diff --git a/cppcanvas/inc/cppcanvas/canvas.hxx b/cppcanvas/inc/cppcanvas/canvas.hxx
index bb48bbb1ac24..7d1040bc3416 100644
--- a/cppcanvas/inc/cppcanvas/canvas.hxx
+++ b/cppcanvas/inc/cppcanvas/canvas.hxx
@@ -4,9 +4,9 @@
  *
  *  $RCSfile: canvas.hxx,v $
  *
- *  $Revision: 1.8 $
+ *  $Revision: 1.9 $
  *
- *  last change: $Author: kz $ $Date: 2005-11-02 13:38:25 $
+ *  last change: $Author: obo $ $Date: 2007-07-17 15:23:11 $
  *
  *  The Contents of this file are made available subject to
  *  the terms of GNU Lesser General Public License Version 2.1.
@@ -102,17 +102,24 @@ namespace cppcanvas
 
         virtual ~Canvas() {}
 
-        virtual void                        setTransformation( const ::basegfx::B2DHomMatrix& rMatrix ) = 0;
-        virtual ::basegfx::B2DHomMatrix     getTransformation() const = 0;
+        virtual void                             setTransformation( const ::basegfx::B2DHomMatrix& rMatrix ) = 0;
+        virtual ::basegfx::B2DHomMatrix          getTransformation() const = 0;
 
-        virtual void                        setClip( const ::basegfx::B2DPolyPolygon& rClipPoly ) = 0;
-        virtual ::basegfx::B2DPolyPolygon   getClip() const = 0;
+        virtual void                             setClip( const ::basegfx::B2DPolyPolygon& rClipPoly ) = 0;
+        virtual void                             setClip() = 0;
 
-        virtual FontSharedPtr               createFont( const ::rtl::OUString& rFontName, const double& rCellSize ) const = 0;
+        /** Get current clip
 
-        virtual ColorSharedPtr              createColor() const = 0;
+            @return NULL, if no clip is set, otherwise the current clip poly-polygon
+         */
+        virtual ::basegfx::B2DPolyPolygon const* getClip() const = 0;
 
-        virtual CanvasSharedPtr             clone() const = 0;
+        virtual FontSharedPtr                    createFont( const ::rtl::OUString& rFontName, const double& rCellSize ) const = 0;
+
+        virtual ColorSharedPtr                   createColor() const = 0;
+
+        virtual CanvasSharedPtr                  clone() const = 0;
+        virtual void                             clear() const = 0;
 
         // this should be considered private. if RTTI gets enabled
         // someday, remove that to a separate interface