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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 .
*/
#include <basegfx/numeric/ftools.hxx>
namespace basegfx
{
double snapToNearestMultiple(double v, const double fStep)
{
if(fTools::equalZero(fStep))
{
// with a zero step, all snaps to 0.0
return 0.0;
}
else
{
const double fHalfStep(fStep * 0.5);
const double fChange(fHalfStep - fmod(v + fHalfStep, fStep));
if(basegfx::fTools::equal(fabs(v), fabs(fChange)))
{
return 0.0;
}
else
{
return v + fChange;
}
}
}
double snapToZeroRange(double v, double fWidth)
{
if(fTools::equalZero(fWidth))
{
// with no range all snaps to range bound
return 0.0;
}
else
{
if(v < 0.0 || v > fWidth)
{
double fRetval(fmod(v, fWidth));
if(fRetval < 0.0)
{
fRetval += fWidth;
}
return fRetval;
}
else
{
return v;
}
}
}
double snapToRange(double v, double fLow, double fHigh)
{
if(fTools::equal(fLow, fHigh))
{
// with no range all snaps to range bound
return 0.0;
}
else
{
if(fLow > fHigh)
{
// correct range order. Evtl. assert this (?)
std::swap(fLow, fHigh);
}
if(v < fLow || v > fHigh)
{
return snapToZeroRange(v - fLow, fHigh - fLow) + fLow;
}
else
{
return v;
}
}
}
double normalizeToRange(double v, const double fRange)
{
if(fRange <= 0.0)
{
// with a zero (or less) range, all normalizes to 0.0
return 0.0;
}
if(v < 0.0)
{
if(fTools::moreOrEqual(v, -fRange))
{
// in range [-fRange, 0.0[, shift one step
return v + fRange;
}
// re-calculate
return v - (floor(v/fRange)*fRange);
}
else
{
if(fTools::less(v, fRange))
{
// already in range [0.0, fRange[, nothing to do
return v;
}
// re-calculate
return v - (floor(v/fRange)*fRange);
}
}
} // end of namespace basegfx
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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