<1>非指向性技能，直线施法，这种施法涉及技能长度，人物转身，伤害计算三个关键点。
根据蓄力时间来显示辅助箭头长度，并且箭头长度和发射力度都有一个最大值。
先在人物下面创建slider
编写脚本
这里我为了方便直接通过public方式取得实例，不推荐大家这样做，而是统一transform.Find和GameObject.Find。
public GameObject skill1;//技能游戏物体
public GameObject SKILL1;//摇杆
public Slider Skill1Slider;//技能指示条
private float offset;//用来记录摇杆与摇杆背景偏移角度（new Vector 3（0,1,0））
public Rigidbody m_Shell; // Prefab of the shell.#炮弹刚体（有丶奇怪）
public Transform m_FireTransform; // A child of the tank where the shells are spawned.#坦克身上发射炮弹的部
public AudioSource m_ShootingAudio; // Reference to the audio source used to play the shooting audio. NB: different to the movement audio source.#炮弹发射声
public AudioClip m_ChargingClip; // Audio that plays when each shot is charging up.#当炮弹装载好播放的声音
public AudioClip m_FireClip; // Audio that plays when each shot is fired.#当炮弹发射时的声音
public float m_MinLaunchForce = 15f; // The force given to the shell if the fire button is not held.#最小发射力，即使开火键只按了一下就立即松开
public float m_MaxLaunchForce = 30f; // The force given to the shell if the fire button is held for the max charge time.#最大发射力
public float m_MaxChargeTime = 0.75f; // How long the shell can charge for before it is fired at max force.#炮弹最长需要多长时间才能装填完毕
private float m_CurrentLaunchForce; // The force that will be given to the shell when the fire button is released.#将会在开火后作用在炮弹上的力
private float m_ChargeSpeed; // How fast the launch force increases, based on the max charge time.#炮弹的速度，取决于蓄力时间
private float timeVal=0.0f; //用来优化炮弹发射时的时间标志初始化数值,把技能施法辅助隐藏
private void OnEnable()
{
// When the tank is turned on, reset the launch force and the UI#初始化坦克数据和UI
m_CurrentLaunchForce = m_MinLaunchForce;
Skill1Slider.value = m_MinLaunchForce;
m_ChargeSpeed = (m_MaxLaunchForce - m_MinLaunchForce) / m_MaxChargeTime;
skill1.SetActive(false);
}开火函数
private void Fire ()
{
timeVal = 0.0f;//重置时间标志
// Create an instance of the shell and store a reference to it's rigidbody.//实例化炮弹
Rigidbody shellInstance =
Instantiate (m_Shell, m_FireTransform.position, m_FireTransform.rotation) as Rigidbody;
// Set the shell's velocity to the launch force in the fire position's forward direction.//设置炮弹速度
shellInstance.velocity = m_CurrentLaunchForce * m_FireTransform.forward;
// Change the clip to the firing clip and play it.//播放发射炮弹声音
m_ShootingAudio.clip = m_FireClip;
m_ShootingAudio.Play ();
// Reset the launch force. This is a precaution in case of missing button events.//重置发射力
m_CurrentLaunchForce = m_MinLaunchForce;
}技能一的事件三个函数，按下时使技能辅助显示，移动时，更新箭头状态。抬起时，人物转身，隐藏技能辅助并发射炮弹。
（注意其中的摇杆角度和箭头角度的转化）
我们注意到摇杆是可以看做二维的，我们以Y轴为基准
而玩家旋转也是以Y轴为基准旋转
所以就有以下逻辑
public void OnSkill1Down()
{
skill1.SetActive(true);
m_CurrentLaunchForce = m_MinLaunchForce;
m_ShootingAudio.clip = m_ChargingClip;
}
public void OnSkill1Pressed()
{
timeVal += Time.deltaTime;
if (timeVal >= 0.1f)//蓄力时间大于0.1的时候才播放声音
{
m_ShootingAudio.Play();
timeVal = -10.0f;
}
// Increment the launch force and update the slider.#增加发射力，并且更新辅助箭头状态
if(m_CurrentLaunchForce<m_MaxLaunchForce)
m_CurrentLaunchForce += m_ChargeSpeed * Time.deltaTime;
Skill1Slider.value = m_CurrentLaunchForce;
offset = Vector3.Angle(SKILL1.transform.localPosition, new Vector3(0, 1, 0));
if (SKILL1.transform.localPosition.x < 0)
{
offset = -offset;
}
}
public void OnSkill1Up()
{
skill1.SetActive(false);
transform.rotation = Quaternion.AngleAxis(offset, new Vector3(0, 1, 0));//绕Y轴旋转offset度，达到同步效果
Fire();
}注册事件
