# Unity基礎教學
## 基礎版面配置
以下皆以2by3來介紹(可從右上版面配置來更改)
1、 場景畫面
基礎操作(左鍵: 移動場景 右鍵: 轉動視角 右鍵+WASD 向那個方向前進)
2、 遊戲畫面
3、 場靜物件
4、 專案資料夾
5、 專案物件
6、 物件編輯器
## 物件移動
最陽春的物件控制方法，且不方便大量修改

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class player_move2 : MonoBehaviour
{
    // Update is called once per frame
    void Update()
    {
        if (Input.GetKey(KeyCode.W))
        #偵測輸入按鍵
        {
            gameObject.transform.position += new Vector3(0f, 0f, 0.5f);
            #物件Z軸增加0.5
        }
        if (Input.GetKey(KeyCode.S))
        {
            gameObject.transform.position += new Vector3(0f, 0f, -0.5f);
        }
        if (Input.GetKey(KeyCode.A))
        {
            gameObject.transform.position += new Vector3(-0.5f, 0f, 0f);
        }
        if (Input.GetKey(KeyCode.D))
        {
            gameObject.transform.position += new Vector3(0.5f, 0f, 0f);
        }
    }
}

利用Character Controller來進行控制

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class player_move : MonoBehaviour
{
    public CharacterController controller;
    #導入CharacterController 命名成controller

    public float player_speed = 5f; 
    #定義物件移動速度
    public float player_jumpSpeed = 3.5f;
    #定義物件跳躍速度
    public float player_gravity = -9.18f;
    #定義物件重力加速度

    Vector3 velocity;
    #定義一個向量速度

    // Update is called once per frame
    void Update()
    {
        if (controller.isGrounded && velocity.y < 0)
        #如果CharacterController偵測到物件在地上且沒有再向下掉了
        {
            velocity.y = 0f;
            #將Y軸速度設為0
        }

        float x = Input.GetAxis("Horizontal");
        #定義x是X軸上的變化量(初始按鍵是W、S和↑、↓)
        float z = Input.GetAxis("Vertical");
        #定義z是Z軸上的變化量

        Vector3 move = transform.right * x + transform.forward * z;

        if (controller.isGrounded)
        {
            if (Input.GetButtonDown("Jump"))
            {
                velocity.y = player_jumpSpeed;
            }
        }

        controller.Move(move * player_speed * Time.deltaTime);
        velocity.y += player_gravity * Time.deltaTime;
        controller.Move(velocity * Time.deltaTime);
    }
}

有關Time.deltaTime的說明可以<a href=https://youtu.be/a-w7w8x_moE/>看這裡</a>
## 鏡頭跟隨

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class player_look : MonoBehaviour
{
    public float player_sensitive = 100f;
    #定義鏡頭靈敏度
    public Transform player;
    導入玩家的位置轉變
    float xRotation = 0f;

    // Start is called before the first frame update
    void Start()
    {
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
        #將滑鼠設為不可視且鎖住位置
    }

    // Update is called once per frame
    void Update()
    {
        float mouseX = Input.GetAxis("Mouse X") * player_sensitive * Time.deltaTime;
        float mouseY = Input.GetAxis("Mouse Y") * player_sensitive * Time.deltaTime;

        xRotation -= mouseY;
        #將xRotation設為負的滑鼠Y軸變化量
        xRotation = Mathf.Clamp(xRotation, -90f, 90f);
        #控制Rotation會限制在90~-90度之間

        transform.localRotation = Quaternion.Euler(xRotation, 0f, 0f);
        #抵銷掉玩家自身X軸的旋轉量
        player.Rotate(Vector3.up * mouseX);
        #玩家轉向以自身Y軸乘以滑鼠X軸的變化量
    }
}

## 敵人控制

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;

public class armyControll : MonoBehaviour {
    public GameObject aimObject;
    #從整個遊戲場景中抓目標物件
    NavMeshAgent nav;
    #導入NavMeshAgent
	// Use this for initialization
	void Start () {
        nav = GetComponent<NavMeshAgent>();
        #導入NavMeshAgent
	}
	
	// Update is called once per frame
	void Update () {
        nav.SetDestination(aimObject.transform.position);
        #追蹤敵人
	}
}

選擇可以導航的場地
將Navigation Static打勾
接著Bake
## 敵人攻擊

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class armyAttack : MonoBehaviour {
    public GameObject player;
    public float attackDistance = 2f;
    public playerHP playerHP;

    public int damage;

	// Update is called once per frame
    void Update () {
        Vector3 distance = gameObject.transform.position - player.transform.position;
        #向量中的距離=物件位置-玩家位置
        float nowDistance = distance.magnitude;
        #將向量轉換成長度
        if(nowDistance <= attackDistance)
        {
            attack();
        }
    }

    void attack()
    {
        playerHP.hpDecrease(damage);
        #連接到玩家血量腳本裡面的hpDecrease函數，傳入damage
    }
}

## 玩家血量

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class playerHP : MonoBehaviour {

    public int MaxHealth = 100;
    public int playerhp;

    private float nextFire;
    public float delay;
    #受到傷害的間閣
	// Use this for initialization
    void Start () {
        nextFire = 0f;
        delay = 1f;

        playerhp = MaxHealth;
    }

    public void hpDecrease(int damage)
    {
        nextFire += delay;
        if(nextFire >= 60)
        {
            playerhp -= damage;
            nextFire = 0f;
        }
}

## UI介面
剛剛的程式已經可以改變玩家的血量了，但如果要讓玩家親自看到自己的血量就需要用到UI介面了!

可以將腳本改成這樣

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class player_HP : MonoBehaviour
{

    public int MaxHealth = 100;
    public int playerhp;

    private float nextFire;
    public float delay;

    public Text HP;
    // Use this for initialization
    void Start()
    {
        nextFire = 0f;
        delay = 1f;

        playerhp = MaxHealth;
    }

    public void hpDecrease(int damage)
    {
        nextFire += delay;
        if (nextFire >= 60)
        {
            playerhp -= damage;
            HP.gameObject.GetComponent<Text>().text = "" + playerhp;
            nextFire = 0f;
        }
    }
}

## 資源商店
選擇自己想要的套件後
左上Packages選擇My Assets，右下import套件