using System.Collections;  using System.Collections.Generic;  using UnityEngine;    public class PlayerControl : MonoBehaviour  {      private Rigidbody2D m_PlayerRb;// 人物刚体      private float m_FacingRight = 1;//角色是否面向右方      private float m_MoveInputDirection;//方向输入      public float m_MoveSpeed;//移动速度      private Vector3 m_Velocity = Vector3.zero;      private float m_MovementSmoothing = .05f;//移动平滑速度        public Transform m_GroundCheck;//地面检查      public bool m_Grounded=true;//是否站在地面上主要用于跳跃是判断      public float m_JumpForce = 15f;//跳跃力量      public float groundCheckRadius = 0.2f;//地面检测半径      public LayerMask m_WhatisGround;//检测碰撞的层        [SerializeField]private float jumpFactor;      private void Awake()      {          m_PlayerRb = GetComponent<Rigidbody2D>();//获取角色刚体      }      private void Update()      {          //获取角色图片大小sp.bounds.extents.y          m_Grounded = Physics2D.OverlapCircle(m_GroundCheck.position, groundCheckRadius, m_WhatisGround);          Vector3 m_mousePostion = Input.mousePosition;//获取鼠标位置          m_mousePostion = Camera.main.ScreenToWorldPoint(m_mousePostion);//转换成世界坐标          // 因为是2D，用不到z轴。使将z轴的值为0，这样鼠标的坐标就在(x,y)平面上了          m_mousePostion.z = 0;          //根据鼠标位置翻转角色          if (m_mousePostion.x-transform.position.x < 0 && m_FacingRight == 1)          {              Flip();          }          else if (m_mousePostion.x - transform.position.x > 0 && m_FacingRight == -1)          {              Flip();          }            #region 左右移动相关          //获取键盘输入，表示左右输入 按键A或D或向左箭头向右箭头          m_MoveInputDirection = Input.GetAxisRaw("Horizontal");          #endregion          #region 跳跃相关          //判断是否按下跳跃键，并角色在地面上          if (Input.GetButtonDown("Jump")&&m_Grounded)          {              m_Grounded = false;//跳跃后，是否在地面为否              m_PlayerRb.velocity = Vector2.up * m_JumpForce;//角色向上跳跃          }          BetterJump();          #endregion      }      private void FixedUpdate()      {          if (m_MoveInputDirection!=0)//表示玩家按下了左右方向键          {              //移动角色              Vector3 targetVelocity = new Vector2(m_MoveSpeed * m_MoveInputDirection, m_PlayerRb.velocity.y);              m_PlayerRb.velocity = Vector3.SmoothDamp(m_PlayerRb.velocity, targetVelocity, ref m_Velocity, m_MovementSmoothing);          }      }      /// <summary>      /// 角色翻转      /// </summary>      void Flip()      {          m_FacingRight *= -1;          transform.Rotate(0.0f, 180.0f, 0.0f);      }        /// <summary>      /// 角色跳跃，长按高跳，短按低跳      /// </summary>      private void BetterJump()      {          //角色跳起后下落阶段          if (m_PlayerRb.velocity.y<0)          {              m_PlayerRb.velocity += Vector2.up * Physics2D.gravity.y * jumpFactor*Time.deltaTime;//不停的增加重力，手感更强使游戏更有可玩性          }          else if (m_PlayerRb.velocity.y>0&&!Input.GetButton("Jump"))//角色跳起阶段，并放弃按跳跃键          {              m_PlayerRb.velocity += Vector2.up * Physics2D.gravity.y * jumpFactor * Time.deltaTime;          }      }        private void OnDrawGizmos()      {          //地面检测方法划线显示，便于观察          Gizmos.color = Color.red;          Gizmos.DrawWireSphere(m_GroundCheck.position, groundCheckRadius);        }    }