol0(1);
-- Set time format to be abbreviated month name followed by day of month
pltimefmt("%b %d");
plprec(True, 1);
plenv(xmin, xmax, ymin, ymax, 0, 40);
plcol0(3);
pllab("Date", "Hours of daylight", "@frPLplot Example 29 - Hours of daylight at 51.5N");
plcol0(4);
plline(x, y);
plprec(False, 0);
end plot2;
procedure plot3 is
xmin, xmax, ymin, ymax, tstart : Long_Float;
x, y : Real_Vector(0 .. 61);
begin
-- Calculate continuous time corresponding to 2005-12-01 UTC.
plctime(2005, 11, 01, 0, 0, 0.0, tstart);
xmin := tstart;
xmax := xmin + Long_Float(x'length) * 60.0 * 60.0 * 24.0;
ymin := 0.0;
ymax := 5.0;
for i in x'range loop
x(i) := xmin + Long_Float(i) * 60.0 * 60.0 * 24.0;
y(i) := 1.0 + sin(2.0 * pi * Long_Float(i) / 7.0) +
exp((Long_Float(Integer'min(i, x'length - i))) / 31.0);
end loop;
pladv(0);
plvsta;
plwind(xmin, xmax, ymin, ymax);
plcol0(1);
-- Set time format to be ISO 8601 standard YYYY-MM-DD.
pltimefmt("%F");
-- Draw a box with ticks spaced every 14 days in X and 1 hour in Y.
plbox("bcnstd", 14.0 * 24.0 * 60.0 * 60.0, 14, "bcnstv", 1.0, 4);
plcol0(3);
pllab("Date", "Hours of television watched", "@frPLplot Example 29 - Hours of television watched in Dec 2005 / Jan 2006");
plcol0(4);
-- Rescale symbol size (used by plpoin) by 0.5
plssym(0.0,0.5);
plpoin(x, y, 2);
plline(x, y);
end plot3;
procedure plot4 is
-- TAI-UTC (seconds) as a function of time.
-- Use Besselian epochs as the continuous time interval just to prove
-- this does not introduce any issues.
scale, offset1, offset2 : Long_Float;
xmin, xmax, ymin, ymax, xlabel_step : Long_Float;
npts : Integer;
if_TAI_time_format : Boolean;
time_format : Unbounded_String := To_Unbounded_String("");
title_suffix : Unbounded_String := To_Unbounded_String("");
xtitle : Unbounded_String := To_Unbounded_String("");
title : Unbounded_String := To_Unbounded_String("");
x, y : Real_Vector(0 .. 1000);
tai_year, tai_month, tai_day, tai_hour, tai_min : Integer;
tai_sec, tai : Long_Float;
utc_year, utc_month, utc_day, utc_hour, utc_min : Integer;
utc_sec, utc : Long_Float;
begin
-- Use the definition given in http://en.wikipedia.org/wiki/Besselian_epoch
-- B = 1900. + (JD -2415020.31352)/365.242198781
-- => (as calculated with aid of "bc -l" command)
-- B = (MJD + 678940.364163900)/365.242198781
-- =>
-- MJD = B*365.24219878 - 678940.364163900
scale := 365.242198781;
offset1 := -678940.0;
offset2 := -0.3641639;
plconfigtime(scale, offset1, offset2, 0, False, 0, 0, 0, 0, 0, 0.0);
for kind in 0 .. 6 loop
if kind = 0 then
plctime(1950, 0, 2, 0, 0, 0.0, xmin);
plctime(2020, 0, 2, 0, 0, 0.0, xmax);
npts := 70 * 12 + 1;
ymin := 0.0;
ymax := 36.0;
time_format := To_Unbounded_String("%Y%");
if_TAI_time_format := True;
title_suffix := To_Unbounded_String("from 1950 to 2020");
xtitle := To_Unbounded_String("Year");
xlabel_step := 10.0;
elsif kind = 1 or kind = 2 then
plctime(1961, 7, 1, 0, 0, 1.64757 - 0.20, xmin);
plctime(1961, 7, 1, 0, 0, 1.64757 + 0.20, xmax);
npts := 1001;
ymin := 1.625;
ymax := 1.725;
time_format := To_Unbounded_String("%S%2%");
title_suffix := To_Unbounded_String("near 1961-08-01 (TAI)");
xlabel_step := 0.05 / (scale * 86400.0);
if kind = 1 then
if_TAI_time_format := True;
xtitle := To_Unbounded_String("Seconds (TAI)");
else
if_TAI_time_format := False;
xtitle := To_Unbounded_String("Seconds (TAI) labelled with corresponding UTC");
end if;
elsif kind = 3 or kind = 4 then
plctime(1963, 10, 1, 0, 0, 2.6972788 - 0.20, xmin);
plctime(1963, 10, 1, 0, 0, 2.6972788 + 0.20, xmax);
npts := 1001;
ymin := 2.55;
ymax := 2.75;
time_format := To_Unbounded_String("%S%2%");
title_suffix := To_Unbounded_String("near 1963-11-01 (TAI)");
xlabel_step := 0.05 / (scale * 86400.0);
if kind = 3 then
if_TAI_time_format := True;
xtitle := To_Unbounded_String("Seconds (TAI)");
else
if_TAI_time_format := False;
xtitle := To_Unbounded_String("Seconds (TAI) labelled with corresponding UTC");
end if;
elsif kind = 5 or kind = 6 then
plctime(2009, 0, 1, 0, 0, 34.0 - 5.0, xmin);
plctime(2009, 0, 1, 0, 0, 34.0 + 5.0, xmax);
npts := 1001;
ymin := 32.5;
ymax := 34.5;
time_format := To_Unbounded_String("%S%2%");
title_suffix := To_Unbounded_String("near 2009-01-01 (TAI)");
xlabel_step := 1.0 / (scale * 86400.0);
if kind = 5 then
if_TAI_time_format := True;
xtitle := To_Unbounded_String("Seconds (TAI)");
else
if_TAI_time_format := False;
xtitle := To_Unbounded_String("Seconds (TAI) labelled with corresponding UTC");
end if;
end if;
for i in 0 .. npts - 1 loop
x(i) := xmin + Long_Float(i) * (xmax - xmin) / (Long_Float(npts - 1));
plconfigtime(scale, offset1, offset2, 0, False, 0, 0, 0, 0, 0, 0.0);
tai := x(i);
plbtime(tai_year, tai_month, tai_day, tai_hour, tai_min, tai_sec, tai);
plconfigtime(scale, offset1, offset2, 2, False, 0, 0, 0, 0, 0, 0.0);
plbtime(utc_year, utc_month, utc_day, utc_hour, utc_min, utc_sec, tai);
plconfigtime(scale, offset1, offset2, 0, False, 0, 0, 0, 0, 0, 0.0);
plctime(utc_year, utc_month, utc_day, utc_hour, utc_min, utc_sec, utc);
y(i) := (tai - utc) * scale * 86400.0;
end loop;
pladv(0);
plvsta;
plwind(xmin, xmax, ymin, ymax);
plcol0(1);
if if_TAI_time_format then
plconfigtime(scale, offset1, offset2, 0, False, 0, 0, 0, 0, 0, 0.0);
else
plconfigtime(scale, offset1, offset2, 2, False, 0, 0, 0, 0, 0, 0.0);
end if;
pltimefmt(To_String(time_format));
plbox("bcnstd", xlabel_step, 0, "bcnstv", 0.0, 0);
plcol0(3);
title := To_Unbounded_String("@frPLplot Example 29 - TAI-UTC ");
title := title & title_suffix;
pllab(To_String(xtitle), "TAI-UTC (sec)", To_String(title));
plcol0(4);
if kind = 0 then -- Shorter x and y
plline(x(0 .. 70 * 12), y(0 .. 70 * 12));
else -- Longer x and y
plline(x, y);
end if;
end loop; -- kind
end plot4;
begin -- main
-- Parse command line arguments
plparseopts(PL_PARSE_FULL);
-- Change the escape character to a '@' instead of the default '#'
plsesc('@');
-- Initialize plplot
plinit;
-- Change the escape character to a '@' instead of the default '#'
plsesc('@');
plot1;
plot2;
plot3;
plot4;
-- Don't forget to call plend to finish off!
plend;
end x29a;
|