/* -*- 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>

#include <basegfx/vector/b2enums.hxx>

#include <cassert>

namespace basegfx

{

    B2DVector& B2DVector::normalize()

    {

        double fLen(std::hypot(mnX, mnY));

        if(!fTools::equalZero(fLen))

        {

            assert(fLen != 0 && "help coverity see it's not zero");

            const double fOne(1.0);

            if(!fTools::equal(fOne, fLen))

            {

                mnX /= fLen;

                mnY /= fLen;

            }

        }

        else

        {

            mnX = 0.0;

            mnY = 0.0;

        }

        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(std::hypot(mnX, mnY));

        if(!fTools::equalZero(fLenNow))

        {

            assert(fLenNow != 0 && "help coverity see it's not zero");

            const double fOne(1.0);

            if(!fTools::equal(fOne, fLenNow))

            {

                fLen /= 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

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