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SwanCrossObstacle.ftn90
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SwanCrossObstacle.ftn90
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logical function SwanCrossObstacle ( xv, yv, xobs, yobs )
!
! --|-----------------------------------------------------------|--
! | Delft University of Technology |
! | Faculty of Civil Engineering and Geosciences |
! | Environmental Fluid Mechanics Section |
! | P.O. Box 5048, 2600 GA Delft, The Netherlands |
! | |
! | Programmer: Marcel Zijlema |
! --|-----------------------------------------------------------|--
!
!
! SWAN (Simulating WAves Nearshore); a third generation wave model
! Copyright (C) 1993-2024 Delft University of Technology
!
! This program is free software: you can redistribute it and/or modify
! it under the terms of the GNU General Public License as published by
! the Free Software Foundation, either version 3 of the License, or
! (at your option) any later version.
!
! This program 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 General Public License for more details.
!
! You should have received a copy of the GNU General Public License
! along with this program. If not, see <http://www.gnu.org/licenses/>.
!
!
! Authors
!
! 40.80: Marcel Zijlema
!
! Updates
!
! 40.80, March 2008: New subroutine
!
! Purpose
!
! Checks whether an obstacle line cross a face in computational grid
!
! Method
!
! See Technical documentation
!
! Modules used
!
use ocpcomm4
!
implicit none
!
! Argument variables
!
real, dimension(2), intent(in) :: xobs ! x-coordinate of obstacle point
real, dimension(2), intent(in) :: xv ! x-coordinate of vertex of face
real, dimension(2), intent(in) :: yobs ! y-coordinate of obstacle point
real, dimension(2), intent(in) :: yv ! y-coordinate of vertex of face
!
! Local variables
!
integer, save :: ient = 0 ! number of entries in this subroutine
!
real :: a ! dummy variable
real :: b ! dummy variable
real :: c ! dummy variable
real :: d ! dummy variable
real :: det ! determinant
real :: e ! dummy variable
real :: f ! dummy variable
real :: p ! dummy variable
real :: q ! dummy variable
!
logical :: EQREAL ! indicate whether two reals are equal or not
!
! Structure
!
! Description of the pseudo code
!
! Source text
!
if (ltrace) call strace (ient,'SwanCrossObstacle')
!
! initially, we assume there is crossing
!
SwanCrossObstacle = .true.
!
a = xv(1) - xobs(1)
b = yv(1) - yobs(1)
!
c = xv(2) - xv(1)
d = yv(2) - yv(1)
!
e = xobs(2) - xobs(1)
f = yobs(2) - yobs(1)
!
! compute determinant
!
det = e*d - f*c
!
if ( .not.EQREAL(det,0.) ) then
!
p = (a*d - b*c)/det
q = (a*f - b*e)/det
!
if ( p<0. .or. p>1. .or. q<0. .or. q>1. ) SwanCrossObstacle = .false.
!
else
!
SwanCrossObstacle = .false.
!
endif
!
end function SwanCrossObstacle