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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <tools/line.hxx>
#include <tools/helpers.hxx>
#include <cmath>
namespace tools
{
double Line::GetLength() const
{
return hypot( maStart.X() - maEnd.X(), maStart.Y() - maEnd.Y() );
}
bool Line::Intersection( const Line& rLine, Point& rIntersection ) const
{
double fX, fY;
bool bRet;
if( Intersection( rLine, fX, fY ) )
{
rIntersection.setX( FRound( fX ) );
rIntersection.setY( FRound( fY ) );
bRet = true;
}
else
bRet = false;
return bRet;
}
bool Line::Intersection( const tools::Line& rLine, double& rIntersectionX, double& rIntersectionY ) const
{
const double fAx = static_cast<double>(maEnd.X()) - maStart.X();
const double fAy = static_cast<double>(maEnd.Y()) - maStart.Y();
const double fBx = static_cast<double>(rLine.maStart.X()) - rLine.maEnd.X();
const double fBy = static_cast<double>(rLine.maStart.Y()) - rLine.maEnd.Y();
const double fDen = fAy * fBx - fAx * fBy;
bool bOk = false;
if( fDen != 0. )
{
const double fCx = static_cast<double>(maStart.X()) - rLine.maStart.X();
const double fCy = static_cast<double>(maStart.Y()) - rLine.maStart.Y();
const double fA = fBy * fCx - fBx * fCy;
const bool bGreater = ( fDen > 0. );
bOk = true;
if ( bGreater )
{
if ( ( fA < 0. ) || ( fA > fDen ) )
bOk = false;
}
else if ( ( fA > 0. ) || ( fA < fDen ) )
bOk = false;
if ( bOk )
{
const double fB = fAx * fCy - fAy * fCx;
if ( bGreater )
{
if ( ( fB < 0. ) || ( fB > fDen ) )
bOk = false;
}
else if ( ( fB > 0. ) || ( fB < fDen ) )
bOk = false;
if( bOk )
{
const double fAlpha = fA / fDen;
rIntersectionX = ( maStart.X() + fAlpha * fAx );
rIntersectionY = ( maStart.Y() + fAlpha * fAy );
}
}
}
return bOk;
}
double Line::GetDistance( const double& rPtX, const double& rPtY ) const
{
double fDist;
if( maStart != maEnd )
{
const double fDistX = static_cast<double>(maEnd.X()) - maStart.X();
const double fDistY = static_cast<double>(maEnd.Y()) - maStart.Y();
const double fACX = static_cast<double>(maStart.X()) - rPtX;
const double fACY = static_cast<double>(maStart.Y()) - rPtY;
const double fL2 = fDistX * fDistX + fDistY * fDistY;
const double fR = ( fACY * -fDistY - fACX * fDistX ) / fL2;
const double fS = ( fACY * fDistX - fACX * fDistY ) / fL2;
if( fR < 0.0 )
{
fDist = hypot( maStart.X() - rPtX, maStart.Y() - rPtY );
if( fS < 0.0 )
fDist *= -1.0;
}
else if( fR <= 1.0 )
fDist = fS * sqrt( fL2 );
else
{
fDist = hypot( maEnd.X() - rPtX, maEnd.Y() - rPtY );
if( fS < 0.0 )
fDist *= -1.0;
}
}
else
fDist = hypot( maStart.X() - rPtX, maStart.Y() - rPtY );
return fDist;
}
} //namespace tools
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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