/usr/share/doc/libplplot11/examples/f95/x25f.f90 is in libplplot-dev 5.9.9-2ubuntu2.
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!
! Filling and clipping polygons.
!
! Copyright (C) 2005 Arjen Markus
! Copyright (C) 2008 Andrew Ross
!
! 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
!
! Test program for filling polygons and proper clipping
! --------------------------------------------------------------------------
program x25f
use plplot
implicit none
integer i, j, k
integer npts
real(kind=plflt) xextreme(2,10)
real(kind=plflt) yextreme(2,10)
real(kind=plflt) x0(10)
real(kind=plflt) y0(10)
data ( xextreme(1,i), xextreme(2,i), yextreme(1,i), yextreme(2,i), &
i=1,9) / &
-120.0_plflt, 120.0_plflt, -120.0_plflt, 120.0_plflt, &
-120.0_plflt, 120.0_plflt, 20.0_plflt, 120.0_plflt, &
-120.0_plflt, 120.0_plflt, -20.0_plflt, 120.0_plflt, &
-80.0_plflt, 80.0_plflt, -20.0_plflt, 120.0_plflt, &
-220.0_plflt, -120.0_plflt, -120.0_plflt, 120.0_plflt, &
-20.0_plflt, 20.0_plflt, -120.0_plflt, 120.0_plflt, &
-20.0_plflt, 20.0_plflt, -20.0_plflt, 20.0_plflt, &
-80.0_plflt, 80.0_plflt, -80.0_plflt, 80.0_plflt, &
20.0_plflt, 120.0_plflt, -120.0_plflt, 120.0_plflt/
npts = 0
! Parse and process command line arguments
call plparseopts(PL_PARSE_FULL)
! Initialize plplot
call plssub(3,3)
call plinit()
do k = 1,2
do j = 1,4
if ( j .eq. 1 ) then
! Polygon 1: a diamond
x0(1) = 0.0_plflt
y0(1) = -100.0_plflt
x0(2) = -100.0_plflt
y0(2) = 0.0_plflt
x0(3) = 0.0_plflt
y0(3) = 100.0_plflt
x0(4) = 100.0_plflt
y0(4) = 0.0_plflt
npts = 4
endif
if ( j .eq. 2 ) then
! Polygon 1: a diamond - reverse direction
x0(4) = 0.0_plflt
y0(4) = -100.0_plflt
x0(3) = -100.0_plflt
y0(3) = 0.0_plflt
x0(2) = 0.0_plflt
y0(2) = 100.0_plflt
x0(1) = 100.0_plflt
y0(1) = 0.0_plflt
npts = 4
endif
if ( j .eq. 3 ) then
! Polygon 2: a square with punctures
x0(1) = -100.0_plflt
y0(1) = -100.0_plflt
x0(2) = -100.0_plflt
y0(2) = -80.0_plflt
x0(3) = 80.0_plflt
y0(3) = 0.0_plflt
x0(4) = -100.0_plflt
y0(4) = 80.0_plflt
x0(5) = -100.0_plflt
y0(5) = 100.0_plflt
x0(6) = -80.0_plflt
y0(6) = 100.0_plflt
x0(7) = 0.0_plflt
y0(7) = 80.0_plflt
x0(8) = 80.0_plflt
y0(8) = 100.0_plflt
x0(9) = 100.0_plflt
y0(9) = 100.0_plflt
x0(10) = 100.0_plflt
y0(10) = -100.0_plflt
npts = 10
endif
if ( j .eq. 4 ) then
! Polygon 2: a square with punctures - reversed direction
x0(10) = -100.0_plflt
y0(10) = -100.0_plflt
x0(9) = -100.0_plflt
y0(9) = -80.0_plflt
x0(8) = 80.0_plflt
y0(8) = 0.0_plflt
x0(7) = -100.0_plflt
y0(7) = 80.0_plflt
x0(6) = -100.0_plflt
y0(6) = 100.0_plflt
x0(5) = -80.0_plflt
y0(5) = 100.0_plflt
x0(4) = 0.0_plflt
y0(4) = 80.0_plflt
x0(3) = 80.0_plflt
y0(3) = 100.0_plflt
x0(2) = 100.0_plflt
y0(2) = 100.0_plflt
x0(1) = 100.0_plflt
y0(1) = -100.0_plflt
npts = 10
endif
do i = 1,9
call pladv(0)
call plvsta()
call plwind(xextreme(1,i), xextreme(2,i), &
yextreme(1,i), yextreme(2,i))
call plcol0(2)
call plbox('bc', 1.0d0, 0, 'bcnv', 10.0d0, 0)
call plcol0(1)
call plpsty(0)
if(k.eq.1) then
call plfill(x0(1:npts),y0(1:npts))
else
call plgradient(x0(1:npts),y0(1:npts),45.d0)
endif
call plcol0(2)
call pllsty(1)
call plline(x0(1:npts),y0(1:npts))
end do
end do
end do
! Don't forget to call plend() to finish off!
call plend()
end program x25f
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