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75 lines
1.9 KiB
75 lines
1.9 KiB
//
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// AttractorKernel.hpp
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// AwesomeAttractorND
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//
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// Created by Joshua Moerman on 11/4/11.
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// Copyright 2011 Vadovas. All rights reserved.
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//
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#ifndef AwesomeAttractorND_AttractorKernel_hpp
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#define AwesomeAttractorND_AttractorKernel_hpp
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#include "Vectors.hpp"
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class AttractorKernel {
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public:
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virtual void iterate(VectorIterator begin, VectorIterator end, VectorIterator begin2) = 0;
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};
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template <typename T>
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class StaticAttractorKernel : public AttractorKernel, public T {
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public:
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virtual void iterate(VectorIterator begin, VectorIterator end, VectorIterator begin2){
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while (begin != end) {
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T::calculate(*begin2, *begin);
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++begin;
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++begin2;
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}
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}
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};
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struct Unravel {
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Unravel()
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: parameters()
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{
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parameters[0] = 0.761090;
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parameters[1] = 1.426758;
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parameters[2] = 1.516635;
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parameters[3] = -0.02366;
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parameters[4] = 2.398894;
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parameters[5] = -0.32422;
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parameters[6] = -2.12839;
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}
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void calculate(VectorConstRef vectorOld, VectorRef vectorNew){
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vectorNew[0] = parameters[0]*(vectorOld[2] + parameters[1]);
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vectorNew[1] = parameters[2]*(vectorOld[0] + parameters[3]);
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vectorNew[2] = parameters[4]*(vectorOld[1] + parameters[5]);
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const double dist = vectorNew[0]*vectorNew[0] + vectorNew[1]*vectorNew[1] + vectorNew[2]*vectorNew[2];
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if(dist > parameters[6]*parameters[6]) {
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const double sqrtDist = std::sqrt(dist);
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const double p = 1.0 - parameters[6] * (static_cast<int>(sqrtDist / parameters[6]) + 1.0) / sqrtDist;
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vectorNew[0] *= p;
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vectorNew[1] *= p;
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vectorNew[2] *= p;
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}
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}
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protected:
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std::array<double, 7> parameters;
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static const size_t dimension = 3;
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};
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struct Lorenz {
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void calculate(VectorConstRef o, VectorRef n);
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};
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/*
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IDEA: explicitly instantiate StaticAttractorKernel<Unravel>, StaticAttractorKernel<Lorenz>, ...
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Thereby we have very little Unravel and Lorenz classes, which do only one thing.
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And an abstract base-class. And only iterate() is virtual, thus calculate() can be inlined!
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*/
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#endif
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