36 lines
719 B
C++
36 lines
719 B
C++
#include "fgwind.hxx"
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#include <math.h>
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#include <stdio.h>
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FGWindModulator::FGWindModulator() :
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direction_offset_norm(0.0),
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magnitude_factor_norm(1.0)
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{
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}
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FGWindModulator::~FGWindModulator()
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{
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}
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FGBasicWindModulator::FGBasicWindModulator() :
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elapsed(0.0),
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direction_period(17),
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speed_period(1)
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{
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}
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FGBasicWindModulator::~FGBasicWindModulator()
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{
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}
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void FGBasicWindModulator::update( double dt)
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{
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elapsed += dt;
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double t = elapsed/direction_period;
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direction_offset_norm = (sin(t)*sin(2*t)+sin(t/3)) / 1.75;
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t = elapsed/speed_period;
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magnitude_factor_norm = sin(t)* sin(5*direction_offset_norm*direction_offset_norm);;
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magnitude_factor_norm = magnitude_factor_norm < 0 ? 0 : magnitude_factor_norm;
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}
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