diff --git a/animation.go b/animation.go
new file mode 100644
index 0000000..fb4b1be
--- /dev/null
+++ b/animation.go
@@ -0,0 +1,34 @@
+package gg
+
+import (
+	"time"
+)
+
+type Animation struct {
+	Frames []*Image
+}
+
+type AnimationId int
+type AnimationSet map[AnimationId] *Animation
+
+// The type implements animated sprites.
+type AnimatedSprite struct {
+	Sprite
+	Animations AnimationSet
+	AnimationId AnimationId
+	CurrentFrame int
+	TimeBetweenFrames time.Duration
+}
+
+func (as *AnimatedSprite) Animate(id AnimationId) bool {
+	_, ok := as.Animations[id]
+	if ok {
+		as.AnimationId = id
+	}
+	return ok
+}
+
+func (as *AnimatedSprite) Draw(c *Context) []EVertex {
+	return nil
+}
+
diff --git a/cmd/test/debug.go b/cmd/test/debug.go
index f869971..34669e3 100644
--- a/cmd/test/debug.go
+++ b/cmd/test/debug.go
@@ -23,6 +23,12 @@ func (d *Debug) Draw(c *Context) []gg.EVertex {
 	keyStrs = append(keyStrs, fmt.Sprintf(
 		"fps: %d", int(c.Fps()),
 	))
+	keyStrs = append(keyStrs, fmt.Sprintf(
+		"dframe: %d", int(c.Dframe()),
+	))
+	keyStrs = append(keyStrs, fmt.Sprintf(
+		"frame: %d", int(c.Frame()),
+	))
 	keyStrs = append(keyStrs, fmt.Sprintf(
 		"relPlayerPos: %v", player.Position,
 	))
diff --git a/cmd/test/text.go b/cmd/test/text.go
index 71c98a5..9cca67c 100644
--- a/cmd/test/text.go
+++ b/cmd/test/text.go
@@ -4,8 +4,21 @@ import (
 	"vultras.su/core/gg"
 )
 
-type Text struct {
-	gg.Text
+type Objecter interface{
 }
 
+type Wrap[V Objecter] struct {
+	O V
+}
+
+//func (w *Wrap) 
+
+type Context2 struct {
+	*gg.Context
+}
+
+type Text Wrap[struct{
+	gg.Text
+}]
+
 //func (txt *Text) Update()
diff --git a/engine.go b/engine.go
index 5b1c82c..77d4648 100644
--- a/engine.go
+++ b/engine.go
@@ -61,10 +61,12 @@ type Engine struct {
 	// If is set to nil then the engine will panic.
 	Camera *Camera
 
-	// The same delta time for all frames
-	// and all objects.
 	lastTime time.Time
-	dt, fdt Float
+	dt Float
+
+	// Frame delta time.
+	fdt Float
+	fLastTime time.Time
 
 	// Temporary stuff 
 	keys, prevKeys []Key
@@ -77,6 +79,12 @@ type Engine struct {
 	//bufs [LayerBufSize]*Image
 	vertices map[Layer] []ebiten.Vertex
 	//vindices []uint16
+
+	// Draw frame.
+	dframe uint
+
+	// Frame.
+	frame uint
 }
 
 type engine Engine
@@ -220,6 +228,7 @@ func (e *Engine) AbsCursorPosition() Vector {
 
 func (e *engine) Update() error {
 	eng := (*Engine)(e)
+	e.fdt = time.Since(e.fLastTime).Seconds()
 
 	// Buffering the context for faster.
 
@@ -293,7 +302,8 @@ func (e *engine) Update() error {
 		object.Input() <- c
 	}
 	e.wg.Wait()
-
+	e.fLastTime = time.Now()
+	e.frame++
 	return nil
 }
 
@@ -369,6 +379,7 @@ func (e *engine) Draw(img *ebiten.Image) {
 	// Empty the buff to generate it again.
 	eng.Camera.buffered = false
 	e.lastTime = time.Now()
+	e.dframe++
 }
 
 func (e *engine) Layout(ow, oh int) (int, int) {
@@ -384,11 +395,19 @@ func (e *Engine) Dt() Float {
 	return e.dt
 }
 
+func (e *Engine) Dframe() uint {
+	return e.dframe
+}
+
 // Return the current fixed delta time.
 func (e *Engine) Fdt() Float {
 	return 1/60
 }
 
+func (e *Engine) Frame() uint {
+	return e.frame
+}
+
 func (e *Engine) Fps() float64 {
 	return ebiten.ActualFPS()
 }