sd/source/ui/slidesorter/inc/controller/SlsAnimationFunction.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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   9  * This file incorporates work covered by the following license notice:
  10  *
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  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 #pragma once
  21
  22 #include <basegfx/point/b2dpoint.hxx>
  23
  24 #include <functional>
  25 #include <vector>
  26
  27
  28 namespace sd::slidesorter::controller {
  29
  30 class AnimationBezierFunction
  31 {
  32 public:
  33     /** Create a cubic bezier curve whose start and end points are given
  34         implicitly as P0=(0,0) and P3=(1,1).  The second control point is
  35         implicitly given as P2=(1-nY1,1-nX1).
  36     */
  37     AnimationBezierFunction (
  38         const double nX1,
  39         const double nY1);
  40
  41     ::basegfx::B2DPoint operator() (const double nT);
  42
  43 private:
  44     const double mnX1;
  45     const double mnY1;
  46     const double mnX2;
  47     const double mnY2;
  48
  49     static double EvaluateComponent (
  50         const double nT,
  51         const double nV1,
  52         const double nV2);
  53 };
  54
  55 /** Turn a parametric function into one whose y-Values depend on its
  56     x-Values.  Note a lot of interpolation takes place.  The resulting
  57     accuracy should be good enough for the purpose of acceleration
  58     function for animations.
  59 */
  60 class AnimationParametricFunction
  61 {
  62 public:
  63     typedef ::std::function<basegfx::B2DPoint (double)> ParametricFunction;
  64     AnimationParametricFunction (const ParametricFunction& rFunction);
  65
  66     double operator() (const double nX);
  67
  68 private:
  69     /** y-Values of the parametric function given to the constructor
  70         evaluated (and interpolated) for evenly spaced x-Values.
  71     */
  72     ::std::vector<double> maY;
  73 };
  74
  75 } // end of namespace ::sd::slidesorter::controller
  76
  77 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */