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+// -*- C++ -*-
+//
+// anchor.h
+//
+// Part of KVIEWSHELL - A framework for multipage text/gfx viewers
+//
+// (C) 2004-2005 Stefan Kebekus
+// Distributed under the GPL
+
+
+#ifndef ANCHOR_H
+#define ANCHOR_H
+
+#include "length.h"
+#include "pageNumber.h"
+
+
+/** \brief Page number and vertical position in physical coordinates
+    
+This very simple class contains a page number and a vertical position
+in physical coordiantes. The vertical position is given by the
+distance from the top of the page. Anchors are completely independent
+of documents, there is no need for a document to exists that contains
+the given page, nor does the page number need to be valid.
+
+@author Stefan Kebekus <kebekus@kde.org>
+@version 1.0 0
+*/
+
+class Anchor {
+ public:
+  /** \brief Constructs an anchor that points to an invalid page */
+  Anchor() {page = 0;}
+  
+  /** \brief Constructs an snchor that points to a given position on a
+      given page
+      
+      The class contains no code to make sure in any way that the page
+      number pg exists, and that page pg, if it exists, is taller than
+      distance_from_top
+
+      @param pg number of the page
+      @param _distance_from_top distance from the top of the page
+  */
+  Anchor(const PageNumber& pg, const Length& _distance_from_top): page(pg), distance_from_top(_distance_from_top) {}
+
+  /** \brief quick validity check for anchors
+      
+  @returns true if the page number is valid, and 0mm <= distance_from_top <= 2m
+  */
+  bool isValid() const {return page.isValid() && (0.0 <= distance_from_top.getLength_in_mm()) &&  (distance_from_top.getLength_in_mm() <= 2000.0);}
+  
+  /** \brief Page number that this anchor point to */
+  PageNumber page;
+  
+  /** \brief Distance from the top of the page in inch */
+  Length   distance_from_top;
+};
+
+
+#endif