// prg6-3 角色動畫速度控制
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour
{
    // Start is called before the first frame update
    Rigidbody2D rigid2D;
    Animator animator;
    float jumpForce = 680.0f;
    float walkForce = 30.0f;
    float maxWalkSpeed = 2.0f;
    void Start()
    {
        this.rigid2D = GetComponent<Rigidbody2D>();
        this.animator = GetComponent<Animator>();
    }

    // Update is called once per frame
    void Update()
    {
    // Jump
    if(Input.GetKeyDown(KeyCode.Space)) {
        this.rigid2D.AddForce(transform.up * this.jumpForce);
    }  
    
    // 左右移動
    int key = 0;
    if(Input.GetKey(KeyCode.RightArrow)) key = 1;
    if(Input.GetKey(KeyCode.LeftArrow))  key = -1;

    //遊戲角色速度
    float speedx = Mathf.Abs(this.rigid2D.velocity.x);

    // 速度限制
    if(speedx < this.maxWalkSpeed) {
        this.rigid2D.AddForce(transform.right * key * this.walkForce);
    }

    // 依照行進方向進行翻轉
    if (key != 0) {
        transform.localScale = new Vector3(key,1,1);
    }

    // 依照遊戲角色的速度改變動畫的速度
    this.animator.speed = speedx / 2.0f;
    }
}