diff --git a/cmd/test/main.go b/cmd/test/main.go
index ad215f2..7124366 100644
--- a/cmd/test/main.go
+++ b/cmd/test/main.go
@@ -67,13 +67,13 @@ func main() {
 	e.Spawn(rect)
 	e.Spawn(tri)
 
-	circle := &gg.Circle{}
+	/*circle := &gg.Circle{}
 	circle.Transform = gg.T()
 	circle.Rotation = 300
 	circle.Color = gg.Rgba(1, 1, 1, 1)
 	circle.Antialias = true
 	circle.Layer = HighestL
-	circle.Visible = true
+	circle.Visible = true*/
 	//e.Spawn(circle)
 
 	txt := &Text{}
diff --git a/cmd/test/player.go b/cmd/test/player.go
index 9f95de2..3df9925 100644
--- a/cmd/test/player.go
+++ b/cmd/test/player.go
@@ -48,7 +48,8 @@ func (p *Player) Draw(c *Context) []gg.EVertex {
 }
 
 func (p *Player) Update(c *Context) {
-	p.SetPosition(p.Position().Sub(gg.Y(2)))
+	//p.SetPosition(p.Position().Sub(gg.Y(2)))
+	p.Move(gg.Y(1))
 	if p.Spawned {
 		return
 	}
@@ -76,51 +77,45 @@ func (p *Player) Update(c *Context) {
 		case gg.KeyArrowRight:
 			cam.Move(gg.X(p.MoveSpeed * dt))
 		case gg.KeyW:
-			p.Move(gg.Y(p.MoveSpeed * dt*10))
+			p.Move(gg.Y(-p.MoveSpeed * dt *10))
 			walking = true
 			p.Animate(Walk)
 		case gg.KeyA:
-			p.Move(gg.X(-MoveSpeed * dt))
-			p.SetScale(gg.V(-1, 1)
+			p.Move(gg.X(-p.MoveSpeed * dt))
+			p.SetScale(gg.V(-1, 1))
 			walking = true
 			p.Animate(Walk)
 		case gg.KeyS:
-			p.Move(gg.X(-MoveSpeed * dt))
-			p.Position.Y -= p.MoveSpeed * dt
+			p.Move(gg.X(-p.MoveSpeed * dt))
+			//p.Position.Y -= p.MoveSpeed * dt
 			walking = true
 			p.Animate(Walk)
 		case gg.KeyD:
-			p.Position.X += p.MoveSpeed * dt
-			p.Scale.X = 1 
+			p.Move(gg.X(p.MoveSpeed * dt))
+			p.SetScale(gg.V(1, 1))
 			walking = true
 			p.Animate(Walk)
 		case gg.KeyR:
-			cam.Rotation += gg.Pi * p.ScaleSpeed * dt
+			cam.Rotate(gg.Pi * p.ScaleSpeed * dt)
 		case gg.KeyT:
-			cam.Rotation -= gg.Pi * p.ScaleSpeed * dt
+			cam.Rotate(-gg.Pi * p.ScaleSpeed * dt)
 		case gg.KeyRightBracket:
 			if shift {
-				p.Rotation -= gg.Pi * 0.3 * dt
+				p.Rotate(-gg.Pi * 0.3 * dt)
 			} else {
-				p.Rotation += gg.Pi * 0.3 * dt
+				p.Rotate(+gg.Pi * 0.3 * dt)
 			}
 		case gg.KeyF:
 			if shift {
-				cam.Scale = cam.Scale.Add(gg.V2(p.ScaleSpeed * dt))
+				cam.AddScale(gg.V2(p.ScaleSpeed * dt))
 			} else {
-				cam.Scale = cam.Scale.Add(gg.V2(-p.ScaleSpeed * dt))
-			}
-		case gg.KeyG:
-			if shift {
-				cam.Scale.Y -= gg.Pi * p.ScaleSpeed * dt
-			} else {
-				cam.Scale.Y += gg.Pi * p.ScaleSpeed * dt
+				cam.AddScale(gg.V2(-p.ScaleSpeed * dt))
 			}
 		case gg.KeyLeftBracket:
 			if shift {
-				rect.Rotation -= gg.Pi * 0.3 * dt
+				rect.Rotate(-gg.Pi * 0.3 * dt)
 			} else {
-				rect.Rotation += gg.Pi * 0.3 * dt
+				rect.Rotate(+gg.Pi * 0.3 * dt)
 			}
 		case gg.Key0:
 			c.Del(p)
@@ -153,10 +148,9 @@ func (p *Player) Update(c *Context) {
 		if !c.IsButtoned(gg.MouseButtonRight) {
 			break
 		}
-		pos := c.Camera.Position
-		c.Camera.Position = pos.Sub(ec.Abs)
+		c.Camera.Move(ec.Abs)
 	case *gg.WheelChange:
-		c.Camera.Scale = c.Camera.Scale.Add(gg.V2(
+		c.Camera.AddScale(gg.V2(
 			ec.Offset.Y * dt * p.ScaleSpeed * 40,
 		))
 	}}
@@ -178,7 +172,7 @@ func (p *Player) Resolve(c *Context) {
 	case gg.CollisionStaticPhysics :
 		LOOP:
 		for {
-			p.Position.Y -= 1
+			p.Move(gg.Y(-1))
 			_, collides := gg.Collide(p, col.With)
 			if !collides {
 				break LOOP
diff --git a/cmd/test/rect.go b/cmd/test/rect.go
index b4e1542..8809b16 100644
--- a/cmd/test/rect.go
+++ b/cmd/test/rect.go
@@ -8,7 +8,7 @@ type Rect struct {
 
 func NewRect() *Rect {
 	ret := &Rect{}
-	ret.Scale = gg.V(200, 400)
+	ret.SetScale(gg.V(200, 400))
 	ret.Color = gg.Color{
 		gg.MaxColorV,
 		0,
diff --git a/cmd/test/trianlge.go b/cmd/test/trianlge.go
index f6f57f6..1b3f9bb 100644
--- a/cmd/test/trianlge.go
+++ b/cmd/test/trianlge.go
@@ -14,8 +14,7 @@ type Tri struct {
 
 func NewTri() *Tri {
 	ret := &Tri{}
-	ret.Transform.Scale = gg.V2(1)
-
+	ret.Transform = gg.T()
 	ret.Triangles = gg.Triangles{
 		gg.Triangle{
 			gg.V(0, 10),
@@ -51,17 +50,17 @@ func (t *Tri) Update(c *Context) {
 
 	for _, key := range keys { switch key {
 	case gg.KeyM:
-		absPos := t.AbsPosition()
-		t.SetAbsPosition(
+		absPos := t.Position()
+		t.SetPosition(
 			absPos.Add(gg.V(0, 100*dt*d)),
 		)
 	case gg.KeyN:
-		absPos := t.AbsPosition()
-		t.SetAbsPosition(
+		absPos := t.Position()
+		t.SetPosition(
 			absPos.Add(gg.V(100*dt*d, 0)),
 		)
 	case gg.KeyV:
-			t.Rotation += d * gg.Pi * 0.3 * dt
+			t.Rotate(d * gg.Pi * 0.3 * dt)
 	case gg.Key2 :
 		if t.Spawned {
 			break
diff --git a/shader.go b/shader.go
index 8834cf2..f1fcacb 100644
--- a/shader.go
+++ b/shader.go
@@ -21,23 +21,7 @@ var (
 		
 		func Fragment(dst vec4,  src vec2, _ vec4) vec4 {
 			c := imageSrc0UnsafeAt(src)
-			size := imageSrc0Size()
-			//ret := vec4(0.1) * src.x/size.x
-			//ret := c * src.x/size.x
-			//ret.r = 1
-			//ret.a = c.a
-			//c.a = 0
-			//c.rg = vec2(0)
-			//c.a = c.b
-			//ret := vec4(1, 1, 1, 0)
-			//ret.a /= 5
-			//ret.a = src.x
-			//c.a /= 5
-			//c = vec4(c.a)
-			orig := imageSrc0Origin()
-			src -= orig
-			c.a *= (size.x-src.x)/size.x
-			return c
+			return c * sin(dst.x)
 		}
 	`))
 )
diff --git a/transform.go b/transform.go
index b20f947..54c43d2 100644
--- a/transform.go
+++ b/transform.go
@@ -77,6 +77,11 @@ func (t *Transform) SetScale(scale Vector) {
 	t.scale = scale
 }
 
+func (t *Transform) AddScale(add ...Vector) {
+	t.dirty = true
+	t.scale = t.scale.Add(add...)
+}
+
 func (t *Transform) SetAround(around Vector) {
 	t.dirty = true
 	t.around = around
@@ -134,6 +139,11 @@ func (t *Transform) Rotation() Float {
 	}
 	return t.rotation + t.parent.Rotation()
 }
+
+func (t *Transform) Rotate(add Float) {
+	t.rotation += add
+	t.dirty = true
+}
 func (t *Transform) Around() Vector {
 	return t.around
 }