diff --git a/slideshow/source/engine/expressionnodefactory.cxx b/slideshow/source/engine/expressionnodefactory.cxx
new file mode 100644
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+++ b/slideshow/source/engine/expressionnodefactory.cxx
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+/*************************************************************************
+ *
+ *  $RCSfile: expressionnodefactory.cxx,v $
+ *
+ *  $Revision: 1.2 $
+ *
+ *  last change: $Author: rt $ $Date: 2004-11-26 18:53:27 $
+ *
+ *  The Contents of this file are made available subject to the terms of
+ *  either of the following licenses
+ *
+ *         - GNU Lesser General Public License Version 2.1
+ *         - Sun Industry Standards Source License Version 1.1
+ *
+ *  Sun Microsystems Inc., October, 2000
+ *
+ *  GNU Lesser General Public License Version 2.1
+ *  =============================================
+ *  Copyright 2000 by Sun Microsystems, Inc.
+ *  901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License version 2.1, as published by the Free Software Foundation.
+ *
+ *  This library 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *  MA  02111-1307  USA
+ *
+ *
+ *  Sun Industry Standards Source License Version 1.1
+ *  =================================================
+ *  The contents of this file are subject to the Sun Industry Standards
+ *  Source License Version 1.1 (the "License"); You may not use this file
+ *  except in compliance with the License. You may obtain a copy of the
+ *  License at http://www.openoffice.org/license.html.
+ *
+ *  Software provided under this License is provided on an "AS IS" basis,
+ *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ *  See the License for the specific provisions governing your rights and
+ *  obligations concerning the Software.
+ *
+ *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ *  Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ *  All Rights Reserved.
+ *
+ *  Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+
+// must be first
+#include <canvas/debug.hxx>
+#include <expressionnodefactory.hxx>
+
+#ifndef _CANVAS_VERBOSETRACE_HXX
+#include <canvas/verbosetrace.hxx>
+#endif
+
+#ifndef _BGFX_MATRIX_B2DHOMMATRIX_HXX
+#include <basegfx/matrix/b2dhommatrix.hxx>
+#endif
+#ifndef _BGFX_POINT_B2DPOINT_HXX
+#include <basegfx/point/b2dpoint.hxx>
+#endif
+
+#include <functional>
+#include <algorithm>
+
+
+/* Implementation of ExpressionNodeFactory class */
+
+namespace presentation
+{
+    namespace internal
+    {
+        namespace
+        {
+            class ConstantValueExpression : public ExpressionNode
+            {
+            public:
+                ConstantValueExpression( double rValue ) :
+                    maValue( rValue )
+                {
+                }
+
+                virtual double operator()( double t ) const
+                {
+                    return maValue;
+                }
+
+                virtual bool isConstant() const
+                {
+                    return true;
+                }
+
+            private:
+                double  maValue;
+            };
+
+            class TValueExpression : public ExpressionNode
+            {
+            public:
+                TValueExpression()
+                {
+                }
+
+                virtual double operator()( double t ) const
+                {
+                    return t;
+                }
+
+                virtual bool isConstant() const
+                {
+                    return false;
+                }
+            };
+
+            /** Base class for following binary functions (*+-/)
+
+                Does not pay off to have all this as a template, since
+                we'd have to hold the functor as a member (+33% object
+                size).
+             */
+            class BinaryExpressionBase : public ExpressionNode
+            {
+            public:
+                BinaryExpressionBase( const ExpressionNodeSharedPtr&    rFirstArg,
+                                      const ExpressionNodeSharedPtr&    rSecondArg ) :
+                    mpFirstArg( rFirstArg ),
+                    mpSecondArg( rSecondArg )
+                {
+                }
+
+                virtual bool isConstant() const
+                {
+                    return
+                        mpFirstArg->isConstant() &&
+                        mpSecondArg->isConstant();
+                }
+
+            protected:
+                ExpressionNodeSharedPtr mpFirstArg;
+                ExpressionNodeSharedPtr mpSecondArg;
+            };
+
+            class PlusExpression : public BinaryExpressionBase
+            {
+            public:
+                PlusExpression( const ExpressionNodeSharedPtr&  rFirstArg,
+                                const ExpressionNodeSharedPtr&  rSecondArg ) :
+                    BinaryExpressionBase( rFirstArg, rSecondArg )
+                {
+                }
+
+                virtual double operator()( double t ) const
+                {
+                    return (*mpFirstArg)(t) + (*mpSecondArg)(t);
+                }
+            };
+
+            class MinusExpression : public BinaryExpressionBase
+            {
+            public:
+                MinusExpression( const ExpressionNodeSharedPtr& rFirstArg,
+                                 const ExpressionNodeSharedPtr& rSecondArg ) :
+                    BinaryExpressionBase( rFirstArg, rSecondArg )
+                {
+                }
+
+                virtual double operator()( double t ) const
+                {
+                    return (*mpFirstArg)(t) - (*mpSecondArg)(t);
+                }
+            };
+
+            class MultipliesExpression : public BinaryExpressionBase
+            {
+            public:
+                MultipliesExpression( const ExpressionNodeSharedPtr&    rFirstArg,
+                                      const ExpressionNodeSharedPtr&    rSecondArg ) :
+                    BinaryExpressionBase( rFirstArg, rSecondArg )
+                {
+                }
+
+                virtual double operator()( double t ) const
+                {
+                    return (*mpFirstArg)(t) * (*mpSecondArg)(t);
+                }
+            };
+
+            class DividesExpression : public BinaryExpressionBase
+            {
+            public:
+                DividesExpression( const ExpressionNodeSharedPtr&   rFirstArg,
+                                   const ExpressionNodeSharedPtr&   rSecondArg ) :
+                    BinaryExpressionBase( rFirstArg, rSecondArg )
+                {
+                }
+
+                virtual double operator()( double t ) const
+                {
+                    return (*mpFirstArg)(t) / (*mpSecondArg)(t);
+                }
+            };
+
+            class ComposedExpression : public BinaryExpressionBase
+            {
+            public:
+                ComposedExpression( const ExpressionNodeSharedPtr&  rFirstArg,
+                                    const ExpressionNodeSharedPtr&  rSecondArg ) :
+                    BinaryExpressionBase( rFirstArg, rSecondArg )
+                {
+                }
+
+                virtual double operator()( double t ) const
+                {
+                    return (*mpFirstArg)( (*mpSecondArg)(t) );
+                }
+            };
+
+            class MinExpression : public BinaryExpressionBase
+            {
+            public:
+                MinExpression( const ExpressionNodeSharedPtr&   rFirstArg,
+                               const ExpressionNodeSharedPtr&   rSecondArg ) :
+                    BinaryExpressionBase( rFirstArg, rSecondArg )
+                {
+                }
+
+                virtual double operator()( double t ) const
+                {
+                    return ::std::min( (*mpFirstArg)(t), (*mpSecondArg)(t) );
+                }
+            };
+
+            class MaxExpression : public BinaryExpressionBase
+            {
+            public:
+                MaxExpression( const ExpressionNodeSharedPtr&   rFirstArg,
+                               const ExpressionNodeSharedPtr&   rSecondArg ) :
+                    BinaryExpressionBase( rFirstArg, rSecondArg )
+                {
+                }
+
+                virtual double operator()( double t ) const
+                {
+                    return ::std::max( (*mpFirstArg)(t), (*mpSecondArg)(t) );
+                }
+            };
+        }
+
+        ExpressionNodeSharedPtr ExpressionNodeFactory::createConstantValueExpression( double rConstantValue )
+        {
+            return ExpressionNodeSharedPtr( new ConstantValueExpression(rConstantValue) );
+        }
+
+        ExpressionNodeSharedPtr ExpressionNodeFactory::createValueTExpression()
+        {
+            return ExpressionNodeSharedPtr( new TValueExpression() );
+        }
+
+        ExpressionNodeSharedPtr ExpressionNodeFactory::createPlusExpression( const ExpressionNodeSharedPtr& rLHS,
+                                                                             const ExpressionNodeSharedPtr& rRHS )
+        {
+            return ExpressionNodeSharedPtr( new PlusExpression(rLHS, rRHS) );
+        }
+
+        ExpressionNodeSharedPtr ExpressionNodeFactory::createMinusExpression( const ExpressionNodeSharedPtr&    rLHS,
+                                                                              const ExpressionNodeSharedPtr&    rRHS )
+        {
+            return ExpressionNodeSharedPtr( new MinusExpression(rLHS, rRHS) );
+        }
+
+        ExpressionNodeSharedPtr ExpressionNodeFactory::createMultipliesExpression( const ExpressionNodeSharedPtr&   rLHS,
+                                                                                   const ExpressionNodeSharedPtr&   rRHS )
+        {
+            return ExpressionNodeSharedPtr( new MultipliesExpression(rLHS, rRHS) );
+        }
+
+        ExpressionNodeSharedPtr ExpressionNodeFactory::createDividesExpression( const ExpressionNodeSharedPtr&  rLHS,
+                                                                                const ExpressionNodeSharedPtr&  rRHS )
+        {
+            return ExpressionNodeSharedPtr( new DividesExpression(rLHS, rRHS) );
+        }
+
+        ExpressionNodeSharedPtr ExpressionNodeFactory::createComposedExpression  ( const ExpressionNodeSharedPtr&   rOuterFunction,
+                                                                                   const ExpressionNodeSharedPtr&   rInnerFunction )
+        {
+            return ExpressionNodeSharedPtr( new ComposedExpression(rOuterFunction, rInnerFunction) );
+        }
+
+        ExpressionNodeSharedPtr ExpressionNodeFactory::createMinExpression   ( const ExpressionNodeSharedPtr&   rOuterFunction,
+                                                                               const ExpressionNodeSharedPtr&   rInnerFunction )
+        {
+            return ExpressionNodeSharedPtr( new MinExpression(rOuterFunction, rInnerFunction) );
+        }
+
+        ExpressionNodeSharedPtr ExpressionNodeFactory::createMaxExpression   ( const ExpressionNodeSharedPtr&   rOuterFunction,
+                                                                               const ExpressionNodeSharedPtr&   rInnerFunction )
+        {
+            return ExpressionNodeSharedPtr( new MaxExpression(rOuterFunction, rInnerFunction) );
+        }
+
+    }
+}