364 lines
10 KiB
C++
364 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#define _LINE_CXX
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#include <tools/link.hxx>
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#include <tools/line.hxx>
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#include <tools/debug.hxx>
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#include <cstdlib>
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#include <math.h>
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// --------
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// - Line -
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// --------
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double Line::GetLength() const
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{
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return hypot( maStart.X() - maEnd.X(), maStart.Y() - maEnd.Y() );
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}
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// ------------------------------------------------------------------------
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sal_Bool Line::Intersection( const Line& rLine, Point& rIntersection ) const
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{
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double fX, fY;
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sal_Bool bRet;
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if( Intersection( rLine, fX, fY ) )
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{
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rIntersection.X() = FRound( fX );
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rIntersection.Y() = FRound( fY );
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bRet = sal_True;
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}
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else
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bRet = sal_False;
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return bRet;
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}
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// ------------------------------------------------------------------------
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sal_Bool Line::Intersection( const Line& rLine, double& rIntersectionX, double& rIntersectionY ) const
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{
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const double fAx = maEnd.X() - maStart.X();
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const double fAy = maEnd.Y() - maStart.Y();
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const double fBx = rLine.maStart.X() - rLine.maEnd.X();
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const double fBy = rLine.maStart.Y() - rLine.maEnd.Y();
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const double fDen = fAy * fBx - fAx * fBy;
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sal_Bool bOk = sal_False;
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if( fDen != 0. )
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{
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const double fCx = maStart.X() - rLine.maStart.X();
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const double fCy = maStart.Y() - rLine.maStart.Y();
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const double fA = fBy * fCx - fBx * fCy;
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const sal_Bool bGreater = ( fDen > 0. );
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bOk = sal_True;
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if ( bGreater )
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{
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if ( ( fA < 0. ) || ( fA > fDen ) )
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bOk = sal_False;
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}
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else if ( ( fA > 0. ) || ( fA < fDen ) )
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bOk = sal_False;
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if ( bOk )
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{
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const double fB = fAx * fCy - fAy * fCx;
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if ( bGreater )
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{
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if ( ( fB < 0. ) || ( fB > fDen ) )
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bOk = sal_False;
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}
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else if ( ( fB > 0. ) || ( fB < fDen ) )
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bOk = sal_False;
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if( bOk )
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{
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const double fAlpha = fA / fDen;
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rIntersectionX = ( maStart.X() + fAlpha * fAx );
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rIntersectionY = ( maStart.Y() + fAlpha * fAy );
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}
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}
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}
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return bOk;
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}
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// ------------------------------------------------------------------------
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sal_Bool Line::Intersection( const Rectangle& rRect, Line& rIntersection ) const
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{
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const sal_Bool bStartInside = rRect.IsInside( maStart );
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const sal_Bool bEndInside = rRect.IsInside( maEnd );
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sal_Bool bRet = sal_True;
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if( bStartInside && bEndInside )
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{
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// line completely inside rect
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rIntersection.maStart = maStart;
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rIntersection.maEnd = maEnd;
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}
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else
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{
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// calculate intersections
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const Point aTL( rRect.TopLeft() ), aTR( rRect.TopRight() );
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const Point aBR( rRect.BottomRight() ), aBL( rRect.BottomLeft() );
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Point aIntersect1, aIntersect2;
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Point* pCurIntersection = &aIntersect1;
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if( Intersection( Line( aTL, aTR ), *pCurIntersection ) )
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pCurIntersection = &aIntersect2;
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if( Intersection( Line( aTR, aBR ), *pCurIntersection ) )
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pCurIntersection = ( pCurIntersection == &aIntersect1 ) ? &aIntersect2 : NULL;
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if( pCurIntersection && Intersection( Line( aBR, aBL ), *pCurIntersection ) )
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pCurIntersection = ( pCurIntersection == &aIntersect1 ) ? &aIntersect2 : NULL;
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if( pCurIntersection && Intersection( Line( aBL, aTL ), *pCurIntersection ) )
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pCurIntersection = ( pCurIntersection == &aIntersect1 ) ? &aIntersect2 : NULL;
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if( !pCurIntersection )
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{
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// two intersections
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rIntersection.maStart = aIntersect1;
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rIntersection.maEnd = aIntersect2;
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}
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else if( pCurIntersection == &aIntersect2 )
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{
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// one intersection
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rIntersection.maStart = aIntersect1;
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if( ( maStart != aIntersect1 ) && bStartInside )
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rIntersection.maEnd = maStart;
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else if( ( maEnd != aIntersect1 ) && bEndInside )
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rIntersection.maEnd = maEnd;
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else
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rIntersection.maEnd = rIntersection.maStart;
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}
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else
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bRet = sal_False;
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}
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return bRet;
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}
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// ------------------------------------------------------------------------
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Point Line::NearestPoint( const Point& rPoint ) const
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{
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Point aRetPt;
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if ( maStart != maEnd )
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{
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const double fDistX = maEnd.X() - maStart.X();
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const double fDistY = maStart.Y() - maEnd.Y();
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const double fTau = ( ( maStart.Y() - rPoint.Y() ) * fDistY -
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( maStart.X() - rPoint.X() ) * fDistX ) /
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( fDistX * fDistX + fDistY * fDistY );
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if( fTau < 0.0 )
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aRetPt = maStart;
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else if( fTau <= 1.0 )
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{
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aRetPt.X() = FRound( maStart.X() + fTau * fDistX );
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aRetPt.Y() = FRound( maStart.Y() - fTau * fDistY );
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}
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else
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aRetPt = maEnd;
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}
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else
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aRetPt = maStart;
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return aRetPt;
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}
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// ------------------------------------------------------------------------
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double Line::GetDistance( const double& rPtX, const double& rPtY ) const
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{
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double fDist;
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if( maStart != maEnd )
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{
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const double fDistX = maEnd.X() - maStart.X();
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const double fDistY = maEnd.Y() - maStart.Y();
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const double fACX = maStart.X() - rPtX;
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const double fACY = maStart.Y() - rPtY;
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const double fL2 = fDistX * fDistX + fDistY * fDistY;
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const double fR = ( fACY * -fDistY - fACX * fDistX ) / fL2;
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const double fS = ( fACY * fDistX - fACX * fDistY ) / fL2;
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if( fR < 0.0 )
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{
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fDist = hypot( maStart.X() - rPtX, maStart.Y() - rPtY );
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if( fS < 0.0 )
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fDist *= -1.0;
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}
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else if( fR <= 1.0 )
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fDist = fS * sqrt( fL2 );
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else
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{
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fDist = hypot( maEnd.X() - rPtX, maEnd.Y() - rPtY );
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if( fS < 0.0 )
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fDist *= -1.0;
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}
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}
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else
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fDist = hypot( maStart.X() - rPtX, maStart.Y() - rPtY );
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return fDist;
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}
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// ------------------------------------------------------------------------
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void Line::Enum( const Link& rEnumLink )
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{
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DBG_ASSERT( rEnumLink.IsSet(), "This call doesn't make any sense with !rEnumLink.IsSet()" );
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Point aEnum;
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long nX;
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long nY;
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if( maStart.X() == maEnd.X() )
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{
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const long nEndY = maEnd.Y();
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nX = maStart.X();
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nY = maStart.Y();
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if( nEndY > nY )
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{
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while( nY <= nEndY )
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{
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aEnum.X() = nX;
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aEnum.Y() = nY++;
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rEnumLink.Call( &aEnum );
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}
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}
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else
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{
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while( nY >= nEndY )
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{
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aEnum.X() = nX;
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aEnum.Y() = nY--;
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rEnumLink.Call( &aEnum );
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}
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}
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}
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else if( maStart.Y() == maEnd.Y() )
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{
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const long nEndX = maEnd.X();
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nX = maStart.X();
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nY = maStart.Y();
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if( nEndX > nX )
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{
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while( nX <= nEndX )
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{
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aEnum.X() = nX++;
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aEnum.Y() = nY;
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rEnumLink.Call( &aEnum );
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}
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}
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else
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{
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while( nX >= nEndX )
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{
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aEnum.X() = nX--;
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aEnum.Y() = nY;
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rEnumLink.Call( &aEnum );
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}
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}
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}
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else
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{
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const long nDX = labs( maEnd.X() - maStart.X() );
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const long nDY = labs( maEnd.Y() - maStart.Y() );
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const long nStartX = maStart.X();
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const long nStartY = maStart.Y();
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const long nEndX = maEnd.X();
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const long nEndY = maEnd.Y();
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const long nXInc = ( nStartX < nEndX ) ? 1L : -1L;
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const long nYInc = ( nStartY < nEndY ) ? 1L : -1L;
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if( nDX >= nDY )
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{
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const long nDYX = ( nDY - nDX ) << 1;
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const long nDY2 = nDY << 1;
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long nD = nDY2 - nDX;
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for( nX = nStartX, nY = nStartY; nX != nEndX; nX += nXInc )
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{
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aEnum.X() = nX;
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aEnum.Y() = nY;
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rEnumLink.Call( &aEnum );
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if( nD < 0L )
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nD += nDY2;
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else
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nD += nDYX, nY += nYInc;
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}
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}
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else
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{
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const long nDYX = ( nDX - nDY ) << 1;
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const long nDY2 = nDX << 1;
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long nD = nDY2 - nDY;
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for( nX = nStartX, nY = nStartY; nY != nEndY; nY += nYInc )
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{
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aEnum.X() = nX;
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aEnum.Y() = nY;
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rEnumLink.Call( &aEnum );
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if( nD < 0L )
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nD += nDY2;
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else
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nD += nDYX, nX += nXInc;
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}
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}
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// last point
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aEnum.X() = nEndX;
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aEnum.Y() = nEndY;
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rEnumLink.Call( &aEnum );
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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