摄像机系统，和子对象绑定

examples/square/scenes/square.json

@@ -1,21 +1,31 @@
 {
-  "actors": [
-    {
-      "name": "square",
-      "init": "square_init",
-      "tick": "square_tick",
-      "position": {
-        "x": 0,
-        "y": 0
-      },
-      "facing": {
-        "x": 1,
-        "y": 0
-      },
-      "mesh": {
-        "shape": "quad",
-        "texture": "Dank.png"
-      }
-    }
-  ]
+    "default_camera": "square_camera",
+    "grid_background": true,
+    "actors": [
+        {
+            "name": "square",
+            "init": "square_init",
+            "tick": "square_tick",
+            "position": {
+                "x": 0,
+                "y": 0
+            },
+            "facing": {
+                "x": 1,
+                "y": 0
+            },
+            "mesh": {
+                "shape": "quad",
+                "texture": "Dank.png"
+            },
+            "children": [
+                {
+                    "name": "square_camera",
+                    "type": "camera",
+                    "position": { "x": 0, "y": 0 },
+                    "zoom": 0.2
+                }
+            ]
+        }
+    ]
 }

examples/square/scenes/square_alt.json

@@ -1,4 +1,6 @@
 {
+    "default_camera": "square_alt_camera",
+    "grid_background": true,
     "actors": [
         {
             "name": "square_alt",
@@ -9,7 +11,15 @@
             "mesh": {
                 "shape": "quad",
                 "color": { "r": 0.9, "g": 0.3, "b": 0.2, "a": 1.0 }
-            }
+            },
+            "children": [
+                {
+                    "name": "square_alt_camera",
+                    "type": "camera",
+                    "position": { "x": 0, "y": 0 },
+                    "zoom": 1.0
+                }
+            ]
         }
     ]
 }