/usr/share/doc/libplplot11/examples/f95/x18f.f90 is in libplplot-dev 5.9.9-2ubuntu2.
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!
! Copyright (C) 2004 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
!--------------------------------------------------------------------------
! main
!
! Does a series of 3-d plots for a given data set, with different
! viewing options in each plot.
!--------------------------------------------------------------------------
program x18f
use plplot, PI => PL_PI
implicit none
integer NPTS
parameter ( NPTS = 1000 )
integer i, j, k
real(kind=plflt) x(NPTS), y(NPTS), z(NPTS)
real(kind=plflt) r
character*80 title
integer opt(4)
real(kind=plflt) alt(4)
real(kind=plflt) az(4)
data opt / 1, 0, 1, 0 /
data alt / 20.0_plflt, 35.0_plflt, 50.0_plflt, 65.0_plflt /
data az / 30.0_plflt, 40.0_plflt, 50.0_plflt, 60.0_plflt /
! Process command-line arguments
call plparseopts(PL_PARSE_FULL)
! 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...
do i = 1,NPTS
z(i) = -1._plflt + 2._plflt * dble (i-1) / dble (NPTS)
! Pick one ...
! r = 1. - dble (i-1) / dble (NPTS)
r = z(i)
x(i) = r * cos( 2._plflt * PI * 6._plflt * dble (i-1) / dble (NPTS) )
y(i) = r * sin( 2._plflt * PI * 6._plflt * dble (i-1) / dble (NPTS) )
enddo
do k = 1, 4
call pladv(0)
call plvpor(0.0_plflt, 1.0_plflt, 0.0_plflt, 0.9_plflt)
call plwind(-1.0_plflt, 1.0_plflt, -0.9_plflt, 1.1_plflt)
call plcol0(1)
call plw3d(1.0_plflt, 1.0_plflt, 1.0_plflt, &
-1.0_plflt, 1.0_plflt, -1.0_plflt, &
1.0_plflt, -1.0_plflt, 1.0_plflt, &
alt(k), az(k))
call plbox3('bnstu', 'x axis', 0.0_plflt, 0, &
'bnstu', 'y axis', 0.0_plflt, 0, &
'bcdmnstuv', 'z axis', 0.0_plflt, 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_plflt, 0.5_plflt, 0.5_plflt, &
title)
enddo
call plend()
end
subroutine test_poly(k, alt, az)
use plplot, PI => PL_PI, TWOPI => PL_TWOPI
implicit none
integer k
real(kind=plflt) alt, az
real(kind=plflt) x(5), y(5), z(5)
integer i, j
logical draw(4,4)
DATA draw / &
.true., .true., .true., .true., &
.true., .false., .true., .false., &
.false., .true., .false., .true., &
.true., .true., .false., .false. /
real(kind=plflt) theta, phi
integer ia
THETA(ia) = (TWOPI * (ia) /20._plflt)
PHI(ia) = (PI * (ia) / 20.1_plflt)
call pladv(0)
call plvpor(0.0_plflt, 1.0_plflt, 0.0_plflt, 0.9_plflt)
call plwind(-1.0_plflt, 1.0_plflt, -0.9_plflt, 1.1_plflt)
call plcol0(1)
call plw3d(1.0_plflt, 1.0_plflt, 1.0_plflt, &
-1.0_plflt, 1.0_plflt, -1.0_plflt, &
1.0_plflt, -1.0_plflt, 1.0_plflt, &
alt, az)
call plbox3('bnstu', 'x axis', 0.0_plflt, 0, &
'bnstu', 'y axis', 0.0_plflt, 0, &
'bcdmnstuv', 'z axis', 0.0_plflt, 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_plflt, 0.5_plflt, 0.5_plflt, &
'unit radius sphere' )
return
end
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