feat: impliment getSelftRect method for Arc

test/tsconfig.json

@@ -6,5 +6,5 @@
     "lib": ["ES2015", "dom"],
     "module": "CommonJS"
   },
-  "include": ["../src/*.ts"]
+  "include": ["../src/**/*.ts"]
 }

test/unit/Arc-test.ts

@@ -89,10 +89,10 @@ describe('Arc', function () {
     stage.add(layer);
 
     assert.deepEqual(arc.getSelfRect(), {
-      x: -80,
-      y: -80,
-      width: 160,
-      height: 160,
+      x: 0,
+      y: 0,
+      width: 80,
+      height: 80,
     });
   });