feat: improve menu

game/state/handlers/menu.go

@@ -7,22 +7,54 @@ import (
 	rl "github.com/gen2brain/raylib-go/raylib"
 )
 
-type Menu struct{}
-
-func (menu *Menu) Enter() {
+type entry struct {
+	label string
+	state string
 }
 
-func (menu *Menu) Exit() {
+type Menu struct {
+	selected int
+	entries  []entry
+}
+
+func NewMenu() *Menu {
+	return &Menu{
+		selected: 0,
+		entries: []entry{
+			{"Start", "gameplay"},
+			{"Quit", "quit"},
+		},
+	}
+}
+
+func (menu *Menu) Enter() {
+	menu.selected = 0
+}
+
+func (Menu) Exit() {
 }
 
 func (menu *Menu) Update(fsm state.Transitioner, delta float32) {
 	if rl.IsKeyPressed(rl.KeyEnter) {
-		fsm.Switch("gameplay")
+		fsm.Switch(menu.entries[menu.selected].state)
+	} else if rl.IsKeyPressed(rl.KeyDown) {
+		menu.selected = min(menu.selected+1, len(menu.entries)-1)
+	} else if rl.IsKeyPressed(rl.KeyUp) {
+		menu.selected = max(menu.selected-1, 0)
 	}
 }
 
-func (menu *Menu) Render() {
+func (menu Menu) Render() {
 	render.Begin(rl.Black)
-	render.DrawText(250, 400, 32, "Start", rl.White)
+	y := int32(400)
+	for i, entry := range menu.entries {
+
+		col := rl.White
+		if i == menu.selected {
+			col = rl.Red
+		}
+		render.DrawTextCenter(340, y, 32, entry.label, col)
+		y += 40
+	}
 	render.End()
 }

main.go

@@ -35,7 +35,7 @@ func main() {
 
 	// Setup state machine.
 	fsm := machine.New()
-	fsm.Register("menu", &handlers.Menu{})
+	fsm.Register("menu", handlers.NewMenu())
 	fsm.Register("gameover", &handlers.GameOver{})
 	fsm.Register("gameplay", handlers.NewGamePlay())
 	fsm.Start("menu")