c# - 统一导入 WWW 后如何更改 Sprite 的每单位像素？

Question

我目前正在制作一个关卡编辑器，用户可以在其中从文件中导入图 block ，并且它目前可以正常工作，除了我希望每个导入的 Sprite 的每单位像素更改为 32

这是我的代码:

//Get tiles from file
         StreamReader reader = new StreamReader(Application.dataPath + "/../Maps/" + mapName + "/Tiles/tiles.txt");
         string line = reader.ReadLine ();

         while (!string.IsNullOrEmpty (line)) {
             string[] param = line.Split (',');
             foreach (TileTexture t in tileTextures) {
                 if (t.name == param [0]) {
                     Sprite sprite = Sprite.Create (t.texture, new Rect (0, 0, t.texture.width, t.texture.height), new Vector2 (0, 0));
                     sprite.pixelsPerUnit = 32;//THIS LINE DOESNT WORK, GIVES READONLY ERROR
                     Tile tile = new Tile (param[0], sprite, new Vector2(float.Parse(param[1]), float.Parse(param[2])));
                     tile.sprite.texture.filterMode = FilterMode.Point;
                     tiles.Add (tile);
                 }
             }

             line = reader.ReadLine ();
         }

Answer 1

查看函数Sprite.Create()我们看到函数签名是

public static Sprite Create(Texture2D texture, 
                            Rect rect, 
                            Vector2 pivot, 
                            float pixelsPerUnit = 100.0f, 
                            uint extrude = 0, 
                            SpriteMeshType meshType = SpriteMeshType.Tight, 
                            Vector4 border = Vector4.zero);

我们看到我们可以将 pixelsPerUnit 作为可选参数传递给函数。您只能在此处执行此操作，以后不能更改它，因为正如您所发现的，字段 pixelsPerUnit 是 readonly 字段(意味着它不能更改)。所以，你只需要在这里传入你的32f。正确的代码是

if (t.name == param [0]) {
                 Sprite sprite = Sprite.Create (t.texture, new Rect (0, 0, t.texture.width, t.texture.height), new Vector2 (0, 0), 32f);
                 Tile tile = new Tile (param[0], sprite, new Vector2(float.Parse(param[1]), float.Parse(param[2])));
                 tile.sprite.texture.filterMode = FilterMode.Point;
                 tiles.Add (tile);
             }