/*
* Copyright (c) 2006-2007 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: Definition of CHuiMatrixStack. CHuiMatrixStack is a stack of
* 2D transformation matrices.
*
*/
#ifndef __HUIMATRIXSTACK_H__
#define __HUIMATRIXSTACK_H__
#include <e32base.h>
#include "uiacceltk/HuiRealPoint.h"
/**
* Stack of 2D transformation matrices.
*/
NONSHARABLE_CLASS(CHuiMatrixStack) : public CBase
{
public:
/** 2D transformation matrix. */
struct TMatrix
{
public:
TReal32 iMatrix[9];
/** Matrix is an identity matrix. Multiplication can be skipped. */
TBool iIsIdentity;
public:
/** Constructor that initializes the matrix as an identity matrix. */
IMPORT_C TMatrix();
/**
* Multiplies this matrix with another one. Result is stored in this
* matrix.
*
* @param aOther Matrix to multiply with.
*/
void Multiply(const TMatrix& aOther);
/**
* Multiplies a point with the matrix.
*
* @param aPoint 2D point. Modified.
*/
IMPORT_C void Multiply(THuiRealPoint& aPoint) const;
};
public:
/* Constructors and destructor. */
IMPORT_C static CHuiMatrixStack* NewL();
static CHuiMatrixStack* NewLC();
/**
* Destructor.
*/
virtual ~CHuiMatrixStack();
/* Methods. */
IMPORT_C TInt Count() const;
IMPORT_C TMatrix& Current();
/**
* @return Error code.
*/
IMPORT_C TInt Push();
IMPORT_C void Pop();
IMPORT_C void LoadIdentity();
IMPORT_C void Multiply(const TMatrix& aMatrix);
protected:
/* Constructors. */
CHuiMatrixStack();
void ConstructL();
private:
// Typedef for convenience.
typedef RArray<TMatrix> RMatrixStack;
RMatrixStack iStack;
};
#endif // __HUIMATRIXSTACK_H__