/* -*- 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 <PolarLabelPositionHelper.hxx>

#include <PlottingPositionHelper.hxx>

#include <basegfx/vector/b2dvector.hxx>

#include <basegfx/vector/b2ivector.hxx>

#include <com/sun/star/chart/DataLabelPlacement.hpp>

namespace chart

{

using namespace ::com::sun::star;

PolarLabelPositionHelper::PolarLabelPositionHelper(

                    PolarPlottingPositionHelper* pPosHelper

                    , sal_Int32 nDimensionCount

                    , const rtl::Reference<SvxShapeGroupAnyD>& xLogicTarget )

                    : LabelPositionHelper( nDimensionCount, xLogicTarget )

                    , m_pPosHelper(pPosHelper)

{

}

PolarLabelPositionHelper::~PolarLabelPositionHelper()

{

}

awt::Point PolarLabelPositionHelper::getLabelScreenPositionAndAlignmentForLogicValues(

        LabelAlignment& rAlignment

        , double fLogicValueOnAngleAxis

        , double fLogicValueOnRadiusAxis

        , double fLogicZ

        , sal_Int32 nScreenValueOffsetInRadiusDirection ) const

{

    double fUnitCircleAngleDegree = m_pPosHelper->transformToAngleDegree( fLogicValueOnAngleAxis );

    double fUnitCircleRadius = m_pPosHelper->transformToRadius( fLogicValueOnRadiusAxis );

    return getLabelScreenPositionAndAlignmentForUnitCircleValues(

           rAlignment, css::chart::DataLabelPlacement::OUTSIDE

           , fUnitCircleAngleDegree, 0.0

           , fUnitCircleRadius, fUnitCircleRadius, fLogicZ, nScreenValueOffsetInRadiusDirection );

}

awt::Point PolarLabelPositionHelper::getLabelScreenPositionAndAlignmentForUnitCircleValues(

        LabelAlignment& rAlignment, sal_Int32 nLabelPlacement

        , double fUnitCircleStartAngleDegree, double fUnitCircleWidthAngleDegree

        , double fUnitCircleInnerRadius, double fUnitCircleOuterRadius

        , double fLogicZ

        , sal_Int32 nScreenValueOffsetInRadiusDirection

        , const ::basegfx::B3DVector& aOffset) const

{

    bool bCenter = (nLabelPlacement != css::chart::DataLabelPlacement::OUTSIDE)

                && (nLabelPlacement != css::chart::DataLabelPlacement::INSIDE);

    double fAngleDegree = fUnitCircleStartAngleDegree + fUnitCircleWidthAngleDegree/2.0;

    double fRadius = 0.0;

    if( !bCenter ) //e.g. for pure pie chart(one ring only) or for angle axis of polar coordinate system

        fRadius = fUnitCircleOuterRadius;

    else

        fRadius = fUnitCircleInnerRadius + (fUnitCircleOuterRadius-fUnitCircleInnerRadius)/2.0 ;

    awt::Point aRet( transformSceneToScreenPosition(

        m_pPosHelper->transformUnitCircleToScene( fAngleDegree, fRadius,

            fLogicZ+0.5, aOffset ) ) );

    if(m_nDimensionCount==3 && nLabelPlacement == css::chart::DataLabelPlacement::OUTSIDE)

    {

        //check whether the upper or the downer edge is more distant from the center

        //take the farthest point to put the label to

        awt::Point aP0( transformSceneToScreenPosition(

            m_pPosHelper->transformUnitCircleToScene( 0, 0, fLogicZ, aOffset ) ) );

        awt::Point aP1(aRet);

        awt::Point aP2( transformSceneToScreenPosition(

            m_pPosHelper->transformUnitCircleToScene( fAngleDegree, fRadius,

                fLogicZ-0.5, aOffset ) ) );

        ::basegfx::B2DVector aV0( aP0.X, aP0.Y );

        ::basegfx::B2DVector aV1( aP1.X, aP1.Y );

        ::basegfx::B2DVector aV2( aP2.X, aP2.Y );

        double fL1 = ::basegfx::B2DVector(aV1-aV0).getLength();

        double fL2 = ::basegfx::B2DVector(aV2-aV0).getLength();

        if(fL2>fL1)

            aRet = aP2;

        //calculate new angle for alignment

        double fDX = aRet.X-aP0.X;

        double fDY = aRet.Y-aP0.Y;

        fDY*=-1.0;//drawing layer has inverse y values

        fAngleDegree = basegfx::rad2deg(atan2(fDY,fDX));

    }

    //set LabelAlignment

    if( !bCenter )

    {

        // tdf#123504: both 0 and 360 are valid and different values here!

        while (fAngleDegree > 360.0)

            fAngleDegree -= 360.0;

        while (fAngleDegree < 0.0)

            fAngleDegree += 360.0;

        bool bOutside = nLabelPlacement == css::chart::DataLabelPlacement::OUTSIDE;

        if (fAngleDegree <= 5 || fAngleDegree >= 355)

            rAlignment = bOutside ? LABEL_ALIGN_RIGHT : LABEL_ALIGN_LEFT;

        else if (fAngleDegree < 85)

            rAlignment = bOutside ? LABEL_ALIGN_RIGHT_TOP : LABEL_ALIGN_LEFT_BOTTOM;

        else if (fAngleDegree <= 95)

            rAlignment = bOutside ? LABEL_ALIGN_TOP : LABEL_ALIGN_BOTTOM;

        else if (fAngleDegree < 175)

            rAlignment = bOutside ? LABEL_ALIGN_LEFT_TOP : LABEL_ALIGN_RIGHT_BOTTOM;

        else if (fAngleDegree <= 185)

            rAlignment = bOutside ? LABEL_ALIGN_LEFT : LABEL_ALIGN_RIGHT;

        else if (fAngleDegree < 265)

            rAlignment = bOutside ? LABEL_ALIGN_LEFT_BOTTOM : LABEL_ALIGN_RIGHT_TOP;

        else if (fAngleDegree <= 275)

            rAlignment = bOutside ? LABEL_ALIGN_BOTTOM : LABEL_ALIGN_TOP;

        else

            rAlignment = bOutside ? LABEL_ALIGN_RIGHT_BOTTOM : LABEL_ALIGN_LEFT_TOP;

    }

    else

    {

        rAlignment = LABEL_ALIGN_CENTER;

    }

    //add a scaling independent Offset if requested

    if( nScreenValueOffsetInRadiusDirection != 0)

    {

        awt::Point aOrigin( transformSceneToScreenPosition(

            m_pPosHelper->transformUnitCircleToScene( 0.0, 0.0, fLogicZ+0.5,

                aOffset ) ) );

        basegfx::B2IVector aDirection( aRet.X- aOrigin.X, aRet.Y- aOrigin.Y );

        aDirection.setLength(nScreenValueOffsetInRadiusDirection);

        aRet.X += aDirection.getX();

        aRet.Y += aDirection.getY();

    }

    return aRet;

}

} //namespace chart

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