Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 948 insertions, 0 deletions

diff --git a/kpovmodeler/pmlathe.cpp b/kpovmodeler/pmlathe.cpp
new file mode 100644
index 00000000..f6c3c3c3
--- /dev/null
+++ b/kpovmodeler/pmlathe.cpp
@@ -0,0 +1,948 @@
+/*
+**************************************************************************
+                                 description
+                             --------------------
+    copyright            : (C) 2002 by Andreas Zehender
+    email                : zehender@kde.org
+**************************************************************************
+
+**************************************************************************
+*                                                                        *
+*  This program is free software; you can redistribute it and/or modify  *
+*  it under the terms of the GNU General Public License as published by  *
+*  the Free Software Foundation; either version 2 of the License, or     *
+*  (at your option) any later version.                                   *
+*                                                                        *
+**************************************************************************/
+
+
+#include "pmlathe.h"
+
+#include "pmxmlhelper.h"
+#include "pmlatheedit.h"
+#include "pmmemento.h"
+#include "pmviewstructure.h"
+#include "pm2dcontrolpoint.h"
+#include "pmsplinememento.h"
+#include "pmsplinesegment.h"
+#include "pmdefaults.h"
+#include "pmenumproperty.h"
+#include "pmobjectaction.h"
+
+#include <klocale.h>
+
+const int defaultNumberOfPoints = 4;
+const PMVector defaultPoint[defaultNumberOfPoints] =
+{
+   PMVector( 0.0, 1.0 ),
+   PMVector( 0.5, 0.7 ),
+   PMVector( 0.5, 0.3 ),
+   PMVector( 0.0, 0.0 )
+};
+
+const bool defaultSturm = false;
+const PMLathe::SplineType defaultSplineType = PMLathe::LinearSpline;
+
+PMDefinePropertyClass( PMLathe, PMLatheProperty );
+PMDefineEnumPropertyClass( PMLathe, PMLathe::SplineType, PMSplineTypeProperty );
+
+PMMetaObject* PMLathe::s_pMetaObject = 0;
+PMObject* createNewLathe( PMPart* part )
+{
+   return new PMLathe( part );
+}
+
+class PMPointProperty : public PMPropertyBase
+{
+public:
+   PMPointProperty( )
+         : PMPropertyBase( "splinePoints", PMVariant::Vector )
+   {
+      m_index = 0;
+   }
+   virtual int dimensions( ) const { return 1; }
+   virtual void setIndex( int /*dimension*/, int index )
+   {
+      m_index = index;
+   }
+   virtual int size( PMObject* object, int /*dimension*/ ) const
+   {
+      return ( ( PMLathe* ) object )->numberOfPoints( );
+   }
+protected:
+   virtual bool setProtected( PMObject* obj, const PMVariant& var )
+   {
+      PMLathe* p = ( PMLathe* ) obj;
+      QValueList<PMVector> list = p->points( );
+      QValueList<PMVector>::Iterator it = list.begin( );
+      int i;
+      PMVector v = var.vectorData( );
+      v.resize( 2 );
+
+      for( i = 0; i < m_index && it != list.end( ); ++i )
+         ++it;
+      // expand the list if necessary
+      for( ; i < m_index; ++i )
+         list.insert( it, v );
+      if( it == list.end( ) )
+         it = list.insert( it, v );
+      else
+         *it = v;
+
+      p->setPoints( list );
+      return true;
+   }
+   virtual PMVariant getProtected( const PMObject* obj )
+   {
+      PMLathe* p = ( PMLathe* ) obj;
+      QValueList<PMVector> list = p->points( );
+      QValueList<PMVector>::ConstIterator it = list.at( m_index );
+
+      if( it == list.end( ) )
+      {
+         kdError( PMArea ) << "Range error in PMLathe::PointProperty::get" << endl;
+         return PMVariant( );
+      }
+
+      return PMVariant( *it );
+   }
+
+private:
+   int m_index;
+};
+
+
+int PMLathe::s_rSteps = c_defaultLatheRSteps;
+int PMLathe::s_sSteps = c_defaultLatheSSteps;
+int PMLathe::s_parameterKey = 0;
+
+PMLathe::PMLathe( PMPart* part )
+      : Base( part )
+{
+   int i;
+
+   for( i = 0; i < defaultNumberOfPoints; ++i )
+      m_points.append( defaultPoint[i] );
+   m_splineType = defaultSplineType;
+   m_sturm = defaultSturm;
+}
+
+PMLathe::PMLathe( const PMLathe& l )
+      : Base( l )
+{
+   m_points = l.m_points;
+   m_splineType = l.m_splineType;
+   m_sturm = l.m_sturm;
+}
+
+PMLathe::~PMLathe( )
+{
+}
+
+QString PMLathe::description( ) const
+{
+   return i18n( "lathe" );
+}
+
+void PMLathe::serialize( QDomElement& e, QDomDocument& doc ) const
+{
+   QDomElement data = doc.createElement( "extra_data" );
+   QDomElement p;
+
+   e.setAttribute( "spline_type", m_splineType );
+   e.setAttribute( "sturm", m_sturm );
+
+   QValueList<PMVector>::ConstIterator it;
+   for( it = m_points.begin( ); it != m_points.end( ); ++it )
+   {
+      p = doc.createElement( "point" );
+      p.setAttribute( "vector", ( *it ).serializeXML( ) );
+      data.appendChild( p );
+   }
+
+   e.appendChild( data );
+   Base::serialize( e, doc );
+}
+
+void PMLathe::readAttributes( const PMXMLHelper& h )
+{
+   m_splineType = ( SplineType ) h.intAttribute( "spline_type", defaultSplineType );
+   m_sturm = h.boolAttribute( "sturm", defaultSturm );
+
+   m_points.clear( );
+   PMVector v( 2 );
+
+   QDomElement e = h.extraData( );
+   if( !e.isNull( ) )
+   {
+      QDomNode c = e.firstChild( );
+      while( !c.isNull( ) )
+      {
+         if( c.isElement( ) )
+         {
+            QDomElement ce = c.toElement( );
+            if( ce.tagName( ) == "point" )
+            {
+               QString str = ce.attribute( "vector" );
+               if( !str.isNull( ) )
+               {
+                  v.loadXML( str );
+                  m_points.append( v );
+               }
+            }
+         }
+         c = c.nextSibling( );
+      }
+   }
+
+   Base::readAttributes( h );
+}
+
+PMMetaObject* PMLathe::metaObject( ) const
+{
+   if( !s_pMetaObject )
+   {
+      s_pMetaObject = new PMMetaObject( "Lathe", Base::metaObject( ),
+                                        createNewLathe );
+      s_pMetaObject->addProperty(
+         new PMLatheProperty( "sturm", &PMLathe::setSturm, &PMLathe::sturm ) );
+      PMSplineTypeProperty* p = new PMSplineTypeProperty(
+         "splineType", &PMLathe::setSplineType, &PMLathe::splineType );
+      p->addEnumValue( "LinearSpline", LinearSpline );
+      p->addEnumValue( "QuadraticSpline", QuadraticSpline );
+      p->addEnumValue( "CubicSpline", CubicSpline );
+      p->addEnumValue( "BezierSpline", BezierSpline );
+      s_pMetaObject->addProperty( p );
+      s_pMetaObject->addProperty( new PMPointProperty( ) );
+   }
+   return s_pMetaObject;
+}
+
+void PMLathe::cleanUp( ) const
+{
+   if( s_pMetaObject )
+   {
+      delete s_pMetaObject;
+      s_pMetaObject = 0;
+   }
+   Base::cleanUp( );
+}
+
+void PMLathe::setSplineType( PMLathe::SplineType t )
+{
+   if( m_splineType != t )
+   {
+      if( m_pMemento )
+         m_pMemento->addData( s_pMetaObject, PMSplineTypeID, ( int ) m_splineType );
+      setViewStructureChanged( );
+      m_splineType = t;
+   }
+}
+
+void PMLathe::setSturm( bool s )
+{
+   if( m_sturm != s )
+   {
+      if( m_pMemento )
+         m_pMemento->addData( s_pMetaObject, PMSturmID, m_sturm );
+      m_sturm = s;
+   }
+}
+
+void PMLathe::setPoints( const QValueList<PMVector>& points )
+{
+   if( m_points != points )
+   {
+      if( m_pMemento )
+         ( ( PMSplineMemento* ) m_pMemento )->setSplinePoints( m_points );
+
+      setViewStructureChanged( );
+      m_points = points;
+   }
+}
+
+PMDialogEditBase* PMLathe::editWidget( QWidget* parent ) const
+{
+   return new PMLatheEdit( parent );
+}
+
+void PMLathe::createMemento( )
+{
+   if( m_pMemento )
+      delete m_pMemento;
+   m_pMemento = new PMSplineMemento( this );
+}
+
+void PMLathe::restoreMemento( PMMemento* s )
+{
+   PMSplineMemento* m = ( PMSplineMemento* ) s;
+   PMMementoDataIterator it( s );
+   PMMementoData* data;
+
+   for( ; it.current( ); ++it )
+   {
+      data = it.current( );
+      if( data->objectType( ) == s_pMetaObject )
+      {
+         switch( data->valueID( ) )
+         {
+            case PMSplineTypeID:
+               setSplineType( ( SplineType ) data->intData( ) );
+               break;
+            case PMSturmID:
+               setSturm( data->boolData( ) );
+               break;
+            default:
+               kdError( PMArea ) << "Wrong ID in PMLathe::restoreMemento\n";
+               break;
+         }
+      }
+   }
+   if( m->splinePointsSaved( ) )
+      setPoints( m->splinePoints( ) );
+
+   Base::restoreMemento( s );
+}
+
+
+void PMLathe::createViewStructure( )
+{
+   if( s_sSteps == 0 )
+      s_sSteps = c_defaultLatheSSteps;
+   if( s_rSteps == 0 )
+      s_rSteps = c_defaultLatheRSteps;
+
+   int rSteps = (int)( ( (float)s_rSteps / 2 ) * ( displayDetail( ) + 1 ) );
+   int sSteps = (int)( ( (float)s_sSteps / 2 ) * ( displayDetail( ) + 1 ) );
+
+   int np = m_points.count( );
+   int ns = 0;
+   int i, j, r, si;
+
+   // calculate number of segments
+   switch( m_splineType )
+   {
+      case LinearSpline:
+         ns = np - 1;
+         break;
+      case QuadraticSpline:
+         ns = np - 2;
+         break;
+      case CubicSpline:
+         ns = np - 3;
+         break;
+      case BezierSpline:
+         ns = np / 4;
+         break;
+   }
+
+   // calculate number of points and lines of the view structure
+   int vsp = 0;
+   if( m_splineType != BezierSpline )
+      vsp = ns * sSteps + 1;
+   else
+      vsp = ns * ( sSteps + 1 );
+
+   int vsl = 0;
+   if( m_splineType != BezierSpline )
+      vsl = ( 2 * vsp - 1 ) * rSteps;
+   else
+      vsl = ns * ( ( 2 * sSteps + 1 ) * rSteps );
+
+   vsp *= rSteps;
+
+   if( m_pViewStructure )
+   {
+      if( m_pViewStructure->points( ).size( ) != ( unsigned ) vsp )
+         m_pViewStructure->points( ).resize( vsp );
+      if( m_pViewStructure->lines( ).size( ) != ( unsigned ) vsl )
+         m_pViewStructure->lines( ).resize( vsl );
+   }
+   else
+      m_pViewStructure = new PMViewStructure( vsp, vsl );
+
+
+   // calculate the spline segments
+   QValueList<PMSplineSegment> segments;
+   QValueList<PMVector>::Iterator it1, it2, it3, it4;
+   it1 = m_points.begin( );
+   it2 = it1; ++it2;
+   it3 = it2; ++it3;
+   it4 = it3; ++it4;
+   PMSplineSegment s;
+
+   for( i = 0; i < ns; ++i )
+   {
+      switch( m_splineType )
+      {
+         case LinearSpline:
+            s.calculateLinear( *it1, *it2 );
+            ++it1;
+            ++it2;
+            break;
+         case QuadraticSpline:
+            s.calculateQuadratic( *it1, *it2, *it3 );
+            ++it1;
+            ++it2;
+            ++it3;
+            break;
+         case CubicSpline:
+            s.calculateCubic( *it1, *it2, *it3, *it4 );
+            ++it1;
+            ++it2;
+            ++it3;
+            ++it4;
+            break;
+         case BezierSpline:
+            s.calculateBezier( *it1, *it2, *it3, *it4 );
+            for( j = 0; j < 4; ++j )
+            {
+               ++it1;
+               ++it2;
+               ++it3;
+               ++it4;
+            }
+            break;
+      }
+      segments.append( s );
+   }
+
+   // create the line array
+   if( m_splineType != BezierSpline )
+   {
+      PMLineArray& lines = m_pViewStructure->lines( );
+      int vl = ns * sSteps;
+      int lb = 0;
+      for( i = 0; i < vl + 1; ++i )
+      {
+         for( j = 0; j < rSteps - 1; ++j )
+            lines[lb+j] = PMLine( lb + j, lb + j + 1 );
+         lines[lb+rSteps-1] = PMLine( lb, lb + rSteps - 1 );
+         lb += rSteps;
+      }
+      int pi = 0;
+      for( i = 0; i < vl; ++i )
+      {
+         for( j = 0; j < rSteps; ++j )
+         {
+            lines[lb] = PMLine( pi, pi + rSteps );
+            ++pi;
+            ++lb;
+         }
+      }
+   }
+   else
+   {
+      PMLineArray& lines = m_pViewStructure->lines( );
+      int lb = 0;
+      int pi = 0;
+
+      for( si = 0; si < ns; ++si )
+      {
+         for( i = 0; i < sSteps + 1; ++i )
+         {
+            for( j = 0; j < rSteps - 1; ++j )
+               lines[lb+j] = PMLine( lb + j, lb + j + 1 );
+            lines[lb+rSteps-1] = PMLine( lb, lb + rSteps - 1 );
+            lb += rSteps;
+         }
+      }
+      for( si = 0; si < ns; ++si )
+      {
+         for( i = 0; i < sSteps; ++i )
+         {
+            for( j = 0; j < rSteps; ++j )
+            {
+               lines[lb] = PMLine( pi, pi + rSteps );
+               ++pi;
+               ++lb;
+            }
+         }
+         pi += rSteps;
+      }
+   }
+   // calculate the points
+   PMVector point2, point3;
+   QValueList<PMSplineSegment>::Iterator sit = segments.begin( );
+   int pi = 0;
+
+   double poffset = 1.0 / sSteps;
+   PMMatrix rot = PMMatrix::rotation( 0.0, M_PI * 2.0 / rSteps, 0.0 );
+   PMPointArray& points = m_pViewStructure->points( );
+
+   if( m_splineType != BezierSpline )
+   {
+      for( i = 0; i < ns; ++i, ++sit )
+      {
+         for( j = 0; j < sSteps; ++j )
+         {
+            point2 = ( *sit ).point( poffset * j );
+            point3[0] = point2[0];
+            point3[1] = point2[1];
+            point3[2] = 0.0;
+
+            for( r = 0; r < rSteps; ++r )
+            {
+               points[pi] = PMPoint( point3 );
+               if( r != rSteps - 1 )
+                  point3.transform( rot );
+               ++pi;
+            }
+         }
+         if( i == ns - 1 )
+         {
+            point2 = ( *sit ).point( 1.0 );
+            point3[0] = point2[0];
+            point3[1] = point2[1];
+            point3[2] = 0.0;
+
+            for( r = 0; r < rSteps; ++r )
+            {
+               points[pi] = PMPoint( point3 );
+               if( r != rSteps - 1 )
+                  point3.transform( rot );
+               ++pi;
+            }
+         }
+      }
+   }
+   else
+   {
+      for( i = 0; i < ns; ++i, ++sit )
+      {
+         for( j = 0; j < sSteps + 1; ++j )
+         {
+            point2 = ( *sit ).point( poffset * j );
+            point3[0] = point2[0];
+            point3[1] = point2[1];
+            point3[2] = 0.0;
+
+            for( r = 0; r < rSteps; ++r )
+            {
+               points[pi] = PMPoint( point3 );
+               if( r != rSteps - 1 )
+                  point3.transform( rot );
+               ++pi;
+            }
+         }
+      }
+   }
+}
+
+void PMLathe::controlPoints( PMControlPointList& list )
+{
+   QValueList<PMVector>::Iterator it;
+   int i, d;
+
+   PM2DControlPoint* cp = 0;
+   QPtrList<PM2DControlPoint> tmp[2];
+
+   for( d = 0; d < 2; ++d )
+   {
+      if( m_splineType != BezierSpline )
+      {
+         PM2DControlPoint* firstPoint = 0;
+         PM2DControlPoint* lastPoint = 0;
+
+         for( it = m_points.begin( ), i = 0; it != m_points.end( ); ++it, ++i )
+         {
+            lastPoint = cp;
+            if( d == 0 )
+               cp = new PM2DControlPoint( *it, PM2DControlPoint::PM2DXY, i,
+                                          i18n( "Point %1 (xy)" ).arg( i + 1 ) );
+            else
+               cp = new PM2DControlPoint( *it, PM2DControlPoint::PM2DZY, i,
+                                          i18n( "Point %1 (xy)" ).arg( i + 1 ) );
+
+            if( i == 0 )
+               firstPoint = cp;
+            if( ( i == 1 ) && ( m_splineType != LinearSpline ) )
+               firstPoint->setBasePoint( cp );
+
+            tmp[d].append( cp );
+         }
+         if( m_splineType == CubicSpline )
+            cp->setBasePoint( lastPoint );
+      }
+      else
+      {
+         PM2DControlPoint* helpPoint = 0;
+
+         for( it = m_points.begin( ), i = 0; it != m_points.end( ); ++it, ++i )
+         {
+            int imod4 = i % 4;
+            if( d == 0 )
+               cp = new PM2DControlPoint( *it, PM2DControlPoint::PM2DXY, i,
+                                          i18n( "Point %1 (xy)" ).arg( i + 1 ) );
+            else
+               cp = new PM2DControlPoint( *it, PM2DControlPoint::PM2DZY, i,
+                                          i18n( "Point %1 (xy)" ).arg( i + 1 ) );
+            switch( imod4 )
+            {
+               case 0:
+                  helpPoint = cp;
+                  break;
+               case 1:
+                  cp->setBasePoint( helpPoint );
+                  break;
+               case 2:
+                  helpPoint = cp;
+                  break;
+               case 3:
+                  helpPoint->setBasePoint( cp );
+                  break;
+               default:
+                  break;
+            }
+
+            tmp[d].append( cp );
+         }
+      }
+   }
+
+   QPtrListIterator<PM2DControlPoint> cit1( tmp[0] ), cit2( tmp[1] );
+
+   for( ; cit1.current( ) && cit2.current( ); ++cit1, ++cit2 )
+   {
+      ( *cit1 )->setLatheLink( *cit2 );
+      ( *cit2 )->setLatheLink( *cit1 );
+   }
+   for( cit1.toFirst( ); cit1.current( ); ++cit1 )
+      list.append( *cit1 );
+   for( cit2.toFirst( ); cit2.current( ); ++cit2 )
+      list.append( *cit2 );
+}
+
+void PMLathe::controlPointsChanged( PMControlPointList& list )
+{
+   PMControlPointListIterator it1( list ), it2( list );
+   QValueList<PMVector>::Iterator pit = m_points.begin( );
+   PM2DControlPoint* p1;
+   PM2DControlPoint* p2;
+   bool firstChange = true;
+
+   for( it2 += list.count( ) / 2; it2.current( ); ++it1, ++it2, ++pit )
+   {
+      p1 = ( PM2DControlPoint* ) it1.current( );
+      p2 = ( PM2DControlPoint* ) it2.current( );
+
+      if( p1->changed( ) )
+      {
+         if( firstChange )
+         {
+            if( m_pMemento )
+            {
+               PMSplineMemento* m = ( PMSplineMemento* ) m_pMemento;
+               if( !m->splinePointsSaved( ) )
+                  m->setSplinePoints( m_points );
+            }
+            firstChange = false;
+            setViewStructureChanged( );
+         }
+         p2->setPoint( p1->point( ) );
+         ( *pit ) = p1->point( );
+      }
+      else if( p2->changed( ) )
+      {
+         if( firstChange )
+         {
+            if( m_pMemento )
+            {
+               PMSplineMemento* m = ( PMSplineMemento* ) m_pMemento;
+               if( !m->splinePointsSaved( ) )
+                  m->setSplinePoints( m_points );
+            }
+            firstChange = false;
+            setViewStructureChanged( );
+         }
+         p1->setPoint( p2->point( ) );
+         ( *pit ) = p2->point( );
+      }
+   }
+}
+
+void PMLathe::addObjectActions( const PMControlPointList& /*cp*/,
+                                QPtrList<PMObjectAction>& actions )
+{
+   PMObjectAction* a;
+
+   a = new PMObjectAction( s_pMetaObject, PMSplitSegmentID,
+                           i18n( "Add Point" ) );
+   actions.append( a );
+
+   a = new PMObjectAction( s_pMetaObject, PMJoinSegmentsID,
+                           i18n( "Remove Point" ) );
+   int np = m_points.count( );
+   int minp =  3;
+   switch( m_splineType )
+   {
+      case LinearSpline:
+         minp = 3;
+         break;
+      case QuadraticSpline:
+         minp = 4;
+         break;
+      case CubicSpline:
+         minp = 5;
+         break;
+      case BezierSpline:
+         minp = 8;
+         break;
+   }
+
+   if( np < minp )
+      a->setEnabled( false );
+   actions.append( a );
+}
+
+void PMLathe::objectActionCalled( const PMObjectAction* action,
+                                  const PMControlPointList& cp,
+                                  const QPtrList<PMVector>& cpViewPosition,
+                                  const PMVector& clickPosition )
+{
+   if( action->objectType( ) == s_pMetaObject )
+   {
+      switch( action->actionID( ) )
+      {
+         case PMSplitSegmentID:
+            splitSegment( cp, cpViewPosition, clickPosition );
+            break;
+         case PMJoinSegmentsID:
+            joinSegments( cp, cpViewPosition, clickPosition );
+            break;
+         default:
+            kdError( PMArea ) << "Wrong ID in PMLathe::objectActionCalled\n";
+            break;
+      }
+   }
+   else
+      Base::objectActionCalled( action, cp, cpViewPosition, clickPosition );
+}
+
+void PMLathe::splitSegment( const PMControlPointList& /*cp*/,
+                            const QPtrList<PMVector>& cpViewPosition,
+                            const PMVector& clickPosition )
+{
+   // find nearest segment
+   int nump = cpViewPosition.count( ) / 2 - 1;
+   double abs = 0.0, minabs = 1e10;
+   int ns = -1;
+   int i, j;
+   PMVector mid( 3 ), dist( 2 );
+
+   QPtrListIterator<PMVector> it1( cpViewPosition );
+   QPtrListIterator<PMVector> it2( cpViewPosition );
+   ++it2;
+
+   for( j = 0; j < 2; ++j )
+   {
+      for( i = 0; i < nump; ++i )
+      {
+         bool skip = false;
+         switch( m_splineType )
+         {
+            case LinearSpline:
+            case BezierSpline:
+               break;
+            case QuadraticSpline:
+               if( i == 0 )
+                  skip = true;
+               break;
+            case CubicSpline:
+               if( ( i == 0 ) || ( i == ( nump - 1 ) ) )
+                  skip = true;
+               break;
+         }
+
+         if( !skip )
+         {
+            mid = ( **it1 + **it2 ) / 2.0;
+            dist[0] = mid[0];
+            dist[1] = mid[1];
+            dist -= clickPosition;
+            abs = dist.abs( );
+
+            if( ( minabs > abs ) || ( ns < 0 ) )
+            {
+               minabs = abs;
+               ns = i;
+            }
+         }
+         ++it1;
+         ++it2;
+      }
+      ++it1;
+      ++it2;
+   }
+
+   // add a new segment
+   QValueList<PMVector> newPoints = m_points;
+
+   if( m_splineType == BezierSpline )
+   {
+      ns /= 4;
+      ns *= 4;
+   }
+   QValueList<PMVector>::Iterator it = newPoints.at( ( unsigned ) ns );
+   PMVector p[4];
+   QValueList<PMVector>::Iterator hit = it;
+
+   // calculate the spline segment
+   PMSplineSegment segment;
+   switch( m_splineType )
+   {
+      case LinearSpline:
+         for( i = 0; i < 2; ++i, ++hit )
+            p[i] = *hit;
+         segment.calculateLinear( p[0], p[1] );
+         break;
+      case QuadraticSpline:
+         --hit;
+         for( i = 0; i < 3; ++i, ++hit )
+            p[i] = *hit;
+         segment.calculateQuadratic( p[0], p[1], p[2] );
+         break;
+      case CubicSpline:
+         --hit;
+         for( i = 0; i < 4; ++i, ++hit )
+            p[i] = *hit;
+         segment.calculateCubic( p[0], p[1], p[2], p[3] );
+         break;
+      case BezierSpline:
+         for( i = 0; i < 4; ++i, ++hit )
+            p[i] = *hit;
+         segment.calculateBezier( p[0], p[1], p[2], p[3] );
+         break;
+   }
+
+   mid = segment.point( 0.5 );
+   if( m_splineType != BezierSpline )
+   {
+      ++it;
+      newPoints.insert( it, mid );
+   }
+   else
+   {
+      PMVector end = *it;
+      ++it;
+      *it = end + ( *it - end ) / 2.0;
+      ++it;
+
+      PMVector grad = segment.gradient( 0.5 ) / 4.0;
+
+      newPoints.insert( it, mid - grad );
+      newPoints.insert( it, mid );
+      newPoints.insert( it, mid );
+      newPoints.insert( it, mid + grad );
+
+      ++it;
+      end = *it;
+      --it;
+      *it = end + ( *it - end ) / 2.0;
+   }
+   setPoints( newPoints );
+}
+
+void PMLathe::joinSegments( const PMControlPointList& /*cp*/,
+                            const QPtrList<PMVector>& cpViewPosition,
+                            const PMVector& clickPosition )
+{
+   // find nearest point
+   int nump = cpViewPosition.count( ) / 2;
+   int minp = 0;
+
+   switch( m_splineType )
+   {
+      case LinearSpline:
+         minp = 3;
+         break;
+      case QuadraticSpline:
+         minp = 4;
+         break;
+      case CubicSpline:
+         minp = 5;
+         break;
+      case BezierSpline:
+         minp = 8;
+         break;
+   }
+
+   if( nump < minp )
+   {
+      kdError( PMArea ) << "Not enough points in PMLathe::joinSegments\n";
+      return;
+   }
+
+   double abs = 0.0, minabs = 1e10;
+   int ns = -1;
+   int i, j;
+   PMVector* p;
+   PMVector dist( 2 );
+
+   QPtrListIterator<PMVector> it1( cpViewPosition );
+
+   for( j = 0; j < 2; ++j )
+   {
+      for( i = 0; i < nump; ++i )
+      {
+         p = *it1;
+         dist[0] = (*p)[0];
+         dist[1] = (*p)[1];
+         dist -= clickPosition;
+         abs = dist.abs( );
+
+         if( ( minabs > abs ) || ( ns < 0 ) )
+         {
+            minabs = abs;
+            ns = i;
+         }
+         ++it1;
+      }
+   }
+
+   // join two segments
+   QValueList<PMVector> newPoints = m_points;
+   QValueList<PMVector>::Iterator it;
+
+   if( m_splineType != BezierSpline )
+   {
+      // never remove the first or last point
+      if( ns == 0 )
+         ++ns;
+      if( ns == ( nump - 1 ) )
+         --ns;
+      it = newPoints.at( ns );
+      newPoints.remove( it );
+   }
+   else
+   {
+      ns = ( ns - 2 ) / 4;
+      if( ns < 0 )
+         ns = 0;
+      if( ns >= ( nump / 4 - 1 ) )
+         ns = nump / 4 - 2;
+
+      it = newPoints.at( ns * 4 + 2 );
+      for( i = 0; i < 4; ++i )
+         it = newPoints.remove( it );
+   }
+   setPoints( newPoints );
+}
+
+void PMLathe::setRSteps( int r )
+{
+   if( r >= 4 )
+      s_rSteps = r;
+   else
+      kdDebug( PMArea ) << "PMLathe::setRSteps: R must be greater than 3\n";
+   ++s_parameterKey;
+}
+
+void PMLathe::setSSteps( int s )
+{
+   if( s >= 1 )
+      s_sSteps = s;
+   else
+      kdDebug( PMArea ) << "PMLathe::setSSteps: S must be greater than 0\n";
+   ++s_parameterKey;
+}