using UnityEngine;
public class TankMovement : MonoBehaviour
{
public int m_PlayerNumber = 1; // Used to identify which tank belongs to which player. This is set by this tank's manager.
public float m_Speed = 12f; // How fast the tank moves forward and back.
public float m_TurnSpeed = 180f; // How fast the tank turns in degrees per second.
public AudioSource m_MovementAudio; // Reference to the audio source used to play engine sounds. NB: different to the shooting audio source.
public AudioClip m_EngineIdling; // Audio to play when the tank isn't moving.
public AudioClip m_EngineDriving; // Audio to play when the tank is moving.
public float m_PitchRange = 0.2f; // The amount by which the pitch of the engine noises can vary.
private string m_MovementAxisName; // The name of the input axis for moving forward and back.
private string m_TurnAxisName; // The name of the input axis for turning.
private Rigidbody m_Rigidbody; // Reference used to move the tank.
private float m_MovementInputValue; // The current value of the movement input.
private float m_TurnInputValue; // The current value of the turn input.
private float m_OriginalPitch; // The pitch of the audio source at the start of the scene.
private void Awake ()
{
m_Rigidbody = GetComponent<Rigidbody> ();
}
private void OnEnable ()
{
// When the tank is turned on, make sure it's not kinematic.
m_Rigidbody.isKinematic = false;
// Also reset the input values.
m_MovementInputValue = 0f;
m_TurnInputValue = 0f;
}
private void OnDisable ()
{
// When the tank is turned off, set it to kinematic so it stops moving.
m_Rigidbody.isKinematic = true;
}
private void Start ()
{
// The axes names are based on player number.
m_MovementAxisName = "Vertical" + m_PlayerNumber;
m_TurnAxisName = "Horizontal" + m_PlayerNumber;
// Store the original pitch of the audio source.
m_OriginalPitch = m_MovementAudio.pitch;
}
private void Update ()
{
// Store the value of both input axes.
m_MovementInputValue = Input.GetAxis (m_MovementAxisName);
m_TurnInputValue = Input.GetAxis (m_TurnAxisName);
EngineAudio ();
}
private void EngineAudio ()
{
// If there is no input (the tank is stationary)...
if (Mathf.Abs (m_MovementInputValue) < 0.1f && Mathf.Abs (m_TurnInputValue) < 0.1f)
{
// ... and if the audio source is currently playing the driving clip...
if (m_MovementAudio.clip == m_EngineDriving)
{
// ... change the clip to idling and play it.
m_MovementAudio.clip = m_EngineIdling;
m_MovementAudio.pitch = Random.Range (m_OriginalPitch - m_PitchRange, m_OriginalPitch + m_PitchRange);
m_MovementAudio.Play ();
}
}
else
{
// Otherwise if the tank is moving and if the idling clip is currently playing...
if (m_MovementAudio.clip == m_EngineIdling)
{
// ... change the clip to driving and play.
m_MovementAudio.clip = m_EngineDriving;
m_MovementAudio.pitch = Random.Range(m_OriginalPitch - m_PitchRange, m_OriginalPitch + m_PitchRange);
m_MovementAudio.Play();
}
}
}
private void FixedUpdate ()
{
// Adjust the rigidbodies position and orientation in FixedUpdate.
Move ();
Turn ();
}
private void Move ()
{
// Create a vector in the direction the tank is facing with a magnitude based on the input, speed and the time between frames.
Vector3 movement = transform.forward * m_MovementInputValue * m_Speed * Time.deltaTime;
// Apply this movement to the rigidbody's position.
m_Rigidbody.MovePosition(m_Rigidbody.position + movement);
}
private void Turn ()
{
// Determine the number of degrees to be turned based on the input, speed and time between frames.
float turn = m_TurnInputValue * m_TurnSpeed * Time.deltaTime;
// Make this into a rotation in the y axis.
Quaternion turnRotation = Quaternion.Euler (0f, turn, 0f);
// Apply this rotation to the rigidbody's rotation.
m_Rigidbody.MoveRotation (m_Rigidbody.rotation * turnRotation);
}
}
这是官方代码
m_MovementAxisName = "Vertical" + m_PlayerNumber;
m_TurnAxisName = "Horizontal" + m_PlayerNumber;
这一句怎么分析
不是GetAxis("Horizontal")吗
这个怎么也能那么用
还有最后一句
怎么用的是乘法，不是应该从初始位置旋转吗？旋转角度不是用的加法吗？
移动跟旋转的操作方式不一样？
