idle in a direction

engine/sprite.go

@@ -13,14 +13,16 @@ const gravity = 0.2
 // Sprite combines an Actor with the ability to Draw...
 type Sprite struct {
 	Actor
-	*Anim // TODO: better
+	*Anim  // TODO: better
 	Hidden bool
 	ID
 	Src ImageRef
 	ZPos
 
-	vx, vy     float64       // TODO: refactor
+	vx, vy     float64 // TODO: refactor
-	animIdle, animRunLeft, animRunRight *Anim
+	facingLeft bool
+
+	animIdleLeft, animIdleRight, animRunLeft, animRunRight *Anim
 }
 
 func (s *Sprite) Draw(screen *ebiten.Image, geom ebiten.GeoM) {
@@ -34,12 +36,12 @@ func (s *Sprite) Draw(screen *ebiten.Image, geom ebiten.GeoM) {
 	frame := s.Anim.CurrentFrame()
 	src := s.Src.Image()
 	w, _ := src.Size()
-	sx, sy := (frame * s.Actor.Size.X) % w, ((frame * s.Actor.Size.X) / w) * s.Actor.Size.Y
+	sx, sy := (frame*s.Actor.Size.X)%w, ((frame*s.Actor.Size.X)/w)*s.Actor.Size.Y
 
-	screen.DrawImage(src.SubImage(image.Rect(sx, sy, sx + s.Actor.Size.X, sy+s.Actor.Size.Y)).(*ebiten.Image), &op)
+	screen.DrawImage(src.SubImage(image.Rect(sx, sy, sx+s.Actor.Size.X, sy+s.Actor.Size.Y)).(*ebiten.Image), &op)
 }
 
-func (s *Sprite) Scan() []interface{}{
+func (s *Sprite) Scan() []interface{} {
 	return []interface{}{&s.Actor}
 }
 
@@ -60,12 +62,17 @@ func (s *Sprite) Update() error {
 	case ebiten.IsKeyPressed(ebiten.KeyLeft):
 		s.vx = -2
 		s.Anim = s.animRunLeft
+		s.facingLeft = true
 	case ebiten.IsKeyPressed(ebiten.KeyRight):
 		s.vx = 2
 		s.Anim = s.animRunRight
+		s.facingLeft = false
 	default:
 		s.vx = 0
-		s.Anim = s.animIdle
+		s.Anim = s.animIdleRight
+		if s.facingLeft {
+			s.Anim = s.animIdleLeft
+		}
 	}
 	s.Actor.MoveX(s.vx, func() { s.vx = -s.vx * dampen })
 	s.Actor.MoveY(s.vy, func() { s.vy = -s.vy * dampen })
@@ -76,5 +83,6 @@ func (s *Sprite) Build(g *Game) {
 	// TODO: better than this
 	s.animRunLeft = &Anim{Def: AnimDefs["aw_run_left"]}
 	s.animRunRight = &Anim{Def: AnimDefs["aw_run_right"]}
-	s.animIdle = &Anim{Def: AnimDefs["aw_idle"]}
+	s.animIdleLeft = &Anim{Def: AnimDefs["aw_idle_left"]}
-}
+	s.animIdleRight = &Anim{Def: AnimDefs["aw_idle_right"]}
+}

main.go

@@ -37,41 +37,46 @@ func main() {
 				{Frame: 6, Duration: 12},
 			},
 		},
-		"aw_idle": {
+		"aw_idle_right": {
 			Frames: []engine.AnimFrame{
 				{Frame: 0, Duration: 60},
 			},
 		},
+		"aw_idle_left": {
+			Frames: []engine.AnimFrame{
+				{Frame: 1, Duration: 60},
+			},
+		},
 		"aw_walk_right": {
 			Frames: []engine.AnimFrame{
-				{Frame: 1, Duration: 6},
 				{Frame: 2, Duration: 6},
 				{Frame: 3, Duration: 6},
 				{Frame: 4, Duration: 6},
+				{Frame: 5, Duration: 6},
 			},
 		},
 		"aw_walk_left": {
 			Frames: []engine.AnimFrame{
-				{Frame: 5, Duration: 6},
 				{Frame: 6, Duration: 6},
 				{Frame: 7, Duration: 6},
 				{Frame: 8, Duration: 6},
+				{Frame: 9, Duration: 3},
 			},
 		},
 		"aw_run_right": {
 			Frames: []engine.AnimFrame{
-				{Frame: 9, Duration: 3},
 				{Frame: 10, Duration: 3},
 				{Frame: 11, Duration: 3},
 				{Frame: 12, Duration: 3},
+				{Frame: 13, Duration: 3},
 			},
 		},
 		"aw_run_left": {
 			Frames: []engine.AnimFrame{
-				{Frame: 13, Duration: 3},
 				{Frame: 14, Duration: 3},
 				{Frame: 15, Duration: 3},
 				{Frame: 16, Duration: 3},
+				{Frame: 17, Duration: 3},
 			},
 		},
 	}