張世旭
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    # 遊戲說明 * 在Javafx中,Application類是程序的入口點,該類中的launch用於啟動一個獨立的Javafx應用,也就是說,程序的主類要繼承Application類,並且重寫 (Overriding)其start方法,然後在main方法中調用其launch方法來啟動程序。 1.Stage舞台( 2.Scene場景( 3.Group容器( 4.各種UI ) ) ) ```java= public abstract class SApplication extends Application { private Group mGroup; private Scene mScene; @Override public void start(Stage primaryStage) throws Exception { before(); mGroup = new Group(); mScene = new Scene(mGroup, SContants.WIDTH, SContants.HEIGHT); after(); showStage(primaryStage); } public static void main(String [] args){ launch(args); } } ``` ```java= public abstract class SScreen extends Canvas implements SEvent { public SScreen(double width, double height) { super(width, height); initTimeLine(); } private void initTimeLine() { timeline = new Timeline(); //初始化時間線 timeline.setCycleCount(Timeline.INDEFINITE); keyFrame=newKeyFrame( Duration.millis(duration), newEventHandler<ActionEvent>() { @Override public void handle(ActionEvent arg0) { draw(getGraphicsContext2D()); update(); } } ); //在時間線上添加關鍵幀 timeline.getKeyFrames().add(keyFrame); } } ``` 初始化時間線,並且在時間線上添加關鍵幀, 在每一幀中我們都調用draw()方法和update()方法, 這兩個方法主要是渲染圖形和刷新圖形。 <hr> 在這個程序中,我們把所有遊戲對象都抽像成一個基類SObject, 這個類主要是對象的各種屬性,如長度、寬度等, 同時也有一個檢測是否兩個Object是否接觸的方法用來檢測貪吃蛇是否發生碰撞。 ```java= public abstract class SObject implements SEvent { protected DoubleProperty widthProperty = new SimpleDoubleProperty(0); protected DoubleProperty heightProperty = new SimpleDoubleProperty(0); protected DoubleProperty xProperty = new SimpleDoubleProperty(0); protected DoubleProperty yProperty = new SimpleDoubleProperty(0); protected BooleanProperty updateProperty = new SimpleBooleanProperty(true); protected BooleanProperty visibleProperty = new SimpleBooleanProperty(true); } ``` 有了以上三個基礎類後整個遊戲框架就基本建立起來了,再來就是配置類SCcontants用來管理窗口的大小,蛇的大小等,事件類SEvent表示鍵盤鼠標事件。 <hr> GameScreen類繼承自SScreen類,是遊戲的主要運行場景,這裡要引人一個層的概念,即遊戲畫面是由一層層的對象疊加而成的,在這個類中,我們將UI層放在最上面,將蛇(包括user蛇和AI蛇)放在中間層,最底層是食物,這樣疊加起來就形成我們看到的遊戲畫面了。 同時在這個類中,我們進行大部分的操作,如調用UI更新信息的方法,檢測是否吃到食物,是否發生碰撞等。 MainEnter類既是程序的入口,也是程序的流程控制器,當進入程序後,它先顯示出開始界面以及開始遊戲的按鈕,點擊按鈕後,程序會把主遊戲場景掛載在該類下,也就是顯示了主遊戲場景,開始了遊戲,當遊戲結束或者點擊返回按鈕後,程序會把主遊戲場景刪除掉,繼而回到開始界面,形成一個完整的遊戲邏輯。 <hr>

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