/* -*- 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 <sal/config.h>

#include <vcl/lineinfo.hxx>

#include <vcl/outdev.hxx>

#include <gridmerg.hxx>

#define PAGEBREAK_LINE_DISTANCE_PIXEL 5

#define PAGEBREAK_LINE_DASH_LEN_PIXEL 5

#define PAGEBREAK_LINE_DASH_COUNT 1

ScGridMerger::ScGridMerger( OutputDevice* pOutDev, tools::Long nOnePixelX, tools::Long nOnePixelY )

    : pDev(pOutDev)

    , nOneX(nOnePixelX)

    , nOneY(nOnePixelY)

    , nFixStart(0)

    , nFixEnd(0)

    , nVarStart(0)

    , nVarDiff(0)

    , nCount(0)

    , bVertical(false)

{

    //  optimize (DrawGrid) only for pixel MapMode,

    //  to avoid rounding errors

    bOptimize = ( pDev->GetMapMode().GetMapUnit() == MapUnit::MapPixel );

}

ScGridMerger::~ScGridMerger()

{

    Flush();

}

void ScGridMerger::AddLine( tools::Long nStart, tools::Long nEnd, tools::Long nPos )

{

    if ( nCount )

    {

        //  not first line - test fix position

        //  more than one previous line - test distance

        if ( nStart != nFixStart || nEnd != nFixEnd )

        {

            if ( nCount == 1 && nPos == nVarStart &&

                    ( nStart == nFixEnd ||

                        nStart == nFixEnd + ( bVertical ? nOneY : nOneX ) ) )

            {

                //  additional optimization: extend connected lines

                //  keep nCount at 1

                nFixEnd = nEnd;

            }

            else

                Flush();

        }

        else if ( nCount == 1 )

        {

            nVarDiff = nPos - nVarStart;

            ++nCount;

        }

        else if ( nPos != nVarStart + nCount * nVarDiff )       //! keep VarEnd?

            Flush();

        else

            ++nCount;

    }

    if ( !nCount )

    {

        //  first line (or flushed above) - just store

        nFixStart = nStart;

        nFixEnd   = nEnd;

        nVarStart = nPos;

        nVarDiff  = 0;

        nCount    = 1;

    }

}

void ScGridMerger::AddHorLine(bool bWorksInPixels, tools::Long nX1, tools::Long nX2, tools::Long nY, bool bDashed)

{

    if ( bWorksInPixels )

    {

        Point aPoint(pDev->PixelToLogic(Point(nX1, nY)));

        nX1 = aPoint.X();

        nY = aPoint.Y();

        nX2 = pDev->PixelToLogic(Point(nX2, 0)).X();

    }

    if ( bDashed )

    {

        // If there are some unflushed lines they must be flushed since

        // new line is of different style

        if (bOptimize) {

            Flush();

            bVertical = false;

        }

        LineInfo aLineInfo(LineStyle::Dash, 1);

        aLineInfo.SetDashCount( PAGEBREAK_LINE_DASH_COUNT );

        // Calculating logic values of DashLen and Distance from fixed pixel values

        Size aDashDistanceLen( pDev->PixelToLogic( Size( PAGEBREAK_LINE_DISTANCE_PIXEL,

                                                         PAGEBREAK_LINE_DASH_LEN_PIXEL )));

        aLineInfo.SetDistance( aDashDistanceLen.Width() );

        aLineInfo.SetDashLen( aDashDistanceLen.Height() );

        pDev->DrawLine( Point( nX1, nY ), Point( nX2, nY ), aLineInfo );

    }

    else if ( bOptimize )

    {

        if ( bVertical )

        {

            Flush();

            bVertical = false;

        }

        AddLine( nX1, nX2, nY );

    }

    else

        pDev->DrawLine( Point( nX1, nY ), Point( nX2, nY ) );

}

void ScGridMerger::AddVerLine(bool bWorksInPixels, tools::Long nX, tools::Long nY1, tools::Long nY2, bool bDashed)

{

    if (bWorksInPixels)

    {

        Point aPoint(pDev->PixelToLogic(Point(nX, nY1)));

        nX = aPoint.X();

        nY1 = aPoint.Y();

        nY2 = pDev->PixelToLogic(Point(0, nY2)).Y();

    }

    if ( bDashed )

    {

        // If there are some unflushed lines they must be flushed since

        // new line is of different style

        if (bOptimize) {

            Flush();

            bVertical = false;

        }

        LineInfo aLineInfo(LineStyle::Dash, 1);

        aLineInfo.SetDashCount( PAGEBREAK_LINE_DASH_COUNT );

        // Calculating logic values of DashLen and Distance from fixed pixel values

        Size aDashDistanceLen( pDev->PixelToLogic( Size( PAGEBREAK_LINE_DISTANCE_PIXEL,

                                                         PAGEBREAK_LINE_DASH_LEN_PIXEL )));

        aLineInfo.SetDistance( aDashDistanceLen.Width() );

        aLineInfo.SetDashLen( aDashDistanceLen.Height() );

        pDev->DrawLine( Point( nX, nY1 ), Point( nX, nY2 ), aLineInfo);

    }

    else if ( bOptimize )

    {

        if ( !bVertical )

        {

            Flush();

            bVertical = true;

        }

        AddLine( nY1, nY2, nX );

    }

    else

        pDev->DrawLine( Point( nX, nY1 ), Point( nX, nY2 ) );

}

void ScGridMerger::Flush()

{

    if (!nCount)

        return;

    if (bVertical)

    {

        if ( nCount == 1 )

            pDev->DrawLine( Point( nVarStart, nFixStart ), Point( nVarStart, nFixEnd ) );

        else

        {

            tools::Long nVarEnd = nVarStart + ( nCount - 1 ) * nVarDiff;

            if ( nVarDiff < 0 )

            {

                //  nVarDiff is negative in RTL layout mode

                //  Change the positions so DrawGrid is called with a positive distance

                //  (nVarStart / nVarDiff can be modified, aren't used after Flush)

                nVarDiff = -nVarDiff;

                std::swap( nVarStart, nVarEnd );

            }

            pDev->DrawGrid( tools::Rectangle( nVarStart, nFixStart, nVarEnd, nFixEnd ),

                            Size( nVarDiff, nFixEnd - nFixStart ),

                            DrawGridFlags::VertLines );

        }

    }

    else

    {

        if ( nCount == 1 )

            pDev->DrawLine( Point( nFixStart, nVarStart ), Point( nFixEnd, nVarStart ) );

        else

        {

            tools::Long nVarEnd = nVarStart + ( nCount - 1 ) * nVarDiff;

            pDev->DrawGrid( tools::Rectangle( nFixStart, nVarStart, nFixEnd, nVarEnd ),

                            Size( nFixEnd - nFixStart, nVarDiff ),

                            DrawGridFlags::HorzLines );

        }

    }

    nCount = 0;

}

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