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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 <basegfx/vector/b2dvector.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/numeric/ftools.hxx>
namespace basegfx
{
B2DVector& B2DVector::normalize()
{
double fLen(scalar(*this));
if(fTools::equalZero(fLen))
{
mnX = 0.0;
mnY = 0.0;
}
else
{
const double fOne(1.0);
if(!fTools::equal(fOne, fLen))
{
fLen = sqrt(fLen);
if(!fTools::equalZero(fLen))
{
mnX /= fLen;
mnY /= fLen;
}
}
}
return *this;
}
double B2DVector::getLength() const
{
if(fTools::equalZero(mnX))
{
return fabs(mnY);
}
else if(fTools::equalZero(mnY))
{
return fabs(mnX);
}
return hypot( mnX, mnY );
}
double B2DVector::angle( const B2DVector& rVec ) const
{
return atan2(mnX * rVec.getY() - mnY * rVec.getX(),
mnX * rVec.getX() + mnY * rVec.getY());
}
const B2DVector& B2DVector::getEmptyVector()
{
return static_cast<const B2DVector&>( B2DTuple::getEmptyTuple() );
}
B2DVector& B2DVector::operator*=( const B2DHomMatrix& rMat )
{
const double fTempX( rMat.get(0,0)*mnX +
rMat.get(0,1)*mnY );
const double fTempY( rMat.get(1,0)*mnX +
rMat.get(1,1)*mnY );
mnX = fTempX;
mnY = fTempY;
return *this;
}
B2DVector& B2DVector::setLength(double fLen)
{
double fLenNow(scalar(*this));
if(!fTools::equalZero(fLenNow))
{
const double fOne(1.0);
if(!fTools::equal(fOne, fLenNow))
{
fLen /= sqrt(fLenNow);
}
mnX *= fLen;
mnY *= fLen;
}
return *this;
}
bool areParallel( const B2DVector& rVecA, const B2DVector& rVecB )
{
const double fValA(rVecA.getX() * rVecB.getY());
const double fValB(rVecA.getY() * rVecB.getX());
return fTools::equal(fValA, fValB);
}
B2VectorOrientation getOrientation( const B2DVector& rVecA, const B2DVector& rVecB )
{
double fVal(rVecA.getX() * rVecB.getY() - rVecA.getY() * rVecB.getX());
if(fTools::equalZero(fVal))
{
return B2VectorOrientation::Neutral;
}
if(fVal > 0.0)
{
return B2VectorOrientation::Positive;
}
else
{
return B2VectorOrientation::Negative;
}
}
B2DVector getPerpendicular( const B2DVector& rNormalizedVec )
{
B2DVector aPerpendicular(-rNormalizedVec.getY(), rNormalizedVec.getX());
return aPerpendicular;
}
B2DVector getNormalizedPerpendicular( const B2DVector& rVec )
{
B2DVector aPerpendicular(rVec);
aPerpendicular.normalize();
const double aTemp(-aPerpendicular.getY());
aPerpendicular.setY(aPerpendicular.getX());
aPerpendicular.setX(aTemp);
return aPerpendicular;
}
B2DVector operator*( const B2DHomMatrix& rMat, const B2DVector& rVec )
{
B2DVector aRes( rVec );
aRes *= rMat;
return aRes;
}
B2VectorContinuity getContinuity(const B2DVector& rBackVector, const B2DVector& rForwardVector )
{
if(rBackVector.equalZero() || rForwardVector.equalZero())
{
return B2VectorContinuity::NONE;
}
if(fTools::equal(rBackVector.getX(), -rForwardVector.getX()) && fTools::equal(rBackVector.getY(), -rForwardVector.getY()))
{
// same direction and same length -> C2
return B2VectorContinuity::C2;
}
if(areParallel(rBackVector, rForwardVector) && rBackVector.scalar(rForwardVector) < 0.0)
{
// parallel and opposite direction -> C1
return B2VectorContinuity::C1;
}
return B2VectorContinuity::NONE;
}
} // end of namespace basegfx
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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