/*

* Copyright (c) 2006-2008 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:   ?Description

*

*/

#ifndef __HUIVG10CURVEPATH_H__

#define __HUIVG10CURVEPATH_H__

#include "uiacceltk/HuiCurvePath.h"

#include "HuiVg10RenderPlugin.h"

#include <VG/openvg.h>

/**

 * Curve path that can be drawn using OpenVG 1.0.

 */

NONSHARABLE_CLASS(CHuiVg10CurvePath) : public CHuiCurvePath

    {

public:

    /* Constructors and destructor. */

	/**

	 * Constructor.

	 */

	CHuiVg10CurvePath();

	/**

	 * Second-phase constructor.

	 */

	void ConstructL();

    /** 

     * Destructor.

     */

    virtual ~CHuiVg10CurvePath();

    /* Methods. */

    /** 

     * Resets the path by removing all segments.

     */

    virtual void Reset();

    /**

     * Recalculate the path's vertices and colors. 

     */

    void Update(TReal32 aStartPos, TReal32 aEndPos, 

                TReal32 aAlphaFactor,

                MHuiMappingFunction* aAlphaFunction,

                MHuiMappingFunction* aWidthFunction) __SOFTFP;

    /** 

     * Draws the path.

     *

     * @param aOrigin Offset of drawing in pixels

     * @param aGc Graphics context to use.

     */

    void Draw(const TPoint& aOrigin, CHuiGc* aGc) const;

protected:

    /**

     *  @returns the number of tuples required for 

     *           a given segment.

     */

    TInt SegmentTuples(const TSegment& aSegment) const;

    /**

     *  Reserve space for tuples.

     *

     *  @param aTuplecount  Number of tuples required.

     */

    void SetTupleCountL(TInt aTupleCount);

    /**

     *  Prepare the tuples for a given segment.

     *

     *  @param aSegment         Segment to process.

     *  @param aStart           Start position.

     *  @param aEnd             End position.

     *  @param aIsFinal         ETrue if this is the final 

     *                          segment of the path.

     *  @param aAlphaFactor     Transparency factor.

     *  @param aAlphaFunction   Function of path alpha.

     *  @param aWidthFunction   Function of path width.

     */

    void MakeSegmentTuples(const TSegment& aSegment,

                           TReal32 aStart, TReal32 aEnd,

                           TBool aIsFinal,

                           TReal32 aAlphaFactor,

                           MHuiMappingFunction* aAlphaFunction,

                           MHuiMappingFunction* aWidthFunction);

    /**

     *  Add a single tuple to the path.

     *

     *  @param aPoint       Tuple coordinates.

     *  @param aNormal      Tuple normal (left side).

     *  @param aWidth       Path width.

     *  @param aAlpha       Path transparency.

     */

    void AddTuple(const THuiRealPoint& aPoint,

                  const THuiRealPoint& aNormal,

                  TReal32 aWidth, TReal32 aAlpha);

    /**

     *  Reset the current path.

     */

    void ResetPath();

    /**

     *  Reset the accumulated tuples.

     */

    void ResetTuples();

private:

    /** Path that encloses the whole curve */

    VGPath   iPath;

    /** Coordinates for the path */

    VGfloat* iPathCoords;

    /** Commands for the path */

    VGubyte* iPathCommands;

    /** Last opacity factor used to render the path */

    TReal32 iLastOpacityFactor;

    /** Number of vertex tuples along the path (at least 2). */

    TUint iMaxTupleCount;

    /** Number of vertex tuples used. */

    TUint iUsedTupleCount;

    };

#endif // __HUIVG10CURVEPATH_H__