toast!

engine/debug.go

@@ -16,9 +16,11 @@ import (
 var (
 	_ Drawer      = PerfDisplay{}
 	_ DrawOrderer = PerfDisplay{}
+	_ Hider       = &PerfDisplay{}
 
-	_ Prepper = &GobDumper{}
-	_ Updater = &GobDumper{}
+	_ Disabler = &GobDumper{}
+	_ Prepper  = &GobDumper{}
+	_ Updater  = &GobDumper{}
 )
 
 func init() {
@@ -26,9 +28,41 @@ func init() {
 	gob.Register(PerfDisplay{})
 }
 
+// DebugToast debugprints a string for a while, then disappears.
+type DebugToast struct {
+	ID
+	Hidden
+	Timer int // ticks
+	Text  string
+}
+
+func (d *DebugToast) Draw(screen *ebiten.Image, _ ebiten.DrawImageOptions) {
+	if d.Hidden {
+		return
+	}
+	ebitenutil.DebugPrintAt(screen, d.Text, 0, 20)
+}
+
+func (d *DebugToast) DrawOrder() float64 {
+	return math.MaxFloat64
+}
+
+func (d *DebugToast) Toast(text string) {
+	d.Text = text
+	d.Timer = 120
+	d.Hidden = false
+}
+
+func (d *DebugToast) Update() error {
+	if d.Hidden = d.Timer <= 0; !d.Hidden {
+		d.Timer--
+	}
+	return nil
+}
+
 // PerfDisplay debugprints CurrentTPS and CurrentFPS in the top left.
 type PerfDisplay struct {
-	Hidden bool
+	Hidden
 }
 
 func (p PerfDisplay) Draw(screen *ebiten.Image, _ ebiten.DrawImageOptions) {
@@ -46,6 +80,7 @@ func (PerfDisplay) DrawOrder() float64 {
 // GobDumper waits for a given key combo, then dumps the game into a gob file
 // in the current directory.
 type GobDumper struct {
+	Disabled
 	KeyCombo []ebiten.Key
 
 	game *Game
@@ -56,6 +91,9 @@ func (d *GobDumper) Prepare(g *Game) { d.game = g }
 
 // Update waits for the key combo, then dumps the game state into a gzipped gob.
 func (d *GobDumper) Update() error {
+	if d.Disabled {
+		return nil
+	}
 	for _, key := range d.KeyCombo {
 		if !ebiten.IsKeyPressed(key) {
 			return nil

game/aw.go

@@ -18,8 +18,10 @@ type Awakeman struct {
 	engine.Sprite
 
 	CameraID string
+	ToastID  string
 
 	camera      *engine.Camera
+	toast       *engine.DebugToast
 	vx, vy      float64
 	facingLeft  bool
 	coyoteTimer int
@@ -33,6 +35,13 @@ func (aw *Awakeman) Update() error {
 	// TODO: better cheat for noclip
 	if inpututil.IsKeyJustPressed(ebiten.KeyN) {
 		aw.noclip = !aw.noclip
+		if aw.toast != nil {
+			if aw.noclip {
+				aw.toast.Toast("noclip enabled")
+			} else {
+				aw.toast.Toast("noclip disabled")
+			}
+		}
 	}
 	upd := aw.realUpdate
 	if aw.noclip {
@@ -162,6 +171,7 @@ func (aw *Awakeman) realUpdate() error {
 
 func (aw *Awakeman) Prepare(game *engine.Game) {
 	aw.camera = game.Component(aw.CameraID).(*engine.Camera)
+	aw.toast, _ = game.Component(aw.ToastID).(*engine.DebugToast)
 
 	aw.animIdleLeft = &engine.Anim{Frames: []engine.AnimFrame{
 		{Frame: 1, Duration: 60},

main.go

@@ -94,6 +94,7 @@ func main() {
 			},
 			&game.Awakeman{
 				CameraID: "game_camera",
+				ToastID:  "toast",
 				Sprite: engine.Sprite{
 					ID: "awakeman",
 					Actor: engine.Actor{
@@ -123,6 +124,9 @@ func main() {
 					ID:    "game_camera",
 					Scene: level1,
 				},
+				&engine.DebugToast{
+					ID: "toast",
+				},
 				engine.PerfDisplay{},
 			},
 		},