GET_DIME_EXPL.f90

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!    Copyright (C) 2012 The SPEED FOUNDATION
!    Author: Ilario Mazzieri
!
!    This file is part of SPEED.
!
!    SPEED is free software; you can redistribute it and/or modify it
!    under the terms of the GNU Affero General Public License as
!    published by the Free Software Foundation, either version 3 of the
!    License, or (at your option) any later version.
!
!    SPEED 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
!    Affero General Public License for more details.
!
!    You should have received a copy of the GNU Affero General Public License
!    along with SPEED.  If not, see <http://www.gnu.org/licenses/>.
 
 
      subroutine get_dime_expl(Xipo,Yipo,Zipo, &
                                 X1,Y1,Z1, &
                                 X2,Y2,Z2, &
                                 X3,Y3,Z3, &
                                 nnod,xs,ys,zs, &
                                 node_expl,nnloc)
         
      implicit none
      
      integer*4 :: nnod,node_expl,nnloc
      integer*4 :: isn
 
      real*8 :: xipo,yipo,zipo,x1,y1,z1,x2,y2,z2,x3,y3,z3,ux,uy,uz,vx,vy,vz,tol
      real*8 :: xmax,xmin,ymax,ymin,zmin,zmax,a,b,c, den
      real*8, dimension(nnloc) :: xs,ys,zs
 
      node_expl = 0
      tol = 5.0d0
      
      ux=(x1-x2)/sqrt((x1-x2)**2+(y1-y2)**2+(z1-z2)**2)
      uy=(y1-y2)/sqrt((x1-x2)**2+(y1-y2)**2+(z1-z2)**2)
      uz=(z1-z2)/sqrt((x1-x2)**2+(y1-y2)**2+(z1-z2)**2)
      vx=(x3-x2)/sqrt((x3-x2)**2+(y3-y2)**2+(z3-z2)**2)
      vy=(y3-y2)/sqrt((x3-x2)**2+(y3-y2)**2+(z3-z2)**2)
      vz=(z3-z2)/sqrt((x3-x2)**2+(y3-y2)**2+(z3-z2)**2)
      
      a = uy * vz - uz * vy 
      b = uz * vx - ux * vz
      c = ux * vy - uy * vx
      den = sqrt(a**2 + b**2 + c**2)
 
      !Check on the relative position of fault end points
      !In this preliminary part we check if P1 point is the lower-left fault point or not
      !If this check would fail the two points are swapped
  
      xmax=max(x1,x2,x3)+tol
      xmin=min(x1,x2,x3)-tol
      ymax=max(y1,y2,y3)+tol
      ymin=min(y1,y2,y3)-tol
      zmax=max(z1,z2,z3)+tol
      zmin=min(z1,z2,z3)-tol
  
  
      do isn = 1,nnod
         if ( dabs( a*(xs(isn)-xipo) + b*(ys(isn)-yipo) + c*(zs(isn)-zipo)/den ).le.tol) then
            if ((xs(isn).ge.xmin).and.(xs(isn).le.xmax)) then
                if ((ys(isn).ge.ymin).and.(ys(isn).le.ymax)) then
                    if ((zs(isn).ge.zmin).and.(zs(isn).le.zmax)) then
                        node_expl = node_expl+1
                    endif
                endif
            endif
         endif         
      enddo
 
      return
      end subroutine get_dime_expl