Use pointer to object instead of struct for embedding.

src/cmd/test/main.go

@@ -5,7 +5,13 @@ import (
 )
 
 type Player struct {
-	gx.Object
+	*gx.Object
+}
+
+func NewPlayer() *Player {
+	return &Player{
+		Object: &gx.Object{},
+	}
 }
 
 func main() {
@@ -15,6 +21,6 @@ func main() {
 		Height: 320,
 	})
 
-	e.Add(0, Player{})
+	e.Add(0, NewPlayer())
 	e.Run()
 }

src/gx/object.go

@@ -6,11 +6,6 @@ type Behaver interface {
 	GetObject() *Object
 }
 
-// The object that is drawn by sprite
-/// based on the transform.
-type Sprite struct {
-}
-
 // The object type represents
 // basic information for interaction
 // with the engine.
@@ -19,9 +14,9 @@ type Object struct {
 }
 
 // The functions that 
-func (o Object) Start(e *Engine) {}
+func (o *Object) Start(e *Engine) {}
-func (o Object) Update(e *Engine) {}
+func (o *Object) Update(e *Engine) {}
-func (o Object) GetObject() *Object {
+func (o *Object) GetObject() *Object {
-	return &o
+	return o
 }
 

src/gx/sprite.go

@@ -1,3 +1,4 @@
 package gx
 
-
+type Sprite struct {
+}