diff --git a/Modules/PlanarFigure/Interactions/mitkPlanarFigureInteractor.cpp b/Modules/PlanarFigure/Interactions/mitkPlanarFigureInteractor.cpp
index 4c27097cc8..3c0bf8668f 100644
--- a/Modules/PlanarFigure/Interactions/mitkPlanarFigureInteractor.cpp
+++ b/Modules/PlanarFigure/Interactions/mitkPlanarFigureInteractor.cpp
@@ -1,950 +1,950 @@
 /*=========================================================================
 
 Program:   Medical Imaging & Interaction Toolkit
 Language:  C++
 Date:      $Date: 2008-10-02 16:21:08 +0200 (Do, 02 Okt 2008) $
 Version:   $Revision: 13129 $
 
 Copyright (c) German Cancer Research Center, Division of Medical and
 Biological Informatics. All rights reserved.
 See MITKCopyright.txt or http://www.mitk.org/copyright.html for details.
 
 This software is distributed WITHOUT ANY WARRANTY; without even
 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 PURPOSE.  See the above copyright notices for more information.
 
 =========================================================================*/
 
 
 #include "mitkPlanarFigureInteractor.h"
 #include "mitkPointOperation.h"
 #include "mitkPositionEvent.h"
 #include "mitkPlanarFigure.h"
 #include "mitkStatusBar.h"
 #include "mitkDataNode.h"
 #include "mitkInteractionConst.h"
 #include "mitkAction.h"
 #include "mitkStateEvent.h"
 #include "mitkOperationEvent.h"
 #include "mitkUndoController.h"
 #include "mitkStateMachineFactory.h"
 #include "mitkStateTransitionOperation.h"
 #include "mitkBaseRenderer.h"
 #include "mitkRenderingManager.h"
 #include "mitkNodePredicateDataType.h"
 #include "mitkNodePredicateOr.h"
 
 
 //how precise must the user pick the point
 //default value
 mitk::PlanarFigureInteractor
 ::PlanarFigureInteractor(const char * type, DataNode* dataNode, int /* n */ )
 : Interactor( type, dataNode ),
 m_Precision( 6.5 ),
 m_MinimumPointDistance( 25.0 ),
 m_IsHovering( false ),
 m_LastPointWasValid( false )
 {
 }
 
 mitk::PlanarFigureInteractor::~PlanarFigureInteractor()
 {
 }
 
 void mitk::PlanarFigureInteractor::SetPrecision( mitk::ScalarType precision )
 {
   m_Precision = precision;
 }
 
 
 void mitk::PlanarFigureInteractor::SetMinimumPointDistance( ScalarType minimumDistance )
 {
   m_MinimumPointDistance = minimumDistance;
 }
 
 
 // Overwritten since this class can handle it better!
 float mitk::PlanarFigureInteractor
 ::CanHandleEvent(StateEvent const* stateEvent) const
 {
   float returnValue = 0.5;
 
 
   // If it is a key event that can be handled in the current state,
   // then return 0.5
   mitk::DisplayPositionEvent const *disPosEvent =
     dynamic_cast <const mitk::DisplayPositionEvent *> (stateEvent->GetEvent());
 
   // Key event handling:
   if (disPosEvent == NULL)
   {
     // Check if the current state has a transition waiting for that key event.
     if (this->GetCurrentState()->GetTransition(stateEvent->GetId())!=NULL)
     {
       return 0.5;
     }
     else
     {
       return 0.0;
     }
   }
 
   mitk::PlanarFigure *planarFigure = dynamic_cast<mitk::PlanarFigure *>(
     m_DataNode->GetData() );
 
   if ( planarFigure != NULL )
   {
     // Give higher priority if this figure is currently selected
     if ( planarFigure->GetSelectedControlPoint() >= 0 )
     {
       return 1.0;
     }
 
   }
   return returnValue;
 }
 
 
 bool mitk::PlanarFigureInteractor
 ::ExecuteAction( Action *action, mitk::StateEvent const *stateEvent )
 {
   bool ok = false;
 
   // Check corresponding data; has to be sub-class of mitk::PlanarFigure
   mitk::PlanarFigure *planarFigure = 
     dynamic_cast< mitk::PlanarFigure * >( m_DataNode->GetData() );
 
   if ( planarFigure == NULL )
   {
     return false;
   }
 
   // Get the timestep to also support 3D+t
   const mitk::Event *theEvent = stateEvent->GetEvent();
   int timeStep = 0;
   mitk::ScalarType timeInMS = 0.0;
 
   if ( theEvent )
   {
     if (theEvent->GetSender() != NULL)
     {
       timeStep = theEvent->GetSender()->GetTimeStep( planarFigure );
       timeInMS = theEvent->GetSender()->GetTime();
     }
   }
 
   // Get Geometry2D of PlanarFigure
   mitk::Geometry2D *planarFigureGeometry =
     dynamic_cast< mitk::Geometry2D * >( planarFigure->GetGeometry( timeStep ) );
 
   // Get the Geometry2D of the window the user interacts with (for 2D point 
   // projection)
   mitk::BaseRenderer *renderer = NULL;
   const Geometry2D *projectionPlane = NULL;
   if ( theEvent )
   {
     renderer = theEvent->GetSender();
     projectionPlane = renderer->GetCurrentWorldGeometry2D();
   }
 
   // TODO: Check if display and PlanarFigure geometries are parallel (if they are PlaneGeometries)
 
 
 
   switch (action->GetActionId())
   {
   case AcDONOTHING:
     ok = true;
     break;
 
   case AcCHECKOBJECT:
     {
       if ( planarFigure->IsPlaced() )
       {
         this->HandleEvent( new mitk::StateEvent( EIDYES, NULL ) );
       }
       else
       {
         this->HandleEvent( new mitk::StateEvent( EIDNO, NULL ) );
       }
       ok = false;
       break;
     }
 
   case AcADD:
     {
       // Invoke event to notify listeners that placement of this PF starts now
       planarFigure->InvokeEvent( StartPlacementPlanarFigureEvent() );
 
       // Use Geometry2D of the renderer clicked on for this PlanarFigure
       mitk::PlaneGeometry *planeGeometry = const_cast< mitk::PlaneGeometry * >(
         dynamic_cast< const mitk::PlaneGeometry * >(
         renderer->GetSliceNavigationController()->GetCurrentPlaneGeometry() ) );
       if ( planeGeometry != NULL )
       {
         planarFigureGeometry = planeGeometry;
         planarFigure->SetGeometry2D( planeGeometry );
       }
       else
       {
         ok = false;
         break;
       }
 
       // Extract point in 2D world coordinates (relative to Geometry2D of
       // PlanarFigure)
       Point2D point2D;
       if ( !this->TransformPositionEventToPoint2D( stateEvent, point2D,
         planarFigureGeometry ) )
       {
         ok = false;
         break;
       }
 
       // Place PlanarFigure at this point
       planarFigure->PlaceFigure( point2D );
 
       // Re-evaluate features
       planarFigure->EvaluateFeatures();
       //this->LogPrintPlanarFigureQuantities( planarFigure );
 
       // Set a bool property indicating that the figure has been placed in
       // the current RenderWindow. This is required so that the same render
       // window can be re-aligned to the Geometry2D of the PlanarFigure later
       // on in an application.
       m_DataNode->SetBoolProperty( "PlanarFigureInitializedWindow", true, renderer );
 
       // Update rendered scene
       renderer->GetRenderingManager()->RequestUpdateAll();
 
       ok = true;
       break;
     }
 
   case AcMOVEPOINT:
     {
       bool isEditable = true;
       m_DataNode->GetBoolProperty( "planarfigure.iseditable", isEditable );
 
       // Extract point in 2D world coordinates (relative to Geometry2D of
       // PlanarFigure)
       Point2D point2D;
       if ( !this->TransformPositionEventToPoint2D( stateEvent, point2D,
         planarFigureGeometry ) || !isEditable )
       {
         ok = false;
         break;
       }
 
       // check if the control points shall be hidden during interaction
       bool hidecontrolpointsduringinteraction = false;
       m_DataNode->GetBoolProperty( "planarfigure.hidecontrolpointsduringinteraction", hidecontrolpointsduringinteraction );
 
       // hide the control points if necessary
       m_DataNode->SetBoolProperty( "planarfigure.drawcontrolpoints", !hidecontrolpointsduringinteraction );
 
       // Move current control point to this point
       planarFigure->SetCurrentControlPoint( point2D );
 
       // Re-evaluate features
       planarFigure->EvaluateFeatures();
       //this->LogPrintPlanarFigureQuantities( planarFigure );
 
       // Update rendered scene
       renderer->GetRenderingManager()->RequestUpdateAll();
 
       ok = true;
       break;
     }
 
 
   case AcCHECKNMINUS1:
     {
       if ( planarFigure->GetNumberOfControlPoints() >=
         planarFigure->GetMaximumNumberOfControlPoints() )
       {
         // Initial placement finished: deselect control point and send an
         // event to notify application listeners
         planarFigure->Modified();
         planarFigure->DeselectControlPoint();
         planarFigure->InvokeEvent( EndPlacementPlanarFigureEvent() );
         planarFigure->InvokeEvent( EndInteractionPlanarFigureEvent() );
         planarFigure->SetProperty( "initiallyplaced", mitk::BoolProperty::New( true ) );
         m_DataNode->SetBoolProperty( "planarfigure.drawcontrolpoints", true );
         m_DataNode->Modified();
         this->HandleEvent( new mitk::StateEvent( EIDYES, stateEvent->GetEvent() ) );
       }
       else
       {
         this->HandleEvent( new mitk::StateEvent( EIDNO, stateEvent->GetEvent() ) );
       }
 
       // Update rendered scene
       renderer->GetRenderingManager()->RequestUpdateAll();
 
       ok = true;
       break;
     }
 
 
   case AcCHECKEQUALS1:
     {
       // NOTE: Action name is a bit misleading; this action checks whether
       // the figure has already the minimum number of required points to
       // be finished (by double-click)
 
       const mitk::PositionEvent *positionEvent =
         dynamic_cast< const mitk::PositionEvent * > ( stateEvent->GetEvent() );
       if ( positionEvent == NULL )
       {
         ok = false;
         break;
       }
 
-      if ( m_LastPointWasValid && planarFigure->GetNumberOfControlPoints() > planarFigure->GetMinimumNumberOfControlPoints()  )
+      if ( planarFigure->GetNumberOfControlPoints() > planarFigure->GetMinimumNumberOfControlPoints()  )
       {
         // Initial placement finished: deselect control point and send an
         // event to notify application listeners
         planarFigure->Modified();
         planarFigure->DeselectControlPoint();
         planarFigure->RemoveLastControlPoint();
         planarFigure->SetProperty( "initiallyplaced", mitk::BoolProperty::New( true ) );
         m_DataNode->SetBoolProperty( "planarfigure.drawcontrolpoints", true );
         m_DataNode->Modified();
         planarFigure->InvokeEvent( EndPlacementPlanarFigureEvent() );
         planarFigure->InvokeEvent( EndInteractionPlanarFigureEvent() );
 
         this->HandleEvent( new mitk::StateEvent( EIDYES, NULL ) );
       }
       else
       {
         this->HandleEvent( new mitk::StateEvent( EIDNO, NULL ) );
       }
 
       // Update rendered scene
       renderer->GetRenderingManager()->RequestUpdateAll();
 
       ok = true;
       break;
     }
 
 
   case AcCHECKPOINT:
     {
       // Check if the distance of the current point to the previously set point in display coordinates
       // is sufficient (if a previous point exists)
 
       // Extract display position
       const mitk::PositionEvent *positionEvent =
         dynamic_cast< const mitk::PositionEvent * > ( stateEvent->GetEvent() );
       if ( positionEvent == NULL )
       {
         ok = false;
         break;
       }
 
       m_LastPointWasValid = IsMousePositionAcceptableAsNewControlPoint( positionEvent, planarFigure );
       if (m_LastPointWasValid)
       {
         this->HandleEvent( new mitk::StateEvent( EIDYES, stateEvent->GetEvent() ) );
       }
       else
       {
         this->HandleEvent( new mitk::StateEvent( EIDNO, stateEvent->GetEvent() ) );
       }
 
       ok = true;
       break;
     }
 
 
   case AcADDPOINT:
     {
       bool selected = false;
       bool isEditable = true;
       m_DataNode->GetBoolProperty("selected", selected);
       m_DataNode->GetBoolProperty( "planarfigure.iseditable", isEditable );
 
       if ( !selected || !isEditable )
       {
         ok = false;
         break;
       }
 
       // Extract point in 2D world coordinates (relative to Geometry2D of
       // PlanarFigure)
       Point2D point2D, projectedPoint;
       if ( !this->TransformPositionEventToPoint2D( stateEvent, point2D,
         planarFigureGeometry ) )
       {
         ok = false;
         break;
       }
 
       // TODO: check segement of polyline we clicked in
       int nextIndex = this->IsPositionOverFigure(
         stateEvent, planarFigure,
         planarFigureGeometry,
         projectionPlane,
         renderer->GetDisplayGeometry(),
         projectedPoint
         );
 
       // Add point as new control point
       renderer->GetDisplayGeometry()->DisplayToWorld( projectedPoint, projectedPoint );
 
       if ( planarFigure->IsPreviewControlPointVisible() )
       {
         point2D = planarFigure->GetPreviewControlPoint();
       }
 
       planarFigure->AddControlPoint( point2D, nextIndex );
 
       if ( planarFigure->IsPreviewControlPointVisible() )
       {
         planarFigure->SelectControlPoint( nextIndex );
         planarFigure->ResetPreviewContolPoint();
       }
 
       // Re-evaluate features
       planarFigure->EvaluateFeatures();
       //this->LogPrintPlanarFigureQuantities( planarFigure );
 
       // Update rendered scene
       renderer->GetRenderingManager()->RequestUpdateAll();
 
       ok = true;
       break;
     }
 
 
   case AcDESELECTPOINT:
     {
       planarFigure->DeselectControlPoint();
 
       // Issue event so that listeners may update themselves
       planarFigure->Modified();
       planarFigure->InvokeEvent( EndInteractionPlanarFigureEvent() );
 
       m_DataNode->SetBoolProperty( "planarfigure.drawcontrolpoints", true );
       m_DataNode->Modified();
 
       // falls through
     }
 
   case AcCHECKHOVERING:
     {
       mitk::Point2D pointProjectedOntoLine;
       int previousControlPoint = mitk::PlanarFigureInteractor::IsPositionOverFigure(
         stateEvent, planarFigure,
         planarFigureGeometry,
         projectionPlane,
         renderer->GetDisplayGeometry(),
         pointProjectedOntoLine
         );
       bool isHovering = ( previousControlPoint != -1 );
 
       int pointIndex = mitk::PlanarFigureInteractor::IsPositionInsideMarker(
         stateEvent, planarFigure,
         planarFigureGeometry,
         projectionPlane,
         renderer->GetDisplayGeometry() );
 
       int initiallySelectedControlPoint = planarFigure->GetSelectedControlPoint();
 
       if ( pointIndex >= 0 )
       {
         // If mouse is above control point, mark it as selected
         planarFigure->SelectControlPoint( pointIndex );
 
         // If mouse is hovering above a marker, it is also hovering above the figure
         isHovering = true;
       }
       else
       {
         // Mouse in not above control point --> deselect point
         planarFigure->DeselectControlPoint();
       }
 
       bool renderingUpdateNeeded = true;
       if ( isHovering )
       {
         if ( !m_IsHovering )
         {
           // Invoke hover event once when the mouse is entering the figure area
           m_IsHovering = true;
           planarFigure->InvokeEvent( StartHoverPlanarFigureEvent() );
 
           // Set bool property to indicate that planar figure is currently in "hovering" mode
           m_DataNode->SetBoolProperty( "planarfigure.ishovering", true );
 
           renderingUpdateNeeded = true;
         }
 
         bool selected = false;
         bool isExtendable = false;
         bool isEditable = true;
         m_DataNode->GetBoolProperty("selected", selected);
         m_DataNode->GetBoolProperty("planarfigure.isextendable", isExtendable);
         m_DataNode->GetBoolProperty( "planarfigure.iseditable", isEditable );
 
         if ( selected && isHovering && isExtendable && pointIndex == -1 && isEditable )
         {
           const mitk::PositionEvent *positionEvent =
             dynamic_cast< const mitk::PositionEvent * > ( stateEvent->GetEvent() );
           if ( positionEvent != NULL )
           {
             renderer->GetDisplayGeometry()->DisplayToWorld( pointProjectedOntoLine, pointProjectedOntoLine );
             planarFigure->SetPreviewControlPoint( pointProjectedOntoLine );
 
             renderingUpdateNeeded = true;
           }
         }
         else
         {
           planarFigure->ResetPreviewContolPoint();
         }
 
         if ( planarFigure->GetSelectedControlPoint() != initiallySelectedControlPoint  )
         {
           // the selected control point has changed -> rendering update necessary
           renderingUpdateNeeded = true;
         }
 
         this->HandleEvent( new mitk::StateEvent( EIDYES, stateEvent->GetEvent() ) );
 
         // Return true: only this interactor is eligible to react on this event
         ok = true;
       }
       else
       {
         if ( m_IsHovering )
         {
           planarFigure->ResetPreviewContolPoint();
 
           // Invoke end-hover event once the mouse is exiting the figure area
           m_IsHovering = false;
           planarFigure->InvokeEvent( EndHoverPlanarFigureEvent() );
 
           // Set bool property to indicate that planar figure is no longer in "hovering" mode
           m_DataNode->SetBoolProperty( "planarfigure.ishovering", false );
 
           renderingUpdateNeeded = true;
         }
 
         this->HandleEvent( new mitk::StateEvent( EIDNO, NULL ) );
 
         // Return false so that other (PlanarFigure) Interactors may react on this
         // event as well
         ok = false;
       }
 
       // Update rendered scene if necessray
       if ( renderingUpdateNeeded )
       {
         renderer->GetRenderingManager()->RequestUpdateAll();
       }
       break;
     }
 
   case AcCHECKSELECTED:
     {
       bool selected = false;
       m_DataNode->GetBoolProperty("selected", selected);
 
       if ( selected )
       {
         this->HandleEvent( new mitk::StateEvent( EIDYES, stateEvent->GetEvent() ) );
       }
       else
       {
         // Invoke event to notify listeners that this planar figure should be selected
         planarFigure->InvokeEvent( SelectPlanarFigureEvent() );
         this->HandleEvent( new mitk::StateEvent( EIDNO, NULL ) );
       }
     }
 
   case AcSELECTPICKEDOBJECT:
     {
       //// Invoke event to notify listeners that this planar figure should be selected
       //planarFigure->InvokeEvent( SelectPlanarFigureEvent() );
 
       // Check if planar figure is marked as "editable"
       bool isEditable = true;
       m_DataNode->GetBoolProperty( "planarfigure.iseditable", isEditable );
 
       int pointIndex = -1;
 
       if ( isEditable )
       {
         // If planar figure is editable, check if mouse is over a control point
         pointIndex = mitk::PlanarFigureInteractor::IsPositionInsideMarker(
           stateEvent, planarFigure,
           planarFigureGeometry,
           projectionPlane,
           renderer->GetDisplayGeometry() );
       }
 
       // If editing is enabled and the mouse is currently over a control point, select it
       if ( pointIndex >= 0 )
       {
         this->HandleEvent( new mitk::StateEvent( EIDYES, stateEvent->GetEvent() ) );
 
         // Return true: only this interactor is eligible to react on this event
         ok = true;
       }
       else
       {
         this->HandleEvent( new mitk::StateEvent( EIDNO, stateEvent->GetEvent() ) );
 
         // Return false so that other (PlanarFigure) Interactors may react on this
         // event as well
         ok = false;
       }
 
       ok = true;
       break;
     }
 
 
   case AcSELECTPOINT:
     {
       // Invoke event to notify listeners that interaction with this PF starts now
       planarFigure->InvokeEvent( StartInteractionPlanarFigureEvent() );
 
       // Reset the PlanarFigure if required
       if ( planarFigure->ResetOnPointSelect() )
       {
         this->HandleEvent( new mitk::StateEvent( EIDYES, stateEvent->GetEvent() ) );
       }
       else
       {
         this->HandleEvent( new mitk::StateEvent( EIDNO, stateEvent->GetEvent() ) );
       }
 
       ok = true;
       break;
     }
 
   case AcREMOVEPOINT:
     {
       bool isExtendable = false;
       m_DataNode->GetBoolProperty("planarfigure.isextendable", isExtendable);
 
       if ( isExtendable )
       {
         int selectedControlPoint = planarFigure->GetSelectedControlPoint();
         planarFigure->RemoveControlPoint( selectedControlPoint );
 
         // Re-evaluate features
         planarFigure->EvaluateFeatures();
         planarFigure->Modified();
 
         m_DataNode->SetBoolProperty( "planarfigure.drawcontrolpoints", true );
         planarFigure->InvokeEvent( EndInteractionPlanarFigureEvent() );
         renderer->GetRenderingManager()->RequestUpdateAll();
         this->HandleEvent( new mitk::StateEvent( EIDYES, NULL ) );
       }
       else
       {
         this->HandleEvent( new mitk::StateEvent( EIDNO, NULL ) );
       }
     }
 
     //case AcMOVEPOINT:
     //case AcMOVESELECTED:
     //  {
     //    // Update the display
     //    renderer->GetRenderingManager()->RequestUpdateAll();
 
     //    ok = true;
     //    break;
     //  }
 
     //case AcFINISHMOVE:
     //  {
     //    ok = true;
     //    break;
     //  }
 
   default:
     return Superclass::ExecuteAction( action, stateEvent );
   }
 
 
 
 
   return ok;
 }
 
 bool mitk::PlanarFigureInteractor::TransformPositionEventToPoint2D(
   const StateEvent *stateEvent, Point2D &point2D,
   const Geometry2D *planarFigureGeometry )
 {
   // Extract world position, and from this position on geometry, if
   // available
   const mitk::PositionEvent *positionEvent = 
     dynamic_cast< const mitk::PositionEvent * > ( stateEvent->GetEvent() );
   if ( positionEvent == NULL )
   {
     return false;
   }
 
   mitk::Point3D worldPoint3D = positionEvent->GetWorldPosition();
 
   // TODO: proper handling of distance tolerance
   if ( planarFigureGeometry->Distance( worldPoint3D ) > 0.1 )
   {
     return false;
   }
 
   // Project point onto plane of this PlanarFigure
   planarFigureGeometry->Map( worldPoint3D, point2D );
   return true;
 }
 
 
 bool mitk::PlanarFigureInteractor::TransformObjectToDisplay(
   const mitk::Point2D &point2D,
   mitk::Point2D &displayPoint,
   const mitk::Geometry2D *objectGeometry,
   const mitk::Geometry2D *rendererGeometry,
   const mitk::DisplayGeometry *displayGeometry ) const
 {
   mitk::Point3D point3D;
 
   // Map circle point from local 2D geometry into 3D world space
   objectGeometry->Map( point2D, point3D );
 
   // TODO: proper handling of distance tolerance
   if ( displayGeometry->Distance( point3D ) < 0.1 )
   {
     // Project 3D world point onto display geometry
     rendererGeometry->Map( point3D, displayPoint );
     displayGeometry->WorldToDisplay( displayPoint, displayPoint );
     return true;
   }
 
   return false;
 }
 
 
 bool mitk::PlanarFigureInteractor::IsPointNearLine(
   const mitk::Point2D& point,
   const mitk::Point2D& startPoint, 
   const mitk::Point2D& endPoint,
   mitk::Point2D& projectedPoint
   ) const
 {
   mitk::Vector2D n1 = endPoint - startPoint;
   n1.Normalize();
 
   // Determine dot products between line vector and startpoint-point / endpoint-point vectors
   double l1 = n1 * (point - startPoint);
   double l2 = -n1 * (point - endPoint);
 
   // Determine projection of specified point onto line defined by start / end point
   mitk::Point2D crossPoint = startPoint + n1 * l1;
   projectedPoint = crossPoint;
 
   // Point is inside encompassing rectangle IF
   // - its distance to its projected point is small enough
   // - it is not further outside of the line than the defined tolerance
   if (((crossPoint.SquaredEuclideanDistanceTo(point) < 20.0) && (l1 > 0.0) && (l2 > 0.0))
       || endPoint.SquaredEuclideanDistanceTo(point) < 20.0 
       || startPoint.SquaredEuclideanDistanceTo(point) < 20.0)
   {
     return true;
   }
 
   return false;
 }
 
 
 int mitk::PlanarFigureInteractor::IsPositionOverFigure(
   const StateEvent *stateEvent, PlanarFigure *planarFigure,
   const Geometry2D *planarFigureGeometry,
   const Geometry2D *rendererGeometry,
   const DisplayGeometry *displayGeometry,
   Point2D& pointProjectedOntoLine ) const
 {
   // Extract display position
   const mitk::PositionEvent *positionEvent = 
     dynamic_cast< const mitk::PositionEvent * > ( stateEvent->GetEvent() );
   if ( positionEvent == NULL )
   {
     return -1;
   }
 
   mitk::Point2D displayPosition = positionEvent->GetDisplayPosition();
 
 
   // Iterate over all polylines of planar figure, and check if
   // any one is close to the current display position
   typedef mitk::PlanarFigure::PolyLineType VertexContainerType;
 
   mitk::Point2D worldPoint2D, displayControlPoint;
   mitk::Point3D worldPoint3D;
 
   for ( unsigned short loop = 0; loop < planarFigure->GetPolyLinesSize(); ++loop )
   {
     const VertexContainerType polyLine = planarFigure->GetPolyLine( loop );
 
     Point2D polyLinePoint;
     Point2D firstPolyLinePoint;
     Point2D previousPolyLinePoint;
 
     bool firstPoint = true;
     for ( VertexContainerType::const_iterator it = polyLine.begin(); it != polyLine.end(); ++it )
     {
       // Get plane coordinates of this point of polyline (if possible)
       if ( !this->TransformObjectToDisplay( it->Point, polyLinePoint,
         planarFigureGeometry, rendererGeometry, displayGeometry ) )
       {
         break; // Poly line invalid (not on current 2D plane) --> skip it
       }
 
       if ( firstPoint )
       {
         firstPolyLinePoint = polyLinePoint;
         firstPoint = false;
       }
       else if ( this->IsPointNearLine( displayPosition, previousPolyLinePoint, polyLinePoint, pointProjectedOntoLine ) )
       {
         // Point is close enough to line segment --> Return index of the segment
         return it->Index;
       }
       previousPolyLinePoint = polyLinePoint;
     }
 
     // For closed figures, also check last line segment
     if ( planarFigure->IsClosed()
       && this->IsPointNearLine( displayPosition, polyLinePoint, firstPolyLinePoint, pointProjectedOntoLine ) )
     {
       return 0; // Return index of first control point
     }
   }
 
   return -1;
 }
 
 
 int mitk::PlanarFigureInteractor::IsPositionInsideMarker(
   const StateEvent *stateEvent, const PlanarFigure *planarFigure,
   const Geometry2D *planarFigureGeometry,
   const Geometry2D *rendererGeometry,
   const DisplayGeometry *displayGeometry ) const
 {
   // Extract display position
   const mitk::PositionEvent *positionEvent = 
     dynamic_cast< const mitk::PositionEvent * > ( stateEvent->GetEvent() );
   if ( positionEvent == NULL )
   {
     return -1;
   }
 
   mitk::Point2D displayPosition = positionEvent->GetDisplayPosition();
 
 
   // Iterate over all control points of planar figure, and check if
   // any one is close to the current display position
   mitk::Point2D worldPoint2D, displayControlPoint;
   mitk::Point3D worldPoint3D;
 
   int numberOfControlPoints = planarFigure->GetNumberOfControlPoints();
   for ( int i=0; i<numberOfControlPoints; i++ )
   {
     Point2D displayControlPoint;
     if ( this->TransformObjectToDisplay( planarFigure->GetControlPoint(i), displayControlPoint,
       planarFigureGeometry, rendererGeometry, displayGeometry ) )
     {
       // TODO: variable size of markers
       if ( displayPosition.SquaredEuclideanDistanceTo( displayControlPoint ) < 20.0 )
       {
         return i;
       }
     }
   }
 
 
   //for ( it = controlPoints.begin(); it != controlPoints.end(); ++it )
   //{
   //  Point2D displayControlPoint;
   //  if ( this->TransformObjectToDisplay( it->Point, displayControlPoint,
   //    planarFigureGeometry, rendererGeometry, displayGeometry ) )
   //  {
   //    // TODO: variable size of markers
   //    if ( (abs(displayPosition[0] - displayControlPoint[0]) < 4 )
   //      && (abs(displayPosition[1] - displayControlPoint[1]) < 4 ) )
   //    {
   //      return index;
   //    }
   //  }
   //}
 
   return -1;
 }
 
 
 void mitk::PlanarFigureInteractor::LogPrintPlanarFigureQuantities( 
   const PlanarFigure *planarFigure )
 {
   MITK_INFO << "PlanarFigure: " << planarFigure->GetNameOfClass();
   for ( unsigned int i = 0; i < planarFigure->GetNumberOfFeatures(); ++i )
   {
     MITK_INFO << "* " << planarFigure->GetFeatureName( i ) << ": "
       << planarFigure->GetQuantity( i ) << " " << planarFigure->GetFeatureUnit( i );
   }
 }
 
 bool
 mitk::PlanarFigureInteractor::IsMousePositionAcceptableAsNewControlPoint(
     const PositionEvent* positionEvent,
     const PlanarFigure* planarFigure )
 {
   assert(positionEvent && planarFigure);
 
   BaseRenderer* renderer = positionEvent->GetSender();
 
   assert(renderer);
 
   // Get the timestep to support 3D+t
   int timeStep( renderer->GetTimeStep( planarFigure ) );
 
   // Get current display position of the mouse
   Point2D currentDisplayPosition = positionEvent->GetDisplayPosition();
 
   // Check if a previous point has been set
   bool tooClose = false;
 
   for( int i=0; i < (int)planarFigure->GetNumberOfControlPoints(); i++ )
   {
     if ( i != planarFigure->GetSelectedControlPoint() )
     {
       // Try to convert previous point to current display coordinates
       mitk::Geometry2D *planarFigureGeometry =
         dynamic_cast< mitk::Geometry2D * >( planarFigure->GetGeometry( timeStep ) );
 
       const Geometry2D *projectionPlane = renderer->GetCurrentWorldGeometry2D();
 
       mitk::Point3D previousPoint3D;
       planarFigureGeometry->Map( planarFigure->GetControlPoint( i ), previousPoint3D );
       if ( renderer->GetDisplayGeometry()->Distance( previousPoint3D ) < 0.1 ) // ugly, but assert makes this work
       {
         mitk::Point2D previousDisplayPosition;
         projectionPlane->Map( previousPoint3D, previousDisplayPosition );
         renderer->GetDisplayGeometry()->WorldToDisplay( previousDisplayPosition, previousDisplayPosition );
 
         double a = currentDisplayPosition[0] - previousDisplayPosition[0];
         double b = currentDisplayPosition[1] - previousDisplayPosition[1];
 
         // If point is to close, do not set a new point
         tooClose = (a * a + b * b < m_MinimumPointDistance );
       }
       if ( tooClose )
         return false; // abort loop early
     }
   }
 
   return !tooClose; // default
 }