added comments

groovy/manager.go

@@ -29,6 +29,7 @@ type Manager struct {
 	scenes         []Scene
 }
 
+// can be used to create default manager instance
 func NewManager() Manager {
 	return Manager{
 		Info: GameInfo{
@@ -42,6 +43,8 @@ func NewManager() Manager {
 	}
 }
 
+// ebitengine update proxy
+// manages scene transition and exists, then calls scene's update method
 func (m *Manager) Update() error {
 	if m.currentScene == nil {
 		return nil
@@ -72,20 +75,24 @@ func (m *Manager) CheckTransitions() {
 	}
 }
 
+// calls current scene's draw method if the currentscene is valid
 func (m *Manager) Draw(screen *ebiten.Image) {
 	if m.currentScene != nil {
 		m.currentScene.Draw(screen)
 	}
 }
 
+// ebitengine proxy for layout
 func (m *Manager) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
 	return m.Info.Dimension.Width, m.Info.Dimension.Height
 }
 
+// appends scene to the managed scenes
 func (m *Manager) AddScene(s Scene) {
 	m.scenes = append(m.scenes, s)
 }
 
+// sets the current scene, based on sceneindex
 func (m *Manager) SetCurrentScene(sceneId int) {
 	if sceneId >= 0 && sceneId < len(m.scenes) {
 		m.currentSceneId = sceneId