/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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* 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
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*/
#include <basegfx/range/b2drange.hxx>
#include <basegfx/range/b2irange.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 emptiness 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;
}
} // end of namespace basegfx
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