From 7191481dd157b8e1c62b3382a29901ee878757d8 Mon Sep 17 00:00:00 2001
From: Leonardo Florez-Valencia <florez-l@javeriana.edu.co>
Date: Mon, 17 Oct 2016 23:20:49 -0500
Subject: [PATCH] ...

---
 plugins/Widgets/SplineWidget.cxx | 103 ++++++++++++++++++++++++++++++-
 1 file changed, 102 insertions(+), 1 deletion(-)

diff --git a/plugins/Widgets/SplineWidget.cxx b/plugins/Widgets/SplineWidget.cxx
index a1b1538..527138c 100644
--- a/plugins/Widgets/SplineWidget.cxx
+++ b/plugins/Widgets/SplineWidget.cxx
@@ -2,10 +2,12 @@
 #include <cpPlugins/DataObjects/Image.h>
 #include <cpPlugins/DataObjects/Mesh.h>
 #include <cpExtensions/Visualization/WindowLevelImageActor.h>
+#include <cpPlugins_BaseObjects.h>
 
 #include <vtkImageData.h>
 #include <vtkRenderer.h>
 #include <vtkSplineWidget.h>
+#include <vtkParametricSpline.h>
 
 // -------------------------------------------------------------------------
 void cpPluginsWidgets::SplineWidget::
@@ -58,6 +60,9 @@ SplineWidget( )
   this->m_Contour->SetPolys( vtkSmartPointer< vtkCellArray >::New( ) );
   this->m_Contour->SetStrips( vtkSmartPointer< vtkCellArray >::New( ) );
   this->GetOutput( "Output" )->SetVTK( this->m_Contour );
+
+  this->m_Parameters.ConfigureAsBool( "Extend" );
+  this->m_Parameters.SetBool( "Extend", false );
 }
 
 // -------------------------------------------------------------------------
@@ -81,7 +86,103 @@ _GenerateData( )
   auto wdg = this->_CreateVTK< vtkSplineWidget >( );
   if( this->m_Configured )
   {
-    wdg->GetPolyData( this->m_Contour.GetPointer( ) );
+    if( this->m_Parameters.GetBool( "Extend" ) )
+    {
+      wdg->GetPolyData( this->m_Contour.GetPointer( ) );
+
+      typedef itk::Vector< double, 3 > _TVector;
+      typedef std::vector< _TVector > _TVectors;
+
+      unsigned long nPoints = this->m_Contour->GetNumberOfPoints( );
+      unsigned long support = nPoints / 10;
+      _TVectors pp, qp;
+      for( unsigned long i = 0; i < support; ++i )
+      {
+        double p[ 3 ], q[ 3 ];
+        this->m_Contour->GetPoint( i, p );
+        this->m_Contour->GetPoint( nPoints - 1 - i, q );
+
+        _TVector pv, qv;
+        pv[ 0 ] = p[ 0 ];
+        pv[ 1 ] = p[ 1 ];
+        pv[ 2 ] = p[ 2 ];
+        qv[ 0 ] = q[ 0 ];
+        qv[ 1 ] = q[ 1 ];
+        qv[ 2 ] = q[ 2 ];
+        pp.push_back( pv );
+        qp.push_back( qv );
+
+      } // rof
+
+      _TVectors pt, qt;
+      pt.push_back( pp[ 1 ] - pp[ 0 ] );
+      qt.push_back( qp[ 1 ] - qp[ 0 ] );
+      for( unsigned long i = 1; i < support - 1; ++i )
+      {
+        pt.push_back( pp[ i + 1 ] - pp[ i - 1 ] );
+        qt.push_back( qp[ i + 1 ] - qp[ i - 1 ] );
+
+      } // rof
+      pt.push_back( pp[ support - 1 ] - pp[ support - 2 ] );
+      qt.push_back( qp[ support - 1 ] - qp[ support - 2 ] );
+
+      _TVector t0( double( 0 ) ), t1( double( 0 ) );
+      long real0 = 0, real1 = 0;
+      for( unsigned long i = 0; i < support; ++i )
+      {
+        double n0 = pt[ i ].GetNorm( );
+        if( n0 > double( 0 ) )
+        {
+          t0 += pt[ i ] / n0;
+          real0++;
+
+        } // fi
+
+        double n1 = qt[ i ].GetNorm( );
+        if( n1 > double( 0 ) )
+        {
+          t1 += qt[ i ] / n1;
+          real1++;
+
+        } // fi
+
+      } // rof
+
+      if( real0 > 0 )
+        t0 /= double( -real0 );
+      if( real1 > 0 )
+        t1 /= double( -real1 );
+
+      t0 *= ( pp[ 0 ] - qp[ 0 ] ).GetNorm( );
+      t1 *= ( pp[ 0 ] - qp[ 0 ] ).GetNorm( );
+
+      _TVector p0 = pp[ 0 ] + t0;
+      _TVector p1 = qp[ 0 ] + t1;
+
+      vtkSmartPointer< vtkPolyData > cnt = this->m_Contour;
+      this->m_Contour = vtkSmartPointer< vtkPolyData >::New( );
+      this->m_Contour->SetPoints( vtkSmartPointer< vtkPoints >::New( ) );
+      this->m_Contour->SetVerts( vtkSmartPointer< vtkCellArray >::New( ) );
+      this->m_Contour->SetLines( vtkSmartPointer< vtkCellArray >::New( ) );
+      this->m_Contour->SetPolys( vtkSmartPointer< vtkCellArray >::New( ) );
+      this->m_Contour->SetStrips( vtkSmartPointer< vtkCellArray >::New( ) );
+      this->GetOutput( "Output" )->SetVTK( this->m_Contour );
+
+      this->m_Contour->GetPoints( )->
+        InsertNextPoint( p0[ 0 ], p0[ 1 ], p0[ 2 ] );
+      for( unsigned long i = 0; i < nPoints; ++i )
+      {
+        double p[ 3 ];
+        cnt->GetPoints( )->GetPoint( i, p );
+        this->m_Contour->GetPoints( )->InsertNextPoint( p );
+
+      } // rof
+      this->m_Contour->GetPoints( )->
+        InsertNextPoint( p1[ 0 ], p1[ 1 ], p1[ 2 ] );
+      this->m_Contour->Modified( );
+    }
+    else
+      wdg->GetPolyData( this->m_Contour.GetPointer( ) );
   }
   else
   {
-- 
2.45.0