5-11 Play Scale Animation When Getting Item

今天要介紹大家一個簡單的功能，就是當玩家獲取物品時，背包內的Item會有簡單的縮放動畫，這個設計是讓玩家能較清楚的看出取得物品的變化。

如下圖，剛取得物品的時候會較大。

然後物品會再慢慢縮減到正常大小。

這個功能不難，我們主要修改ItemUI.cs：

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using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI;   namespace RPG.Inventory{  public class ItemUI : MonoBehaviour{   public Item Item { get; set; }   public int Amount { get; set; }     [SerializeField] float smoothScaleMultiplier = 4f;   float targetScale = 1f;   Vector3 initialScale = new Vector3(1.4f, 1.4f, 1.4f);     void Update(){    // 獲取物品動畫    if (transform.localScale.x != targetScale) {     float scale = Mathf.Lerp (transform.localScale.x, targetScale, smoothScaleMultiplier*Time.deltaTime);     transform.localScale = new Vector3 (scale, scale, scale);     if (Mathf.Abs (transform.localScale.x - targetScale) < 0.01f) {      transform.localScale = new Vector3 (targetScale, targetScale, targetScale);     }    }   }     public void SetItem(Item item, int amount = 1){    transform.localScale = initialScale; // 獲取物品動畫的初始Scale    this.Item = item;    this.Amount = amount;    GetComponentInChildren<img> ().sprite = Resources.Load<sprite> (item.Sprite);    GetComponentInChildren<text> ().text = Amount.ToString();   }     public void AddAmount(int amount = 1){    transform.localScale = initialScale; // 獲取物品動畫的初始Scale    this.Amount += amount;    GetComponentInChildren<text> ().text = Amount.ToString();   }     public void SetAmount(int amount){    transform.localScale = initialScale; // 獲取物品動畫的初始Scale    this.Amount = amount;    GetComponentInChildren<text> ().text = Amount.ToString();   }     public void Show(){    gameObject.SetActive (true);   }     public void Hide(){    gameObject.SetActive (false);   }     public void SetLocalPosition(Vector3 localPosition){    transform.localPosition = localPosition;   }  } } </text></text></text></sprite>

然後，大家可以修改InventorySystem.cs，在Update中增加GetKeyDown事件，按下G鍵的時候會隨機產生一個物體，能夠方便大家觀察動畫的模樣。