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-rw-r--r-- | sd/source/ui/slidesorter/controller/SlsAnimationFunction.cxx | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/sd/source/ui/slidesorter/controller/SlsAnimationFunction.cxx b/sd/source/ui/slidesorter/controller/SlsAnimationFunction.cxx new file mode 100644 index 000000000..31978baf7 --- /dev/null +++ b/sd/source/ui/slidesorter/controller/SlsAnimationFunction.cxx @@ -0,0 +1,129 @@ +/* -*- 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: */ |