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// Copyright (c) 1997-2009 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:
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//
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#include <bitstd.h>
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#include <bitdev.h>
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#include "BITPANIC.H"
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#include <bitdraw.h>
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#include <graphics/fbsrasterizer.h>
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/*
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* TEllipse
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*/
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/**
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Initialises the values of the ellipse so that it conforms to a rectangle entered as a parameter.
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@param aRect the rectangle within which the ellipse is drawn
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*/
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EXPORT_C void TEllipse::Construct(const TRect& aRect)
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{
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TInt width=aRect.Width();
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TInt height=aRect.Height();
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iA=(width-1)>>1;
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iB=(height-1)>>1;
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iXAdj=(width+1)&1;
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iYAdj=(height+1)&1;
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iOffset=aRect.iTl;
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iX=0;
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iY=iB;
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iASquared=iA*iA;
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iBSquared=iB*iB;
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iASquBSqu=iASquared*iBSquared;
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iD1=iBSquared-iASquared*iB+(iASquared>>1);
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if(width<=0 || height<=0)
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iStatus=EComplete;
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else if(width<=2 || height<=2)
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iStatus=ELine;
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else if(iA+iXAdj==0 || iB+iYAdj==0)
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iStatus=EComplete;
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else
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iStatus=EInitialised;
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}
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/**
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Does the next stage in producing an ellipse by taking four points (the corners of
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the rectangle the ellipse should fill) as parameters. Updates TEllipse status
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accordingly and calls <code>Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight)</code>.
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@param aTopLeft Top left corner of rectangle
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@param aTopRight Top right corner of rectangle
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@param aBottomLeft Bottom left corner of rectangle
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@param aBottomRight Bottom right corner of rectangle
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@return TBool ETrue if step completed successfully.
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*/
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EXPORT_C TBool TEllipse::SingleStep(TPoint& aTopLeft,TPoint& aTopRight,
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TPoint& aBottomLeft,TPoint& aBottomRight)
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{
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TBool ret=EFalse;
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if(iStatus==EFirstSector)
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{
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if(iD1<0)
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iD1+=iBSquared*((iX<<1)+3);
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else if(iY>0)
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{
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iD1+=iBSquared*((iX<<1)+3)+iASquared*(2-(iY<<1));
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iY--;
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}
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iX++;
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ret=Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight);
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if(iStatus==EComplete && iX<iA)
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{
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iStatus=EFirstSector;
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return(EFalse);
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}
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if(iASquared*iY<=iBSquared*(iX+1) && ret==EFalse)
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{
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iStatus=ESecondSector;
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iD2=-iASquBSqu+iBSquared*iX*iX+iASquared*(iY-1)*(iY-1);
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}
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return(ret);
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}
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if(iStatus==ESecondSector)
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{
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if(iD2<0)
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{
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iD2+=iBSquared*((iX<<1)+2)+iASquared*(3-(iY<<1));
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iX++;
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}
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else
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iD2+=iASquared*(3-(iY<<1));
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iY--;
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return(Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight));
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}
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if(iStatus==ELine)
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{
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ret=Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight);
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if(iA==0)
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iY--;
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else
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{
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iX++;
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if(iX>iA+iXAdj) ret=ETrue;
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else
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{
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iStatus=ELine;
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ret=EFalse;
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}
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}
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return(ret);
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}
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if(iStatus==EInitialised)
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{
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iStatus=EFirstSector;
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return(Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight));
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}
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Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight);
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return(ETrue);
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}
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/**
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Sets the absolute points that define the ellipse as calculated using its iOffset
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from the origin and using the half width and half height of the rectangle iA and iB.
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@param aTopLeft The absolute (x,y) position for the top left point.
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@param aTopRight The absolute (x,y) position for the top right point.
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@param aBottomLeft The absolute (x,y) position for the bottom left point.
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@param aBottomRight The absolute (x,y) position for the bottom right point.
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@return TBool ETrue if a valid rectangle is produced, else EFalse. Also sets
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iStatus to EComplete.
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*/
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EXPORT_C TBool TEllipse::Output(TPoint& aTopLeft,TPoint& aTopRight,
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TPoint& aBottomLeft,TPoint& aBottomRight)
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{
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TInt lx=iA-iX+iOffset.iX;
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TInt ty=iB-iY+iOffset.iY;
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TInt rx=iA+iX+iXAdj+iOffset.iX;
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TInt by=iB+iY+iYAdj+iOffset.iY;
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aTopLeft.SetXY(lx,ty);
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aTopRight.SetXY(rx,ty);
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aBottomLeft.SetXY(lx,by);
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aBottomRight.SetXY(rx,by);
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if(iY<=0)
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{
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iStatus=EComplete;
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if(iYAdj==0 || ty>by)
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return(ETrue);
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}
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return(EFalse);
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}
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/**
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By analysing the current state of the ellipse the process is taken to the next appropriate step.
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If iStatus = EInitialised only one step will be taken, if the ellipse is already semi constructed then
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it will be taken to completion. Takes in four point parameters that defines the rectangle in order to pass to
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SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight).
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@param aTopLeft Top left corner of rectangle
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@param aTopRight Top right corner of rectangle
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@param aBottomLeft Bottom left corner of rectangle
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@param aBottomRight Bottom right corner of rectangle
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@return TBool ETrue if a valid rectangle is produced, else EFalse.
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*/
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EXPORT_C TBool TEllipse::NextStep(TPoint& aTopLeft,TPoint& aTopRight,
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TPoint& aBottomLeft,TPoint& aBottomRight)
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{
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if(iStatus==EInitialised)
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return(SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight));
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TInt prevlev=iY;
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TBool ret;
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do
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ret=SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight);
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while(prevlev==iY && ret==EFalse);
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return(ret);
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}
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/**
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Constructs an ellipse from the rectangle which it is given and assesses the
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points position with regard to the ellipse and where they intersect.
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@param aRect The rectangle within which the ellipse is drawn.
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@param aPoint A point to compare with the ellipse to determine if intersection occurs.
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@return TPoint The point is set to the corner which the intersection is nearest to.
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*/
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EXPORT_C TPoint TEllipse::Intersection(const TRect& aRect,const TPoint& aPoint)
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{
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Construct(aRect); //constructs the rect (an elipse object)
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TPoint centre=aRect.Center(); //centre of ellipse
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TPoint ptcpy(aPoint);
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ptcpy-=iOffset; //ptcpy = aPoint - iOffset - TPoint(iA,iB) //radius from centre of ellipse
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ptcpy-=TPoint(iA,iB);
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TPoint pt[4],opt[4];
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TInt mpt[4],ompt[4];
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TInt count=0;
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for(;count<4;count++)
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ompt[count]=KMaxTInt; //fills ompt 1->4 with KMaxTInt
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while(SingleStep(pt[0],pt[1],pt[2],pt[3])==EFalse) //creates a complete ellipse with pts as rect
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for(count=0;count<4;count++)
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{
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mpt[count]=Abs((pt[count].iY-iOffset.iY-iB)*(ptcpy.iX)-(ptcpy.iY)*(pt[count].iX-iOffset.iX-iA));
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if(mpt[count]<ompt[count]) //use the larger number set.
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{
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ompt[count]=mpt[count];
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opt[count]=pt[count];
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}
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}
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if(pt[0].iY==pt[2].iY) //if it is horizontal
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for(count=0;count<4;count++)
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{
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mpt[count]=Abs((pt[count].iY-iOffset.iY-iB)*(ptcpy.iX)-(ptcpy.iY)*(pt[count].iX-iOffset.iX-iA));
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if(mpt[count]<ompt[count]) //use the larger number set.
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{
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ompt[count]=mpt[count];
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opt[count]=pt[count];
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}
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}
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if(ptcpy.iX<0 && ptcpy.iY<0) //if point is further left and higher than centre of rect
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return(opt[0]);
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if(ptcpy.iY<0) //if point is higher than centre of rect
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return(opt[1]);
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if(ptcpy.iX<0) //if point is further left than centre of rect
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return(opt[2]);
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if(aPoint.iX<centre.iX && aPoint.iY<centre.iY) //if point is further left and higher than centre of rect
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return(opt[0]);
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if(aPoint.iY<centre.iY) //if point is higher than centre of rect
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return(opt[1]);
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if(aPoint.iX<centre.iX) //if point is further left than centre of rect
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return(opt[2]);
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return(opt[3]); //else
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}
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//
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// Ellipse drawing
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//
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/**
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Draws and fills an ellipse.
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The function provides a concrete implementation of the pure virtual
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function <code>CGraphicsContext::DrawEllipse()</code>. The function
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behaviour is the same as documented in that class.
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*/
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EXPORT_C void CFbsBitGc::DrawEllipse(const TRect& aRect)
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{
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if(CheckDevice(aRect)) return;
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TRect rcpy(aRect);
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rcpy.Move(iOrigin);
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iDevice->TruncateRect(rcpy);
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TRect clippedRect(rcpy);
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clippedRect.Grow((iPenSize.iWidth>>1)+1,(iPenSize.iHeight>>1)+1);
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if(UserClipRect(clippedRect)) return;
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SetupDevice();
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iDevice->DrawingBegin(&iBrushBitmap);
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CFbsRasterizer* brushRasterizer = PrepareRasterizerForExtendedBitmap(iBrushBitmap);
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if(iBrushStyle!=ENullBrush)
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EllipseFill(rcpy);
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if(iPenStyle!=ENullPen)
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{
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if(iPenSize.iWidth>1 && iPenSize.iHeight>1)
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EllipseOutlineWide(rcpy);
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else
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if(iPenSize.iWidth==1 || iPenSize.iHeight==1)
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EllipseOutline(rcpy);
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}
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if (brushRasterizer)
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{
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brushRasterizer->EndBitmap(iBrushBitmap.SerialNumber());
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}
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iDevice->DrawingEnd(&iBrushBitmap);
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}
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void CFbsBitGc::EllipseOutline(const TRect& aRect)
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{
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CFbsDrawDevice* drawDevice = iDevice->iDrawDevice;
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TPoint tl,tr,bl,br;
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AddRect(aRect);
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#if defined(_DEBUG)
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TRect deviceDestRect;
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drawDevice->GetDrawRect(deviceDestRect);
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#endif
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for(TInt count=0;count<iDefaultRegionPtr->Count();count++)
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{
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iClipRect=(*iDefaultRegionPtr)[count];
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if(!iClipRect.Intersects(aRect))
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continue;
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iClipRect.Intersection(aRect);
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if(UserClipRect(iClipRect)) continue;
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BG_ASSERT_DEBUG(iClipRect.iTl.iX >= deviceDestRect.iTl.iX, EBitgdiPanicOutOfBounds);
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BG_ASSERT_DEBUG(iClipRect.iTl.iY >= deviceDestRect.iTl.iY, EBitgdiPanicOutOfBounds);
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BG_ASSERT_DEBUG(iClipRect.iBr.iX <= deviceDestRect.iBr.iX, EBitgdiPanicOutOfBounds);
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BG_ASSERT_DEBUG(iClipRect.iBr.iY <= deviceDestRect.iBr.iY, EBitgdiPanicOutOfBounds);
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TEllipse ellipse;
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ellipse.Construct(aRect);
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TInt pattern=0;
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while(!ellipse.SingleStep(tl,tr,bl,br))
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{
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if(iPenStyle==CGraphicsContext::ESolidPen || (iDotMask&(1<<(pattern%iDotLength))))
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|
304 |
{
|
sl@0
|
305 |
if(tl.iY>=iClipRect.iTl.iY && tl.iY<iClipRect.iBr.iY)
|
sl@0
|
306 |
{
|
sl@0
|
307 |
if(tl.iX>=iClipRect.iTl.iX && tl.iX<iClipRect.iBr.iX)
|
sl@0
|
308 |
drawDevice->WriteRgb(tl.iX,tl.iY,iPenColor,iDrawMode);
|
sl@0
|
309 |
if(tr.iX>=iClipRect.iTl.iX && tr.iX<iClipRect.iBr.iX && tl.iX!=tr.iX)
|
sl@0
|
310 |
drawDevice->WriteRgb(tr.iX,tr.iY,iPenColor,iDrawMode);
|
sl@0
|
311 |
}
|
sl@0
|
312 |
if(bl.iY>=iClipRect.iTl.iY && bl.iY<iClipRect.iBr.iY)
|
sl@0
|
313 |
{
|
sl@0
|
314 |
if(bl.iX>=iClipRect.iTl.iX && bl.iX<iClipRect.iBr.iX)
|
sl@0
|
315 |
drawDevice->WriteRgb(bl.iX,bl.iY,iPenColor,iDrawMode);
|
sl@0
|
316 |
if(br.iX>=iClipRect.iTl.iX && br.iX<iClipRect.iBr.iX && bl.iX!=br.iX)
|
sl@0
|
317 |
drawDevice->WriteRgb(br.iX,br.iY,iPenColor,iDrawMode);
|
sl@0
|
318 |
}
|
sl@0
|
319 |
}
|
sl@0
|
320 |
pattern++;
|
sl@0
|
321 |
}
|
sl@0
|
322 |
if(tl.iY==bl.iY && tl.iY>=iClipRect.iTl.iY && tl.iY<iClipRect.iBr.iY)
|
sl@0
|
323 |
{
|
sl@0
|
324 |
if(tl.iX>=iClipRect.iTl.iX && tl.iX<iClipRect.iBr.iX)
|
sl@0
|
325 |
drawDevice->WriteRgb(tl.iX,tl.iY,iPenColor,iDrawMode);
|
sl@0
|
326 |
if(tr.iX>=iClipRect.iTl.iX && tr.iX<iClipRect.iBr.iX && tl.iX!=tr.iX)
|
sl@0
|
327 |
drawDevice->WriteRgb(tr.iX,tr.iY,iPenColor,iDrawMode);
|
sl@0
|
328 |
}
|
sl@0
|
329 |
drawDevice->UpdateRegion(iClipRect);
|
sl@0
|
330 |
}
|
sl@0
|
331 |
}
|
sl@0
|
332 |
|
sl@0
|
333 |
void CFbsBitGc::EllipseOutlineWide(const TRect& aRect)
|
sl@0
|
334 |
{
|
sl@0
|
335 |
TRect rcpy(aRect);
|
sl@0
|
336 |
TPoint tl,tr,bl,br;
|
sl@0
|
337 |
TInt halfpenwidth=(iPenSize.iWidth+1)>>1;
|
sl@0
|
338 |
TInt halfpenheight=(iPenSize.iHeight+1)>>1;
|
sl@0
|
339 |
rcpy.Grow(halfpenwidth,halfpenheight);
|
sl@0
|
340 |
AddRect(rcpy);
|
sl@0
|
341 |
TInt dp=iDotParam;
|
sl@0
|
342 |
for(TInt count=0;count<iDefaultRegionPtr->Count();count++)
|
sl@0
|
343 |
{
|
sl@0
|
344 |
iClipRect=(*iDefaultRegionPtr)[count];
|
sl@0
|
345 |
if(!iClipRect.Intersects(rcpy))
|
sl@0
|
346 |
continue;
|
sl@0
|
347 |
iClipRect.Intersection(rcpy);
|
sl@0
|
348 |
if(UserClipRect(iClipRect)) continue;
|
sl@0
|
349 |
TEllipse ellipse;
|
sl@0
|
350 |
ellipse.Construct(aRect);
|
sl@0
|
351 |
iDotParam=Max(iPenSize.iWidth>>1,iPenSize.iHeight>>1);
|
sl@0
|
352 |
while(!ellipse.SingleStep(tl,tr,bl,br))
|
sl@0
|
353 |
{
|
sl@0
|
354 |
PenDrawClipped(tl);
|
sl@0
|
355 |
PenDrawClipped(tr);
|
sl@0
|
356 |
PenDrawClipped(bl);
|
sl@0
|
357 |
PenDrawClipped(br);
|
sl@0
|
358 |
iDotParam+=iDotDirection;
|
sl@0
|
359 |
}
|
sl@0
|
360 |
if(tl.iY==bl.iY)
|
sl@0
|
361 |
{
|
sl@0
|
362 |
PenDrawClipped(tl);
|
sl@0
|
363 |
PenDrawClipped(tr);
|
sl@0
|
364 |
}
|
sl@0
|
365 |
iDevice->iDrawDevice->UpdateRegion(iClipRect);
|
sl@0
|
366 |
}
|
sl@0
|
367 |
iDotParam=dp;
|
sl@0
|
368 |
}
|
sl@0
|
369 |
|
sl@0
|
370 |
// if iBrushBitmap is an extended bitmap, PrepareRasterizerForExtendedBitmap() must have been called before this method
|
sl@0
|
371 |
void CFbsBitGc::EllipseFill(const TRect& aRect)
|
sl@0
|
372 |
{
|
sl@0
|
373 |
TRect rcpy(aRect);
|
sl@0
|
374 |
if(iPenSize.iWidth==0 || iPenSize.iHeight==0)
|
sl@0
|
375 |
rcpy.Grow(1,1);
|
sl@0
|
376 |
AddRect(aRect);
|
sl@0
|
377 |
TPoint tl,tr,bl,br;
|
sl@0
|
378 |
for(TInt count=0;count<iDefaultRegionPtr->Count();count++)
|
sl@0
|
379 |
{
|
sl@0
|
380 |
iClipRect=(*iDefaultRegionPtr)[count];
|
sl@0
|
381 |
if(!iClipRect.Intersects(rcpy))
|
sl@0
|
382 |
continue;
|
sl@0
|
383 |
iClipRect.Intersection(rcpy);
|
sl@0
|
384 |
if(UserClipRect(iClipRect)) continue;
|
sl@0
|
385 |
TEllipse ellipse;
|
sl@0
|
386 |
ellipse.Construct(rcpy);
|
sl@0
|
387 |
while(!ellipse.NextStep(tl,tr,bl,br))
|
sl@0
|
388 |
{
|
sl@0
|
389 |
tl.iX++;
|
sl@0
|
390 |
tr.iX--;
|
sl@0
|
391 |
bl.iX++;
|
sl@0
|
392 |
br.iX--;
|
sl@0
|
393 |
ClipFillLine(tl,tr);
|
sl@0
|
394 |
ClipFillLine(bl,br);
|
sl@0
|
395 |
}
|
sl@0
|
396 |
if(tl.iY==bl.iY)
|
sl@0
|
397 |
{
|
sl@0
|
398 |
tl.iX++;
|
sl@0
|
399 |
tr.iX--;
|
sl@0
|
400 |
ClipFillLine(tl,tr);
|
sl@0
|
401 |
}
|
sl@0
|
402 |
iDevice->iDrawDevice->UpdateRegion(iClipRect);
|
sl@0
|
403 |
}
|
sl@0
|
404 |
}
|
sl@0
|
405 |
|