Fixed delta time implementation.

src/cmd/test/main.go

@@ -21,7 +21,7 @@ func NewPlayer() *Player {
 			Object: &gx.Object{
 				T: gx.Transform {
 					P: gx.Vector{1, 1},
-					S: gx.Vector{1, 1},
+					S: gx.Vector{5, 5},
 				},
 			},
 			Image: playerImg,
@@ -30,7 +30,7 @@ func NewPlayer() *Player {
 }
 
 func (p *Player) Update(e *gx.Engine) {
-	p.Sprite.Object.T.P.Y += 0.1
+	p.Sprite.Object.T.P.Y += 40 * e.DT()
 }
 
 func main() {

src/gx/main.go

@@ -70,15 +70,19 @@ 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.dt = time.Since(e.lastTime).Seconds()
+	e.setNewDT()
 	for _, v := range eng.behavers {
 		v.Update(eng)
 		//fmt.Println(v)
 	}
-	e.lastTime = time.Now()
 
 	return nil
 }
@@ -106,6 +110,8 @@ func (e *Engine) Run() error {
 	ebiten.SetWindowTitle(e.wcfg.Title)
 	ebiten.SetWindowSize(e.wcfg.Width, e.wcfg.Height)
 
+	e.lastTime = time.Now()
+
 	return ebiten.RunGame((*engine)(e))
 }