ppbevel.cpp

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// $Id: ppbevel.cpp 1282 2006-06-09 09:46:49Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
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----------------------------------

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

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=================================XARAHEADEREND============================
 */
// ppbevel - Definition of bevel BevelPathProcessor class

#include "camtypes.h"

#include "ppbevel.h"

//#include "paths.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "rndrgn.h" - in camtypes.h [AUTOMATICALLY REMOVED]
#include "pathtrap.h"
#include "bevtrap.h"
//#include "view.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "docview.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "fillval.h" - in camtypes.h [AUTOMATICALLY REMOVED]
#include "gclips.h"
//#include "attrmgr.h" - in camtypes.h [AUTOMATICALLY REMOVED]
#include "attrbev.h"

CC_IMPLEMENT_DYNAMIC(BevelPathProcessor, PathProcessor);
CC_IMPLEMENT_DYNAMIC(BevelAttributePathProcessor, PathProcessor);

// Declare smart memory handling in Debug builds
#define new CAM_DEBUG_NEW

// Clipping & flattening consts
const MILLIPOINT BevelPathProcessor_Flatness = 200;
const MILLIPOINT BevelPathProcessor_Tolerance = 50;

#define SHRINKSCALE 0.5

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

>   BevelPathProcessor::BevelPathProcessor()


    Author:     David_McClarnon (Xara Group Ltd) <camelotdev@xara.com> Mc
    Created:    12/11/98

    Purpose:    Constructor

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

INT32 num = 0;

BevelPathProcessor::BevelPathProcessor(BOOL bShrinkPath)
{
    m_bShrinkPath = bShrinkPath;
    m_bIsPathClosed = TRUE;
}

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

>   virtual BevelPathProcessor::~BevelPathProcessor()

    Author:     David_McClarnon (Xara Group Ltd) <camelotdev@xara.com> Mc
    Created:    12/11/98

    Purpose:    Destructor
    
    Errors:     If this object still has a non-NULL Next pointer, it will ERROR3 in
                an effort to get you to clean up properly before destruction.

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

BevelPathProcessor::~BevelPathProcessor()
{
}

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

>   void BevelPathProcessor::ProcessPath(Path *pPath,
                                         RenderRegion *pRender,
                                         PathShape ShapePath = PATHSHAPE_PATH)

    Author:     David_McClarnon (Xara Group Ltd) <camelotdev@xara.com> Mc
    Created:    12/11/98

    Purpose:    Adds the given path to the path in me for a bevel node to use

********************************************************************************************/
void BevelPathProcessor::ProcessPath(Path *pPath,
                                     RenderRegion *pRender,
                                     PathShape ShapePath)
{
    PORTNOTETRACE("other","BevelPathProcessor::PreOpProcessing - do nothing");
#ifndef EXCLUDE_FROM_XARALX
    pRender->SaveContext();

    BOOL bPathIsClosed = pPath->IsClosed();

    if (m_bIsPathClosed && !bPathIsClosed)
    {
        m_bIsPathClosed = FALSE;
    }

    Path ShrunkPath;
    ShrunkPath.Initialise();

    // get the line width from the render region
    StrokeColourAttribute * pStrokeColour = (StrokeColourAttribute *)pRender->GetCurrentAttribute(ATTR_STROKECOLOUR);

    BOOL bShrinkPath = m_bShrinkPath;
    
    if (pStrokeColour)
    {
        if (pStrokeColour->GetStartColour())
        {
            if (!(pStrokeColour->GetStartColour()->IsTransparent()))
            {
                bShrinkPath = FALSE;
            }
        }
    }

    if (bShrinkPath && bPathIsClosed)
    {
        // flatten the path first
        ProcessFlatten Flatten(200);

        Path FlatPath;
        FlatPath.Initialise();

        ProcessFlags pf(TRUE, FALSE, FALSE);
        Flatten.FlattenPath(pf, pPath, &FlatPath);

        // ensure that the path is correct
        Path ClippedPath;
        ClippedPath.Initialise();

        Path CopyPath;
        CopyPath.Initialise();
        CopyPath.CloneFrom(FlatPath);

        FlatPath.ClipPathToPath(CopyPath, &ClippedPath, 3, 50, 200, 200);

        BevelHelpers::ShrinkPath(&ClippedPath, pRender->GetScaledPixelWidth(),
            pRender->GetScaledPixelWidth(), &ShrunkPath);

        pRender->DrawPath(&ShrunkPath, this, ShapePath);
    }
    else
    {
        pRender->DrawPath(pPath, this, ShapePath);
    }

    pRender->RestoreContext();
#endif
}

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

>   static void BevelPathProcessor::ShrinkPath(Path * pSrcPath, 
                                    double amountX,
                                    double amountY, 
                                    Path * pRetnPath)


    Author:     David_McClarnon (Xara Group Ltd) <camelotdev@xara.com>
    Created:    29/10/98
    Purpose:    Shrinks the path very slightly so that antialiasing doesn't bleed out
                of the bevel
    SeeAlso:    -

********************************************************************************************/
void BevelHelpers::ShrinkPath(Path * pSrcPath, double amountX, double amountY, 
                                    Path * pRetnPath, BOOL bTest)
{
    if (!pSrcPath || !pRetnPath)
        return;

    if (pSrcPath->GetNumCoords() < 3)
    {
        pRetnPath->CloneFrom(*pSrcPath);
        return;
    }
    
    if (amountX == 0 || amountY == 0)
        return;

    pRetnPath->ClearPath();
    pRetnPath->CloneFrom(*pSrcPath);

    DocCoord dcBefore;
    DocCoord dcThis;
    DocCoord dcAfter;
    DocCoord dcTest;

    DocRect testRect;
    DocRect thisRect;

    NormCoord ncBefore;
    NormCoord ncAfter;
    NormCoord ncAverage;

    double dt = 0;
//  double dot = 0;

    INT32 IStart = 0;
    INT32 IEnd = 0;

    double BeforeLen = 0;
    double AfterLen  = 0;
    double LenAverage = 0;

    BOOL bOK = FALSE;

    // first, calculate the normal list
    NormCoord *pNormList = new NormCoord[pSrcPath->GetNumCoords()];
    
    for (INT32 i = 0 ; i < pSrcPath->GetNumCoords(); i++)
    {
        // get the points before & after
        IStart = i - 1;
        IEnd = i + 1;
        
        if (i == pSrcPath->GetNumCoords() - 1)
        {
            IEnd = i;
            pSrcPath->FindStartOfSubPath(&IEnd);
            IEnd ++;
        }
        else if (pSrcPath->GetVerbArray()[i] == PT_MOVETO)
        {
            // find the end of the sub-path
            IStart = i;
            pSrcPath->FindEndElOfSubPath(&IStart);
            IStart -= 1;
        }
        else if (pSrcPath->GetVerbArray()[i+1] == PT_MOVETO)
        {
            IEnd = i;
            pSrcPath->FindStartOfSubPath(&IEnd);
            IEnd ++;
        }
        
        dcBefore = pSrcPath->GetCoordArray()[IStart];
        dcThis = pSrcPath->GetCoordArray()[i];
        dcAfter = pSrcPath->GetCoordArray()[IEnd];

        ncBefore.x = dcThis.x - dcBefore.x;
        ncBefore.y = dcThis.y - dcBefore.y;
        BeforeLen = 1/ncBefore.GetLength();

        if (BeforeLen > 0)
        {
            ncBefore.x *= BeforeLen;
            ncBefore.y *= BeforeLen;
        }

        ncAfter.x = dcAfter.x - dcThis.x;
        ncAfter.y = dcAfter.y - dcThis.y;
        AfterLen = 1/ncAfter.GetLength();

        if (AfterLen > 0)
        {
            ncAfter.x *= AfterLen;
            ncAfter.y *= AfterLen;
        }
        
        ncAverage.x = ncBefore.x + ncAfter.x;
        ncAverage.y = ncBefore.y + ncAfter.y;
        
        LenAverage = 1/ncAverage.GetLength();

        // do the normal
        if (LenAverage > 0)
        {
            ncAverage.x *= LenAverage;
            ncAverage.y *= LenAverage;
        
            // rotate by 90 degrees
            dt = ncAverage.x;
            ncAverage.x = -ncAverage.y;
            ncAverage.y = dt;

            pNormList[i] = ncAverage;
        }
    }                      

    INT32 AbsAmountX = abs((INT32)(amountX));
    INT32 AbsAmountY = abs((INT32)(amountY));
    INT32 NextIndex = 0;

    DocCoord intersection;
    double p = 0;
    double q = 0;
    
    BOOL bDoTest = FALSE;

    // now, run through the list again calculating bounding rects
    for (INT32 i = 0 ; i < pSrcPath->GetNumCoords(); i++)
    {
        dcThis = pSrcPath->GetCoordArray()[i];
        
        // only do this on single sub-paths (quicker !)
        /*
        if (pSrcPath->GetVerbArray()[i] == PT_MOVETO)
        {
            IStart = i;
            IEnd = i;
            pSrcPath->FindEndElOfSubPath(&IEnd);
        }
        */

        IStart = 0;
        IEnd = pSrcPath->GetNumCoords();
        
        // is sub path in list ?
        bOK = TRUE;

        IStart = 0;
        IEnd = pSrcPath->GetNumCoords();

        thisRect.lo.x = dcThis.x - AbsAmountX;
        thisRect.lo.y = dcThis.y - AbsAmountY;
        thisRect.hi.x = dcThis.x + AbsAmountX;
        thisRect.hi.y = dcThis.y + AbsAmountY;
        
        for (INT32 j = IStart; j <= IEnd && bOK; j++)
        {
            // get the line segment to test         
            dcTest = pSrcPath->GetCoordArray()[j];
            
            bDoTest = TRUE;

            if (i == IStart)
            {
                if (j == IEnd || j == i || j == i+1)
                {
                    bDoTest = FALSE;
                }
            }
            else if (i == IEnd)
            {
                if (j == IEnd - 1 || j == i || j == IStart)
                {
                    bDoTest = FALSE;
                }
            }
            else if (j == i - 1 || j == i || j == i+1)
            {
                bDoTest = FALSE;
            }
            
            if (bDoTest)
            {
                NextIndex = j + 1;
                
                if (NextIndex == IEnd)
                {
                    NextIndex = IStart;
                }
                
                dcAfter = pSrcPath->GetCoordArray()[NextIndex];
                
                // do the bounding rect
                if (dcTest.x < dcAfter.x)
                {
                    testRect.lo.x = dcTest.x;
                    testRect.hi.x = dcAfter.x;
                }
                else
                {
                    testRect.lo.x = dcAfter.x;
                    testRect.hi.x = dcTest.x;
                }
                
                if (dcTest.y < dcAfter.y)
                {
                    testRect.lo.y = dcTest.y;
                    testRect.hi.y = dcAfter.y;
                }
                else
                {
                    testRect.lo.y = dcAfter.y;
                    testRect.hi.y = dcTest.y;
                }
                
                if (testRect.IsIntersectedWith(thisRect))
                {
                    // check if when we move the point the point changes sides from
                    // one side of the line segment to the other
                    ncAverage.x = dcTest.x - dcAfter.x;
                    ncAverage.y = dcTest.y - dcAfter.y;
                    
                    if (CCreateBevelTrapezoids::CalculateIntersection(&dcThis, &(pNormList[i]),
                        &dcAfter, &ncAverage, 
                        &intersection, &p, &q))
                    {
                        if (intersection.x > testRect.lo.x && intersection.x < testRect.hi.x &&
                            intersection.y > testRect.lo.y && intersection.y < testRect.hi.y)
                        {
                            // get the length of the line
                            ncAverage.x = dcThis.x - intersection.x;
                            ncAverage.y = dcThis.y - intersection.y;

                            q = ncAverage.GetLength();

                            if (q > 0)
                            {
                                if (q < fabs(amountX*2))
                                {
                                    bOK = FALSE;
                                }
                            }

                        }
                    }
                }           
            }
        }

        if (bOK)
        {
            dcThis.x = (INT32)((((double)dcThis.x) - (pNormList[i].x * amountX)));
            dcThis.y = (INT32)((((double)dcThis.y) - (pNormList[i].y * amountY)));
                    
            pRetnPath->GetCoordArray()[i] = dcThis;
        }       
    }

    delete [] pNormList;
    pNormList = NULL;

    /*
    Path StrokedPath;
    StrokedPath.Initialise();

    pSrcPath->StrokePathToPath((INT32)(amountX*2),
                              LineCapButt,
                              MitreJoin,
                              NULL,
                              &StrokedPath,
                              BEVEL_FLATNESS/5,
                              TRUE);
    
    // need to flatten this
    ProcessFlatten Flatten(BEVEL_FLATNESS/5);

    Path FlatPath;
    FlatPath.Initialise();

    pRetnPath->ClearPath(FALSE);
    pRetnPath->Initialise();
    
    ProcessFlags pf(TRUE, FALSE, FALSE);
    Flatten.FlattenPath(pf, &StrokedPath, &FlatPath);

    if (!bAdd)
    {
        FlatPath.ClipPathToPath(pSrcPath, 
            pRetnPath,
            1 | CLIPPING_SOURCE_WINDING,
            0, BEVEL_FLATNESS/5, BEVEL_FLATNESS/5);
    }
    else
    {
        FlatPath.ClipPathToPath(pSrcPath, 
            pRetnPath,
            7 | CLIPPING_SOURCE_WINDING,
            0, BEVEL_FLATNESS/5, BEVEL_FLATNESS/5);
    }
    */


    pRetnPath->IsFilled = TRUE;
    pRetnPath->IsStroked = FALSE;

}

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

>   static BOOL BevelHelpers::IsPathToBeReversed(Path * pPath)

    Author:     David_McClarnon (Xara Group Ltd) <camelotdev@xara.com>
    Created:    29/10/98
    Purpose:    Indicates that the path is around the wrong way for bevelling i.e.
                the normals will be facing outwards, not inwards
    Notes:      The path must have no sub-paths
    SeeAlso:    -

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

BOOL BevelHelpers::IsPathToBeReversed(Path * pPath)
{
    NormCoord ncBefore;
    NormCoord ncAfter;
    NormCoord ncBefore90;

    double TotalDot = 0;
    double dot1 = 0;
    double dot2 = 0;

    DocRect Bounds = pPath->GetBoundingRect();
    DocCoord Centre ;
    Centre.x = Bounds.lo.x + (Bounds.Width() / 2);
    Centre.y = Bounds.lo.y + (Bounds.Height() / 2);

    UINT32 Count = 0;
    
    for (INT32 i = 0; i < pPath->GetNumCoords()-1; i++)
    {
        if (i > 0 && pPath->GetVerbArray()[i] == PT_MOVETO)
            break;

        Count ++;
        
        // get the points before & after
        ncBefore.x = pPath->GetCoordArray()[i].x - Centre.x;
        ncBefore.y = pPath->GetCoordArray()[i].y - Centre.y;
        
        ncAfter.x = pPath->GetCoordArray()[i+1].x - Centre.x;
        ncAfter.y = pPath->GetCoordArray()[i+1].y - Centre.y;

        ncBefore.Normalise();
        ncAfter.Normalise();

        ncBefore90.y = -ncBefore.x;
        ncBefore90.x =  ncBefore.y;

        dot1 = ncBefore90.x * ncAfter.x + ncBefore90.y * ncAfter.y;
        dot2 = ncBefore.x * ncAfter.x + ncBefore.y * ncAfter.y;

        TotalDot += dot1;
    }

    TotalDot /= (double)Count;

    TRACEUSER( "DavidM", _T("Total %f\n"), TotalDot);

    return (TotalDot < -0.05);
}

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

>   void BevelHelpers::EliminateMultiplePoints(Path * pPath)

    Author:     David_McClarnon (Xara Group Ltd) <camelotdev@xara.com>
    Created:    20/1/99
    Purpose:    Eliminates multiple points in the path
                Path must be flat !
    SeeAlso:    -

********************************************************************************************/
void BevelHelpers::EliminateMultiplePoints(Path * pPath)
{   
    Path NewPath;
    NewPath.Initialise();

    // flatten the path
    pPath->Flatten(200, &NewPath);
    pPath->CloneFrom(NewPath);
    pPath->IsFilled = TRUE;
    pPath->IsStroked = FALSE;

    NewPath.ClearPath();
    NewPath.IsFilled = TRUE;
    NewPath.IsStroked = FALSE;

    DocCoord dc1(0,0);
    DocCoord dc2;

    INT32 StartIndex = 0;

    for (INT32 i = 0 ; i < pPath->GetNumCoords(); i++)
    {
        dc2 = pPath->GetCoordArray()[i];

        // ensure that dc1 is different to dc2 on first index
        if (i == 0)
        {
            dc1.x = dc2.x - 1000;
        }
        
        if (dc2.x != dc1.x ||
            dc2.y != dc1.y ||
            pPath->GetVerbArray()[i] == PT_MOVETO)
        {
            if (pPath->GetVerbArray()[i] == PT_MOVETO)
            {
                /*
                if (i > 0)
                {
                    // make sure we close the path
                    if (NewPath.GetCoordArray()[i - 1].x != NewPath.GetCoordArray()[StartIndex].x ||
                        NewPath.GetCoordArray()[i - 1].y != NewPath.GetCoordArray()[StartIndex].y)
                    {
                        NewPath.AddLineTo(NewPath.GetCoordArray()[StartIndex]);
                    }
                }
                */

                NewPath.AddMoveTo(dc2);
                StartIndex = i;
            }
            else
            {
                NewPath.AddLineTo(dc2);
            }
        }

        dc1 = dc2;
    }

    // make sure we close the path
    /*
    if (NewPath.GetCoordArray()[i - 1].x != NewPath.GetCoordArray()[StartIndex].x ||
        NewPath.GetCoordArray()[i - 1].y != NewPath.GetCoordArray()[StartIndex].y)
    {
        NewPath.AddLineTo(NewPath.GetCoordArray()[StartIndex]);
    }
    */

    pPath->ClearPath();
    pPath->CloneFrom(NewPath);
}



// BevelAttributePathProcessor implementation
/********************************************************************************************

>   BevelAttributePathProcessor::BevelAttributePathProcessor()

    Author:     David_McClarnon (Xara Group Ltd) <camelotdev@xara.com> Mc
    Created:    12/11/98

    Purpose:    Constructor

********************************************************************************************/
BevelAttributePathProcessor::BevelAttributePathProcessor()
{
    m_SummedPath.Initialise();
    m_StrokedPath.Initialise();
    m_Indent = 0;
}


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

>   BevelAttributePathProcessor::~BevelAttributePathProcessor()

    Author:     David_McClarnon (Xara Group Ltd) <camelotdev@xara.com> Mc
    Created:    12/11/98

    Purpose:    Destructor

********************************************************************************************/
BevelAttributePathProcessor::~BevelAttributePathProcessor()
{

}


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

>   void BevelAttributePathProcessor::ProcessPath(Path *pPath,
                                                  RenderRegion *pRender,
                                                  PathShape ShapePath = PATHSHAPE_PATH)

    Author:     David_McClarnon (Xara Group Ltd) <camelotdev@xara.com> Mc
    Created:    12/11/98

    Purpose:    Adds the given path to the path in me for a bevel node to use

********************************************************************************************/
void BevelAttributePathProcessor::ProcessPath(Path *pPath,
                                              RenderRegion *pRender,
                                              PathShape ShapePath)
{
//  PORTNOTETRACE("other","BevelAttributePathProcessor::PreOpProcessing - do nothing");
//#ifndef EXCLUDE_FROM_XARALX
    // pRender->DrawPath(pPath, this);

    // clip the path to itself
    Path BlankPath;
    BlankPath.Initialise();

    Path SafePath;
    SafePath.Initialise();

    pPath->ClipPathToPath(BlankPath, &SafePath, 6, BevelPathProcessor_Tolerance, 
        BevelPathProcessor_Flatness,
        BevelPathProcessor_Flatness);

    // now, sum the path
    m_SummedPath.MergeTwoPaths(SafePath);

    Path StrokedPath;
    StrokedPath.Initialise();

    SafePath.StrokePathToPath(abs(m_Indent)*2,
                            LineCapButt,
                            RoundJoin,
                            NULL,
                            &StrokedPath,
                            BevelPathProcessor_Flatness,
                            FALSE);

    // now, clip this path against the original (i.e. the passed in) path to
    // produce the final clipped path
    Path ClippedPath;
    ClippedPath.Initialise();

    // shrink the clipped path
    Path ShrunkPath;
    ShrunkPath.Initialise();

    if (m_Indent < 0)
    {
        pPath->ClipPathToPath(StrokedPath, &ClippedPath, 7 | CLIPPING_SOURCE_WINDING,
            BevelPathProcessor_Tolerance, BevelPathProcessor_Flatness,
            BevelPathProcessor_Flatness);

        BevelHelpers::ShrinkPath(&ClippedPath, pRender->GetScaledPixelWidth(), pRender->GetScaledPixelWidth(),
                            &ShrunkPath, FALSE);

        ClippedPath.CloneFrom(ShrunkPath);

        // merge the original path (reversed) into this path to produce a hole for 
        // outer bevels
        Path ReversedPath;
        ReversedPath.Initialise();
        ReversedPath.CloneFrom(SafePath);
        ReversedPath.Reverse();
        ClippedPath.MergeTwoPaths(ReversedPath);
    }
    else
    {
        pPath->ClipPathToPath(StrokedPath, &ClippedPath, 2 | CLIPPING_SOURCE_WINDING,
            BevelPathProcessor_Tolerance, BevelPathProcessor_Flatness,
            BevelPathProcessor_Flatness);

        BevelHelpers::ShrinkPath(&ClippedPath, pRender->GetScaledPixelWidth(), pRender->GetScaledPixelWidth(),
                            &ShrunkPath, FALSE);

        ClippedPath.CloneFrom(ShrunkPath);      
    }

    // merge this path with the stroked path member variable - as the attribute needs
    // it too
    m_StrokedPath.MergeTwoPaths(ClippedPath);

    // render the path with the same parameters
    ClippedPath.IsFilled = TRUE;
    ClippedPath.IsStroked = FALSE;

    pRender->SaveContext();
    pRender->SetLineColour(COLOUR_NONE);

    pRender->DrawPath(&ClippedPath, this, ShapePath);
    pRender->RestoreContext();
//#endif
}

---