Updates documentation

Author: Joel Schutz

README.md

@@ -34,6 +34,7 @@ type MyState struct {
 
 type MyScene struct {
     // your scene fields
+    sm *stagehand.SceneManager[MyState]
 }
 
 func (s *MyScene) Update() error {
@@ -44,8 +45,9 @@ func (s *MyScene) Draw(screen *ebiten.Image) {
     // your draw code
 }
 
-func (s *MyScene) Load(state MyState ,manager *stagehand.SceneManager) {
+func (s *MyScene) Load(state MyState ,manager stagehand.SceneController[MyState]) {
     // your load code
+    s.sm = manager.(*stagehand.SceneManager[MyState]) // This type assertion is important
 }
 
 func (s *MyScene) Unload() MyState {
@@ -75,6 +77,7 @@ We provide some example code so you can start fast:
 - [Simple Example](https://github.com/joelschutz/stagehand/blob/master/examples/simple/main.go)
 - [Timed Transition Example](https://github.com/joelschutz/stagehand/blob/master/examples/timed/main.go)
 - [Transition Awareness Example](https://github.com/joelschutz/stagehand/blob/master/examples/aware/main.go)
+- [Scene Director Example](https://github.com/joelschutz/stagehand/blob/master/examples/director/main.go)
 
 ## Transitions
 
@@ -100,7 +103,7 @@ The `FadeTransition` will fade out the current scene while fading in the new sce
 func (s *MyScene) Update() error {
     // ...
     scene2 := &OtherScene{}
-    s.manager.SwitchWithTransition(scene2. stagehand.NewFadeTransition(.05))
+    s.manager.SwitchWithTransition(scene2, stagehand.NewFadeTransition(.05))
 
     // ...
 }
@@ -116,7 +119,7 @@ The `SlideTransition` will slide out the current scene and slide in the new scen
 func (s *MyScene) Update() error {
     // ...
     scene2 := &OtherScene{}
-    s.manager.SwitchWithTransition(scene2. stagehand.NewSlideTransition(stagehand.LeftToRight, .05))
+    s.manager.SwitchWithTransition(scene2, stagehand.NewSlideTransition(stagehand.LeftToRight, .05))
 
     // ...
 }
@@ -183,6 +186,65 @@ Unload Called on old scene
 PostTransition Called on new scene
 ```
 
+## SceneDirector
+
+The `SceneDirector` is an alternative way to manage the transitions between scenes. It provides transitioning between scenes based on a set of rules just like a FSM. The `Scene` implementation is the same, with only a feel differences, first you need to assert the `SceneDirector` instead of the `SceneManager`:
+
+```go
+type MyScene struct {
+    // your scene fields
+    director *stagehand.SceneDirector[MyState]
+}
+
+func (s *MyScene) Load(state MyState ,director stagehand.SceneController[MyState]) {
+    // your load code
+    s.director = director.(*stagehand.SceneDirector[MyState]) // This type assertion is important
+}
+```
+
+Then define a ruleSet of `Directive` and `SceneTransitionTrigger` for the game.
+
+```go
+// Triggers are int type underneath
+const (
+	Trigger1 stagehand.SceneTransitionTrigger = iota
+    Trigger2
+)
+
+func main() {
+    // ...
+    scene1 := &MyScene{}
+    scene2 := &OtherScene{}
+
+    // Create a rule set for transitioning between scenes based on Triggers
+    ruleSet := make(map[stagehand.Scene[MyState]][]Directive[MyState])
+    directive1 := Directive[MyState]{Dest: scene2, Trigger: Trigger1}
+    directive2 := Directive[MyState]{Dest: scene1, Trigger: Trigger2, Transition: stagehand.NewFadeTransition(.05)} // Add transitions inside the directive
+
+    // Directives are mapped to each Scene pointer and can be shared
+    ruleSet[scene1] = []Directive[MyState]{directive1, directive2}
+    ruleSet[scene2] = []Directive[MyState]{directive2}
+
+    state := MyState{}
+    manager := stagehand.NewSceneDirector[MyState](scene1, state, ruleSet)
+
+    if err := ebiten.RunGame(sm); err != nil {
+        log.Fatal(err)
+    }
+}
+```
+
+Now you can now notify the `SceneDirector` about activated `SceneTransitionTrigger`, if no `Directive` match, the code will still run without errors.
+
+```go
+func (s *MyScene) Update() error {
+    // ...
+	s.manager.ProcessTrigger(Trigger)
+
+    // ...
+}
+```
+
 ## Contribution
 
 Contributions are welcome! If you find a bug or have a feature request, please open an issue on GitHub. If you would like to contribute code, please fork the repository and submit a pull request.

examples/director/main.go

@@ -19,8 +19,8 @@ const (
 
 type State int
 
-var (
-	Trigger stagehand.SceneTransitionTrigger = 1
+const (
+	Trigger stagehand.SceneTransitionTrigger = iota
 )
 
 type BaseScene struct {