5a6ed660ec
added some tooling to basegfx (cherry picked from commit 97fa4faaa0b09724cf98dbf22390b283ba57b41c) Conflicts: basegfx/inc/basegfx/numeric/ftools.hxx Change-Id: Ib15c43cf4d5b50605ec596dab498e3a678f3734a
106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <basegfx/numeric/ftools.hxx>
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#include <algorithm>
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namespace basegfx
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{
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// init static member of class fTools
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double ::basegfx::fTools::mfSmallValue = 0.000000001;
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double snapToNearestMultiple(double v, const double fStep)
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{
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if(fTools::equalZero(fStep))
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{
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// with a zero step, all snaps to 0.0
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return 0.0;
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}
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else
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{
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const double fHalfStep(fStep * 0.5);
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const double fChange(fHalfStep - fmod(v + fHalfStep, fStep));
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if(basegfx::fTools::equal(fabs(v), fabs(fChange)))
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{
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return 0.0;
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}
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else
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{
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return v + fChange;
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}
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}
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}
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double snapToZeroRange(double v, double fWidth)
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{
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if(fTools::equalZero(fWidth))
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{
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// with no range all snaps to range bound
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return 0.0;
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}
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else
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{
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if(v < 0.0 || v > fWidth)
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{
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double fRetval(fmod(v, fWidth));
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if(fRetval < 0.0)
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{
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fRetval += fWidth;
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}
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return fRetval;
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}
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else
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{
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return v;
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}
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}
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}
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double snapToRange(double v, double fLow, double fHigh)
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{
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if(fTools::equal(fLow, fHigh))
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{
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// with no range all snaps to range bound
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return 0.0;
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}
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else
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{
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if(fLow > fHigh)
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{
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// correct range order. Evtl. assert this (?)
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std::swap(fLow, fHigh);
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}
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if(v < fLow || v > fHigh)
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{
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return snapToZeroRange(v - fLow, fHigh - fLow) + fLow;
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}
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else
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{
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return v;
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}
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}
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}
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} // end of namespace basegfx
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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