skins/AknSkins/polysrc/AknsAlPolyBase.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:14:12 +0200
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/*
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* Copyright (c) 2004-2008 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:  Base class for PolyLine and PolySpline classes.
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*
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*/
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#include "AknsAlPolyBase.h"
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#include <e32debug.h>
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// -----------------------------------------------------------------------------
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// Constructor.
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// -----------------------------------------------------------------------------
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//
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CAknsAlPolyBase::CAknsAlPolyBase()
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    {
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    iPoints = NULL; // not needed, but just in case
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    }
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// -----------------------------------------------------------------------------
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// Destructor.
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// -----------------------------------------------------------------------------
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//
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CAknsAlPolyBase::~CAknsAlPolyBase()
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    {
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    delete iPoints;
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    iPoints = NULL;
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    }
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// -----------------------------------------------------------------------------
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// Sets scaled area.
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// -----------------------------------------------------------------------------
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//
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void CAknsAlPolyBase::SetScaledArea( const TSize aAreaSize )
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    {
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    iAreaSize = aAreaSize;
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    }
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// -----------------------------------------------------------------------------
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// Sets poly points.
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// -----------------------------------------------------------------------------
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//
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void CAknsAlPolyBase::SetPolyPointsL( const TDesC16& aPointString )
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    {
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    TInt coordCount = aPointString.Length();
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    if ((coordCount & 0x1) || coordCount < 4) // odd number or too few point coordinates
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        {
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        RDebug::Printf("%s, line %d, ERROR: Illegal coordinate count", __FILE__, __LINE__);
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        User::Leave(KErrArgument);
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        }
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    iPointCount = coordCount >> 1;
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    iPoints = new (ELeave) TPolyPoint[iPointCount];
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    iPoints[0].iX = aPointString[0];
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    iPoints[0].iY = aPointString[1];
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    TUint16 oldX = iPoints[0].iX;
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    TUint16 oldY = iPoints[0].iY;
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    // parse numbers from the descriptor
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    for (TInt i = 1; i < iPointCount; i++) // first point already set
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        {
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        iPoints[i].iX = aPointString[i*2];
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        iPoints[i].iY = aPointString[i*2+1];
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        if (oldX == iPoints[i].iX && oldY == iPoints[i].iY)
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            {
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            RDebug::Printf("%s, line %d, ERROR: subsequent coordinates cannot be equal", __FILE__, __LINE__);
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            User::Leave(KErrArgument);
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            }
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        oldX = iPoints[i].iX;
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        oldY = iPoints[i].iY;
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        }
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    }
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// -----------------------------------------------------------------------------
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// Sets poly1D points.
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// -----------------------------------------------------------------------------
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//
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void CAknsAlPolyBase::SetPolyPoints1DL( const TDesC16& aPointString )
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    {
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    TInt coordCount = aPointString.Length();
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    if ((coordCount & 0x1) || coordCount < 4) // odd number or too few point coordinates
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        User::Leave(KErrArgument);
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    iPointCount = coordCount >> 1;
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    iPoints = new (ELeave) TPolyPoint[iPointCount];
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    iPoints[0].iX = aPointString[0];
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    iPoints[0].iY = aPointString[1];
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    TUint16 oldX = iPoints[0].iX;
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    // parse numbers from the descriptor
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    for (TInt i = 1; i < iPointCount; i++) // first point already set
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        {
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        iPoints[i].iX = aPointString[i*2];
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        iPoints[i].iY = aPointString[i*2+1];
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        if (iPoints[i].iX < oldX) // points must be in ascending order
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            User::Leave(KErrArgument);
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        oldX = iPoints[i].iX;
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        }
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    }
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// Some helper methods for child classes
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// -----------------------------------------------------------------------------
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// Squareroot.
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// -----------------------------------------------------------------------------
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//
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TUint CAknsAlPolyBase::Sqrt( TUint aParam )
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    {
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    TUint t,b,c=0;
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    for (b=0x40000000;b!=0;b>>=2)
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        {
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        t = c + b;
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        c >>= 1;
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        if (t <= aParam)
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            {
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            aParam -= t;
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            c += b;
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            }
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        }
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    return(c);
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    }
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// -----------------------------------------------------------------------------
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// Calculates scaled point.
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// -----------------------------------------------------------------------------
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//
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TPoint CAknsAlPolyBase::CalculateScaledPoint( const TPoint aPoint )
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    {
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    TPoint ret(0,0);
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    if (iAreaSize.iWidth == 0)
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        {
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        ret.iX = aPoint.iX;
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        }
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    else
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        {
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        ret.iX = (aPoint.iX * iAreaSize.iWidth) >> 16;
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        }
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    if (iAreaSize.iHeight == 0)
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        {
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        ret.iY = aPoint.iY;
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        }
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    else
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        {
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        ret.iY = (aPoint.iY * iAreaSize.iHeight) >> 16;
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        }
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    return ret;
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    }
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// End of file
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