private void Calc(double trajTime)
{
trajectory.Calc(trajTime * speed, ref _pos_1, ref _rot_1);
_pos_2.x = cosr * _pos_1.x - sinr * _pos_1.y;
_pos_2.y = sinr * _pos_1.x + cosr * _pos_1.y;
_pos_2 += trajTranslation;
_rot_2 = _rot_1 + trajRotation;
bulletPosition = _pos_2;
bulletRotation = _rot_2;
}