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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/curve/b2dbeziertools.hxx>
#include <basegfx/curve/b2dcubicbezier.hxx>
#include <algorithm>
namespace basegfx
{
B2DCubicBezierHelper::B2DCubicBezierHelper(const B2DCubicBezier& rBase, sal_uInt32 nDivisions)
: maLengthArray(),
mnEdgeCount(0)
{
const bool bIsBezier(rBase.isBezier());
if(bIsBezier)
{
// check nDivisions; at least one is needed, but also prevent too big values
if(nDivisions < 1)
{
nDivisions = 1;
}
else if(nDivisions > 1000)
{
nDivisions = 1000;
}
// set nEdgeCount
mnEdgeCount = nDivisions + 1;
// fill in maLengthArray
maLengthArray.clear();
maLengthArray.reserve(mnEdgeCount);
B2DPoint aCurrent(rBase.getStartPoint());
double fLength(0.0);
for(sal_uInt32 a(1);;)
{
const B2DPoint aNext(rBase.interpolatePoint(static_cast<double>(a) / static_cast<double>(mnEdgeCount)));
const B2DVector aEdge(aNext - aCurrent);
fLength += aEdge.getLength();
maLengthArray.push_back(fLength);
if(++a < mnEdgeCount)
{
aCurrent = aNext;
}
else
{
const B2DPoint& aLastNext(rBase.getEndPoint());
const B2DVector aLastEdge(aLastNext - aNext);
fLength += aLastEdge.getLength();
maLengthArray.push_back(fLength);
break;
}
}
}
else
{
maLengthArray.clear();
maLengthArray.push_back(rBase.getEdgeLength());
mnEdgeCount = 1;
}
}
double B2DCubicBezierHelper::distanceToRelative(double fDistance) const
{
if(fDistance <= 0.0)
{
return 0.0;
}
const double fLength(getLength());
if(fTools::moreOrEqual(fDistance, fLength))
{
return 1.0;
}
// fDistance is in ]0.0 .. fLength[
if(mnEdgeCount == 1)
{
// not a bezier, linear edge
return fDistance / fLength;
}
// it is a bezier
std::vector< double >::const_iterator aIter = std::lower_bound(maLengthArray.begin(), maLengthArray.end(), fDistance);
const sal_uInt32 nIndex(aIter - maLengthArray.begin());
const double fHighBound(maLengthArray[nIndex]);
const double fLowBound(nIndex ? maLengthArray[nIndex - 1] : 0.0);
const double fLinearInterpolatedLength((fDistance - fLowBound) / (fHighBound - fLowBound));
return (static_cast< double >(nIndex) + fLinearInterpolatedLength) / static_cast< double >(mnEdgeCount);
}
} // end of namespace basegfx
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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