Implemented scene events and callback handlers for those events. Manager defaults also added.

examples/splashmenu/main.go

@@ -11,13 +11,16 @@ import (
 )
 
 func main() {
+
+	//setup manager
 	manager := groovy.NewManager()
-
-	loadScenes(&manager)
-
+	manager.SetDimensions(groovy.Area{Width: 1280, Height: 720})
 	ebiten.SetWindowSize(manager.Info.Dimension.Width, manager.Info.Dimension.Height)
 	ebiten.SetWindowTitle(manager.Info.Name)
 
+	loadScenes(&manager)
+
+	//identification
 	fmt.Println(manager.Info.Name + ": v" + manager.Info.Version)
 
 	if err := ebiten.RunGame(&manager); err != nil {
@@ -28,14 +31,31 @@ func main() {
 
 // Example loading of two scenes
 func loadScenes(m *groovy.Manager) {
+	//call the loaders for each scene
+	loadSplash(m)
+	loadMenu(m)
+
+	//reset the manager to start scene 1
+	m.ResetScenes()
+}
+
+// creates splash screen, sets completion handler
+func loadSplash(m *groovy.Manager) {
+	//create splash screen and append as first scene in manager
 	sceneSplash := splashmenu.NewSplash()
 	m.AddScene(&sceneSplash)
-
-	sceneMenu := splashmenu.NewMenu()
-	m.AddScene(&sceneMenu)
-
-	//sets current scene to the splash menu
-	m.SetCurrentScene(0)
-
-	m.SetDimensions(groovy.Area{Width: 1280, Height: 720})
+}
+
+// creates menu screen, populates the options, sets key event handler
+func loadMenu(m *groovy.Manager) {
+	//create menu with defined options, append to manager
+	sceneMenu := splashmenu.NewMenu()
+	sceneMenu.SetOptions(map[int]splashmenu.MenuOption{
+		1: {Description: "splash", SelectionEvent: groovy.RESET, Mapping: ebiten.Key1},
+		2: {Description: "menu"},
+		3: {Description: "swing"},
+		4: {Description: "exit", SelectionEvent: groovy.ENDGAME, Mapping: ebiten.Key4},
+	})
+
+	m.AddScene(&sceneMenu)
 }

examples/splashmenu/scenes/menu.go

@@ -1,8 +1,10 @@
 package splashmenu
 
 import (
+	"cosmos/diego/groovy"
 	"image/color"
 	"log"
+	"strconv"
 
 	"github.com/hajimehoshi/ebiten/v2"
 	"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
@@ -13,6 +15,7 @@ import (
 )
 
 var (
+	titleFont font.Face
 	menuFont  font.Face
 )
 
@@ -23,8 +26,17 @@ func init() {
 	}
 
 	const dpi = 72
+	titleFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
+		Size:    16,
+		DPI:     dpi,
+		Hinting: font.HintingVertical,
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	menuFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
-		Size:    12,
+		Size:    10,
 		DPI:     dpi,
 		Hinting: font.HintingVertical,
 	})
@@ -35,34 +47,61 @@ func init() {
 
 type Menu struct {
 	bgcolor color.RGBA
-	completed bool
+	options map[int]MenuOption
+	events  map[groovy.SceneEvent]func()
 }
 
 func NewMenu() Menu {
 	return Menu{
 		bgcolor: color.RGBA{0x33, 0x33, 0x99, 0xFF},
-		completed: false,
+		events:  make(map[groovy.SceneEvent]func()),
 	}
 }
 
 func (m *Menu) Draw(screen *ebiten.Image) {
 	screen.Fill(m.bgcolor)
-	text.Draw(screen, "menu", menuFont, 40, 40, color.White)
+	text.Draw(screen, "menu", titleFont, 40, 40, color.White)
+
+	m.RenderOptions(screen)
+}
+
+func (m Menu) SetEventHandler(event groovy.SceneEvent, f func()) {
+	m.events[event] = f
+}
+
+func (m *Menu) SetOptions(options map[int]MenuOption) {
+	m.options = make(map[int]MenuOption)
+
+	for k, v := range options {
+		m.options[k] = v
+	}
+}
+
+func (m *Menu) RenderOptions(screen *ebiten.Image) {
+
+	var offset int = 20
+
+	for k, v := range m.options {
+		m.options[k] = v
+		text.Draw(screen, strconv.Itoa(k)+": "+v.Description, menuFont, 40, 60+offset*k, color.White)
+	}
+
 }
 
 func (m *Menu) Update() error {
 
 	var keysPressed []ebiten.Key
 	keysPressed = inpututil.AppendPressedKeys(keysPressed[:0])
+
+	for _, o := range m.options {
+		if m.events[o.SelectionEvent] != nil {
 			for _, k := range keysPressed {
-		if k == ebiten.KeyEnter {
-			m.completed = true
+				if k == o.Mapping {
+					m.events[o.SelectionEvent]()
+				}
+			}
 		}
 	}
 
 	return nil
 }
-
-func (m *Menu) Completed() bool {
-	return m.completed
-}

examples/splashmenu/scenes/menuoption.go

@@ -0,0 +1,13 @@
+package splashmenu
+
+import (
+	"cosmos/diego/groovy"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type MenuOption struct {
+	Description    string
+	SelectionEvent groovy.SceneEvent
+	Mapping        ebiten.Key
+}

examples/splashmenu/scenes/splash.go

@@ -1,6 +1,7 @@
 package splashmenu
 
 import (
+	"cosmos/diego/groovy"
 	"image/color"
 	"log"
 
@@ -34,14 +35,19 @@ func init() {
 
 type Splash struct {
 	bgcolor   color.RGBA
-	completed bool
 	increment int
+	events    map[groovy.SceneEvent]func()
+}
+
+// GetSceneEvents implements groovy.Scene.
+func (*Splash) GetSceneEvents() []groovy.SceneEvent {
+	return nil
 }
 
 func NewSplash() Splash {
 	return Splash{
 		bgcolor: color.RGBA{0xFF, 0xFF, 0xFF, 0xFF},
-		completed: false,
+		events:  make(map[groovy.SceneEvent]func()),
 	}
 }
 
@@ -58,12 +64,12 @@ func (s *Splash) Update() error {
 	s.bgcolor.B = (s.bgcolor.B - 2) % 0xFF
 
 	if s.bgcolor.R == 0x00 {
-		s.completed = true
+		s.events[groovy.COMPLETED]()
 	}
 
 	return nil
 }
 
-func (s *Splash) Completed() bool {
-	return s.completed
+func (s Splash) SetEventHandler(event groovy.SceneEvent, f func()) {
+	s.events[event] = f
 }

manager.go

@@ -25,8 +25,10 @@ type GameInfo struct {
 type Manager struct {
 	Info           GameInfo
 	currentScene   Scene
-	currentSceneId int
+	currentSceneId uint
+	nextSceneId    uint
 	scenes         []Scene
+	EventMap       map[SceneEvent]func()
 }
 
 // can be used to create default manager instance
@@ -37,9 +39,11 @@ func NewManager() Manager {
 			Version: "1.0",
 			Dimension: Area{
 				Width:  defaultWidth,
-				Height: defaultHeight},
+				Height: defaultHeight,
+			},
 		},
 		currentSceneId: 0,
+		nextSceneId:    1,
 	}
 }
 
@@ -50,30 +54,14 @@ func (m *Manager) Update() error {
 		return nil
 	}
 
-	m.CheckTransitions()
-	m.CheckExit()
-
 	//call the current scene's update method
 	return m.currentScene.Update()
 
 }
 
-// check for exit condition
-func (m *Manager) CheckExit() {
-	if m.currentSceneId >= len(m.scenes) {
+func (m *Manager) Quit() {
 	os.Exit(0)
 }
-}
-
-// check for scene completion and if reached, set up next scene (if available)
-func (m *Manager) CheckTransitions() {
-	if m.currentScene.Completed() {
-		m.currentSceneId++
-		if m.currentSceneId < len(m.scenes) {
-			m.currentScene = m.scenes[m.currentSceneId]
-		}
-	}
-}
 
 // calls current scene's draw method if the currentscene is valid
 func (m *Manager) Draw(screen *ebiten.Image) {
@@ -89,18 +77,57 @@ func (m *Manager) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHe
 
 // appends scene to the managed scenes
 func (m *Manager) AddScene(s Scene) {
+	setDefaultHandlers(m, s)
 	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
-		m.currentScene = m.scenes[m.currentSceneId]
-	}
+// sets the default callback handlers for a given scene within manager
+// Default Handling behaviours:
+//
+//	reset: sets (scene, nextscene) to {0, 1}
+//	scene completion: sets (scene, nextscene) to {nextscene, nextscene+1}
+//	end game: shutdown groovy
+//
+//	note: NOOP and RELOAD are purposefully not mapped; they are scene
+//	specific and should be mapped to by user of groovy
+func setDefaultHandlers(m *Manager, s Scene) {
+	s.SetEventHandler(RESET, func() { m.ResetScenes() })
+	s.SetEventHandler(COMPLETED, func() { m.TransitionScene() })
+	s.SetEventHandler(ENDGAME, func() { m.Quit() })
 }
 
-// check for exit condition
+// we're going to reset the scene to the first one
+func (m *Manager) ResetScenes() {
+	m.currentSceneId = 0
+	m.nextSceneId = 1
+	m.SetCurrentScene(0)
+}
+
+// sets the current scene, based on sceneindex n
+// n > scenelist, quit
+// otherwise, scene = n
+func (m *Manager) SetCurrentScene(sceneId uint) {
+	if sceneId >= uint(len(m.scenes)) {
+		m.Quit()
+	}
+	m.currentSceneId = sceneId
+	m.currentScene = m.scenes[sceneId]
+}
+
+func (m *Manager) TransitionScene() {
+	m.SetCurrentScene(m.nextSceneId)
+}
+
+func (m *Manager) SetNextScene(sceneId uint) {
+	m.nextSceneId = sceneId
+}
+
+// sets sene dimensions
 func (m *Manager) SetDimensions(a Area) {
 	m.Info.Dimension = a
 }
+
+// report number of total scenes
+func (m *Manager) SceneCount() uint {
+	return uint(len(m.scenes))
+}

scene.go

@@ -2,8 +2,23 @@ package groovy
 
 import "github.com/hajimehoshi/ebiten/v2"
 
+type SceneEvent int64
+
+const (
+	NOOP      SceneEvent = 0
+	RESET     SceneEvent = 1 // reset to initial scene
+	RELOAD    SceneEvent = 3 // reload current scene
+	COMPLETED SceneEvent = 4 // current scene has completed
+	ENDGAME   SceneEvent = 5 // shutdown all scenes
+)
+
 type Scene interface {
 	Update() error
 	Draw(screen *ebiten.Image)
-	Completed() bool
+	SetEventHandler(e SceneEvent, f func())
+}
+
+type ArgoScale interface {
+	Draw(screen *ebiten.Image)
+	GetSceneEvents() []SceneEvent
 }