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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 <sal/config.h>
#include <o3tl/safeint.hxx>
#include <controller/SlsAnimationFunction.hxx>
namespace sd::slidesorter::controller {
//===== AnimationBezierFunction ===============================================
AnimationBezierFunction::AnimationBezierFunction (
const double nX1,
const double nY1)
: mnX1(nX1),
mnY1(nY1),
mnX2(1-nY1),
mnY2(1-nX1)
{
}
::basegfx::B2DPoint AnimationBezierFunction::operator() (const double nT)
{
return ::basegfx::B2DPoint(
EvaluateComponent(nT, mnX1, mnX2),
EvaluateComponent(nT, mnY1, mnY2));
}
double AnimationBezierFunction::EvaluateComponent (
const double nT,
const double nV1,
const double nV2)
{
const double nS (1-nT);
// While the control point values 1 and 2 are explicitly given the start
// and end values are implicitly given.
const double nV0 (0);
const double nV3 (1);
const double nV01 (nS*nV0 + nT*nV1);
const double nV12 (nS*nV1 + nT*nV2);
const double nV23 (nS*nV2 + nT*nV3);
const double nV012 (nS*nV01 + nT*nV12);
const double nV123 (nS*nV12 + nT*nV23);
const double nV0123 (nS*nV012 + nT*nV123);
return nV0123;
}
//===== AnimationParametricFunction ===========================================
AnimationParametricFunction::AnimationParametricFunction (const ParametricFunction& rFunction)
{
const sal_Int32 nSampleCount (64);
// Sample the given parametric function.
::std::vector<basegfx::B2DPoint> aPoints;
aPoints.reserve(nSampleCount);
for (sal_Int32 nIndex=0; nIndex<nSampleCount; ++nIndex)
{
const double nT (nIndex/double(nSampleCount-1));
aPoints.emplace_back(rFunction(nT));
}
// Interpolate at evenly spaced points.
maY.clear();
maY.reserve(nSampleCount);
double nX0 (aPoints[0].getX());
double nY0 (aPoints[0].getY());
double nX1 (aPoints[1].getX());
double nY1 (aPoints[1].getY());
sal_Int32 nIndex (1);
for (sal_Int32 nIndex2=0; nIndex2<nSampleCount; ++nIndex2)
{
const double nX (nIndex2 / double(nSampleCount-1));
while (nX > nX1 && nIndex<nSampleCount)
{
nX0 = nX1;
nY0 = nY1;
nX1 = aPoints[nIndex].getX();
nY1 = aPoints[nIndex].getY();
++nIndex;
}
const double nU ((nX-nX1) / (nX0 - nX1));
const double nY (nY0*nU + nY1*(1-nU));
maY.push_back(nY);
}
}
double AnimationParametricFunction::operator() (const double nX)
{
const sal_Int32 nIndex0 (static_cast<sal_Int32>(nX * maY.size()));
const double nX0 (nIndex0 / double(maY.size()-1));
const sal_uInt32 nIndex1 (nIndex0 + 1);
const double nX1 (nIndex1 / double(maY.size()-1));
if (nIndex0<=0)
return maY[0];
else if (o3tl::make_unsigned(nIndex0)>=maY.size() || nIndex1>=maY.size())
return maY[maY.size()-1];
const double nU ((nX-nX1) / (nX0 - nX1));
return maY[nIndex0]*nU + maY[nIndex1]*(1-nU);
}
} // end of namespace ::sd::slidesorter::controller
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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