// Copyright (c) 2007-2009 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:

//

#ifndef SWDIRECTGDIELLIPSE_H_

#define SWDIRECTGDIELLIPSE_H_

/**

@file

@internalComponent

*/

#include <e32std.h>

#include <gdi.h>

/**

A utility class to efficiently draw and fill ellipses

*/

class TSwDirectGdiEllipse

	{

public:

	/**	

	Enumeration for the ellipse production life cycle

	*/

	enum TEllipseStatus

		{

		/**

		Ellipse has been initialised but has no area

		*/

		EInitialised,

		/**

		The ellipse is drawn as two parabolas. These are in two sectors, the top and bottom

		half of the rectangle. The first sector means the top parabola has been produced.

		*/

		EFirstSector,

		/**

		The parabola that occupies the bottom half of the rectangle has been produced. 

		*/

		ESecondSector,

		/**

		The ellipse is complete

		*/

		EComplete,

		/**

		The ellipse has either a height or width of two units or less

		and so takes the appearance of a line

		*/

		ELine

		};

public:

	void Construct(const TRect& aRect);

	TBool SingleStep(TPoint& aTopLeft,TPoint& aTopRight,TPoint& aBottomLeft,TPoint& aBottomRight);

	TBool NextStep(TPoint& aTopLeft,TPoint& aTopRight,TPoint& aBottomLeft,TPoint& aBottomRight);

	TPoint Intersection(const TRect& aRect,const TPoint& aPoint);

protected:

	TBool Output(TPoint& aTopLeft,TPoint& aTopRight,TPoint& aBottomLeft,TPoint& aBottomRight);

protected:

	TEllipseStatus iStatus;

	TInt iA;

	TInt iB;

	TInt64 iASquared;

	TInt64 iBSquared;

	TInt64 iASquBSqu;

	TInt iX;

	TInt iY;

	TInt iXAdj;

	TInt iYAdj;

	TPoint iOffset;

	TInt64 iD1;

	TInt64 iD2;

	};

#endif /*SWDIRECTGDIELLIPSE_H_*/