FaceCentroid.F90

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!******************************************************************************
!
! Purpose: Calculate the face centroid of a triangular or quadrilateral face.
!
! Description: File contains the following subroutines:
!  - FaceCentroidTria = Centroid of a triangle
!  - FaceCentroidQuad = Centroid of a quadrilateral
!
! Input: xyzNodes = coordinates (1st index) of the nodes (2nd index) of the
!                   polygon (clockwise ordered).
!
! Output: fCenX, fCenY, fCenZ = x-,y-,z-component of the face centroid.
!
! Notes:
!   1. Quadrilateral face centroid is only approximate for distorted faces.
!
!******************************************************************************
!
! $Id: FaceCentroid.F90,v 1.3 2008/12/06 08:44:09 mtcampbe Exp $
!
! Copyright: (c) 2002 by the University of Illinois
!
!******************************************************************************

SUBROUTINE facecentroidtria( xyz,fCenX,fCenY,fCenZ )

  USE moddatatypes

  IMPLICIT NONE

! ... parameters

  REAL(RFREAL), INTENT(IN) :: xyz(3,3)
  REAL(RFREAL), INTENT(OUT) :: fcenx, fceny, fcenz

! ... local variables

  REAL(RFREAL), PARAMETER :: thrd = 1.0_rfreal/3.0_rfreal 
  
!******************************************************************************

  fcenx = thrd*(xyz(1,1) + xyz(1,2) + xyz(1,3))
  fceny = thrd*(xyz(2,1) + xyz(2,2) + xyz(2,3))
  fcenz = thrd*(xyz(3,1) + xyz(3,2) + xyz(3,3))

END SUBROUTINE facecentroidtria

! #############################################################################
! #############################################################################

SUBROUTINE facecentroidquad( xyz,fCenX,fCenY,fCenZ )

  USE moddatatypes
  
  IMPLICIT NONE

! ... parameters

  REAL(RFREAL), INTENT(IN) :: xyz(3,4)
  REAL(RFREAL), INTENT(OUT) :: fcenx, fceny, fcenz

! ... local variables

!******************************************************************************

  fcenx = 0.25_rfreal*(xyz(1,1) + xyz(1,2) + xyz(1,3) + xyz(1,4))
  fceny = 0.25_rfreal*(xyz(2,1) + xyz(2,2) + xyz(2,3) + xyz(2,4))
  fcenz = 0.25_rfreal*(xyz(3,1) + xyz(3,2) + xyz(3,3) + xyz(3,4))

END SUBROUTINE facecentroidquad

!******************************************************************************
!
! RCS Revision history:
!
! $Log: FaceCentroid.F90,v $
! Revision 1.3  2008/12/06 08:44:09  mtcampbe
! Updated license.
!
! Revision 1.2  2008/11/19 22:17:22  mtcampbe
! Added Illinois Open Source License/Copyright
!
! Revision 1.1  2004/12/01 16:48:32  haselbac
! Initial revision after changing case
!
! Revision 1.1  2002/03/14 19:01:10  haselbac
! Initial revision
!
!******************************************************************************