sd/source/ui/slidesorter/controller/SlsAnimationFunction.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <sal/config.h>
  21
  22 #include <o3tl/safeint.hxx>
  23
  24 #include <controller/SlsAnimationFunction.hxx>
  25
  26 namespace sd::slidesorter::controller {
  27
  28 //===== AnimationBezierFunction ===============================================
  29
  30 AnimationBezierFunction::AnimationBezierFunction (
  31     const double nX1,
  32     const double nY1)
  33     : mnX1(nX1),
  34       mnY1(nY1),
  35       mnX2(1-nY1),
  36       mnY2(1-nX1)
  37 {
  38 }
  39
  40 ::basegfx::B2DPoint AnimationBezierFunction::operator() (const double nT)
  41 {
  42     return ::basegfx::B2DPoint(
  43         EvaluateComponent(nT, mnX1, mnX2),
  44         EvaluateComponent(nT, mnY1, mnY2));
  45 }
  46
  47 double AnimationBezierFunction::EvaluateComponent (
  48     const double nT,
  49     const double nV1,
  50     const double nV2)
  51 {
  52     const double nS (1-nT);
  53
  54     // While the control point values 1 and 2 are explicitly given the start
  55     // and end values are implicitly given.
  56     const double nV0 (0);
  57     const double nV3 (1);
  58
  59     const double nV01 (nS*nV0 + nT*nV1);
  60     const double nV12 (nS*nV1 + nT*nV2);
  61     const double nV23 (nS*nV2 + nT*nV3);
  62
  63     const double nV012 (nS*nV01 + nT*nV12);
  64     const double nV123 (nS*nV12 + nT*nV23);
  65
  66     const double nV0123 (nS*nV012 + nT*nV123);
  67
  68     return nV0123;
  69 }
  70
  71 //===== AnimationParametricFunction ===========================================
  72
  73 AnimationParametricFunction::AnimationParametricFunction (const ParametricFunction& rFunction)
  74 {
  75     const sal_Int32 nSampleCount (64);
  76
  77     // Sample the given parametric function.
  78     ::std::vector<basegfx::B2DPoint> aPoints;
  79     aPoints.reserve(nSampleCount);
  80     for (sal_Int32 nIndex=0; nIndex<nSampleCount; ++nIndex)
  81     {
  82         const double nT (nIndex/double(nSampleCount-1));
  83         aPoints.emplace_back(rFunction(nT));
  84     }
  85
  86     // Interpolate at evenly spaced points.
  87     maY.clear();
  88     maY.reserve(nSampleCount);
  89     double nX0 (aPoints[0].getX());
  90     double nY0 (aPoints[0].getY());
  91     double nX1 (aPoints[1].getX());
  92     double nY1 (aPoints[1].getY());
  93     sal_Int32 nIndex (1);
  94     for (sal_Int32 nIndex2=0; nIndex2<nSampleCount; ++nIndex2)
  95     {
  96         const double nX (nIndex2 / double(nSampleCount-1));
  97         while (nX > nX1 && nIndex<nSampleCount)
  98         {
  99             nX0 = nX1;
 100             nY0 = nY1;
 101             nX1 = aPoints[nIndex].getX();
 102             nY1 = aPoints[nIndex].getY();
 103             ++nIndex;
 104         }
 105         const double nU ((nX-nX1) / (nX0 - nX1));
 106         const double nY (nY0*nU + nY1*(1-nU));
 107         maY.push_back(nY);
 108     }
 109 }
 110
 111 double AnimationParametricFunction::operator() (const double nX)
 112 {
 113     const sal_Int32 nIndex0 (static_cast<sal_Int32>(nX * maY.size()));
 114     const double nX0 (nIndex0 / double(maY.size()-1));
 115     const sal_uInt32 nIndex1 (nIndex0 + 1);
 116     const double nX1 (nIndex1 / double(maY.size()-1));
 117
 118     if (nIndex0<=0)
 119         return maY[0];
 120     else if (o3tl::make_unsigned(nIndex0)>=maY.size() || nIndex1>=maY.size())
 121         return maY[maY.size()-1];
 122
 123     const double nU ((nX-nX1) / (nX0 - nX1));
 124     return maY[nIndex0]*nU + maY[nIndex1]*(1-nU);
 125 }
 126
 127 } // end of namespace ::sd::slidesorter::controller
 128
 129 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */