pi_to_pi
κ°λ κ³μ°ν  λ νμ 
while(angle >= M_PI)
{
  angle -= 2.*M_PI;
  while(angle < -M_PI)
  angle += 2.*M_PI;
  return angle;
}
κ°λ κ³μ°ν  λ νμ 
while(angle >= M_PI)
{
  angle -= 2.*M_PI;
  while(angle < -M_PI)
  angle += 2.*M_PI;
  return angle;
}
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