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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
!
! Does a series of 3-d plots for a given data set, with different
! viewing options in each plot.
!--------------------------------------------------------------------------
program x18f
use plplot, double_PI => PL_PI, double_TWOPI => PL_TWOPI
implicit none
real(kind=pl_test_flt), parameter :: PI = double_PI
real(kind=pl_test_flt), parameter :: TWOPI = double_TWOPI
integer, parameter :: NPTS = 1000
integer :: i, k
real(kind=pl_test_flt), dimension(NPTS) :: x, y, z, r
character(len=80) :: title
integer :: opt(4) = (/ 1, 0, 1, 0 /)
real(kind=pl_test_flt) :: alt(4) = (/ 20.0_pl_test_flt, 35.0_pl_test_flt, 50.0_pl_test_flt, 65.0_pl_test_flt /)
real(kind=pl_test_flt) :: az(4) = (/ 30.0_pl_test_flt, 40.0_pl_test_flt, 50.0_pl_test_flt, 60.0_pl_test_flt /)
integer, dimension(NPTS) :: ia = (/(i,i=1,NPTS)/)
integer :: plparseopts_rc
! Process command-line arguments
plparseopts_rc = plparseopts(PL_PARSE_FULL)
if(plparseopts_rc .ne. 0) stop "plparseopts error"
! Initialize plplot
call plinit()
do k = 1, 4
call test_poly(k, alt(k), az(k))
enddo
! From the mind of a sick and twisted physicist...
z = -1._pl_test_flt + 2._pl_test_flt * real(ia-1,kind=pl_test_flt) / real(NPTS,kind=pl_test_flt)
! Pick one ...
! r = 1. - real(ia-1,kind=pl_test_flt) / real(NPTS,kind=pl_test_flt)
r = z
x = r * cos( 2._pl_test_flt * PI * 6._pl_test_flt * real(ia-1,kind=pl_test_flt) / real(NPTS,kind=pl_test_flt) )
y = r * sin( 2._pl_test_flt * PI * 6._pl_test_flt * real(ia-1,kind=pl_test_flt) / real(NPTS,kind=pl_test_flt) )
do k = 1, 4
call pladv(0)
call plvpor(0.0_pl_test_flt, 1.0_pl_test_flt, 0.0_pl_test_flt, 0.9_pl_test_flt)
call plwind(-1.0_pl_test_flt, 1.0_pl_test_flt, -0.9_pl_test_flt, 1.1_pl_test_flt)
call plcol0(1)
call plw3d(1.0_pl_test_flt, 1.0_pl_test_flt, 1.0_pl_test_flt, &
-1.0_pl_test_flt, 1.0_pl_test_flt, -1.0_pl_test_flt, &
1.0_pl_test_flt, -1.0_pl_test_flt, 1.0_pl_test_flt, &
alt(k), az(k))
call plbox3('bnstu', 'x axis', 0.0_pl_test_flt, 0, &
'bnstu', 'y axis', 0.0_pl_test_flt, 0, &
'bcdmnstuv', 'z axis', 0.0_pl_test_flt, 0)
call plcol0(2)
if ( opt(k).gt. 0 ) then
call plline3(x, y, z)
else
!U+22C5 DOT OPERATOR.
call plstring3( x, y, z, "⋅" )
endif
call plcol0(3)
write( title, '(a,i2,a,i2)') '#frPLplot Example 18 - Alt=', nint(alt(k)), ', Az=', nint(az(k))
call plmtex('t', 1.0_pl_test_flt, 0.5_pl_test_flt, 0.5_pl_test_flt, title)
enddo
call plend()
contains
subroutine test_poly(k, alt, az)
integer :: k
real(kind=pl_test_flt) :: alt, az
real(kind=pl_test_flt) :: x(5), y(5), z(5)
integer :: i, j
logical :: draw(4,4) = &
reshape( &
(/ .true., .true., .true., .true., &
.true., .false., .true., .false., &
.false., .true., .false., .true., &
.true., .true., .false., .false. /), (/4,4/) )
integer, dimension(0:20) :: ia = (/(j,j=0,20)/)
real(kind=pl_test_flt), dimension(0:20) :: theta, phi
theta = TWOPI * ia /20._pl_test_flt
phi = PI * ia / 20.1_pl_test_flt
call pladv(0)
call plvpor(0.0_pl_test_flt, 1.0_pl_test_flt, 0.0_pl_test_flt, 0.9_pl_test_flt)
call plwind(-1.0_pl_test_flt, 1.0_pl_test_flt, -0.9_pl_test_flt, 1.1_pl_test_flt)
call plcol0(1)
call plw3d(1.0_pl_test_flt, 1.0_pl_test_flt, 1.0_pl_test_flt, &
-1.0_pl_test_flt, 1.0_pl_test_flt, -1.0_pl_test_flt, &
1.0_pl_test_flt, -1.0_pl_test_flt, 1.0_pl_test_flt, &
alt, az)
call plbox3('bnstu', 'x axis', 0.0_pl_test_flt, 0, &
'bnstu', 'y axis', 0.0_pl_test_flt, 0, &
'bcdmnstuv', 'z axis', 0.0_pl_test_flt, 0)
call plcol0(2)
! x = r sin(phi) cos(theta)
! y = r sin(phi) sin(theta)
! z = r cos(phi)
! r = 1 :=)
do i=0,19
do j=0,19
x(1) = sin( phi(j) ) * cos( theta(i) )
y(1) = sin( phi(j) ) * sin( theta(i) )
z(1) = cos( phi(j) )
x(2) = sin( phi(j+1) ) * cos( theta(i) )
y(2) = sin( phi(j+1) ) * sin( theta(i) )
z(2) = cos( phi(j+1) )
x(3) = sin( phi(j+1) ) * cos( theta(i+1) )
y(3) = sin( phi(j+1) ) * sin( theta(i+1) )
z(3) = cos( phi(j+1) )
x(4) = sin( phi(j) ) * cos( theta(i+1) )
y(4) = sin( phi(j) ) * sin( theta(i+1) )
z(4) = cos( phi(j) )
x(5) = sin( phi(j) ) * cos( theta(i) )
y(5) = sin( phi(j) ) * sin( theta(i) )
z(5) = cos( phi(j) )
call plpoly3(x, y, z, draw(:,k), .true.)
enddo
enddo
call plcol0(3)
call plmtex('t', 1.0_pl_test_flt, 0.5_pl_test_flt, 0.5_pl_test_flt, 'unit radius sphere' )
end subroutine test_poly
end program x18f
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