snake设计图

Controller(手柄)

+ upState:State+ downState:State+ leftState:State+ rightState:State+ currentState:State

+ refresh():void+ up(): void+ down(): void+ left(): void+ right(): void

Block

+ x:int+ y:int

DownState

+ snake: snake+ controller:Controller

+ refresh():void+ up(): void+ dwon(): void+ left(): void+ right(): void

Canvas

<<abstract>>State

Scene

+ keyPressedListener(key)

Score

- score:int

+ add():void+ draw(GraphicsContext gc)

LeftState

UpState

Main

+ speed: int+ width: int+ height: int+ blocksize: int+ snake: Snake+ food : Food+ controller: Controller+ score: Score+ scene: Scene+ canvas: Canvas

+ start(Stage primaryStage):void

AnimationTimer(定时器)

+ handle():void

Food

+ x:int+ y:int+ color: Color

Snake

- blocks: List<Block>- tail: Block

RightState