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SwanPointinMesh.ftn90
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SwanPointinMesh.ftn90
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logical function SwanPointinMesh ( x, y )
!
! --|-----------------------------------------------------------|--
! | 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, June 2007: New subroutine
!
! Purpose
!
! Checks whether the given point is inside the mesh
!
! Method
!
! draw a vertical line from the point and count the number of crossings with boundary faces
! if the number of crossings is odd then the given point is inside the mesh
!
! Modules used
!
use ocpcomm4
use SwanGriddata
use SwanGridobjects
!
implicit none
!
! Argument variables
!
real, intent(in) :: x ! x-coordinate of given point
real, intent(in) :: y ! y-coordinate of given point
!
! Local variables
!
integer, save :: ient = 0 ! number of entries in this subroutine
integer :: iface ! loop counter over faces
integer :: numcrs ! number of crossings with boundary faces
integer :: v1 ! first vertex of present face
integer :: v2 ! second vertex of present face
!
real :: x1 ! x-coordinate of begin of boundary face
real :: x2 ! x-coordinate of end of boundary face
real :: y1 ! y-coordinate of begin of boundary face
real :: y2 ! y-coordinate of end of boundary face
real :: yc ! y-coordinate of cross point
!
type(facetype), dimension(:), pointer :: face ! datastructure for faces with their attributes
!
! Structure
!
! Description of the pseudo code
!
! Source text
!
if (ltrace) call strace (ient,'SwanPointinMesh')
!
! point to face object
!
face => gridobject%face_grid
!
numcrs = 0
!
! loop over faces (both internal and boundary faces)
!
do iface = 1, nfaces
!
if ( face(iface)%atti(FMARKER) == 1 ) then ! boundary face
!
v1 = face(iface)%atti(FACEV1)
v2 = face(iface)%atti(FACEV2)
!
x1 = xcugrd(v1)
y1 = ycugrd(v1)
x2 = xcugrd(v2)
y2 = ycugrd(v2)
!
if ( ( (x1 > x) .and. (x2 <= x) ) .or. ( (x2 > x) .and. (x1 <= x) ) ) then
!
if ( y1 > y .or. y2 > y ) then
!
yc = y1 + (x-x1) * (y2-y1) / (x2-x1)
if ( yc > y ) numcrs = numcrs + 1
!
endif
!
endif
!
endif
!
enddo
!
! if number of crossings is odd then point is inside the grid
!
if ( mod(numcrs,2) == 1 ) then
SwanPointinMesh = .true.
else
SwanPointinMesh = .false.
endif
!
end function SwanPointinMesh