flesh out protocol description

examples/platformer/game.rkt

@@ -1 +1,56 @@
-#lang prospect
+#lang prospect
+
+(require racket
+         "./geometry.rkt"
+         "./periodic_timer.rkt")
+
+#|
+
+Layers:
+- External Events
+  * key press/release
+- Ground
+corresponds to computer itself - device drivers and applications
+  
+- Game
+running application
+per-game state, such as score and count-of-deaths
+process which spawns levels
+
+- Level
+model of the game world
+actors represent entities in the world, mostly
+misc actors do physicsish things
+
+
+
+title Jump Sequence
+
+Player -> Physics: (jump 'player)
+note right of Physics: Considers the request.
+note right of Physics: Denied -- Player is not on a surface.
+
+Player -> Physics: (jump 'player)
+note right of Physics: Considers the request.
+note right of Physics: Accepted.
+note right of Physics: Updates velocity, position
+Physics -> Subscribers: (vel 'player ...)
+Physics -> Subscribers: (pos 'player ...)
+
+
+
+
+title Display Control Updates
+
+Physics -> DisplayCtl: (pos 'player ...)
+note right of DisplayCtl: Compares player pos to level size
+DisplayCtl -> Subscribers: (at-meta (at-meta (scroll-offset ...)))
+
+
+
+
+
+
+
+
+|#