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/* -*- 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 .
*/
#pragma once
#include <sal/types.h>
#include <float.h>
#include <basegfx/numeric/ftools.hxx>
namespace basegfx
{
template< typename T, typename Traits > class BasicRange
{
protected:
T mnMinimum;
T mnMaximum;
public:
typedef T ValueType;
typedef Traits TraitsType;
BasicRange() :
mnMinimum(Traits::maxVal()),
mnMaximum(Traits::minVal())
{
}
explicit BasicRange( T nValue ) :
mnMinimum(nValue),
mnMaximum(nValue)
{
}
void reset()
{
mnMinimum = Traits::maxVal();
mnMaximum = Traits::minVal();
}
bool isEmpty() const
{
return Traits::maxVal() == mnMinimum;
}
T getMinimum() const { return mnMinimum; }
T getMaximum() const { return mnMaximum; }
double getCenter() const
{
if(isEmpty())
{
return 0.0;
}
else
{
return ((mnMaximum + mnMinimum) / 2.0);
}
}
bool isInside(T nValue) const
{
if(isEmpty())
{
return false;
}
else
{
return (nValue >= mnMinimum) && (nValue <= mnMaximum);
}
}
bool isInside(const BasicRange& rRange) const
{
if(isEmpty())
{
return false;
}
else
{
if(rRange.isEmpty())
{
return false;
}
else
{
return (rRange.mnMinimum >= mnMinimum) && (rRange.mnMaximum <= mnMaximum);
}
}
}
bool overlaps(const BasicRange& rRange) const
{
if(isEmpty())
{
return false;
}
else
{
if(rRange.isEmpty())
{
return false;
}
else
{
return (rRange.mnMaximum >= mnMinimum) && (rRange.mnMinimum <= mnMaximum);
}
}
}
bool overlapsMore(const BasicRange& rRange) const
{
if(isEmpty() || rRange.isEmpty())
return false;
// returns true if the overlap is more than just a touching at the limits
return ((rRange.mnMaximum > mnMinimum) && (rRange.mnMinimum < mnMaximum));
}
bool operator==( const BasicRange& rRange ) const
{
return (mnMinimum == rRange.mnMinimum && mnMaximum == rRange.mnMaximum);
}
bool operator!=( const BasicRange& rRange ) const
{
return (mnMinimum != rRange.mnMinimum || mnMaximum != rRange.mnMaximum);
}
bool equal(const BasicRange& rRange) const
{
return (
fTools::equal(mnMinimum, rRange.mnMinimum) &&
fTools::equal(mnMaximum, rRange.mnMaximum));
}
void expand(T nValue)
{
if(isEmpty())
{
mnMinimum = mnMaximum = nValue;
}
else
{
// Silence over-eager warning emitted at least by GCC 4.9.2 in certain
// instantiations:
#if defined __GNUC__ && !defined __clang__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstrict-overflow"
#endif
if(nValue < mnMinimum)
#if defined __GNUC__ && !defined __clang__
#pragma GCC diagnostic pop
#endif
{
mnMinimum = nValue;
}
if(nValue > mnMaximum)
{
mnMaximum = nValue;
}
}
}
void expand(const BasicRange& rRange)
{
if(isEmpty())
{
mnMinimum = rRange.mnMinimum;
mnMaximum = rRange.mnMaximum;
}
else
{
if(!rRange.isEmpty())
{
if(rRange.mnMinimum < mnMinimum)
{
mnMinimum = rRange.mnMinimum;
}
if(rRange.mnMaximum > mnMaximum)
{
mnMaximum = rRange.mnMaximum;
}
}
}
}
void intersect(const BasicRange& rRange)
{
// here, overlaps also tests all isEmpty() conditions already.
if( !overlaps( rRange ) )
{
reset();
}
else
{
if(rRange.mnMinimum > mnMinimum)
{
mnMinimum = rRange.mnMinimum;
}
if(rRange.mnMaximum < mnMaximum)
{
mnMaximum = rRange.mnMaximum;
}
}
}
void grow(T nValue)
{
if(isEmpty())
return;
bool bLessThanZero(nValue < 0);
if(nValue > 0 || bLessThanZero)
{
mnMinimum -= nValue;
mnMaximum += nValue;
if(bLessThanZero)
{
// test if range did collapse
if(mnMinimum > mnMaximum)
{
// if yes, collapse to center
mnMinimum = mnMaximum = (mnMinimum + mnMaximum) / 2;
}
}
}
}
T clamp(T nValue) const
{
if(isEmpty())
{
return nValue;
}
else
{
if(nValue < mnMinimum)
{
return mnMinimum;
}
if(nValue > mnMaximum)
{
return mnMaximum;
}
return nValue;
}
}
#if defined _MSC_VER && defined(_M_ARM64)
#pragma warning(push)
#pragma warning(disable: 4723) /* ignore: warning for C4723 on windows arm64 build */
#endif
typename Traits::DifferenceType getRange() const
{
if(isEmpty())
{
return Traits::neutral();
}
else
{
return (mnMaximum - mnMinimum);
}
}
#if defined _MSC_VER && defined(_M_ARM64)
#pragma warning( pop )
#endif
};
// some pre-fabricated traits
struct DoubleTraits
{
static constexpr double minVal() { return DBL_MIN; };
static constexpr double maxVal() { return DBL_MAX; };
static constexpr double neutral() { return 0.0; };
typedef double DifferenceType;
};
struct Int32Traits
{
static constexpr sal_Int32 minVal() { return SAL_MIN_INT32; };
static constexpr sal_Int32 maxVal() { return SAL_MAX_INT32; };
static constexpr sal_Int32 neutral() { return 0; };
typedef sal_Int64 DifferenceType;
};
} // end of namespace basegfx
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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