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我一直在試圖創建一個程序，在窗口的中心顯示一個球，並在底部標題爲上，下，左和右4個按鈕。當您按下按鈕時，球沿相應的方向移動。我已經弄清楚了這一點，但我也需要弄清楚如何讓球從某個方向進入某個方向，從而阻止它朝着這個方向前進。我需要找到一種方法來檢測窗口的邊界，並阻止球離開邊界。這是我到目前爲止有：在JavaFX中檢測窗口邊界？
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
public class Ball extends Application {
private BallControl circle = new BallControl();
@Override
public void start(Stage primaryStage) {
HBox pane = new HBox();
pane.setSpacing(10);
pane.setAlignment(Pos.CENTER);
Button btUp = new Button("UP");
Button btDown = new Button("DOWN");
Button btLeft = new Button("LEFT");
Button btRight = new Button("RIGHT");
pane.getChildren().add(btLeft);
pane.getChildren().add(btRight);
pane.getChildren().add(btUp);
pane.getChildren().add(btDown);
BorderPane borderPane = new BorderPane();
borderPane.setCenter(circle);
borderPane.setBottom(pane);
BorderPane.setAlignment(pane, Pos.CENTER);
btUp.setOnAction(new UpHandler());
btDown.setOnAction(new DownHandler());
btLeft.setOnAction(new LeftHandler());
btRight.setOnAction(new RightHandler());
Scene scene = new Scene(borderPane, 250, 250);
primaryStage.setTitle("Ball"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show();
}
class UpHandler implements EventHandler<ActionEvent> {
public void handle(ActionEvent e) {
circle.up();
System.out.println("Up Button Pressed");
}
}
class DownHandler implements EventHandler<ActionEvent> {
public void handle(ActionEvent e) {
circle.down();
System.out.println("Down Button Pressed");
}
}
class LeftHandler implements EventHandler<ActionEvent> {
public void handle(ActionEvent e) {
circle.left();
System.out.println("Left Button Pressed");
}
}
class RightHandler implements EventHandler<ActionEvent> {
public void handle(ActionEvent e) {
circle.right();
System.out.println("Right Button Pressed");
}
}
public static void main(String[] args) {
launch(args);
}
}
class BallControl extends Pane {
public final double radius = 20;
private double x = radius, y = radius;
private double dx = 1, dy = 1;
private Circle circle = new Circle();
public BallControl() {
getChildren().add(circle);
circle.setCenterX(125.0f);
circle.setCenterY(115.0f);
circle.setRadius(25.0f);
circle.setStroke(Color.BLACK);
circle.setFill(Color.WHITE);
}
protected void moveBall() {
// Check boundaries
if (x < radius || x > getWidth() - radius) {
dx = 0; // Change ball move direction
}
if (y < radius || y > getHeight() - radius) {
dy = 0; // Change ball move direction
}
// Adjust ball position
x += dx;
y += dy;
circle.setCenterX(x);
circle.setCenterY(y);
}
public void up() {
circle.setCenterY(circle.getCenterY() - 10);
}
public void down() {
circle.setCenterY(circle.getCenterY() + 10);
}
public void left() {
circle.setCenterX(circle.getCenterX() - 10);
}
public void right() {
circle.setCenterX(circle.getCenterX() + 10);
}
}
這裏是我希望會作出邊界程序檢查的一部分，但它似乎並沒有工作：
protected void moveBall() {
// Check boundaries
if (x < radius || x > getWidth() - radius) {
dx = 0; // Change ball move direction
}
if (y < radius || y > getHeight() - radius) {
dy = 0; // Change ball move direction
}
// Adjust ball position
x += dx;
y += dy;
circle.setCenterX(x);
circle.setCenterY(y);
感謝所有的幫助傢伙，真的很感激。 – dungo
'moveBall（）'應該檢查所有方法up（），down（），left（）和right（）的碰撞嗎？ – ItachiUchiha
是的，在實踐中。 – dungo