# 透過 unity 拆圖

### 根據參考教學的輸出步驟

1. 匯入 plist 讀取工具
https://github.com/nekocode/Unity3D-TextureAtlasSlicer-Cocos2d-x

2. 將這段 script 放到 unity 專案內

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.IO;

public class AtlasTool : Editor {

	[MenuItem("Tools/Slice Atlas")]
	public static void SliceAtlas()
	{
		if(!Directory.Exists("atlasout"))
		{
			Directory.CreateDirectory ("atlasout");
		}
		var dir = new DirectoryInfo ("Assets/AtlasTool");
		var imgs = dir.GetFiles ("*.png");
		for (int i = 0; i < imgs.Length; i++) {
			DealPng (imgs[i]);
		}
	}

	public static void DealPng(FileInfo file)
	{
		var outdir = "atlasout/" + file.Name.Replace (".png", "");
		if(!Directory.Exists(outdir))
		{
			Directory.CreateDirectory (outdir);
		}
		string path = "Assets/AtlasTool/" + file.Name;
		var assets2 = AssetDatabase.LoadAllAssetsAtPath (path);
		for (int i = 0; i < assets2.Length; i++) {
			Debug.LogError (assets2[i]);
			if(assets2[i] is Sprite)
			{
				var sp = assets2 [i] as Sprite;
				Texture2D t2d = new Texture2D ((int)sp.rect.width, (int)sp.rect.height, TextureFormat.RGBA32, false);
				var aslasTexture = sp.texture;
				t2d.SetPixels (aslasTexture.GetPixels((int)sp.rect.x, (int)sp.rect.y, (int)sp.rect.width, (int)sp.rect.height));
				t2d.Apply ();
				File.WriteAllBytes (outdir +"/" +sp.name +".png", t2d.EncodeToPNG());
			}
		}
	}
}

3. 將 spritesheet 的 **png** 和 **plist** 檔案放到 **Asset/AtlasTool**

4. 設定圖片
* Texture Type -> Sprite (2D and UI)
* Sprite Mode -> Multiple
* Advanced -> 勾選 **Read/Write Enabled**
* Compression -> None
* 按下 Apply

5. 圖片右鍵 -> Slice Sprite Using Coscos2d-x Plist

6. 選圖片打開 Sprite Editor, 按 slice 自動切割圖片範圍, 再按 Apply 儲存

7. Tools -> Slice Atlas

8. 輸出圖片在 **Assets** 同層的 **atlasout** 資料夾

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### 疑難排解
* 輸出的碎檔, 檔名並非 plist 設定的名稱
:::success
先設定圖片成 sprite, 再按 **Slice Sprite Using Coscos2d-x Plist** 這樣才會沿用 plist 內設定的名稱
:::

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### 參考教學
* [利用UNITY切割图集](https://www.freesion.com/article/2032633991)

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###### tags: `教學`