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! Copyright (C) 2004-2016 Alan W. Irwin
!
! 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
! N.B. the pl_test_flt parameter used in this code is only
! provided by the plplot module to allow convenient developer
! testing of either kind(1.0) or kind(1.0d0) floating-point
! precision regardless of the floating-point precision of the
! PLplot C libraries. We do not guarantee the value of this test
! parameter so it should not be used by users, and instead user
! code should replace the pl_test_flt parameter by whatever
! kind(1.0) or kind(1.0d0) precision is most convenient for them.
! For further details on floating-point precision issues please
! consult README_precision in this directory.
!
!--------------------------------------------------------------------------
! main program
!--------------------------------------------------------------------------
program x17f
use plplot, double_PI => PL_PI
implicit none
real(kind=pl_test_flt), parameter :: PI = double_PI
integer :: id1, n
integer, parameter :: nsteps = 1000
logical :: autoy, acc
real(kind=pl_test_flt) :: y1, y2, y3, y4, ymin, ymax, xlab, ylab
real(kind=pl_test_flt) :: t, tmin, tmax, tjump, dt, noise
integer :: colbox, collab, colline(4), styline(4)
integer :: plparseopts_rc
character(len=20) :: legline(4)
logical :: pl_errcode
character(len=80) :: errmsg = 'PLplot error'
! Process command-line arguments
plparseopts_rc = plparseopts(PL_PARSE_FULL)
if(plparseopts_rc .ne. 0) stop "plparseopts error"
! plplot initialization
! If db is used the plot is much more smooth. However, because of the
! async X behaviour, one does not have a real-time scripcharter.
!
! call plsetopt('db', '')
! call plsetopt('np', '')
! User sets up plot completely except for window and data
! Eventually settings in place when strip chart is created will be
! remembered so that multiple strip charts can be used simultaneously.
! Specify some reasonable defaults for ymin and ymax
! The plot will grow automatically if needed (but not shrink)
ymin = -0.1_pl_test_flt
ymax = 0.1_pl_test_flt
! Specify initial tmin and tmax -- this determines length of window.
! Also specify maximum jump in t
! This can accomodate adaptive timesteps
tmin = 0._pl_test_flt
tmax = 10._pl_test_flt
! percentage of plot to jump
tjump = 0.3_pl_test_flt
! Axes options same as plbox.
! Only automatic tick generation and label placement allowed
! Eventually I'll make this fancier
colbox = 1
collab = 3
! pens color and line style
styline = (/ 2, 3, 4, 5 /)
colline = (/ 2, 3, 4, 5 /)
! pens legend
legline = (/ 'sum ', 'sin ', 'sin*noi', 'sin+noi' /)
! legend position
xlab = 0._pl_test_flt
ylab = 0.25_pl_test_flt
! autoscale y
autoy = .true.
! don't scrip, accumulate
acc = .true.
! Initialize plplot
call plinit()
call pladv(0)
call plvsta()
! Register our error variables with PLplot
! From here on, we're handling all errors here
! TODO: call plsError(&pl_errcode, errmsg)
call plstripc(id1, 'bcnst', 'bcnstv', &
tmin, tmax, tjump, ymin, ymax, &
xlab, ylab, &
autoy, acc, &
colbox, collab, &
colline, styline, legline, &
't', '', 'Strip chart demo')
pl_errcode = .false.
if ( pl_errcode ) then
write(*,*) errmsg
stop
endif
! Let plplot handle errors from here on
! TODO: call plsError(NULL, NULL)
! autoscale y
autoy = .false.
! accumulate
acc = .true.
! This is to represent a loop over time
! Let's try a random walk process
y1 = 0.0_pl_test_flt
y2 = 0.0_pl_test_flt
y3 = 0.0_pl_test_flt
y4 = 0.0_pl_test_flt
dt = 0.1_pl_test_flt
do n = 0,nsteps-1
! wait a little (10 ms) to simulate time elapsing. gfortran
! sleep has resolution of 1 sec so the call below is commented
! out because it is like watching paint dry. In any case, I
! like the resulting speedier output when you drop sleep
! altogether from this loop.
! call sleep(1)
t = real(n,kind=pl_test_flt) * dt
noise = plrandd() - 0.5_pl_test_flt
y1 = y1 + noise
y2 = sin(t*PI/18._pl_test_flt)
y3 = y2 * noise
y4 = y2 + noise/3._pl_test_flt
! There is no need for all pens to have the same number of
! points or beeing equally time spaced.
if ( mod(n,2) .ne. 0 ) then
call plstripa(id1, 0, t, y1)
endif
if ( mod(n,3) .ne. 0 ) then
call plstripa(id1, 1, t, y2)
endif
if ( mod(n,4) .ne. 0 ) then
call plstripa(id1, 2, t, y3)
endif
if ( mod(n,5) .ne. 0 ) then
call plstripa(id1, 3, t, y4)
endif
! use_ double buffer (-db on command line)
! call pleop()
enddo
! Destroy strip chart and it's memory
call plstripd(id1)
call plend()
end program x17f
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