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

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
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  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include "controller/SlsAnimationFunction.hxx"
  21 #include "model/SlsPageDescriptor.hxx"
  22 #include "view/SlideSorterView.hxx"
  23
  24 #include <osl/diagnose.hxx>
  25 #include <rtl/math.hxx>
  26
  27 namespace sd { namespace slidesorter { namespace controller {
  28
  29 //===== AnimationBezierFunction ===============================================
  30
  31 AnimationBezierFunction::AnimationBezierFunction (
  32     const double nX1,
  33     const double nY1)
  34     : mnX1(nX1),
  35       mnY1(nY1),
  36       mnX2(1-nY1),
  37       mnY2(1-nX1)
  38 {
  39 }
  40
  41 ::basegfx::B2DPoint AnimationBezierFunction::operator() (const double nT)
  42 {
  43     return ::basegfx::B2DPoint(
  44         EvaluateComponent(nT, mnX1, mnX2),
  45         EvaluateComponent(nT, mnY1, mnY2));
  46 }
  47
  48 double AnimationBezierFunction::EvaluateComponent (
  49     const double nT,
  50     const double nV1,
  51     const double nV2)
  52 {
  53     const double nS (1-nT);
  54
  55     // While the control point values 1 and 2 are explicitly given the start
  56     // and end values are implicitly given.
  57     const double nV0 (0);
  58     const double nV3 (1);
  59
  60     const double nV01 (nS*nV0 + nT*nV1);
  61     const double nV12 (nS*nV1 + nT*nV2);
  62     const double nV23 (nS*nV2 + nT*nV3);
  63
  64     const double nV012 (nS*nV01 + nT*nV12);
  65     const double nV123 (nS*nV12 + nT*nV23);
  66
  67     const double nV0123 (nS*nV012 + nT*nV123);
  68
  69     return nV0123;
  70 }
  71
  72 //===== AnimationParametricFunction ===========================================
  73
  74 AnimationParametricFunction::AnimationParametricFunction (const ParametricFunction& rFunction)
  75     : maY()
  76 {
  77     const sal_Int32 nSampleCount (64);
  78
  79     // Sample the given parametric function.
  80     ::std::vector<basegfx::B2DPoint> aPoints;
  81     aPoints.reserve(nSampleCount);
  82     for (sal_Int32 nIndex=0; nIndex<nSampleCount; ++nIndex)
  83     {
  84         const double nT (nIndex/double(nSampleCount-1));
  85         aPoints.push_back(basegfx::B2DPoint(rFunction(nT)));
  86     }
  87
  88     // Interpolate at evenly spaced points.
  89     maY.clear();
  90     maY.reserve(nSampleCount);
  91     double nX0 (aPoints[0].getX());
  92     double nY0 (aPoints[0].getY());
  93     double nX1 (aPoints[1].getX());
  94     double nY1 (aPoints[1].getY());
  95     sal_Int32 nIndex (1);
  96     for (sal_Int32 nIndex2=0; nIndex2<nSampleCount; ++nIndex2)
  97     {
  98         const double nX (nIndex2 / double(nSampleCount-1));
  99         while (nX > nX1 && nIndex<nSampleCount)
 100         {
 101             nX0 = nX1;
 102             nY0 = nY1;
 103             nX1 = aPoints[nIndex].getX();
 104             nY1 = aPoints[nIndex].getY();
 105             ++nIndex;
 106         }
 107         const double nU ((nX-nX1) / (nX0 - nX1));
 108         const double nY (nY0*nU + nY1*(1-nU));
 109         maY.push_back(nY);
 110     }
 111 }
 112
 113 double AnimationParametricFunction::operator() (const double nX)
 114 {
 115     const sal_Int32 nIndex0 (static_cast<sal_Int32>(nX * maY.size()));
 116     const double nX0 (nIndex0 / double(maY.size()-1));
 117     const sal_uInt32 nIndex1 (nIndex0 + 1);
 118     const double nX1 (nIndex1 / double(maY.size()-1));
 119
 120     if (nIndex0<=0)
 121         return maY[0];
 122     else if (sal_uInt32(nIndex0)>=maY.size() || nIndex1>=maY.size())
 123         return maY[maY.size()-1];
 124
 125     const double nU ((nX-nX1) / (nX0 - nX1));
 126     return maY[nIndex0]*nU + maY[nIndex1]*(1-nU);
 127 }
 128
 129 } } } // end of namespace ::sd::slidesorter::controller
 130
 131 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */