cnamecol.cpp

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// $Id: cnamecol.cpp 1282 2006-06-09 09:46:49Z alex $
// $Header:
// CNamedColourReplacer class implementation
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
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----------------------------------

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-----------------

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=================================XARAHEADEREND============================
 */

#include "camtypes.h"
#include "cnamecol.h"
//#include "fillval.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "doccolor.h" - in camtypes.h [AUTOMATICALLY REMOVED]


CC_IMPLEMENT_DYNCREATE(CNamedColourReplacer, CCObject);
CC_IMPLEMENT_DYNCREATE(CHSVChanger, CNamedColourReplacer);
CC_IMPLEMENT_DYNAMIC(CTransparencyReplacer, CCObject);

const INT32 MAX_SAT_VALUE = 255;
const INT32 MAX_HUE_VALUE = 360;
const INT32 MIN_VALUE = 0;
const INT32 MAX_TRANSPARENCY = 255;

/***********************************************************************************************

>   CNamedColourReplacer::CNamedColourReplacer()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000

    Purpose:    Constructor

***********************************************************************************************/

CNamedColourReplacer::CNamedColourReplacer()
{
    m_pColourFill    = NULL;
    m_pReplaceColour = NULL;
}

/***********************************************************************************************

>   CNamedColourReplacer::CNamedColourReplacer(ColourFillAttribute* pFillAttr, DocColour* pColour)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     pFillAttr - the attribute value that we want to replace the colours in
                pColour - the colour we wish to replace them with
    Purpose:    Constructor with initialisation

***********************************************************************************************/

CNamedColourReplacer::CNamedColourReplacer(ColourFillAttribute* pFillAttr, DocColour* pColour)
{
    // call the default constructor that NULLs all the member pointers
    CNamedColourReplacer::CNamedColourReplacer();
    Initialise(pFillAttr, pColour);
}


/***********************************************************************************************

>   CNamedColourReplacer::~CNamedColourReplacer()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000

    Purpose:    Destructor

***********************************************************************************************/

CNamedColourReplacer::~CNamedColourReplacer()
{

}

/***********************************************************************************************

>   CNamedColourReplacer::Initialise(ColourFillAttribute* pFillAttr, DocColour* pColour)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     pFillAttr - the attribute value that we want to replace the colours in
                pColour - the colour we wish to replace them with
    Purpose:    initialisation function.

***********************************************************************************************/

BOOL CNamedColourReplacer::Initialise(ColourFillAttribute* pFillAttr, DocColour* pColour)
{
    if (pFillAttr == NULL || pColour == NULL)
        return FALSE;

    m_pColourFill = pFillAttr;
    m_pReplaceColour = pColour;

    return TRUE;
}


/***********************************************************************************************

>   BOOL CNamedColourReplacer::IsInitialised()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Retuns:     TRUE if our important members have been initialised, FALSE otherwise
    Purpose:    as above

***********************************************************************************************/

BOOL CNamedColourReplacer::IsInitialised()
{
    return ((m_pColourFill != NULL) && (m_pReplaceColour != NULL));
}


/***********************************************************************************************

>   BOOL CNamedColourReplacer::ReplaceColours()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    TRUE if all went well, FALSE if something went wrong
    Purpose:    This function asks the colour fill for its start colour, checks to see
                if they are named, or if they were created by a named colour. If so it copies them 
                and stores them.  It then replaces them with our replacement colour.

***********************************************************************************************/

BOOL CNamedColourReplacer::ReplaceColours()
{
//  PORTNOTETRACE("other","CNamedColourReplacer::ReplaceColours - do nothing");
//#ifndef EXCLUDE_FROM_XARALX
    if (m_pColourFill == NULL || m_pReplaceColour == NULL)
    {
        ERROR3("CNamedColourReplacer not initialised correctly");
        return FALSE;
    }

    // we only replace the start colour, so as to maintain the effect on
    // 2/3/4 colour fills
    DocColour* pOrigStartCol = m_pColourFill->GetStartColour();
    if (pOrigStartCol != NULL && pOrigStartCol->IsNamed())
    {
        // we've got one, so stash the original and replace it
        m_StartColour = *pOrigStartCol;
        m_pColourFill->SetStartColour(m_pReplaceColour);
        
    }

    return TRUE;
//#else
//  return FALSE;
//#endif
}


/***********************************************************************************************

>   BOOL CNamedColourReplacer::RestoreColours()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    TRUE if all went well, FALSE if something went wrong
    Purpose:    This function assumes that ReplaceColours has been previously called.  It uses its
                pointers to start and end colours to set colours in the attribute.

***********************************************************************************************/

BOOL CNamedColourReplacer::RestoreColours()
{
//  PORTNOTETRACE("other","CNamedColourReplacer::RestoreColours - do nothing");
//#ifndef EXCLUDE_FROM_XARALX
    if (m_pColourFill == NULL)
    {
        ERROR3("Colour fill is NULL in CNamedColourReplacer::RestoreColours");
        return FALSE;
    }

    // restore our colour
    if (m_StartColour.GetReservedFlag() == COL_NAMED)
        m_pColourFill->SetStartColour(&m_StartColour);
    

    return TRUE;
//#else
//  return FALSE;
//#endif
}


/***********************************************************************************************

>   ColourFillAttribute* CNamedColourReplacer::GetColourFill()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    pointer to the attribute that we are replacing colours in
    Purpose:    access fn.

***********************************************************************************************/

ColourFillAttribute* CNamedColourReplacer::GetColourFill()
{
    return m_pColourFill;
}



/***********************************************************************************************

>   BOOL CNamedColourReplacer::SetColourFill(ColourFillAttribute* pAttr)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     pAttr - pointer to a colour fill attribute that we wish to replace the colours in
    Returns:    TRUE, unless you pass in a duff pointer
    Purpose:    access fn.

***********************************************************************************************/

BOOL CNamedColourReplacer::SetColourFill(ColourFillAttribute* pAttr)
{
    if (pAttr == NULL)
        return FALSE;
    m_pColourFill = pAttr;
    return TRUE;
}



/***********************************************************************************************

>   DocColour* CNamedColourReplacer::GetReplacementColour()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    pointer to the the colour we are using to replace
    Purpose:    access fn.

***********************************************************************************************/

DocColour* CNamedColourReplacer::GetReplacementColour()
{
    return m_pReplaceColour;
}


/***********************************************************************************************

>   BOOL CNamedColourReplacer::SetReplacementColour(DocColour* pColour)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     pColour - the colour we wish to set in our attribute
    Returns:    TRUE, unless the colour is NULL
    Purpose:    access fn.

***********************************************************************************************/

BOOL CNamedColourReplacer::SetReplacementColour(DocColour* pColour)
{
    if (pColour == NULL)
        return FALSE;
    m_pReplaceColour = pColour;
    return TRUE;
}


/*-----------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------
------------------------------CSHVCHANGER CLASS IMPLEMENTATION-----------------------------------
------------------------------------------------------------------------------------------------*/


/***********************************************************************************************

>   CHSVChanger::CHSVChanger()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000

    Purpose:    default constructor

***********************************************************************************************/

CHSVChanger::CHSVChanger() : CNamedColourReplacer()
{
    m_HueMultiplier         = 1.0;
    m_SaturationMultiplier  = 1.0;
    m_ValueMultiplier       = 1.0;
    m_HueIncrement          = 0;
    m_SatIncrement          = 0;
}


/***********************************************************************************************

>   CHSVChanger::CHSVChanger()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000

    Purpose:    default constructor

***********************************************************************************************/

CHSVChanger::CHSVChanger(ColourFillAttribute* pFill, DocColour* pCol) : CNamedColourReplacer(pFill, pCol)
{
    m_HueMultiplier         = 1.0;
    m_SaturationMultiplier  = 1.0;
    m_ValueMultiplier       = 1.0;
    m_HueIncrement          = 0;
    m_SatIncrement          = 0;

}

/***********************************************************************************************

>   CHSVChanger::~CHSVChanger()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000

    Purpose:    destructor

***********************************************************************************************/

CHSVChanger::~CHSVChanger()
{
//  PORTNOTETRACE("other","CHSVChanger::~CHSVChanger - do nothing");
//#ifndef EXCLUDE_FROM_XARALX
    // have to do a hack here to ensure that we don't decrement the usage count on 
    // indexed colours which we never incremented in the first place
    m_OrigStartCol.HackColReplacerPreDestruct();
    m_OrigEndCol1.HackColReplacerPreDestruct();
    m_OrigEndCol2.HackColReplacerPreDestruct();
    m_OrigEndCol3.HackColReplacerPreDestruct();
//#endif
}


/***********************************************************************************************

>   virtual BOOL CHSVChanger::ReplaceColours()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    TRUE if all went well, FALSE if something went wrong
    Purpose:    This function asks the colour fill for its colours one by one, checks to see
                if they are named, or if they were created by a named colour. If so it copies them 
                and stores them.  It then replaces them with our replacement colour.

***********************************************************************************************/

BOOL CHSVChanger::ReplaceColours()
{
    // if we also want to replace colours then do that first
    if (m_pReplaceColour != NULL)
        return CNamedColourReplacer::ReplaceColours();

    return TRUE;
}


/***********************************************************************************************

>   BOOL CHSVChanger::ChangeHSVValues()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    TRUE if all went well, FALSE if something went wrong
    Purpose:    The raison d'etre of this object.  Changes the HSV values of the member fill
***********************************************************************************************/

BOOL CHSVChanger::ChangeHSVValues()
{
    if (m_pColourFill == NULL)
    {
        ERROR3("Colour fill is NULL in CHSVChanger::ChangeHSVValues");
        return FALSE;
    }
    
    // we need to ask for the colours one by one
    DocColour* pStartCol = NULL;
    if (m_pReplaceColour != NULL)
        pStartCol = m_pReplaceColour;
    else
        pStartCol = m_pColourFill->GetStartColour();
    
    if (pStartCol != NULL)
    {
        m_OrigStartCol = *pStartCol;
        ApplyIncrements(pStartCol);
        m_pColourFill->SetStartColour(pStartCol);
    }

    DocColour* pEndCol1 = m_pColourFill->GetEndColour();
    if (pEndCol1 != NULL) 
    {
        // first record our original values
        m_OrigEndCol1 = *pEndCol1;
        ApplyIncrements(pEndCol1);
    }
    
    DocColour* pEndCol2 = m_pColourFill->GetEndColour2();
    if (pEndCol2 != NULL) 
    {
        // first record our original values
        m_OrigEndCol2 = *pEndCol2;
        ApplyIncrements(pEndCol2);
    }

    DocColour* pEndCol3 = m_pColourFill->GetEndColour3();
    if (pEndCol3 != NULL)
    {
        // first record our original values
        m_OrigEndCol3 = *pEndCol3;
        ApplyIncrements(pEndCol3);
    }
    
    return TRUE;
}



/***********************************************************************************************

>   BOOL CHSVChanger::RestoreColours()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    TRUE if all went well, FALSE if something went wrong
    Purpose:    Restores the colours that were changed

***********************************************************************************************/
BOOL CHSVChanger::RestoreColours()
{
    if (m_pColourFill == NULL)
        return FALSE;

    // here we restore any named colours we replaced
    if (m_pReplaceColour != NULL)
        return CNamedColourReplacer::RestoreColours();

    // we need to ask for the colours one by one
    DocColour* pStartCol = m_pColourFill->GetStartColour();
    if (pStartCol != NULL)
    {
        *pStartCol = m_OrigStartCol;
    }

    DocColour* pEndCol1 = m_pColourFill->GetEndColour();
    if (pEndCol1 != NULL) 
    {
        *pEndCol1 = m_OrigEndCol1;

    }
    
    DocColour* pEndCol2 = m_pColourFill->GetEndColour2();
    if (pEndCol2 != NULL) 
    {
        *pEndCol2 = m_OrigEndCol2;
    }

    DocColour* pEndCol3 = m_pColourFill->GetEndColour3();
    if (pEndCol3 != NULL)
    {
        *pEndCol3 = m_OrigEndCol3;
    }
    
    return TRUE;    



}


/***********************************************************************************************

>   BOOL CHSVChanger::IsInitialised()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    true, if this object was initialised in any way
    Purpose:    
***********************************************************************************************/

BOOL CHSVChanger::IsInitialised()
{
    BOOL Init = m_pReplaceColour != NULL ||
                m_HueMultiplier != 1.0 || 
                m_SaturationMultiplier != 1.0;

    return Init;
}

/***********************************************************************************************

>   BOOL CHSVChanger::ShouldChangeHSV()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    true, if ChangeHSV should be called, FALSE otherwise
    Purpose:    does a few checks to see if it is worth changing hsv values, currently we only use
                the multipliers so it just checks to see if they are default or not
***********************************************************************************************/

BOOL CHSVChanger::ShouldChangeHSV()
{
    BOOL bShouldReplace = (m_HueIncrement != 0 || m_SatIncrement != 0);

    return bShouldReplace;
}



/***********************************************************************************************

>   void CHSVChanger::ApplyIncrements(DocColour* pCol)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     pCol - the colour to be incremented
    Returns:    -
    Purpose:    Takes a colour, extracts its HSV values, adds (or subtracts) the increment value

***********************************************************************************************/

void CHSVChanger::ApplyIncrements(DocColour* pCol)
{
//  PORTNOTETRACE("other","CHSVChanger::ApplyIncrements - do nothing");
//#ifndef EXCLUDE_FROM_XARALX
    if (pCol == NULL)
    {
        ERROR3("Colour pointer is NULL in CHSVChanger::ApplyIncrements");
        return;
    }

    INT32 Hue;
    INT32 Sat;
    INT32 Dummy;

    pCol->GetHSVValue(&Hue, &Sat, &Dummy);
    //TRACEUSER( "Diccon", _T("Original Sat = %d, "), Sat);
    //TRACEUSER( "Diccon", _T("Original Hue = %d, "), Hue);
    Hue += m_HueIncrement;
    if (Hue < 0)
        Hue += MAX_HUE_VALUE;
    else if (Hue > MAX_HUE_VALUE)
        Hue -= MAX_HUE_VALUE;

    Sat -= abs(m_SatIncrement);
        if (Sat < 0)
        Sat = 1;
    else if (Sat > MAX_SAT_VALUE)
        Sat = MAX_SAT_VALUE;
    
//  TRACEUSER( "Diccon", _T("SatIncr = %d, New Sat = %d\n"), m_SatIncrement, Sat);
//  TRACEUSER( "Diccon", _T("Hue Incr = %d, New Hue = %d\n"), m_HueIncrement, Hue);
    pCol->SetHSVValue(Hue, Sat, Dummy);
//#endif
}


/***********************************************************************************************

>   CHSVChanger::GetHueMultiplier()
    
    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Outputs:    -
    Returns:    the hue multiplier, duh
    Purpose:    Access

***********************************************************************************************/

double CHSVChanger::GetHueMultiplier()
{
    return m_HueMultiplier;
}


/***********************************************************************************************

>   BOOL CHSVChanger::SetHueMultiplier(double Mult)
    
    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     the hue multiplier, duh
    Outputs:    -
    Returns:    always TRUE at the moment
    Purpose:    Sets the Hue multiplier, also calculates the value that will be added/subtracted
                from the colour

***********************************************************************************************/

BOOL CHSVChanger::SetHueMultiplier(double Value)
{
    m_HueMultiplier = Value;
    m_HueIncrement = (INT32)Value; // * (double)MAX_HUE_VALUE);
    //TRACEUSER( "Diccon", _T("Hue Increment = %d\n"), m_HueIncrement);
    return TRUE;
}

/***********************************************************************************************

>   CHSVChanger::GetSaturationMultiplier()
    
    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Outputs:    -
    Returns:    the Saturation multiplier, duh
    Purpose:    Access

***********************************************************************************************/

double CHSVChanger::GetSaturationMultiplier()
{
    return m_SaturationMultiplier;
}


/***********************************************************************************************

>   BOOL CHSVChanger::SetSaturationMultiplier(double Value)
    
    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     the Saturation multiplier, as you might expect
    Outputs:    -
    Returns:    TRUE 
    Purpose:    Sets the saturation multiplier, also calculates the addition/subtraction value

***********************************************************************************************/

BOOL CHSVChanger::SetSaturationMultiplier(double Value)
{
    m_SaturationMultiplier = Value;

    m_SatIncrement = (INT32)(Value * (double)MAX_SAT_VALUE);
    
    //TRACEUSER( "Diccon", _T("Sat increment = %d\n"), m_SatIncrement);
    return TRUE;
}


/***********************************************************************************************

>   void CHSVChanger::ChangeColour(DocColour* pCol)
    
    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     pCol - pointer to the colour we wish to change
    Outputs:    Colour with changed values
    Returns:    -
    Purpose:    Simply changes the values in this one colour alone, in case you're fed up of 
                worrying about attributes and the like
**********************************************************************************************/

void CHSVChanger::ChangeColour(DocColour* pCol)
{
    if (pCol == NULL)
        return;
    ApplyIncrements(pCol);
}



/*----------------------------------------------------------------------------------------------
----------------------CTransparency Class implementation----------------------------------------
------------------------------------------------------------------------------------------------*/


/***********************************************************************************************

>   CTransparencyReplacer::CTransparencyReplacer()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000

    Purpose:    default constructor

***********************************************************************************************/

CTransparencyReplacer::CTransparencyReplacer()
{
    m_pTranspFill = NULL;
    m_OriginalTransp = 0;
    m_ReplaceTransp = -1;
    m_TranspAdjust  = 1.0;
    m_InvertAdjust = 1.0;
}


/***********************************************************************************************

>   BOOL CTransparencyReplacer::SetReplacementValue(INT32 Value)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     the value to use as our replacement
    Returns:    TRUE unless Value is outside the legal range
    Purpose:    access

***********************************************************************************************/

BOOL CTransparencyReplacer::SetReplacementValue(INT32 Value)
{
    if (Value > MAX_TRANSP_VALUE)
        return FALSE;

    m_ReplaceTransp = Value;
    return TRUE;
}


/***********************************************************************************************

>   INT32 CTransparencyReplacer::GetReplacementValue()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    out replacement transparency value
    Purpose:    access

***********************************************************************************************/

INT32 CTransparencyReplacer::GetReplacementValue()
{
    return m_ReplaceTransp;
}


/***********************************************************************************************

>   BOOL CTransparencyReplacer::SetAdjustmentValue(double Value)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     our adjuster value
    Returns:    TRUE unless Value is outside the legal range
    Purpose:    access

***********************************************************************************************/

BOOL CTransparencyReplacer::SetAdjustmentValue(double Value)
{
    if (Value > 3.0 || Value < 0)
        return FALSE;
    m_TranspAdjust = Value;
    
    return TRUE;
}


/***********************************************************************************************

>   BOOL CTransparencyReplacer::GetAdjustmentValue(double Value)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     
    Returns:    our adjuster value
    Purpose:    access

***********************************************************************************************/

double CTransparencyReplacer::GetAdjustmentValue()
{
    return m_TranspAdjust;
}


/***********************************************************************************************

>   BOOL CTransparencyReplacer::SetInvertedAdjuster(double Value)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     our adjuster value
    Returns:    TRUE unless Value is outside the legal range
    Purpose:    access to our inverted adjuster 

***********************************************************************************************/

BOOL CTransparencyReplacer::SetInvertedAdjuster(double Value)
{
    if (Value > 3.0 || Value < 0)
        return FALSE;
    m_InvertAdjust = Value;
    
    return TRUE;
}


/***********************************************************************************************

>   BOOL CTransparencyReplacer::GetAdjustmentValue1(double Value)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     
    Returns:    our inverted adjuster value
    Purpose:    access

***********************************************************************************************/

double CTransparencyReplacer::GetInvertedAdjuster()
{
    return m_InvertAdjust;
}



/***********************************************************************************************

>   void CTransparencyReplacer::SetTransparencyAttr(TranspFillAttribute* pAttrVal)

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     pAttrVal - the transparency attribute value that we are working on
    Returns:    -
    Purpose:    access

***********************************************************************************************/

void CTransparencyReplacer::SetTransparencyAttr(TranspFillAttribute* pAttrVal)
{
    m_pTranspFill = pAttrVal;
}


/***********************************************************************************************

>   BOOL CTransparencyReplacer::ReplaceTransparency()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    -
    Purpose:    Does the deed of replacing the transparency value in our attribute with the one
                we have been given

***********************************************************************************************/

BOOL CTransparencyReplacer::ReplaceTransparency()
{
    if (m_pTranspFill == NULL)
        return FALSE;

    // first cache the original value
    m_OriginalTransp = *m_pTranspFill->GetStartTransp();
    
    // recall that a negative replacement value means don't replace
    if (m_ReplaceTransp >= 0)
        m_pTranspFill->Transp = (UINT32)m_ReplaceTransp;

    if (m_TranspAdjust >= 0)
    {
        /* Ok, so what is going on here?  Basically this:
        - We have two adjusters, they both generate a value which is a proportion of the maximum transparency
        - One of the adjusters is inverted (i.e. as its value increases, its output value decreases 
        - Both adjusters make sure they are within legal limits 
        - The adjuster value is added to the original value
        - We take a straight mean of the two adjusted values and set it back to the attribute
        */

        double TranspAdj = m_TranspAdjust * MAX_TRANSPARENCY;
        double TranspAdj1 = m_InvertAdjust * MAX_TRANSPARENCY;

        INT32 Adjust = INT32(TranspAdj); 
        Adjust -= MAX_TRANSPARENCY;

        INT32 InvertAdjust = INT32(MAX_TRANSPARENCY- TranspAdj1);
        
        INT32 FirstTransp = m_pTranspFill->Transp + Adjust;
        
        INT32 FinalTransp = FirstTransp + InvertAdjust;

        if (FinalTransp > MAX_TRANSPARENCY)
            FinalTransp = MAX_TRANSPARENCY;
        if (FinalTransp < 0)
            FinalTransp = 0;
    //  TRACEUSER( "Diccon", _T("New Transp = %d\n"), FinalTransp);
        m_pTranspFill->Transp = UINT32(FinalTransp); 
    }

    return TRUE;
}


/***********************************************************************************************

>   BOOL CTransparencyReplacer::RestoreTransparency()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    -
    Purpose:    Does the deed of replacing the transparency value in our attribute with the one
                we have been given

***********************************************************************************************/

BOOL CTransparencyReplacer::RestoreTransparency()
{
    if (m_pTranspFill == NULL)
        return FALSE;

    m_pTranspFill->Transp = m_OriginalTransp;

    return TRUE;
}


/***********************************************************************************************

>   BOOL CTransparencyReplacer::IsInitialised()

    Author:     Diccon_Yamanaka (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/4/2000
    Inputs:     -
    Returns:    True if the replacer has been initialised and is ready to replace, false otherwise
    Purpose:    as above
***********************************************************************************************/

BOOL CTransparencyReplacer::IsInitialised()
{
    return (m_pTranspFill != NULL && (m_ReplaceTransp >= 0 || m_TranspAdjust >= 0));
}

---