...

src/cmd/test/main.go

@@ -20,8 +20,9 @@ func NewPlayer() *Player {
 		Sprite: &gx.Sprite{
 			Object: &gx.Object{
 				T: gx.Transform {
-					P: gx.Vector{1, 1},
+					P: gx.Vector{100, 150},
 					S: gx.Vector{5, 5},
+					RA: gx.Vector{200, 200},
 				},
 			},
 			Image: playerImg,

src/gx/main.go

@@ -70,19 +70,15 @@ func (e *Engine) AddBehaver(b Behaver) {
 	e.behavers = append(e.behavers, b)
 }
 
-func (e *engine) setNewDT() {
-	e.dt = time.Since(e.lastTime).Seconds()
-	e.lastTime = time.Now()
-}
-
 func (e *engine) Update() error {
 	eng := (*Engine)(e)
 
-	e.setNewDT()
+	e.dt = time.Since(e.lastTime).Seconds()
 	for _, v := range eng.behavers {
 		v.Update(eng)
 		//fmt.Println(v)
 	}
+	e.lastTime = time.Now()
 
 	return nil
 }

src/gx/transform.go

@@ -29,6 +29,7 @@ func (t Transform)Matrix() Matrix {
 	g := &Matrix{}
 
 	g.Scale(t.S.X, t.S.Y)
+	g.Translate(-t.RA.X, -t.RA.Y)
 	g.Rotate(t.R)
 	g.Translate(t.P.X, t.P.Y)