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! Filling and clipping polygons.
!
! Copyright (C) 2005 Arjen Markus
! Copyright (C) 2008 Andrew Ross
! Copyright (C) 2008-2016 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
!
! Test program for filling polygons and proper clipping
! --------------------------------------------------------------------------
program x25f
use plplot
implicit none
integer :: i, j, k
integer :: npts
integer :: plparseopts_rc
real(kind=pl_test_flt) :: xextreme(2,10)
real(kind=pl_test_flt) :: yextreme(2,10)
real(kind=pl_test_flt) :: x0(10)
real(kind=pl_test_flt) :: y0(10)
data ( xextreme(1,i), xextreme(2,i), yextreme(1,i), yextreme(2,i), i=1,9) / &
-120.0_pl_test_flt, 120.0_pl_test_flt, -120.0_pl_test_flt, 120.0_pl_test_flt, &
-120.0_pl_test_flt, 120.0_pl_test_flt, 20.0_pl_test_flt, 120.0_pl_test_flt, &
-120.0_pl_test_flt, 120.0_pl_test_flt, -20.0_pl_test_flt, 120.0_pl_test_flt, &
-80.0_pl_test_flt, 80.0_pl_test_flt, -20.0_pl_test_flt, 120.0_pl_test_flt, &
-220.0_pl_test_flt, -120.0_pl_test_flt, -120.0_pl_test_flt, 120.0_pl_test_flt, &
-20.0_pl_test_flt, 20.0_pl_test_flt, -120.0_pl_test_flt, 120.0_pl_test_flt, &
-20.0_pl_test_flt, 20.0_pl_test_flt, -20.0_pl_test_flt, 20.0_pl_test_flt, &
-80.0_pl_test_flt, 80.0_pl_test_flt, -80.0_pl_test_flt, 80.0_pl_test_flt, &
20.0_pl_test_flt, 120.0_pl_test_flt, -120.0_pl_test_flt, 120.0_pl_test_flt/
npts = 0
! Parse and process command line arguments
plparseopts_rc = plparseopts(PL_PARSE_FULL)
if(plparseopts_rc .ne. 0) stop "plparseopts error"
! Initialize plplot
call plssub(3,3)
call plinit()
do k = 1,2
do j = 1,4
select case ( j )
case ( 1 ) ! Polygon 1: a diamond
x0(1) = 0.0_pl_test_flt
y0(1) = -100.0_pl_test_flt
x0(2) = -100.0_pl_test_flt
y0(2) = 0.0_pl_test_flt
x0(3) = 0.0_pl_test_flt
y0(3) = 100.0_pl_test_flt
x0(4) = 100.0_pl_test_flt
y0(4) = 0.0_pl_test_flt
npts = 4
case( 2 )
! Polygon 1: a diamond - reverse direction
x0(4) = 0.0_pl_test_flt
y0(4) = -100.0_pl_test_flt
x0(3) = -100.0_pl_test_flt
y0(3) = 0.0_pl_test_flt
x0(2) = 0.0_pl_test_flt
y0(2) = 100.0_pl_test_flt
x0(1) = 100.0_pl_test_flt
y0(1) = 0.0_pl_test_flt
npts = 4
case( 3 )
! Polygon 2: a square with punctures
x0(1) = -100.0_pl_test_flt
y0(1) = -100.0_pl_test_flt
x0(2) = -100.0_pl_test_flt
y0(2) = -80.0_pl_test_flt
x0(3) = 80.0_pl_test_flt
y0(3) = 0.0_pl_test_flt
x0(4) = -100.0_pl_test_flt
y0(4) = 80.0_pl_test_flt
x0(5) = -100.0_pl_test_flt
y0(5) = 100.0_pl_test_flt
x0(6) = -80.0_pl_test_flt
y0(6) = 100.0_pl_test_flt
x0(7) = 0.0_pl_test_flt
y0(7) = 80.0_pl_test_flt
x0(8) = 80.0_pl_test_flt
y0(8) = 100.0_pl_test_flt
x0(9) = 100.0_pl_test_flt
y0(9) = 100.0_pl_test_flt
x0(10) = 100.0_pl_test_flt
y0(10) = -100.0_pl_test_flt
npts = 10
case( 4 )
! Polygon 2: a square with punctures - reversed direction
x0(10) = -100.0_pl_test_flt
y0(10) = -100.0_pl_test_flt
x0(9) = -100.0_pl_test_flt
y0(9) = -80.0_pl_test_flt
x0(8) = 80.0_pl_test_flt
y0(8) = 0.0_pl_test_flt
x0(7) = -100.0_pl_test_flt
y0(7) = 80.0_pl_test_flt
x0(6) = -100.0_pl_test_flt
y0(6) = 100.0_pl_test_flt
x0(5) = -80.0_pl_test_flt
y0(5) = 100.0_pl_test_flt
x0(4) = 0.0_pl_test_flt
y0(4) = 80.0_pl_test_flt
x0(3) = 80.0_pl_test_flt
y0(3) = 100.0_pl_test_flt
x0(2) = 100.0_pl_test_flt
y0(2) = 100.0_pl_test_flt
x0(1) = 100.0_pl_test_flt
y0(1) = -100.0_pl_test_flt
npts = 10
end select
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', 1.0_pl_test_flt, 0, 'bcnv', 10.0_pl_test_flt, 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._pl_test_flt)
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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