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c
c Sample plots using date / time formatting for axes
c
c Copyright (C) 2008 Andrew Ross
c
c This file is part of PLplot.
c
c PLplot is free software; you can redistribute it and/or modify
c it under the terms of the GNU Library General Public License as
c published by the Free Software Foundation; either version 2 of the
c License, or (at your option) any later version.
c
c PLplot is distributed in the hope that it will be useful,
c but WITHOUT ANY WARRANTY; without even the implied warranty of
c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
c GNU Library General Public License for more details.
c
c You should have received a copy of the GNU Library General Public
c License along with PLplot; if not, write to the Free Software
c Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
c
program x29f
implicit none
include 'plplot_parameters.h'
real*8 x(365), y(365), xerr1(365), xerr2(365), yerr1(365),
& yerr2(365)
common /plotdat/ x, y, xerr1, xerr2, yerr1, yerr2
call plparseopts(PL_PARSE_FULL)
call plinit()
c This is the ASCII value for character @
call plsesc(64)
call plot1()
call plot2()
call plot3()
call plot4()
call plend()
end
c====================================================================
c
c Plot a model diurnal cycle of temperature
c
subroutine plot1()
implicit none
include 'plplot_parameters.h'
real*8 x(365), y(365), xerr1(365), xerr2(365), yerr1(365),
& yerr2(365)
common /plotdat/ x, y, xerr1, xerr2, yerr1, yerr2
integer i, npts
real*8 xmin, xmax, ymin, ymax
parameter(npts = 73)
parameter(xmin = 0.0d0)
parameter(xmax = 60.0d0*60.0d0*24.0d0)
parameter(ymin = 10.0d0)
parameter(ymax = 20.0d0)
do i = 1,npts
x(i) = xmax*(dble(i-1)/dble(npts))
y(i) = 15.0d0 - 5.0d0*cos(2.0d0*PI*dble(i-1)/dble(npts))
c Set x error bars to +/- 5 minute
xerr1(i) = x(i)-60.0d0*5.0d0
xerr2(i) = x(i)+60.0d0*5.0d0
c Set y error bars to +/- 0.1 deg C
yerr1(i) = y(i)-0.1d0
yerr2(i) = y(i)+0.1d0
enddo
call pladv(0)
c Rescale major ticks marks by 0.5
call plsmaj(0.0d0,0.5d0)
c Rescale minor ticks and error bar marks by 0.5
call plsmin(0.0d0,0.5d0)
call plvsta()
call plwind(xmin, xmax, ymin, ymax)
c Draw a box with ticks spaced every 3 hour in X and 1 degree C in Y.
call plcol0(1)
c Set time format to be hours:minutes
call pltimefmt("%H:%M")
call plbox("bcnstd", 3.0d0*60.0d0*60.0d0, 3, "bcnstv", 1.0d0, 5)
call plcol0(3)
call pllab("Time (hours:mins)", "Temperature (degC)",
& "@frPLplot Example 29 - Daily temperature")
call plcol0(4)
call plline(npts, x, y)
call plcol0(2)
call plerrx(npts, xerr1, xerr2, y)
call plcol0(3)
call plerry(npts, x, yerr1, yerr2)
c Rescale major / minor tick marks back to default
call plsmin(0.0d0,1.0d0)
call plsmaj(0.0d0,1.0d0)
end
c
c Plot the number of hours of daylight as a function of day for a year
c
subroutine plot2()
implicit none
include 'plplot_parameters.h'
integer j, npts
real*8 xmin, xmax, ymin, ymax
real*8 lat, p, d
real*8 x(365), y(365), xerr1(365), xerr2(365), yerr1(365),
& yerr2(365)
common /plotdat/ x, y, xerr1, xerr2, yerr1, yerr2
c Latitude for London
parameter (lat = 51.5d0)
parameter (npts = 365)
parameter(xmin = 0.0d0)
parameter(xmax = npts*60.0d0*60.0d0*24.0d0)
parameter(ymin = 0)
parameter(ymax = 24)
c Formula for hours of daylight from
c "A Model Comparison for Daylength as a Function of Latitude and
c Day of the Year", 1995, Ecological Modelling, 80, pp 87-95.
do j=1,npts
x(j) = (j-1)*60.0d0*60.0d0*24.0d0
p = asin(0.39795d0*cos(0.2163108d0 + 2.0d0*atan(0.9671396d0*
& tan(0.00860d0*(j-187)))))
d = 24.0d0 - (24.0d0/PI)*
& acos( (sin(0.8333d0*PI/180.0d0) + sin(lat*PI/180.0d0)*
& sin(p)) / (cos(lat*PI/180.0d0)*cos(p)) )
y(j) = d
enddo
call plcol0(1)
c Set time format to be abbreviated month name followed by day of month
call pltimefmt("%b %d")
call plprec(1,1)
call plenv(xmin, xmax, ymin, ymax, 0, 40)
call plcol0(3)
call pllab("Date", "Hours of daylight",
& "@frPLplot Example 29 - Hours of daylight at 51.5N")
call plcol0(4)
call plline(npts, x, y)
call plprec(0,0)
end
c
c
c
subroutine plot3()
implicit none
include 'plplot_parameters.h'
integer i, npts
real*8 xmin, xmax, ymin, ymax
integer tstart, t1, t2
real*8 toff
real*8 x(365), y(365), xerr1(365), xerr2(365), yerr1(365),
& yerr2(365)
common /plotdat/ x, y, xerr1, xerr2, yerr1, yerr2
c integer tm(9)
parameter (npts = 62)
c number of seconds elapsed since the Unix epoch (1970-01-01, UTC) for
c 2005-12-01, UTC. This is the same result as the Python
c calendar.timegm((2005,12,1,0,0,0)) result or the Linux C timegm
c result corresponding to 2005-12-01.
tstart = 1133395200
xmin = dble(tstart)
xmax = xmin + npts*60.0d0*60.0d0*24.0d0
ymin = 0.0d0
ymax = 5.0d0
do i=1,npts
x(i) = xmin + dble(i-1)*60.0d0*60.0d0*24.0d0
y(i) = 1.0d0 + sin( 2.0d0*PI*dble(i-1)/7.0d0) +
& exp( dble(min(i-1,npts+1-i)) / 31.0d0)
enddo
call pladv(0)
call plvsta()
call plwind(xmin, xmax, ymin, ymax)
call plcol0(1)
c Set time format to be ISO 8601 standard YYYY-MM-DD. Note that this is
c equivalent to %f for C99 compliant implementations of strftime.
call pltimefmt("%Y-%m-%d")
c Draw a box with ticks spaced every 14 days in X and 1 hour in Y.
call plbox("bcnstd", 14.0d0*24.0d0*60.0d0*60.0d0,14, "bcnstv",
& 1.0d0, 4)
call plcol0(3)
call pllab("Date", "Hours of television watched",
& "@frPLplot Example 29 - Hours of television watched in " //
& "Dec 2005 / Jan 2006")
call plcol0(4)
call plssym(0.0d0,0.5d0)
call plpoin(npts, x, y, 2)
call plline(npts, x, y)
end
c
c
c
subroutine plot4()
implicit none
c TAI-UTC (seconds) as a function of time.
c Use Besselian epochs as the continuous time interval just to prove
c this does not introduce any issues.
real*8 scale, offset1, offset2
real*8 xmin, xmax, ymin, ymax, xlabel_step
integer kind, npts, i
logical if_TAI_time_format
character*10 time_format
character*100 title_suffix
character*100 xtitle
character*100 title
real*8 x(1001), y(1001)
integer tai_year, tai_month, tai_day, tai_hour, tai_min
real*8 tai_sec, tai
integer utc_year, utc_month, utc_day, utc_hour, utc_min
real*8 utc_sec, utc
integer lnblnk
c Use the definition given in http://en.wikipedia.org/wiki/Besselian_epoch
c B = 1900. + (JD -2415020.31352)/365.242198781
c ==> (as calculated with aid of "bc -l" command)
c B = (MJD + 678940.364163900)/365.242198781
c ==>
c MJD = B*365.24219878 - 678940.364163900
scale = 365.242198781d0
offset1 = -678940.0d0
offset2 = -0.3641639d0
call plconfigtime(scale, offset1, offset2, z'0', 0, 0, 0, 0, 0,
1 0, 0.d0)
do kind = 0,6
if (kind .eq. 0) then
call plctime(1950,0,2,0,0,0.d0,xmin)
call plctime(2020,0,2,0,0,0.d0,xmax)
npts = 70*12 + 1
ymin = 0.0d0
ymax = 36.0d0
time_format="%Y%"
if_TAI_time_format = .true.
title_suffix = "from 1950 to 2020"
xtitle = "Year"
xlabel_step = 10.0d0
elseif ((kind .eq. 1) .or. (kind .eq. 2)) then
call plctime(1961,7,1,0,0,1.64757d0-.20d0, xmin)
call plctime(1961,7,1,0,0,1.64757d0+.20d0, xmax)
npts = 1001
ymin = 1.625d0
ymax = 1.725d0
time_format = "%S%2%"
title_suffix = "near 1961-08-01 (TAI)"
xlabel_step = 0.05d0/(scale*86400.0d0)
if (kind .eq. 1) then
if_TAI_time_format = .true.
xtitle = "Seconds (TAI)"
else
if_TAI_time_format = .false.
xtitle = "Seconds (TAI) labelled with corresponding UTC"
endif
elseif ((kind .eq. 3) .or. (kind .eq. 4)) then
call plctime(1963,10,1,0,0,2.6972788d0-.20d0, xmin)
call plctime(1963,10,1,0,0,2.6972788d0+.20d0, xmax)
npts = 1001
ymin = 2.55d0
ymax = 2.75d0
time_format = "%S%2%"
title_suffix = "near 1963-11-01 (TAI)"
xlabel_step = 0.05d0/(scale*86400.0d0)
if (kind .eq. 3) then
if_TAI_time_format = .true.
xtitle = "Seconds (TAI)"
else
if_TAI_time_format = .false.
xtitle = "Seconds (TAI) labelled with corresponding UTC"
endif
elseif ((kind .eq. 5) .or. (kind .eq. 6)) then
call plctime(2009,0,1,0,0,34.d0-5.d0,xmin)
call plctime(2009,0,1,0,0,34.d0+5.d0,xmax)
npts = 1001
ymin = 32.5d0
ymax = 34.5d0
time_format = "%S%2%"
title_suffix = "near 2009-01-01 (TAI)"
xlabel_step = 1.d0/(scale*86400.d0)
if (kind .eq. 5) then
if_TAI_time_format = .true.
xtitle = "Seconds (TAI)"
else
if_TAI_time_format = .false.
xtitle = "Seconds (TAI) labelled with corresponding UTC"
endif
endif
do i=0,npts-1
x(i+1) = xmin + i*(xmax-xmin)/(dble(npts-1))
call plconfigtime(scale, offset1, offset2, z'0', 0, 0, 0, 0,
1 0, 0, 0.d0)
tai = x(i+1)
call plbtime(tai_year, tai_month, tai_day, tai_hour,
1 tai_min, tai_sec, tai)
call plconfigtime(scale, offset1, offset2, z'2', 0, 0, 0,
1 0, 0, 0, 0.d0)
call plbtime(utc_year, utc_month, utc_day, utc_hour,
1 utc_min, utc_sec, tai)
call plconfigtime(scale, offset1, offset2, z'0', 0, 0, 0,
1 0, 0, 0, 0.d0)
call plctime(utc_year, utc_month, utc_day, utc_hour,
1 utc_min, utc_sec, utc)
y(i+1)=(tai-utc)*scale*86400.d0
enddo
call pladv(0)
call plvsta()
call plwind(xmin, xmax, ymin, ymax)
call plcol0(1)
if (if_TAI_time_format) then
call plconfigtime(scale, offset1, offset2, z'0', 0, 0, 0,
1 0, 0, 0, 0.d0)
else
call plconfigtime(scale, offset1, offset2, z'2', 0, 0, 0,
1 0, 0, 0, 0.d0)
endif
call pltimefmt(time_format)
call plbox("bcnstd", xlabel_step, 0, "bcnstv", 0.d0, 0)
call plcol0(3)
title = "@frPLplot Example 29 - TAI-UTC "//
1 title_suffix(:lnblnk(title_suffix))
call pllab(xtitle, "TAI-UTC (sec)", title)
call plcol0(4)
call plline(npts, x, y)
enddo
end
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