// Copyright (c) 2007-2009 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:

//

#include "swdirectgdiengine.h"

#include "swdirectgdiellipse.h"

/**

A utility class to efficiently draw arcs.

@see CSwDirectGdiEngine::PieArcOutline

@internalComponent

*/

class TSwDirectGdiArc : public TSwDirectGdiEllipse

	{

public:

	void Construct(const TRect& aRect,const TPoint& aStart,const TPoint& aEnd);

	TBool SingleStep(TPoint& aTl,TBool& aDoTl,TPoint& aTr,TBool& aDoTr,TPoint& aBl,TBool& aDoBl,TPoint& aBr,TBool& aDoBr);

	void Step(TPoint& aTl,TBool& aDoTl,TPoint& aTr,TBool& aDoTr,TPoint& aBl,TBool& aDoBl,TPoint& aBr,TBool& aDoBr);

public:

	TPoint iStart;

	TPoint iEnd;

private:

	TBool iTlquad;

	TBool iTrquad;

	TBool iBlquad;

	TBool iBrquad;

	TBool iStartquadenabled;

	TBool iEndquadenabled;

	TBool iStartquaddone;

	TBool iEndquaddone;

	TInt iStartquad;

	TInt iEndquad;

	TBool iSlice;

	};

/**

Constructs a TSwDirectGdiArc. 

@param aRect   The bounding rectangle. 

@param aStart  The arc start point.

@param aEnd	   The arc end point.

@see CSwDirectGdiEngine::PieArcOutline

*/

void TSwDirectGdiArc::Construct(const TRect& aRect,const TPoint& aStart,const TPoint& aEnd)

	{

	iStart=Intersection(aRect,aStart);

	iEnd=Intersection(aRect,aEnd);

	TSwDirectGdiEllipse::Construct(aRect);

	iTlquad=EFalse;

	iTrquad=EFalse;

	iBlquad=EFalse;

	iBrquad=EFalse;

	iStartquadenabled=EFalse;

	iEndquadenabled=EFalse;

	iSlice=EFalse;

	iStartquad=0;

	iEndquad=0;

	TPoint center=aRect.Center();

	if (iStart.iX>=center.iX) iStartquad=1;

	if (iStart.iY>=center.iY) iStartquad+=2;

	if (iEnd.iX>=center.iX) iEndquad=1;

	if (iEnd.iY>=center.iY) iEndquad+=2;

	if (iStartquad!=iEndquad)

		{

		if (iStartquad==0 && iEndquad==1)

			{

			iBlquad=ETrue;

			iBrquad=ETrue;

			}

		else if (iStartquad==0 && iEndquad==3)

			iBlquad=ETrue;

		else if (iStartquad==1 && iEndquad==2)

			iTlquad=ETrue;

		else if (iStartquad==1 && iEndquad==3)

			{

			iTlquad=ETrue;

			iBlquad=ETrue;

			}

		else if (iStartquad==2 && iEndquad==0)

			{

			iTrquad=ETrue;

			iBrquad=ETrue;

			}

		else if (iStartquad==2 && iEndquad==1)

			iBrquad=ETrue;

		else if (iStartquad==3 && iEndquad==0)

			iTrquad=ETrue;

		else if (iStartquad==3 && iEndquad==2)

			{

			iTlquad=ETrue;

			iTrquad=ETrue;

			}

		}

	else if (iStart==iEnd)

		{

		iTlquad=ETrue;

		iTrquad=ETrue;

		iBlquad=ETrue;

		iBrquad=ETrue;

		}

	else

		{

		iSlice=ETrue;

		if (iStartquad==0 && (iStart.iX<iEnd.iX || iStart.iY>iEnd.iY))

			{

			iTrquad=ETrue;

			iBlquad=ETrue;

			iBrquad=ETrue;

			iSlice=EFalse;

			}

		else if (iStartquad==1 && (iStart.iX<iEnd.iX || iStart.iY<iEnd.iY))

			{

			iTlquad=ETrue;

			iBlquad=ETrue;

			iBrquad=ETrue;

			iSlice=EFalse;

			}

		else if (iStartquad==2 && (iStart.iX>iEnd.iX || iStart.iY>iEnd.iY))

			{

			iTlquad=ETrue;

			iTrquad=ETrue;

			iBrquad=ETrue;

			iSlice=EFalse;

			}

		else if (iStartquad==3 && (iStart.iX>iEnd.iX || iStart.iY<iEnd.iY))

			{

			iTlquad=ETrue;

			iTrquad=ETrue;

			iBlquad=ETrue;

			iSlice=EFalse;

			}

		}

	if (iStartquad==1 || iStartquad==2)

		iStartquadenabled=ETrue;

	if (iEndquad==0 || iEndquad==3)

		iEndquadenabled=ETrue;

	iStartquaddone=EFalse;

	iEndquaddone=EFalse;

	}

/**

Produces the next stage creating an arc, taking four points (the corners of 

the rectangle the arc should fill) as parameters.

@param aTopLeft Top left corner of rectangle.

@param aDoTl Span the top left quadrant.

@param aTopRight Top right corner of rectangle.

@param aDoTr Span the top right quadrant.

@param aBottomLeft Bottom left corner of rectangle.

@param aDoBl Span the bottom left quadrant.

@param aBottomRight Bottom right corner of rectangle.

@param aDoBr Span the bottom right quadrant.

@return TBool ETrue if step completed successfully.

@see TSwDirectGdiEllipse::SingleStep

*/

TBool TSwDirectGdiArc::SingleStep(TPoint& aTopLeft,TBool& aDoTl,TPoint& aTopRight,

					   TBool& aDoTr,TPoint& aBottomLeft,TBool& aDoBl,

					   TPoint& aBottomRight,TBool& aDoBr)

	{

	TBool finished=TSwDirectGdiEllipse::SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight);

	Step(aTopLeft,aDoTl,aTopRight,aDoTr,aBottomLeft,aDoBl,aBottomRight,aDoBr);

	return finished;

	}

/**

Determines how many quadrants are left to draw.

@param aTopLeft Top left corner of rectangle.

@param aDoTl Span the top left quadrant.

@param aTopRight Top right corner of rectangle.

@param aDoTr Span the top right quadrant.

@param aBottomLeft Bottom left corner of rectangle.

@param aDoBl Span the bottom left quadrant.

@param aBottomRight Bottom right corner of rectangle.

@param aDoBr Span the bottom right quadrant.

@see TSwDirectGdiArc::SingleStep

@see TSwDirectGdiArc::Construct

*/

void TSwDirectGdiArc::Step(TPoint& aTopLeft,TBool& aDoTl,TPoint& aTopRight,TBool& aDoTr,

				TPoint& aBottomLeft,TBool& aDoBl,TPoint& aBottomRight,TBool& aDoBr)

	{

	aDoTl=iTlquad;

	aDoTr=iTrquad;

	aDoBl=iBlquad;

	aDoBr=iBrquad;

	if (!iStartquaddone)

		{

		if (!iStartquadenabled)

			{

			if (iStartquad==0 && aTopLeft.iX<=iStart.iX && aTopLeft.iY>=iStart.iY)

				{

				iStartquadenabled=ETrue;

				iStartquaddone=ETrue;

				}

			if (iStartquad==3 && aBottomRight.iX>=iStart.iX && aBottomRight.iY<=iStart.iY)

				{

				iStartquadenabled=ETrue;

				iStartquaddone=ETrue;

				}

			}

		else

			{

			if (iStartquad==1 && (aTopRight.iX>iStart.iX || aTopRight.iY>iStart.iY))

				{

				iStartquadenabled=EFalse;

				iStartquaddone=ETrue;

				}

			if (iStartquad==2 && (aBottomLeft.iX<iStart.iX || aBottomLeft.iY<iStart.iY))

				{

				iStartquadenabled=EFalse;

				iStartquaddone=ETrue;

				}

			}

		}

	if (!iEndquaddone)

		{

		if (iEndquadenabled)

			{

			if (iEndquad==0 && (aTopLeft.iX<iEnd.iX || aTopLeft.iY>iEnd.iY))

				{

				iEndquadenabled=EFalse;

				iEndquaddone=ETrue;

				}

			if (iEndquad==3 && (aBottomRight.iX>iEnd.iX || aBottomRight.iY<iEnd.iY))

				{

				iEndquadenabled=EFalse;

				iEndquaddone=ETrue;

				}

			}

		else

			{

			if (iEndquad==1 && aTopRight.iX>=iEnd.iX && aTopRight.iY>=iEnd.iY)

				{

				iEndquadenabled=ETrue;

				iEndquaddone=ETrue;

				}

			if (iEndquad==2 && aBottomLeft.iX<=iEnd.iX && aBottomLeft.iY<=iEnd.iY)

				{

				iEndquadenabled=ETrue;

				iEndquaddone=ETrue;

				}

			}

		}

	if (iStartquad!=iEndquad)

		{

		if (iStartquadenabled)

			{

			if (iStartquad==0) aDoTl=ETrue;

			else if (iStartquad==1) aDoTr=ETrue;

			else if (iStartquad==2) aDoBl=ETrue;

			else if (iStartquad==3) aDoBr=ETrue;

			}

		if (iEndquadenabled)

			{

			if (iEndquad==0) aDoTl=ETrue;

			else if (iEndquad==1) aDoTr=ETrue;

			else if (iEndquad==2) aDoBl=ETrue;

			else if (iEndquad==3) aDoBr=ETrue;

			}

		}

	else

		{

		if (iSlice)

			{

			if (iStartquadenabled && iEndquadenabled)

				{

				if (iStartquad==0) aDoTl=ETrue;

				else if (iStartquad==1) aDoTr=ETrue;

				else if (iStartquad==2) aDoBl=ETrue;

				else if (iStartquad==3) aDoBr=ETrue;

				}

			}

		else

			{

			if (iStartquadenabled || iEndquadenabled)

				{

				if (iStartquad==0) aDoTl=ETrue;

				else if (iStartquad==1) aDoTr=ETrue;

				else if (iStartquad==2) aDoBl=ETrue;

				else if (iStartquad==3) aDoBr=ETrue;

				}

			}

		}

	if (aTopLeft.iX==aTopRight.iX)

		{

		if (aDoTl && aDoTr) aDoTr=EFalse;

		if (aDoBl && aDoBr) aDoBr=EFalse;

		}

	}

//

// Pie and Arc drawing functions

//

/**

@see MDirectGdiEngine::DrawArc()

*/

void CSwDirectGdiEngine::DrawArc(const TRect& aRect,const TPoint& aStart,

								 const TPoint& aEnd)

	{

	TRect rcpy(aRect);

	rcpy.Move(iOrigin);

	TruncateRect(rcpy);

	TRect targetRect(rcpy);

	targetRect.Grow((iPenSize.iWidth>>1)+1,(iPenSize.iHeight>>1)+1);

	PieArcOutline(rcpy,aStart+iOrigin,aEnd+iOrigin,EFalse);

	}

/**

@see MDirectGdiEngine::DrawPie()

*/

void CSwDirectGdiEngine::DrawPie(const TRect& aRect,const TPoint& aStart,

								 const TPoint& aEnd)

	{

	TRect rcpy(aRect);

	rcpy.Move(iOrigin);

	TruncateRect(rcpy);

	TPoint startIntersect = aStart + iOrigin, endIntersect = aEnd + iOrigin;

	TInt startQuadrant, endQuadrant;

	TBool quadrants[5];

	const TBool isEllipse = AnalyseEllipse(

		rcpy, startIntersect, endIntersect, startQuadrant, endQuadrant, quadrants);

	if (iBrushStyle!=DirectGdi::ENullBrush)

		{

		if (isEllipse)

			EllipseFill(rcpy);

		else

			PieFill(rcpy, startIntersect, endIntersect, startQuadrant, endQuadrant, quadrants);

		}

	if ((iPenStyle!=DirectGdi::ENullPen) && (iPenSize.iWidth>0) && (iPenSize.iHeight>0))

		PieArcOutline(rcpy,aStart+iOrigin,aEnd+iOrigin,ETrue);

	}

/**

Calculates which quadrants are completely filled and which quadrants contain the 

start and end points.

@param aRect      The bounding rectangle. 

@param aStart     The arc start point.

@param aEnd	      The arc end point.

@param aStartQuad On return, contains the quadrant which contains aStart. 

@param aEndQuad   On return, contains the quadrant which contains aEnd.

@param aQuads     On return, populates an array of full quadrants to fill.

@pre Input params aRect, aStart, aEnd are to be given.

@post Output params aStart, aEnd, aStartQuad, aEndQuad, aQuads will be populated.

@return ETrue if the pie is an ellipse, otherwise EFalse.

*/

TBool CSwDirectGdiEngine::AnalyseEllipse(const TRect& aRect,TPoint& aStart,TPoint& aEnd,

							   TInt& aStartQuad,TInt& aEndQuad,TBool* aQuads)

	{

	aStartQuad=0;

	aEndQuad=0;

	const TPoint center = aRect.Center();

	TSwDirectGdiEllipse ellipse;

	aStart=ellipse.Intersection(aRect,aStart);

	aEnd=ellipse.Intersection(aRect,aEnd);

	if (aStart==aEnd)

		{

		aQuads[0]=EFalse;

		aQuads[1]=ETrue;

		aQuads[2]=ETrue;

		aQuads[3]=ETrue;

		aQuads[4]=ETrue;

		return ETrue;

		}

	const TInt startx = aStart.iX - center.iX, starty = aStart.iY - center.iY;

	const TInt endx = aEnd.iX - center.iX, endy = aEnd.iY - center.iY;

	if (startx>=0) aStartQuad=1;

	if (starty>=0) aStartQuad+=2;

	if (endx>=0) aEndQuad=1;

	if (endy>=0) aEndQuad+=2;

	aQuads[1]=EFalse,aQuads[2]=EFalse,aQuads[3]=EFalse,aQuads[4]=EFalse; // complete quadrants to draw

	aQuads[0]=EFalse; // ellipse is a sliver completely within a quadrant

	if (aStartQuad==aEndQuad)

		{

		if (aStartQuad==0 && (startx<endx || starty>endy))

			{

			aQuads[2]=ETrue;

			aQuads[3]=ETrue;

			aQuads[4]=ETrue;

			}

		else if (aStartQuad==1 && (startx<endx || starty<endy))

			{

			aQuads[1]=ETrue;

			aQuads[3]=ETrue;

			aQuads[4]=ETrue;

			}

		else if (aStartQuad==2 && (startx>endx || starty>endy))

			{

			aQuads[1]=ETrue;

			aQuads[2]=ETrue;

			aQuads[4]=ETrue;

			}

		else if (aStartQuad==3 && (startx>endx || starty<endy))

			{

			aQuads[1]=ETrue;

			aQuads[2]=ETrue;

			aQuads[3]=ETrue;

			}

		else aQuads[0]=ETrue; // "slice"

		}

	else

		{

		if (aStartQuad==0 && aEndQuad==1)

			{

			aQuads[3]=ETrue;

			aQuads[4]=ETrue;

			}

		else if (aStartQuad==0 && aEndQuad==3)

			aQuads[3]=ETrue;

		else if (aStartQuad==1 && aEndQuad==2)

			aQuads[1]=ETrue;

		else if (aStartQuad==1 && aEndQuad==3)

			{

			aQuads[1]=ETrue;

			aQuads[3]=ETrue;

			}

		else if (aStartQuad==2 && aEndQuad==0)

			{

			aQuads[2]=ETrue;

			aQuads[4]=ETrue;

			}

		else if (aStartQuad==2 && aEndQuad==1)

			aQuads[4]=ETrue;

		else if (aStartQuad==3 && aEndQuad==0)

			aQuads[2]=ETrue;

		else if (aStartQuad==3 && aEndQuad==2)

			{

			aQuads[1]=ETrue;

			aQuads[2]=ETrue;

			}

		}

	return EFalse;

	}

/**

Draws the outline of a pie or arc.

@param aRect  The bounding rectangle. 

@param aStart The arc start point.

@param aEnd	  The arc end point.

@param aPie If this is the outline for a pie ETrue, else EFalse

*/

void CSwDirectGdiEngine::PieArcOutline(const TRect& aRect,const TPoint& aStart,

							  const TPoint& aEnd,TBool aPie)

	{

	// arc runs counterclockwise, from startradius-center/ellipse intersect to endradius-center/ellipse intersect

	TInt dotparam=iDotParam;

	TRect rcpy(aRect);

	TPoint pt[4];

	TInt halfpenwidth=iPenSize.iWidth>>1;

	TInt halfpenheight=iPenSize.iHeight>>1;

	TInt otherhalfwidth=(iPenSize.iWidth+1)>>1;

	TInt otherhalfheight=(iPenSize.iHeight+1)>>1;

	rcpy.iTl.iX-=halfpenwidth;

	rcpy.iTl.iY-=halfpenheight;

	rcpy.iBr.iX+=otherhalfwidth;

	rcpy.iBr.iY+=otherhalfheight;

	TRect clipRect(0,0,0,0);

	for(TInt count=0;count<iDefaultRegionPtr->Count();count++)

		{

		clipRect=(*iDefaultRegionPtr)[count];

		if (!clipRect.Intersects(rcpy))

			continue;

		clipRect.Intersection(rcpy);

		TSwDirectGdiArc arc;

		arc.Construct(aRect,aStart,aEnd);

		iDotParam=Max(iPenSize.iWidth>>1,iPenSize.iHeight>>1);

		TBool dotl,dotr,dobl,dobr;

		while(!arc.SingleStep(pt[0],dotl,pt[1],dotr,pt[2],dobl,pt[3],dobr))

			{

			if (dotl) PenDrawClipped(pt[0], clipRect);

			if (dotr) PenDrawClipped(pt[1], clipRect);

			if (dobl) PenDrawClipped(pt[2], clipRect);

			if (dobr) PenDrawClipped(pt[3], clipRect);

			iDotParam+=iDotDirection;

			}

		if (pt[0].iY==pt[2].iY)

			{

			if (dotl) PenDrawClipped(pt[0], clipRect);

			if (dotr) PenDrawClipped(pt[1], clipRect);

			}

		if (aPie)

			{

			TPoint temp;

			const TPoint center = aRect.Center();

			TLinearDDA line;

			line.Construct(arc.iStart,center);

			line.SingleStep(temp);

			while(!line.SingleStep(temp))

				{

				PenDrawClipped(temp, clipRect);

				iDotParam+=iDotDirection;

				}

			line.Construct(arc.iEnd,center);

			line.SingleStep(temp);

			while(!line.SingleStep(temp))

				{

				PenDrawClipped(temp, clipRect);

				iDotParam+=iDotDirection;

				}

			PenDrawClipped(center, clipRect);

			}

		iDrawDevice->UpdateRegion(clipRect);

		}

	iDotParam=dotparam;

	}

/**

Fills a pie.

@param aRect      The bounding rectangle. 

@param aStart     The arc start point.

@param aEnd	      The arc end point.

@param aStartQuad The quadrant which contains aStart. 

@param aEndQuad   The quadrant which contains aEnd.

@param aQuads     An array of full quadrants to fill.

@see CSwDirectGdiEngine::DrawPie

@see CSwDirectGdiEngine::AnalyseEllipse 

*/

void CSwDirectGdiEngine::PieFill(const TRect& aRect, const TPoint& aStart, const TPoint& aEnd,

						TInt aStartQuad, TInt aEndQuad, const TBool* aQuads)

	{

	// arc runs counterclockwise, from startradius-center/ellipse intersect to endradius-center/ellipse intersect

	const TInt limit = iDefaultRegionPtr->Count();

	TRect clipRect(0,0,0,0);

	for(TInt count=0;count<limit;count++)

		{

		clipRect=(*iDefaultRegionPtr)[count];

		if (!clipRect.Intersects(aRect))

			{

			continue;

			}

		clipRect.Intersection(aRect);

		if (!aQuads[0])

			{

			PieShell(aRect, aStart, aEnd, aQuads, aStartQuad, aEndQuad, clipRect);

			}

		else

			{

			PieSliver(aRect, aStart, aEnd, aStartQuad, clipRect);

			}

		iDrawDevice->UpdateRegion(clipRect);

		}

	}

/**

Draws a pie spanning one or more quadrants.

@param aRect      The bounding rectangle. 

@param aStart     The arc start point.

@param aEnd	      The arc end point.

@param aQuads     Array of full quadrants to fill.

@param aStartQuad The quadrant which contains aStart. 

@param aEndQuad   The quadrant which contains aEnd.

@param aClipRect  The rectangle to which the pie is clipped.

*/

void CSwDirectGdiEngine::PieShell(const TRect& aRect,const TPoint& aStart,

						 const TPoint& aEnd, const TBool* aQuads, TInt aStartQuad, 

						 TInt aEndQuad, TRect aClipRect)

	{

	TSwDirectGdiEllipse ellipse;

	ellipse.Construct(aRect);

	TInt c=aRect.Center().iX;

	TPoint pt[4];

	TPoint tl,tr,bl,br;

	TBool donestart=EFalse;

	TBool doneend=EFalse;

	TBool todostart=EFalse;

	TBool todoend=EFalse;

	while(!ellipse.NextStep(pt[0],pt[1],pt[2],pt[3]))

		{

		if (pt[aStartQuad].iY==aStart.iY)

			todostart=ETrue;

		if (pt[aEndQuad].iY==aEnd.iY)

			todoend=ETrue;

		pt[0].iX++;

		pt[1].iX--;

		pt[2].iX++;

		pt[3].iX--;

		tl.iY=pt[0].iY;

		tr.iY=pt[1].iY;

		bl.iY=pt[2].iY;

		br.iY=pt[3].iY;

		if (aQuads[1] || (aEndQuad==0 && !doneend)) // tl quadrant, half top end chord

			tl.iX=pt[0].iX;

		else tl.iX=c+1;

		if (aQuads[2] || (aStartQuad==1 && !donestart)) // tr quadrant, half top start chord

			tr.iX=pt[1].iX;

		else tr.iX=c;

		if (aQuads[3] || (aStartQuad==2 && !donestart)) // bl quadrant, half top start chord

			bl.iX=pt[2].iX;

		else bl.iX=c+1;

		if (aQuads[4] || (aEndQuad==3 && !doneend)) // br quadrant, half top end chord

			br.iX=pt[3].iX;

		else br.iX=c;

		ClipFillLine(tl,tr,aClipRect);

		ClipFillLine(bl,br,aClipRect);

		// do partial quadrants

		if (todostart)

			{

			if (aStartQuad==0)

				{

				tl.iX=pt[0].iX;

				tr.iX=aStart.iX;

				ClipFillLine(tl,tr,aClipRect);

				}

			else if (aStartQuad==3)

				{

				bl.iX=aStart.iX;

				br.iX=pt[3].iX;

				ClipFillLine(bl,br,aClipRect);

				}

			}

		if (todoend)

			{

			if (aEndQuad==2)

				{

				bl.iX=pt[2].iX;

				br.iX=aEnd.iX;

				ClipFillLine(bl,br,aClipRect);

				}

			else if (aEndQuad==1)

				{

				tl.iX=aEnd.iX;

				tr.iX=pt[1].iX;

				ClipFillLine(tl,tr,aClipRect);

				}

			}

		donestart=todostart;

		doneend=todoend;

		}

	tl.iX=c+1;

	tr.iX=c;

	if (pt[0].iY==pt[2].iY) // congruent mid lines

		{

		if (pt[aStartQuad].iY==aStart.iY)

			todostart=ETrue;

		if (pt[aEndQuad].iY==aEnd.iY)

			todoend=ETrue;

		pt[0].iX++;

		pt[1].iX--;

		tl.iY=pt[0].iY;

		tr.iY=tl.iY;

		TBool leftflag=EFalse;

		TBool rightflag=EFalse;

		if (aQuads[1] || (aEndQuad==0 && !doneend) ||

			aQuads[3] || (aStartQuad==2 && !donestart) ||

			(todostart && aStartQuad==0) || (todoend && aEndQuad==2))

			leftflag=ETrue;

		if (aQuads[2] || (aStartQuad==1 && !donestart) ||

			aQuads[4] || (aEndQuad==3 && !doneend) ||

			(todostart && aStartQuad==3) || (todoend && aEndQuad==1))

			rightflag=ETrue;

		if (leftflag) tl.iX=pt[0].iX;

		if (rightflag) tr.iX=pt[1].iX;

		ClipFillLine(tl,tr,aClipRect);

		}

	else

		{

		tl.iY=aRect.Center().iY;

		tr.iY=tl.iY;

		if (aStartQuad==3) tr.iX=aStart.iX-1;

		if (aEndQuad==2) tl.iX=aEnd.iX+1;

		ClipFillLine(tl,tr,aClipRect);

		}

	PieTriangles(aStartQuad==1 || aStartQuad==2,aStart,aRect.Center(), aClipRect);

	PieTriangles(aEndQuad==0 || aEndQuad==3,aEnd,aRect.Center(), aClipRect);

	}

/**

Draws a filled triangle which forms part of a partially filled quadrant.

@param aInside A boolean value indicating which side of the line to fill.

@param aStart The start of the line which forms the hypotenuse of the triangle.

@param aEnd The end of the line which forms the hypotenuse of the triangle.

@param aClipRect The rectangle to which the pie is clipped.

@see CSwDirectGdiEngine::PieShell 

*/

void CSwDirectGdiEngine::PieTriangles(TBool aInside,const TPoint& aStart,const TPoint& aEnd, TRect aClipRect)

	{

	TInt x=aInside?aEnd.iX:aStart.iX;

	if (aStart.iX>aEnd.iX)

		{

		if (aInside)

			{

			x++;

			}

		else

			{

			x--;

			}

		}

	else

		{

		if (!aInside)

			{

			x++;

			}

		}

	TLinearDDA line;

	TPoint pt,left,right;

	line.Construct(aStart,aEnd);

	line.NextStep(pt);

	while(!line.NextStep(pt))

		{

		if (pt.iY==aEnd.iY) break;

		left.iX=Min(pt.iX,x);

		right.iX=Max(pt.iX,x);

		left.iY=right.iY=pt.iY;

		ClipFillLine(left,right,aClipRect);

		}

	}

/**

Draws a pie entirely contained in one quadrant.

@param aRect The rectangle in which to draw the ellipse. 

@param aStart The arc start point.

@param aEnd	The arc end point.

@param aQuad The quadrant containing the pie.

@param aClipRect The rectangle to which the pie is clipped.

*/

void CSwDirectGdiEngine::PieSliver(const TRect& aRect,const TPoint& aStart,

						  const TPoint& aEnd, TInt aQuad, TRect aClipRect)

	{

	TPoint center=aRect.Center(),left,right;

	TPoint nearinter(aStart),farinter(aEnd);

	if (Abs(nearinter.iY-center.iY)>Abs(farinter.iY-center.iY))

		{

		nearinter=aEnd;

		farinter=aStart;

		}

	TBool ellipseComplete = EFalse;

	TPoint pt[4];

	TSwDirectGdiEllipse ellipse;

	ellipse.Construct(aRect);

	TLinearDDA mainline;

	mainline.Construct(farinter,center);

	ellipseComplete = ellipse.SingleStep(pt[0],pt[1],pt[2],pt[3]);

	mainline.SingleStep(right);

	do	{

		while(!ellipseComplete && pt[aQuad].iY!=right.iY)

			ellipseComplete = ellipse.NextStep(pt[0],pt[1],pt[2],pt[3]);

		left=pt[aQuad];

		while(!ellipseComplete && pt[aQuad].iY==right.iY)

			{

			left=pt[aQuad];

			ellipseComplete = ellipse.NextStep(pt[0],pt[1],pt[2],pt[3]);

			}

		if (right.iY==nearinter.iY || (ellipseComplete && (pt[0].iY != pt[2].iY)))

			break;

		if (left.iX>right.iX)

			{

			TInt temp=left.iX;

			left.iX=right.iX;

			right.iX=temp;

			}

		if(right==farinter && left.iX<=right.iX)

			{

			continue;

			}

		left.iX++;

		right.iX--;

		if (left.iX<=right.iX)

			ClipFillLine(left,right,aClipRect);

		}

	while(!mainline.NextStep(right));

	TPoint temppt;

	TLinearDDA line;

	line.Construct(nearinter,center);

	TBool linestat=EFalse;

	do

		linestat=line.SingleStep(temppt);

	while(temppt.iY!=right.iY && !linestat);

	do	{

		do	{

			left=temppt;

			linestat=line.SingleStep(temppt);

			}

		while(temppt.iY==right.iY && !linestat);

		if (ellipseComplete)

			break;

		if (left.iX>right.iX)

			{

			TInt temp=left.iX;

			left.iX=right.iX;

			right.iX=temp;

			}

		if(right==farinter && left.iX<=right.iX)

			{

			continue;

			}

		left.iX++;

		right.iX--;

		if (left.iX<=right.iX)

			ClipFillLine(left,right,aClipRect);

		}

	while(!mainline.NextStep(right));

	}