diff --git a/katabatic/src/AutoHorizontal.cpp b/katabatic/src/AutoHorizontal.cpp
index 7ae78a7f..a0ab6c3e 100644
--- a/katabatic/src/AutoHorizontal.cpp
+++ b/katabatic/src/AutoHorizontal.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2008, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
diff --git a/katabatic/src/AutoSegment.cpp b/katabatic/src/AutoSegment.cpp
index bd9f9c2e..a5537739 100644
--- a/katabatic/src/AutoSegment.cpp
+++ b/katabatic/src/AutoSegment.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2008, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
@@ -300,8 +300,9 @@ namespace Katabatic {
 // Class  :  "Katabatic::AutoSegment".
 
 
-  size_t         AutoSegment::_allocateds  = 0;
-  unsigned long  AutoSegment::_maxId       = 0;
+  size_t         AutoSegment::_allocateds   = 0;
+  size_t         AutoSegment::_globalsCount = 0;
+  unsigned long  AutoSegment::_maxId        = 0;
 
 
   DbU::Unit  AutoSegment::getX () const
@@ -831,11 +832,11 @@ namespace Katabatic {
 #if defined(CHECK_DETERMINISM)
     cerr << "Order: AutoSegment::AutoSegment() - <id:" << _id << ">" << endl;
 #endif
-    _allocateds++;
-
     AutoContact* source = Session::lookup(dynamic_cast<Contact*>(segment->getSource()));
     AutoContact* target = Session::lookup(dynamic_cast<Contact*>(segment->getTarget()));
 
+    _allocateds++;
+
     _gcell = source->getGCell();
     setOptimalMax ( (_isHorizontal) ? _gcell->getBoundingBox().getYMax()
                   : _gcell->getBoundingBox().getXMax() );
@@ -847,8 +848,8 @@ namespace Katabatic {
         _isGlobal = ( source->getGCell() != target->getGCell() );
         break;
     }
-
-    _isCanonicalLocal = !_isGlobal;
+    _globalsCount   += (_isGlobal) ? 1 : 0;
+    _isCanonicalLocal = not _isGlobal;
 
     _computeTerminal ( segment );
   //if ( source->isTerminal() or target->isTerminal() ) _isTerminal = true;
@@ -907,6 +908,7 @@ namespace Katabatic {
   AutoSegment::~AutoSegment ()
   {
     _allocateds--;
+    if ( _isGlobal and (_globalsCount > 0) ) _globalsCount--;
   }
 
 
@@ -1238,7 +1240,7 @@ namespace Katabatic {
   }
 
 
-  bool  AutoSegment::canPivotUp ( bool propagate )
+  bool  AutoSegment::canPivotUp ( bool propagate, float reserve )
   {
     ltrace(200) << "AutoSegment::canPivotUp()" << endl;
 
@@ -1250,7 +1252,7 @@ namespace Katabatic {
     vector<GCell*> gcells;
     getGCells ( gcells );
     for ( size_t i=0 ; i<gcells.size() ; i++ ) {
-      if ( !gcells[i]->hasFreeTrack(depth) ) return false;
+      if ( !gcells[i]->hasFreeTrack(depth,reserve) ) return false;
     }
 
     ltrace(200) << getAutoSource() << endl;
@@ -1270,7 +1272,7 @@ namespace Katabatic {
       forEach ( AutoSegment*, isegment, getCollapseds() ) {
         isegment->getGCells ( gcells );
         for ( size_t i=0 ; i<gcells.size() ; i++ ) {
-          if ( !gcells[i]->hasFreeTrack(depth) ) return false;
+          if ( !gcells[i]->hasFreeTrack(depth,reserve) ) return false;
         }
         if ( isegment->getAutoSource()->getMinDepth() < depth ) return false;
         if ( isegment->getAutoTarget()->getMinDepth() < depth ) return false;
@@ -1283,7 +1285,7 @@ namespace Katabatic {
   }
 
 
-  bool  AutoSegment::canMoveUp ( bool propagate )
+  bool  AutoSegment::canMoveUp ( bool propagate, float reserve )
   {
     ltrace(200) << "AutoSegment::canMoveUp()" << endl;
 
@@ -1296,7 +1298,7 @@ namespace Katabatic {
     vector<GCell*> gcells;
     getGCells ( gcells );
     for ( size_t i=0 ; i<gcells.size() ; i++ ) {
-      if ( not gcells[i]->hasFreeTrack(depth) ) return false;
+      if ( not gcells[i]->hasFreeTrack(depth,reserve) ) return false;
     }
 
     if ( isLocal() and not propagate ) {
@@ -1314,7 +1316,7 @@ namespace Katabatic {
 
         isegment->getGCells ( gcells );
         for ( size_t i=0 ; i<gcells.size() ; i++ ) {
-          if ( not gcells[i]->hasFreeTrack(depth) ) {
+          if ( not gcells[i]->hasFreeTrack(depth,reserve) ) {
             ltrace(200) << "Not enough free track in " << gcells[i] << endl;
             return false;
           }
@@ -1523,9 +1525,9 @@ namespace Katabatic {
 
     Contact*     contact     = dynamic_cast<Contact*>(hurricaneSegment->getSource());
     AutoContact* autoContact = Session::lookup(contact);
-    if ( !contact ) {
+    if ( contact == NULL ) {
       throw Error ( badSegmentSource, getString(hurricaneSegment).c_str() );
-      if ( autoContact && ( autoContact != source ) )
+      if ( autoContact and ( autoContact != source ) )
         throw Error ( mismatchSegmentSource
                     , getString(hurricaneSegment).c_str()
                     , getString(contact).c_str() );
@@ -1533,9 +1535,9 @@ namespace Katabatic {
 
     contact     = dynamic_cast<Contact*>(hurricaneSegment->getTarget());
     autoContact = Session::lookup(contact);
-    if ( !contact ) {
+    if ( contact == NULL ) {
       throw Error ( badSegmentTarget, getString(hurricaneSegment).c_str() );
-      if ( autoContact && ( autoContact != target ) )
+      if ( autoContact and ( autoContact != target ) )
         throw Error ( mismatchSegmentTarget
                     , getString(hurricaneSegment).c_str()
                     , getString(contact).c_str() );
diff --git a/katabatic/src/AutoSegments.cpp b/katabatic/src/AutoSegments.cpp
index 1ba4c7f9..94430bed 100644
--- a/katabatic/src/AutoSegments.cpp
+++ b/katabatic/src/AutoSegments.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2008, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
diff --git a/katabatic/src/Configuration.cpp b/katabatic/src/Configuration.cpp
index fb0aa992..96f93084 100644
--- a/katabatic/src/Configuration.cpp
+++ b/katabatic/src/Configuration.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2008, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
diff --git a/katabatic/src/GCell.cpp b/katabatic/src/GCell.cpp
index 8df443a4..ae9f467e 100644
--- a/katabatic/src/GCell.cpp
+++ b/katabatic/src/GCell.cpp
@@ -721,7 +721,7 @@ namespace Katabatic {
   }
 
 
-  bool  GCell::hasFreeTrack ( size_t depth ) const
+  bool  GCell::hasFreeTrack ( size_t depth, float reserve ) const
   {
     if (_invalid) const_cast<GCell*>(this)->updateDensity();
 
@@ -765,7 +765,7 @@ namespace Katabatic {
                 << " " << (_saturateDensities[depth]*capacity) << " vs. " << capacity
                 << endl;
 
-    return (_saturateDensities[depth]*capacity + 1.0 <= capacity);
+    return (_saturateDensities[depth]*capacity + 1.0 + reserve <= capacity);
   }
 
 
diff --git a/katabatic/src/GCellGrid.cpp b/katabatic/src/GCellGrid.cpp
index 8f187e3c..7efd7edd 100644
--- a/katabatic/src/GCellGrid.cpp
+++ b/katabatic/src/GCellGrid.cpp
@@ -54,7 +54,7 @@ namespace Katabatic {
 
 
   GCellGrid::GCellGrid ( KatabaticEngine* ktbt )
-    : Grid<GCell>()
+    : Grid<GCell>(ktbt->getCell()->getAbutmentBox())
     , _katabatic(ktbt)
   { }
 
@@ -140,6 +140,18 @@ namespace Katabatic {
   }
 
 
+  Interval  GCellGrid::getUSide ( unsigned int direction ) const
+  {
+    Interval side;
+    switch ( direction ) {
+      default:
+      case Constant::Horizontal: side = Interval(_boundingBox.getXMin(),_boundingBox.getXMax()); break;
+      case Constant::Vertical:   side = Interval(_boundingBox.getYMin(),_boundingBox.getYMax()); break;
+    }
+    return side;
+  }
+
+
   void  GCellGrid::updateContacts ( bool openSession )
   {
     if ( openSession ) Session::open ( _katabatic );
diff --git a/katabatic/src/Grid.cpp b/katabatic/src/Grid.cpp
index 1da6c3c2..24872bd6 100644
--- a/katabatic/src/Grid.cpp
+++ b/katabatic/src/Grid.cpp
@@ -49,6 +49,11 @@ namespace Katabatic {
 
   unsigned int  BaseGrid::Axis::getGraduationNumber ( DbU::Unit position, bool& onGraduation ) const
   {
+    if ( position == _graduations[_graduations.size()-1] ) {
+      onGraduation = true;
+      return _graduations.size()-2;
+    }
+
     vector<DbU::Unit>::const_iterator  it = lower_bound ( _graduations.begin()
                                                         , _graduations.end()
                                                         , position+1
@@ -99,11 +104,13 @@ namespace Katabatic {
 // Class  :  "Katabatic::BaseGrid::Axis".
 
 
-  BaseGrid::BaseGrid () : _xGraduations()
-                        , _yGraduations()
-                        , _rows(0)
-                        , _columns(0)
-                        , _rawSize(0)
+  BaseGrid::BaseGrid ( const Box& bb )
+    : _boundingBox (bb)
+    , _xGraduations()
+    , _yGraduations()
+    , _rows        (0)
+    , _columns     (0)
+    , _rawSize     (0)
   { }
 
 
diff --git a/katabatic/src/KatabaticEngine.cpp b/katabatic/src/KatabaticEngine.cpp
index ebce2122..e764768c 100644
--- a/katabatic/src/KatabaticEngine.cpp
+++ b/katabatic/src/KatabaticEngine.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2008, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
@@ -38,6 +38,7 @@
 #include  "hurricane/Cell.h"
 
 #include  "crlcore/Utilities.h"
+#include  "crlcore/Catalog.h"
 #include  "crlcore/Measures.h"
 #include  "crlcore/AllianceFramework.h"
 
@@ -170,6 +171,8 @@ namespace Katabatic {
   using  Hurricane::BasicLayer;
   using  Hurricane::NetExternalComponents;
   using  CRL::AllianceFramework;
+  using  CRL::Catalog;
+  using  CRL::CatalogProperty;
   using  CRL::Measures;
   using  CRL::addMeasure;
   using  CRL::getMeasure;
@@ -230,7 +233,9 @@ namespace Katabatic {
     , _gcellGrid         (NULL)
     , _routingNets       ()
   {
-    addMeasure<size_t> ( cell, "Gates", cell->getInstances().getSize() );
+    addMeasure<size_t> ( cell, "Gates"
+                       , AllianceFramework::getInstancesCount(cell,AllianceFramework::IgnoreFeeds
+                                                                  |AllianceFramework::Recursive) );
   }
 
 
diff --git a/katabatic/src/LoadGrByNet.cpp b/katabatic/src/LoadGrByNet.cpp
index 1014e3fb..0acc7973 100644
--- a/katabatic/src/LoadGrByNet.cpp
+++ b/katabatic/src/LoadGrByNet.cpp
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2008, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
@@ -39,11 +39,13 @@
 #include  "hurricane/RoutingPads.h"
 #include  "hurricane/Pad.h"
 #include  "hurricane/Plug.h"
+#include  "hurricane/Cell.h"
 #include  "hurricane/Instance.h"
 #include  "hurricane/Vertical.h"
 #include  "hurricane/Horizontal.h"
 
 #include  "crlcore/RoutingGauge.h"
+#include  "crlcore/Measures.h"
 
 #include  "katabatic/AutoContact.h"
 #include  "katabatic/AutoSegment.h"
@@ -2217,16 +2219,18 @@ namespace {
       return;
     }
 
-    if ( routingPads.size() > 2 ) {
-      cerr << Error("For %s, more than two Plugs/Pins (%d) in single GCell."
-                   ,getString(net).c_str()
-                   ,routingPads.size()) << endl;
-      ltraceout(99);
-      return;
-    }
+    // if ( routingPads.size() > 2 ) {
+    //   cerr << Error("For %s, more than two Plugs/Pins (%d) in single GCell."
+    //                ,getString(net).c_str()
+    //                ,routingPads.size()) << endl;
+    //   ltraceout(99);
+    //   return;
+    // }
 
-    GCell* gcell = ktbt->getGCellGrid()->getGCell ( routingPads[0]->getCenter()
-                                                  , routingPads[1]->getCenter() );
+    sort ( routingPads.begin(), routingPads.end(), SortRpByX(false) ); // increasing X.
+
+    GCell* gcell = ktbt->getGCellGrid()->getGCell ( (*routingPads.begin ())->getCenter()
+                                                  , (*routingPads.rbegin())->getCenter() );
 
     if ( !gcell ) {
       cerr << Error("No GCell under %s.",getString(routingPads[0]).c_str()) << endl;
@@ -2239,36 +2243,30 @@ namespace {
     AutoContact* dummy  = NULL;
     AutoContact* source = NULL;
     AutoContact* target = NULL;
-    GCellConfiguration::_GCell_rp_AutoContacts ( gcell, routingPads[0], source, dummy, true );
-    GCellConfiguration::_GCell_rp_AutoContacts ( gcell, routingPads[1], target, dummy, true );
 
-    // AutoContact* source = AutoContact::fromRp ( gcell
-    //                                           , routingPads[0]
-    //                                           , Session::getContactLayer(0)
-    //                                           , routingPads[0]->getCenter()
-    //                                           , DbU::lambda(1.0), DbU::lambda(1.0)
-    //                                           );
-    // AutoContact* target = AutoContact::fromRp ( gcell
-    //                                           ,  routingPads[1]
-    //                                           , Session::getContactLayer(0)
-    //                                           , routingPads[1]->getCenter()
-    //                                           , DbU::lambda(1.0), DbU::lambda(1.0)
-    //                                           );
-
-    Box sourceBox = source->getNativeConstraintBox ();
-    Box targetBox = target->getNativeConstraintBox ();
-
-    if (    ( sourceBox.getYMax() < targetBox.getYMin() ) 
-         || ( sourceBox.getYMin() > targetBox.getYMax() ) ) {
-      AutoContact* subContact1 = AutoContact::create ( gcell, net, Session::getContactLayer(1) );
-      AutoSegment::create ( source, subContact1, Constant::Vertical, AutoSegment::Local, true );
-
-      AutoContact* subContact2 = AutoContact::create ( gcell, net, Session::getContactLayer(1) );
-      AutoSegment::create ( target, subContact2, Constant::Vertical, AutoSegment::Local, true );
-
-      AutoSegment::create ( subContact1, subContact2, Constant::Horizontal, AutoSegment::Local, false );
-    } else
+    for ( size_t irp=1 ; irp<routingPads.size() ; ++irp ) {
+      GCellConfiguration::_GCell_rp_AutoContacts ( gcell, routingPads[irp-1], source, dummy, true );
+      GCellConfiguration::_GCell_rp_AutoContacts ( gcell, routingPads[irp  ], target, dummy, true );
       AutoSegment::create ( source, target, Constant::Horizontal, AutoSegment::Local, true );
+    }
+
+    // GCellConfiguration::_GCell_rp_AutoContacts ( gcell, routingPads[0], source, dummy, true );
+    // GCellConfiguration::_GCell_rp_AutoContacts ( gcell, routingPads[1], target, dummy, true );
+
+    // Box sourceBox = source->getNativeConstraintBox ();
+    // Box targetBox = target->getNativeConstraintBox ();
+
+    // if (    ( sourceBox.getYMax() < targetBox.getYMin() ) 
+    //      || ( sourceBox.getYMin() > targetBox.getYMax() ) ) {
+    //   AutoContact* subContact1 = AutoContact::create ( gcell, net, Session::getContactLayer(1) );
+    //   AutoSegment::create ( source, subContact1, Constant::Vertical, AutoSegment::Local, true );
+
+    //   AutoContact* subContact2 = AutoContact::create ( gcell, net, Session::getContactLayer(1) );
+    //   AutoSegment::create ( target, subContact2, Constant::Vertical, AutoSegment::Local, true );
+
+    //   AutoSegment::create ( subContact1, subContact2, Constant::Horizontal, AutoSegment::Local, false );
+    // } else
+    //   AutoSegment::create ( source, target, Constant::Horizontal, AutoSegment::Local, true );
 
     ltraceout(99);
   }
@@ -2282,10 +2280,12 @@ namespace {
 namespace Katabatic {
 
 
+  using Hurricane::Name;
   using Hurricane::DebugSession;
   using Hurricane::Error;
   using Hurricane::Warning;
   using Hurricane::Bug;
+  using CRL::addMeasure;
 
 
   void  KatabaticEngine::_loadGrByNet ()
@@ -2316,6 +2316,9 @@ namespace Katabatic {
 
     stopMeasures ();
     printMeasures ( "load" );
+
+    addMeasure<size_t> ( getCell(), "Globals", AutoSegment::getGlobalsCount() );
+    addMeasure<size_t> ( getCell(), "Edges"  , AutoSegment::getAllocateds() );
   }
 
 
diff --git a/katabatic/src/katabatic/AutoSegment.h b/katabatic/src/katabatic/AutoSegment.h
index 64d3ad93..2918ba84 100644
--- a/katabatic/src/katabatic/AutoSegment.h
+++ b/katabatic/src/katabatic/AutoSegment.h
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2008, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
@@ -131,7 +131,8 @@ namespace Katabatic {
                                                              , vector<AutoSegment*>& collapseds
                                                              );
       static inline int           getTerminalCount           ( AutoSegment* seed );
-      static size_t               getAllocateds              () { return _allocateds; };
+      static inline size_t        getGlobalsCount            ();
+      static inline size_t        getAllocateds              ();
       static inline unsigned long getMaxId                   ();
     // Constructors & Destructor.                            
       static  AutoSegment*        create                     ( AutoContact*  source
@@ -195,8 +196,8 @@ namespace Katabatic {
       inline  bool                allowOutsideGCell          () const;
               bool                canDesalignate             ();
       virtual bool                canDesalignate             ( AutoContact* ) const = 0;
-              bool                canMoveUp                  ( bool propagate=false );
-              bool                canPivotUp                 ( bool propagate=false );
+              bool                canMoveUp                  ( bool propagate=false, float reserve=0.0 );
+              bool                canPivotUp                 ( bool propagate=false, float reserve=0.0 );
               bool                canSlacken                 ( bool propagate=false );
       virtual bool                _canSlacken                () const = 0;
               bool                canGoOutsideGCell          () const;
@@ -302,6 +303,7 @@ namespace Katabatic {
     protected:                    
     // Internal: Static Attributes.
       static size_t               _allocateds;
+      static size_t               _globalsCount;
       static bool                 _destroyBase;
       static bool                 _destroyTool;
       static unsigned long        _maxId;
@@ -469,6 +471,10 @@ namespace Katabatic {
   }
 
 
+  inline size_t  AutoSegment::getGlobalsCount () { return _globalsCount; }
+  inline size_t  AutoSegment::getAllocateds   () { return _allocateds; }
+
+
 } // End of Katabatic namespace.
 
 
diff --git a/katabatic/src/katabatic/Configuration.h b/katabatic/src/katabatic/Configuration.h
index 7f227225..749e3037 100644
--- a/katabatic/src/katabatic/Configuration.h
+++ b/katabatic/src/katabatic/Configuration.h
@@ -2,7 +2,7 @@
 // -*- C++ -*-
 //
 // This file is part of the Coriolis Software.
-// Copyright (c) UPMC/LIP6 2008-2008, All Rights Reserved
+// Copyright (c) UPMC/LIP6 2008-2010, All Rights Reserved
 //
 // ===================================================================
 //
diff --git a/katabatic/src/katabatic/GCell.h b/katabatic/src/katabatic/GCell.h
index 03ecb5f6..1264093e 100644
--- a/katabatic/src/katabatic/GCell.h
+++ b/katabatic/src/katabatic/GCell.h
@@ -110,7 +110,7 @@ namespace Katabatic {
               bool                  isSaturated         ( size_t depth ) const;
       inline  bool                  isValid             () const;
               bool                  isAboveDensity      ( float threshold ) const;
-              bool                  hasFreeTrack        ( size_t depth ) const;
+              bool                  hasFreeTrack        ( size_t depth, float reserve ) const;
       inline  GCellGrid*            getGCellGrid        () const;
       inline  unsigned int          getDepth            () const;
       inline  unsigned int          getIndex            () const;
diff --git a/katabatic/src/katabatic/GCellGrid.h b/katabatic/src/katabatic/GCellGrid.h
index 518edb14..281f63a0 100644
--- a/katabatic/src/katabatic/GCellGrid.h
+++ b/katabatic/src/katabatic/GCellGrid.h
@@ -50,15 +50,16 @@ namespace Katabatic {
   class GCellGrid : public Grid<GCell> {
 
     public:
-              Cell*   getCell             () const;
-              void    updateContacts      ( bool openSession=true );
-              size_t  checkDensity        () const;
-              size_t  updateDensity       ();
-              bool    checkEdgeSaturation ( float threshold ) const;
-              void    _xmlWrite           ( ostream& );
-      virtual Record* _getRecord          () const;
-      virtual string  _getString          () const;
-      virtual string  _getTypeName        () const;
+              Cell*     getCell             () const;
+              Interval  getUSide            ( unsigned int ) const;
+              void      updateContacts      ( bool openSession=true );
+              size_t    checkDensity        () const;
+              size_t    updateDensity       ();
+              bool      checkEdgeSaturation ( float threshold ) const;
+              void      _xmlWrite           ( ostream& );
+      virtual Record*   _getRecord          () const;
+      virtual string    _getString          () const;
+      virtual string    _getTypeName        () const;
 
     // Attributes.
     protected:
diff --git a/katabatic/src/katabatic/Grid.h b/katabatic/src/katabatic/Grid.h
index fb39af77..4a70bec8 100644
--- a/katabatic/src/katabatic/Grid.h
+++ b/katabatic/src/katabatic/Grid.h
@@ -58,19 +58,20 @@ namespace Katabatic {
     public:
       class  Axis;
     public:
-      inline  void          destroy    ();
+      inline  void          destroy        ();
     // Accessors.
-      inline  unsigned int  getColumns () const;
-      inline  unsigned int  getRows    () const;
-      inline  unsigned int  getRawSize () const;
-      inline  unsigned int  getIndex   ( unsigned int c, unsigned int r ) const;
-      inline  unsigned int  getRow     ( unsigned int ) const;
-      inline  unsigned int  getColumn  ( unsigned int ) const;
-      inline  const Axis&   getXGrads  () const;
-      inline  const Axis&   getYGrads  () const;
-    // Inspector Managment.
-      virtual Record*       _getRecord () const;
-      virtual string        _getString () const = 0;
+      inline  const Box&    getBoundingBox () const;
+      inline  unsigned int  getColumns     () const;
+      inline  unsigned int  getRows        () const;
+      inline  unsigned int  getRawSize     () const;
+      inline  unsigned int  getIndex       ( unsigned int c, unsigned int r ) const;
+      inline  unsigned int  getRow         ( unsigned int ) const;
+      inline  unsigned int  getColumn      ( unsigned int ) const;
+      inline  const Axis&   getXGrads      () const;
+      inline  const Axis&   getYGrads      () const;
+    // Inspector Managment.                
+      virtual Record*       _getRecord     () const;
+      virtual string        _getString     () const = 0;
 
     public:
     // Sub-Class Grid::Axis. 
@@ -96,6 +97,7 @@ namespace Katabatic {
 
     protected:
     // Attributes.
+      Box           _boundingBox;
       Axis          _xGraduations;
       Axis          _yGraduations;
       unsigned int  _rows;
@@ -104,7 +106,7 @@ namespace Katabatic {
 
     // Constructors & Destructors.
     protected:
-                        BaseGrid    ();
+                        BaseGrid    ( const Box& );
       virtual          ~BaseGrid    ();
       virtual void      _postCreate ();
       virtual void      _preDestroy ();
@@ -120,13 +122,14 @@ namespace Katabatic {
   inline DbU::Unit&    BaseGrid::Axis::operator[]    ( unsigned int i ) { return _graduations[i]; }
   inline string        BaseGrid::Axis::_getTypeName  () const { return _TName("BaseGrid::Axis"); }
 
-  inline void         BaseGrid::destroy    () { _preDestroy(); delete this; }
-  inline unsigned int BaseGrid::getColumns () const { return _columns; };
-  inline unsigned int BaseGrid::getRows    () const { return _rows; };
-  inline unsigned int BaseGrid::getRawSize () const { return getColumns() * getRows(); }
-  inline unsigned int BaseGrid::getIndex   ( unsigned int c, unsigned int r ) const { return c+(r*getColumns()); }
-  inline unsigned int BaseGrid::getRow     ( unsigned int i ) const { return i / getColumns(); }
-  inline unsigned int BaseGrid::getColumn  ( unsigned int i ) const { return i % getColumns(); }
+  inline void         BaseGrid::destroy        () { _preDestroy(); delete this; }
+  inline const Box&   BaseGrid::getBoundingBox () const { return _boundingBox; };
+  inline unsigned int BaseGrid::getColumns     () const { return _columns; };
+  inline unsigned int BaseGrid::getRows        () const { return _rows; };
+  inline unsigned int BaseGrid::getRawSize     () const { return getColumns() * getRows(); }
+  inline unsigned int BaseGrid::getIndex       ( unsigned int c, unsigned int r ) const { return c+(r*getColumns()); }
+  inline unsigned int BaseGrid::getRow         ( unsigned int i ) const { return i / getColumns(); }
+  inline unsigned int BaseGrid::getColumn      ( unsigned int i ) const { return i % getColumns(); }
 
   inline const BaseGrid::Axis& BaseGrid::getXGrads () const { return _xGraduations; }
   inline const BaseGrid::Axis& BaseGrid::getYGrads () const { return _yGraduations; }
@@ -166,7 +169,7 @@ namespace Katabatic {
 
     // Constructors & Destructors.
     protected:
-      inline        Grid        ();
+      inline        Grid        ( const Box& );
       virtual      ~Grid        ();
     private:
                     Grid        ( const Grid& );
@@ -187,8 +190,9 @@ namespace Katabatic {
 // Inline Functions.
 
   template<typename GCellT>
-  Grid<GCellT>::Grid () : BaseGrid()
-                        , _gcells()
+  Grid<GCellT>::Grid ( const Box& bb )
+    : BaseGrid(bb)
+    , _gcells ()
   { }