src/Environment/fgwind.cxx

   1 #include "fgwind.hxx"
   2 #include <math.h>
   3 #include <stdio.h>
   4
   5 FGWindModulator::FGWindModulator() :
   6         direction_offset_norm(0.0),
   7         magnitude_factor_norm(1.0)
   8 {
   9 }
  10
  11 FGWindModulator::~FGWindModulator()
  12 {
  13 }
  14
  15 FGBasicWindModulator::FGBasicWindModulator() :
  16         elapsed(0.0),
  17         direction_period(17),
  18         speed_period(1)
  19 {
  20 }
  21
  22 FGBasicWindModulator::~FGBasicWindModulator()
  23 {
  24 }
  25
  26 void FGBasicWindModulator::update( double dt)
  27 {
  28         elapsed += dt;
  29         double t = elapsed/direction_period;
  30
  31         direction_offset_norm = (sin(t)*sin(2*t)+sin(t/3)) / 1.75;
  32
  33         t = elapsed/speed_period;
  34         magnitude_factor_norm = sin(t)* sin(5*direction_offset_norm*direction_offset_norm);;
  35         magnitude_factor_norm = magnitude_factor_norm < 0 ? 0 : magnitude_factor_norm;
  36 }