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diff --git a/kviewshell/simplePageSize.h b/kviewshell/simplePageSize.h
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+// -*- C++ -*-
+//
+// simplePageSize.h
+//
+// Part of KVIEWSHELL - A framework for multipage text/gfx viewers
+//
+// (C) 2002-2004 Stefan Kebekus
+// Distributed under the GPL
+
+
+#ifndef SIMPLEPAGESIZE_H
+#define SIMPLEPAGESIZE_H
+
+#include "length.h"
+
+#include <qsize.h>
+
+class QString;
+class QStringList;
+
+
+/** \brief This class represents phyiscal page sizes.
+
+This class represents page sizes. It contains nothing but two numbers,
+the page width, and page height, and a few utility functions that
+convert page sizes to pixel sizes and to compute the aspect ratio. A
+page with width<=1mm or height<=1mm is considered invalid. pageSize is
+a more elaborate class that is derived from SimplePageSize and knows
+about standard paper sizes.
+
+@author Stefan Kebekus <[email protected]>
+@version 1.0 0
+*/
+
+class SimplePageSize
+{
+ public:
+  /** Constructs an invalid SimplePageSize, with size 0x0mm */
+  SimplePageSize() { pageWidth.setLength_in_mm(0.0); pageHeight.setLength_in_mm(0.0); }
+
+  /** Constructs a SimplePagesize with given page width and height in
+      mm. Recall that if width or height is less or equal than 1mm,
+      the page size is considered 'invalid' by the isValid()
+      method.
+      
+      @param width
+      @param height
+  */
+  SimplePageSize(const Length& width, const Length& height) { pageWidth = width; pageHeight = height; }
+
+  /** \brief Sets the page width and height
+      
+  If width or height is less or equal than 1mm, the page size is
+  considered 'invalid' by the isValid() method.
+  
+  @param width
+  @param height
+  */
+  virtual void setPageSize(const Length& width, const Length& height) { pageWidth = width; pageHeight = height; }
+
+  /** \brief Returns the page width. */
+  Length width() const { return pageWidth; }
+
+  /** \brief Returns the page height. */
+  Length height() const { return pageHeight; }
+
+  /** \brief Aspect ratio
+
+  @returns if the paper size is valid, this method returns the ratio
+  width/height. Returns 1.0 otherwise. */
+  double      aspectRatio() const { return isValid() ? (pageWidth/pageHeight) : 1.0; }
+
+  /** \brief Converts the physical page size to a pixel size
+
+  @param resolution in dots per inch
+
+  @returns the pixel size, represented by a QSize. If the page size is
+      invalid, the result is undefined. */
+  QSize       sizeInPixel(double resolution) const {return QSize( (int)(resolution*pageWidth.getLength_in_inch() + 0.5), 
+								  (int)(resolution*pageHeight.getLength_in_inch() + 0.5)); }
+
+  /** \brief Zoom value required to scale to a certain height
+
+  If the pageSize is valid, this method returns the zoom value
+  required to scale the page size down to 'height' pixels on the
+  currently used display. The method uses QPaintDevice::x11AppDpiY()
+  to find the resolution of the display. If the pageSize is invalid,
+  an error message is printed, and an undefined value is returned.
+      
+  @param height target height in pixels
+
+  @returns the zoom value required to scale the page size down to
+  'height' pixels. If the pageSize is invalid, an undefined value is
+  returned.
+  */
+  double      zoomForHeight(Q_UINT32 height) const;
+  
+  /** \brief Zoom value required to scale to a certain height 
+
+  If the pageSize is valid, this method returns the zoom value
+  required to scale the page size down to 'width' pixels on the
+  currently used display. The method uses QPaintDevice::x11AppDpiX()
+  to find the resolution of the display. If the pageSize is invalid,
+  an error message is printed, and an undefined value is returned.
+  
+  @param width target width in pixels
+  
+  @returns the zoom value required to scale the page size down to
+  'width' pixels. If the pageSize is invalid, an undefined value is
+  returned.
+  */
+  double      zoomForWidth(Q_UINT32 width) const;
+
+  /** \brief Returns a zoom to fit into a certain page size
+
+  This method computes the larget zoom value such that *this, zoomed
+  by the computed values fits into the page size 'target'. If *this or
+  if target are invalid, or is this->isSmall() is true, an undefined
+  value is returned. If height or width of this is nearly 0.0, a
+  floating point exception may occur.
+  */
+  double      zoomToFitInto(const SimplePageSize &target) const;
+  
+  /** \brief Validity check
+      
+  @returns 'True' if the page width and height are both larger than
+  1mm */
+  bool isValid() const { return ( (pageWidth.getLength_in_mm() > 1.0) && (pageHeight.getLength_in_mm() > 1.0) ); }
+
+  /** \brief Validity check: 
+      
+  @returns 'True' if the page ares is less than 1.0 square mm
+  */
+  bool isSmall() const { return (pageWidth.getLength_in_mm()*pageHeight.getLength_in_mm() < 1.0); }
+  
+  /** \brief Approximate equality
+
+  @param size pageSize object to compare this object with
+
+  @returns 'True' if height and width of the two obejcts differ by at
+      most 2mm, 'false' otherwise
+  */
+  bool isNearlyEqual(const SimplePageSize &size) const {return (pageWidth.isNearlyEqual(size.pageWidth) && pageHeight.isNearlyEqual(size.pageHeight)); }
+
+  /** Test if paper size is higher than wide
+
+  @returns 'True' if the paper size is higher than wide
+   */
+  bool isPortrait() const { return (pageHeight >= pageWidth);}
+
+  /** Rotates by 90 degrees
+
+  @returns a SimplePageSize with height and width swapped. The
+  original instance is unchanged.
+   */
+  SimplePageSize rotate90() const { return  SimplePageSize(pageHeight, pageWidth);}
+  
+ protected:
+  Length pageWidth;
+  Length pageHeight;
+};
+
+
+#endif