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// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#ifndef SWDIRECTGDIELLIPSE_H_
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#define SWDIRECTGDIELLIPSE_H_
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/**
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@file
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@internalComponent
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*/
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#include <e32std.h>
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#include <gdi.h>
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/**
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A utility class to efficiently draw and fill ellipses
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*/
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class TSwDirectGdiEllipse
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{
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public:
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/**
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Enumeration for the ellipse production life cycle
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*/
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enum TEllipseStatus
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{
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/**
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Ellipse has been initialised but has no area
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*/
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EInitialised,
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/**
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The ellipse is drawn as two parabolas. These are in two sectors, the top and bottom
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half of the rectangle. The first sector means the top parabola has been produced.
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*/
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EFirstSector,
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/**
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The parabola that occupies the bottom half of the rectangle has been produced.
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*/
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ESecondSector,
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/**
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The ellipse is complete
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*/
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EComplete,
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/**
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The ellipse has either a height or width of two units or less
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and so takes the appearance of a line
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*/
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ELine
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};
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public:
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void Construct(const TRect& aRect);
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TBool SingleStep(TPoint& aTopLeft,TPoint& aTopRight,TPoint& aBottomLeft,TPoint& aBottomRight);
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TBool NextStep(TPoint& aTopLeft,TPoint& aTopRight,TPoint& aBottomLeft,TPoint& aBottomRight);
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TPoint Intersection(const TRect& aRect,const TPoint& aPoint);
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protected:
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TBool Output(TPoint& aTopLeft,TPoint& aTopRight,TPoint& aBottomLeft,TPoint& aBottomRight);
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protected:
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TEllipseStatus iStatus;
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TInt iA;
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TInt iB;
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TInt64 iASquared;
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TInt64 iBSquared;
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TInt64 iASquBSqu;
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TInt iX;
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TInt iY;
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TInt iXAdj;
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TInt iYAdj;
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TPoint iOffset;
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TInt64 iD1;
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TInt64 iD2;
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};
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#endif /*SWDIRECTGDIELLIPSE_H_*/
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