// This file is a part of Framsticks SDK.  http://www.framsticks.com/
// Copyright (C) 1999-2015  Maciej Komosinski and Szymon Ulatowski.
// See LICENSE.txt for details.

#include "neuroimpl-simple.h"

#define NEURO_MAX 10.0
#define OVERLOAD 0.1
#define MUSCLESPEED   0.08
#define MUSCLEACC   0.01

int NI_StdNeuron::lateinit()
{
istate=newstate+neuro->state; // neuro->state -> random initialization
calcOutput();
neuro->state=newstate;
return 1;
}

void NI_StdNeuron::calcInternalState()
{
double sum=getWeightedInputSum();
velocity=force*(sum-istate)+inertia*velocity;
istate+=velocity;
if (istate>NEURO_MAX) istate=NEURO_MAX;
else if (istate<-NEURO_MAX) istate=-NEURO_MAX;
}

void NI_StdNeuron::go()
{
calcInternalState();
calcOutput();
}

void NI_StdNeuron::calcOutput()
{
double s=istate * sigmo;
if (s<-30.0) setState(-1);
else setState(2.0/(1.0+exp(-s))-1.0); // -1...1
}

void NI_StdUNeuron::calcOutput()
{
double s=istate * sigmo;
if (s<-30.0) setState(0);
else setState(1.0/(1.0+exp(-s))); // 0...1
}