From 6687c44ec86e4aaf48b14a5ee9a4d2638b515d42 Mon Sep 17 00:00:00 2001
From: diener <diener@89daf98e-ef62-4674-b946-b8ff9de2216c>
Date: Fri, 1 Aug 2003 14:34:43 +0000
Subject: Now uses SetDriftCorrectPosition to set the Driftcorrect centroid.

git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinAnalysis/AHFinder/trunk@352 89daf98e-ef62-4674-b946-b8ff9de2216c
---
 src/AHFinder_gau.F | 68 +++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 52 insertions(+), 16 deletions(-)

diff --git a/src/AHFinder_gau.F b/src/AHFinder_gau.F
index 0e97711..5de6103 100644
--- a/src/AHFinder_gau.F
+++ b/src/AHFinder_gau.F
@@ -68,6 +68,8 @@
       CCTK_REAL, allocatable, dimension(:,:) :: txx,tyy,tzz,txy,txz,tyz
       CCTK_REAL, allocatable, dimension(:,:) :: g11,g22,g12
 
+      CCTK_REAL, dimension(3) :: ahf_centroid, rahf_centroid
+
       CCTK_REAL :: m1p, m2p, x1p, x2p,  y1p, y2p, z1p, z2p
       CCTK_REAL :: r12, r22, sigma
       CCTK_REAL, dimension(nx,ny,nz) :: fac
@@ -76,6 +78,7 @@
       logical :: str_comp
       logical :: gaussf_exists
       external str_comp
+!      CCTK_INT :: CCTK_IsFunctionAliased
 
       character(len=32) :: tmpstr
 
@@ -605,24 +608,15 @@
          avgy = avgy/dble(npoints)
          avgz = avgz/dble(npoints)
 
-         if ((.not.find3).or.
-     .       (find3.and.(mfind-1.eq.horizon_centroid))) then
-
-            ahf_centroid_x = avgx
-            ahf_centroid_y = avgy
-
-!           Take symmetries into account.
+         ahf_centroid(1) = avgx
+         ahf_centroid(2) = avgy
+         ahf_centroid(3) = avgz
 
-            if (refx) ahf_centroid_x = xc
-            if (refy) ahf_centroid_y = yc
-
-            if (verbose) then
-              write(*,*)
-              write(6,*) 'AHFinder_gau: ahf_centroid_x = ', ahf_centroid_x
-              write(6,*) 'AHFinder_gau: ahf_centroid_y = ', ahf_centroid_y
-            end if
+!        Take symmetries into account.
 
-         end if
+         if (refx) ahf_centroid(1) = xc
+         if (refy) ahf_centroid(2) = yc
+         if (refz) ahf_centroid(3) = zc
 
 !     Other processors.
 
@@ -632,6 +626,9 @@
          ya = half*(ymx+ymn)
          za = half*(zmx+zmn)
 
+         ahf_centroid(1) = zero
+         ahf_centroid(2) = zero
+         ahf_centroid(3) = zero
       end if
 
 
@@ -655,6 +652,45 @@
       end if
       error2 = rerror
 
+      call CCTK_ReduceLocArrayToArray1D(ierror,cctkGH,-1,sum_handle,
+     .   ahf_centroid,rahf_centroid,3,CCTK_VARIABLE_REAL)
+
+      if (ierror.ne.0) then
+         call CCTK_WARN(1,"Reduction failed!")
+      end if
+
+      if ( ( which_horizon_to_announce_centroid .gt. 0 ) .and. 
+     .     ( which_horizon_to_announce_centroid .eq. mfind ) ) then
+
+         call CCTK_IsFunctionAliased(ierror, 
+     .                                "SetDriftCorrectPosition")
+         if ( ierror .eq. 1 ) then
+            call CCTK_INFO("Announcing centroid to DriftCorrect")
+            call SetDriftCorrectPosition ( cctkGH, ahf_centroid(1),
+     .                                             ahf_centroid(2), 
+     .                                             ahf_centroid(3) )
+         end if
+      end if
+
+      if ( ( which_horizon_to_output_centroid .gt. 0 ) .and.
+     .     ( which_horizon_to_output_centroid .eq. mfind ) ) then
+
+         ahf_centroid_x = rahf_centroid(1)
+         ahf_centroid_y = rahf_centroid(2)
+         ahf_centroid_z = rahf_centroid(3)
+
+         if (verbose) then
+            write(*,*)
+            write(6,*) 'AHFinder_gau: ahf_centroid_x = ',
+     .                                             ahf_centroid_x
+            write(6,*) 'AHFinder_gau: ahf_centroid_y = ',
+     .                                             ahf_centroid_y
+            write(6,*) 'AHFinder_gau: ahf_centroid_z = ',
+     .                                             ahf_centroid_z
+         end if
+      end if
+
+
 !     If there was an error then return from the subroutine
 !     (but remember to deallocate the arrays first!).
 
-- 
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