133 lines
3.5 KiB
C++
133 lines
3.5 KiB
C++
/* -*- 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: */
|