/* -*- 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/curve/b2dbeziertools.hxx>

#include <basegfx/curve/b2dcubicbezier.hxx>

#include <basegfx/vector/b2dvector.hxx>

#include <algorithm>

#include <cassert>

namespace basegfx

{

    B2DCubicBezierHelper::B2DCubicBezierHelper(const B2DCubicBezier& rBase, sal_uInt32 nDivisions)

    :   mnEdgeCount(0)

    {

        const bool bIsBezier(rBase.isBezier());

        if(bIsBezier)

        {

            // check nDivisions; at least one is needed, but also prevent too big values

            if(nDivisions < 1)

            {

                nDivisions = 1;

            }

            else if(nDivisions > 1000)

            {

                nDivisions = 1000;

            }

            // set nEdgeCount

            mnEdgeCount = nDivisions + 1;

            // fill in maLengthArray

            maLengthArray.clear();

            maLengthArray.reserve(mnEdgeCount);

            B2DPoint aCurrent(rBase.getStartPoint());

            double fLength(0.0);

            for(sal_uInt32 a(1);;)

            {

                const B2DPoint aNext(rBase.interpolatePoint(static_cast<double>(a) / static_cast<double>(mnEdgeCount)));

                const B2DVector aEdge(aNext - aCurrent);

                fLength += aEdge.getLength();

                maLengthArray.push_back(fLength);

                if(++a < mnEdgeCount)

                {

                    aCurrent = aNext;

                }

                else

                {

                    const B2DPoint& aLastNext(rBase.getEndPoint());

                    const B2DVector aLastEdge(aLastNext - aNext);

                    fLength += aLastEdge.getLength();

                    maLengthArray.push_back(fLength);

                    break;

                }

            }

        }

        else

        {

            maLengthArray.clear();

            maLengthArray.push_back(rBase.getEdgeLength());

            mnEdgeCount = 1;

        }

    }

    double B2DCubicBezierHelper::distanceToRelative(double fDistance) const

    {

        if(fDistance <= 0.0)

        {

            return 0.0;

        }

        const double fLength(getLength());

        if(fTools::moreOrEqual(fDistance, fLength))

        {

            return 1.0;

        }

        // fDistance is >= fLength. For fLength to be zero, then fDistance has

        // to be <= 0.0, but we return early in that case.

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

        // fDistance is in ]0.0 .. fLength[

        if(mnEdgeCount == 1)

        {

            // not a bezier, linear edge

            return fDistance / fLength;

        }

        // it is a bezier

        std::vector< double >::const_iterator aIter = std::lower_bound(maLengthArray.begin(), maLengthArray.end(), fDistance);

        const sal_uInt32 nIndex(aIter - maLengthArray.begin());

        const double fHighBound(maLengthArray[nIndex]);

        const double fLowBound(nIndex ?  maLengthArray[nIndex - 1] : 0.0);

        const double fLinearInterpolatedLength((fDistance - fLowBound) / (fHighBound - fLowBound));

        return (static_cast< double >(nIndex) + fLinearInterpolatedLength) / static_cast< double >(mnEdgeCount);

    }

} // end of namespace basegfx

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