151 lines
6.3 KiB
C++
151 lines
6.3 KiB
C++
/*************************************************************************
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* $RCSfile: b2xrange.cxx,v $
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*
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* $Revision: 1.3 $
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*
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* last change: $Author: obo $ $Date: 2006-09-17 08:05:10 $
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*
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* The Contents of this file are made available subject to
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* the terms of GNU Lesser General Public License Version 2.1.
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*
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*
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* GNU Lesser General Public License Version 2.1
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* =============================================
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* Copyright 2005 by Sun Microsystems, Inc.
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* 901 San Antonio Road, Palo Alto, CA 94303, USA
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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************************************************************************/
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// MARKER(update_precomp.py): autogen include statement, do not remove
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#include "precompiled_basegfx.hxx"
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#include <basegfx/range/b2drange.hxx>
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#include <basegfx/range/b2irange.hxx>
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#include <basegfx/range/b2ibox.hxx>
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namespace basegfx
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{
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namespace
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{
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/** Generic implementation of the difference set computation
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@tpl RangeType
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Type to operate on. Must provide ValueType and TraitsType
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nested types.
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*/
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template< class RangeType > void doComputeSetDifference(
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::std::vector< RangeType >& o_rRanges,
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const RangeType& a,
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const RangeType& b )
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{
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o_rRanges.clear();
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// special-casing the empty rect case (this will fail most
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// of the times below, because of the DBL_MIN/MAX special
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// values denoting emptyness in the rectangle.
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if( a.isEmpty() )
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{
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o_rRanges.push_back( b );
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return;
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}
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if( b.isEmpty() )
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{
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o_rRanges.push_back( a );
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return;
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}
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const typename RangeType::ValueType ax(a.getMinX());
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const typename RangeType::ValueType ay(a.getMinY());
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const typename RangeType::TraitsType::DifferenceType aw(a.getWidth());
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const typename RangeType::TraitsType::DifferenceType ah(a.getHeight());
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const typename RangeType::ValueType bx(b.getMinX());
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const typename RangeType::ValueType by(b.getMinY());
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const typename RangeType::TraitsType::DifferenceType bw(b.getWidth());
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const typename RangeType::TraitsType::DifferenceType bh(b.getHeight());
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const typename RangeType::TraitsType::DifferenceType h0( (by > ay) ? by - ay : 0 );
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const typename RangeType::TraitsType::DifferenceType h3( (by + bh < ay + ah) ? ay + ah - by - bh : 0 );
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const typename RangeType::TraitsType::DifferenceType w1( (bx > ax) ? bx - ax : 0 );
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const typename RangeType::TraitsType::DifferenceType w2( (ax + aw > bx + bw) ? ax + aw - bx - bw : 0 );
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const typename RangeType::TraitsType::DifferenceType h12( (h0 + h3 < ah) ? ah - h0 - h3 : 0 );
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// TODO(E2): Use numeric_cast instead of static_cast here,
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// need range checks!
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if (h0 > 0)
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o_rRanges.push_back(
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RangeType(ax,ay,
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static_cast<typename RangeType::ValueType>(ax+aw),
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static_cast<typename RangeType::ValueType>(ay+h0)) );
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if (w1 > 0 && h12 > 0)
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o_rRanges.push_back(
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RangeType(ax,
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static_cast<typename RangeType::ValueType>(ay+h0),
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static_cast<typename RangeType::ValueType>(ax+w1),
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static_cast<typename RangeType::ValueType>(ay+h0+h12)) );
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if (w2 > 0 && h12 > 0)
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o_rRanges.push_back(
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RangeType(static_cast<typename RangeType::ValueType>(bx+bw),
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static_cast<typename RangeType::ValueType>(ay+h0),
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static_cast<typename RangeType::ValueType>(bx+bw+w2),
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static_cast<typename RangeType::ValueType>(ay+h0+h12)) );
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if (h3 > 0)
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o_rRanges.push_back(
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RangeType(ax,
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static_cast<typename RangeType::ValueType>(ay+h0+h12),
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static_cast<typename RangeType::ValueType>(ax+aw),
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static_cast<typename RangeType::ValueType>(ay+h0+h12+h3)) );
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}
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}
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::std::vector< B2IRange >& computeSetDifference( ::std::vector< B2IRange >& o_rResult,
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const B2IRange& rFirst,
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const B2IRange& rSecond )
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{
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doComputeSetDifference( o_rResult, rFirst, rSecond );
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return o_rResult;
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}
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::std::vector< B2DRange >& computeSetDifference( ::std::vector< B2DRange >& o_rResult,
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const B2DRange& rFirst,
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const B2DRange& rSecond )
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{
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doComputeSetDifference( o_rResult, rFirst, rSecond );
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return o_rResult;
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}
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::std::vector< B2IBox >& computeSetDifference( ::std::vector< B2IBox >& o_rResult,
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const B2IBox& rFirst,
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const B2IBox& rSecond )
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{
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doComputeSetDifference( o_rResult, rFirst, rSecond );
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return o_rResult;
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}
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} // end of namespace basegfx
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// eof
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