/*

* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Graphics Extension Library header file

*

*/

#ifndef GFXFLATTENINGPATHITERATOR_H

#define GFXFLATTENINGPATHITERATOR_H

#include <e32base.h>

#include <e32std.h>

#include "GfxFloatFixPt.h"

#include "GfxPathIterator.h"

class TGfxAffineTransform;

class MGfxShape;

/**

 * This class provides the methods to smooth a path.

 *

 *  @lib Gfx2D.lib

 *  @since 1.0

 */

class CGfxFlatteningPathIterator : public CGfxPathIterator

    {

    public:

        /**

         * Two-phase constructor.

         *

         * @since 1.0

         * @param aSrc : source of path of flatten

         * @param aAt : transform to apply.

         * @param aFlatness : degree of flattening to apply.

         * @param aLimit : maximum number of points used for flattening.

         * @return

         */

         static CGfxFlatteningPathIterator*     NewL( MGfxShape* aSrc,

                                                              TGfxAffineTransform* aAt,

                                                              TInt32 aLimit );

        /**

         * Destructor

         *

         * @since 1.0

         * @return

         */

         virtual                                ~CGfxFlatteningPathIterator();

        /**

         * Set the degree of flattening to apply.

         *

         * @since 1.0

         * @param aFlatness : degree of flattening.

         * @return

         */

         void                                   SetFlatness( TFloatFixPt& aFlatness );

        /**

         * Set the recursion level.

         *

         * @since 1.0

         * @param aLimit : recursion level.

         * @return

         */

         void                                   SetRecursionLimit( TInt32 aLimit );

        /**

         * Get the flattening level..

         *

         * @since 1.0

         * @param aLimit : recursion level.

         * @return flattening value.

         */

         TFloatFixPt                                 Flatness();

        /**

         * Get the recursion level.

         *

         * @since 1.0

         * @return the recursion level.

         */

         TInt32                                 RecursionLimit();

        /**

         * Get the points defining the current segment of iteration.

         *

         * @since 1.0

         * @param aCoords : array to store segment points.

         * @return segment type.

         */

         TGfxSegType                            CurrentSegment( TFloatFixPt* aCoords );

        /**

         * Determine wether the end has been reached.

         *

         * @since 1.0

         * @return true, if end of iterator reached.

         */

         TBool                                  IsDone();

        /**

         * Cycle to the next segment of this iterator.

         *

         * @since 1.0

         * @return

         */

         void                                   NextL();

        /**

         * Create a polygon from iterator.  This method is does nothing.

         *

         * @since 1.0

         * @return

         */

         void PolygonizeL( CGfxEdgeListP* aRenderer, TInt aFlatness );

    private:

        /**

         * Constructor

         *

         * @since 1.0

         * @param aFlatness : degree of flattening to apply.

         * @param aLimit : maximum number of points used for flattening.

         * @return

         */

                            CGfxFlatteningPathIterator( TInt32 aLimit );

        /**

         * Second phase of constrction.

         *

         * @since 1.0

         * @param aSrc : source of path of flatten

         * @param aAt : transform to apply.

         * @return

         */

        void                ConstructL( MGfxShape* aSrc,

                                        TGfxAffineTransform* aAt );

        /**

         * Create a quadratic sub-curve.

         *

         * @since 1.0

         * @param aCtrlPoints : quadratic control points.

         * @return

         */

        void                CreateSubcurveQuadL( RArray<TFloatFixPt>* aCtrlPoints );

        /**

         * Create a cubic sub-curve.

         *

         * @since 1.0

         * @param aCtrlPoints : cubic control points.

         * @return

         */

        void                CreateSubcurveCubicL( RArray<TFloatFixPt>* aCtrlPoints );

    private:

        RArray<TFloatFixPt>*     iCoords;

        TInt32              iIdx;

        CGfxPathIterator*   iSrc;

        TFloatFixPt              iLastX;

        TFloatFixPt              iLastY;

        TGfxSegType         iSegType;

        TBool               iIsDone;

        TInt32              iLimit;

        TFloatFixPt              iFlatness;

    };

#endif      // GFXFLATTENINGPATHITERATOR_H