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#ifndef _CPPCANVAS_CANVAS_HXX
#define _CPPCANVAS_CANVAS_HXX

#include <com/sun/star/uno/Reference.hxx>

#include <boost/shared_ptr.hpp>
#include <cppcanvas/font.hxx>
#include <cppcanvas/color.hxx>

namespace rtl
{
    class OUString;
}

namespace basegfx
{
    class B2DHomMatrix;
    class B2DPolyPolygon;
}

namespace com { namespace sun { namespace star { namespace rendering 
{
    class  XCanvas;
    struct ViewState;
} } } }


/* Definition of BitmapCanvas */

namespace cppcanvas
{
    class PolyPolygon;
    class Canvas;

    // forward declaration, since PolyPolygon also references Canvas
    typedef ::boost::shared_ptr< PolyPolygon > PolyPolygonSharedPtr;

    // forward declaration, since cloneCanvas() also references Canvas
    typedef ::boost::shared_ptr< Canvas > CanvasSharedPtr;

    /** Canvas interface
     */
    class Canvas
    {
    public:
        enum 
        { 
            /** Extra pixel used when canvas anti-aliases.

            	Enlarge the bounding box of drawing primitives by this
            	amount in both dimensions, and on both sides of the
            	bounds, to account for extra pixel touched outside the
            	actual primitive bounding box, when the canvas
            	performs anti-aliasing.
             */
            ANTIALIASING_EXTRA_SIZE=2
    	};

        virtual ~Canvas() {}

        virtual void 						     setTransformation( const ::basegfx::B2DHomMatrix& rMatrix ) = 0;
        virtual ::basegfx::B2DHomMatrix          getTransformation() const = 0;

        virtual void                             setClip( const ::basegfx::B2DPolyPolygon& rClipPoly ) = 0;
        virtual void                             setClip() = 0;

        /** Get current clip 

            @return NULL, if no clip is set, otherwise the current clip poly-polygon
         */
        virtual ::basegfx::B2DPolyPolygon const* getClip() 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
        virtual ::com::sun::star::uno::Reference< 
            ::com::sun::star::rendering::XCanvas > 			getUNOCanvas() const = 0;
        virtual ::com::sun::star::rendering::ViewState	 	getViewState() const = 0;
    };

}

#endif /* _CPPCANVAS_CANVAS_HXX */
