b3d9852309
Change-Id: If289dcbff125ac0088f01b5c9752f9f3173585dc Reviewed-on: https://gerrit.libreoffice.org/11020 Reviewed-by: David Tardon <dtardon@redhat.com> Tested-by: David Tardon <dtardon@redhat.com>
138 lines
3.9 KiB
C++
138 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <tools/link.hxx>
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#include <tools/line.hxx>
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#include <tools/helpers.hxx>
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#include <cstdlib>
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#include <math.h>
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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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bool Line::Intersection( const Line& rLine, Point& rIntersection ) const
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{
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double fX, fY;
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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 = true;
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}
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else
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bRet = false;
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return bRet;
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}
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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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bool bOk = 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 bool bGreater = ( fDen > 0. );
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bOk = 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 = false;
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}
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else if ( ( fA > 0. ) || ( fA < fDen ) )
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bOk = 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 = false;
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}
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else if ( ( fB > 0. ) || ( fB < fDen ) )
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bOk = 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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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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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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