Split lib into multiple files

lib/event.go

@@ -0,0 +1 @@
+package lib

lib/lib.go → lib/game.go

@@ -2,59 +2,15 @@ package lib
 
 import (
 	"github.com/hajimehoshi/ebiten/v2"
-	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
 	"github.com/hajimehoshi/ebiten/v2/inpututil"
 )
 
-// Scenes: Main Menu
-// Game Mode
-
-//Scene - is the highest-level element of state the game can be in.
-
-type GameEvent struct {
-	Type int
-}
-
-type HandleResult int
-
-const (
-	EventNoOp int = iota
-	EventKeyRelease
-)
-
-const (
-	DoNothing HandleResult = iota
-	EndProgram
-)
-
-type Scene interface {
-	HandleEvent(*GameEvent) HandleResult
-	Draw(screen *ebiten.Image)
-}
-
 // Implements ebiten.Game
+// The game has
 type TetrisGame struct {
 	activeScene Scene
 }
 
-type MainMenuScene struct {
-	selections            [1]string
-	currentSelectionIndex int
-}
-
-func (menu *MainMenuScene) HandleEvent(e *GameEvent) HandleResult {
-	if e.Type == 1 {
-		if menu.selections[menu.currentSelectionIndex] == "Quit" {
-			return EndProgram
-		}
-	}
-	return DoNothing
-}
-
-func (menu *MainMenuScene) Draw(screen *ebiten.Image) {
-	ebitenutil.DebugPrint(screen, menu.selections[menu.currentSelectionIndex])
-}
-
 func NewGame() (*TetrisGame, error) {
 	return &TetrisGame{
 		activeScene: &MainMenuScene{

lib/scene.go

@@ -0,0 +1,51 @@
+package lib
+
+import (
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
+)
+
+// Scenes: Main Menu
+// Game Mode
+
+type GameEvent struct {
+	Type int
+}
+
+type HandleResult int
+
+const (
+	EventNoOp int = iota
+	EventKeyRelease
+)
+
+const (
+	DoNothing HandleResult = iota
+	EndProgram
+)
+
+// Scene is the highest level organization unit of a Game. It handles events.
+// A game has a currently active scene, and can transition
+type Scene interface {
+	// Handles a game event and returns a result.
+	HandleEvent(*GameEvent) HandleResult
+	Draw(screen *ebiten.Image)
+}
+
+type MainMenuScene struct {
+	selections            [1]string
+	currentSelectionIndex int
+}
+
+func (menu *MainMenuScene) HandleEvent(e *GameEvent) HandleResult {
+	if e.Type == 1 {
+		if menu.selections[menu.currentSelectionIndex] == "Quit" {
+			return EndProgram
+		}
+	}
+	return DoNothing
+}
+
+func (menu *MainMenuScene) Draw(screen *ebiten.Image) {
+	ebitenutil.DebugPrint(screen, menu.selections[menu.currentSelectionIndex])
+}