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/*************************************************************************
 *
 *  OpenOffice.org - a multi-platform office productivity suite
 *
 *  $RCSfile: b2xrange.cxx,v $
 *
 *  $Revision: 1.2 $
 *
 *  last change: $Author: kz $ $Date: 2005-11-02 14:00:09 $
 *
 *  The Contents of this file are made available subject to
 *  the terms of GNU Lesser General Public License Version 2.1.
 *
 *
 *    GNU Lesser General Public License Version 2.1
 *    =============================================
 *    Copyright 2005 by Sun Microsystems, Inc.
 *    901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License version 2.1, as published by the Free Software Foundation.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *    MA  02111-1307  USA
 *
 ************************************************************************/

#include <basegfx/range/b2drange.hxx>
#include <basegfx/range/b2irange.hxx>
#include <basegfx/range/b2ibox.hxx>


namespace basegfx
{
    namespace
    {
        /** Generic implementation of the difference set computation

            @tpl RangeType
            Type to operate on. Must provide ValueType and TraitsType
            nested types.
         */
        template< class RangeType > void doComputeSetDifference(
            ::std::vector< RangeType >& o_rRanges,
            const RangeType&            a,
            const RangeType&            b )
        {
            o_rRanges.clear();

            // special-casing the empty rect case (this will fail most
            // of the times below, because of the DBL_MIN/MAX special
            // values denoting emptyness in the rectangle.
            if( a.isEmpty() )
            {
                o_rRanges.push_back( b );
                return;
            }
            if( b.isEmpty() )
            {
                o_rRanges.push_back( a );
                return;
            }

            const typename RangeType::ValueType                     ax(a.getMinX());
            const typename RangeType::ValueType                     ay(a.getMinY());
            const typename RangeType::TraitsType::DifferenceType    aw(a.getWidth());
            const typename RangeType::TraitsType::DifferenceType    ah(a.getHeight());
            const typename RangeType::ValueType                     bx(b.getMinX());
            const typename RangeType::ValueType                     by(b.getMinY());
            const typename RangeType::TraitsType::DifferenceType    bw(b.getWidth());
            const typename RangeType::TraitsType::DifferenceType    bh(b.getHeight());

            const typename RangeType::TraitsType::DifferenceType    h0( (by > ay) ? by - ay : 0 );
            const typename RangeType::TraitsType::DifferenceType    h3( (by + bh < ay + ah) ? ay + ah - by - bh : 0 );
            const typename RangeType::TraitsType::DifferenceType    w1( (bx > ax) ? bx - ax : 0 );
            const typename RangeType::TraitsType::DifferenceType    w2( (ax + aw > bx + bw) ? ax + aw - bx - bw : 0 );
            const typename RangeType::TraitsType::DifferenceType    h12( (h0 + h3 < ah) ? ah - h0 - h3 : 0 );

            // TODO(E2): Use numeric_cast instead of static_cast here,
            // need range checks!
            if (h0 > 0)
                o_rRanges.push_back(
                    RangeType(ax,ay,
                              static_cast<typename RangeType::ValueType>(ax+aw),
                              static_cast<typename RangeType::ValueType>(ay+h0)) );

            if (w1 > 0 && h12 > 0)
                o_rRanges.push_back(
                    RangeType(ax,
                              static_cast<typename RangeType::ValueType>(ay+h0),
                              static_cast<typename RangeType::ValueType>(ax+w1),
                              static_cast<typename RangeType::ValueType>(ay+h0+h12)) );

            if (w2 > 0 && h12 > 0)
                o_rRanges.push_back(
                    RangeType(static_cast<typename RangeType::ValueType>(bx+bw),
                              static_cast<typename RangeType::ValueType>(ay+h0),
                              static_cast<typename RangeType::ValueType>(bx+bw+w2),
                              static_cast<typename RangeType::ValueType>(ay+h0+h12)) );

            if (h3 > 0)
                o_rRanges.push_back(
                    RangeType(ax,
                              static_cast<typename RangeType::ValueType>(ay+h0+h12),
                              static_cast<typename RangeType::ValueType>(ax+aw),
                              static_cast<typename RangeType::ValueType>(ay+h0+h12+h3)) );
        }
    }

    ::std::vector< B2IRange >& computeSetDifference( ::std::vector< B2IRange >& o_rResult,
                                                     const B2IRange&            rFirst,
                                                     const B2IRange&            rSecond )
    {
        doComputeSetDifference( o_rResult, rFirst, rSecond );

        return o_rResult;
    }

    ::std::vector< B2DRange >& computeSetDifference( ::std::vector< B2DRange >& o_rResult,
                                                     const B2DRange&            rFirst,
                                                     const B2DRange&            rSecond )
    {
        doComputeSetDifference( o_rResult, rFirst, rSecond );

        return o_rResult;
    }

    ::std::vector< B2IBox >& computeSetDifference( ::std::vector< B2IBox >& o_rResult,
                                                   const B2IBox&            rFirst,
                                                   const B2IBox&            rSecond )
    {
        doComputeSetDifference( o_rResult, rFirst, rSecond );

        return o_rResult;
    }

} // end of namespace basegfx

// eof