JAVAFx制造时钟代码

JavaFX是一个强大的图形用户界面（GUI）库，用于创建跨平台的富客户端应用程序。要使用JavaFX构建时钟，你可以使用`javafx.scene.canvas.Canvas`或`javafx.scene.layout.StackPane`结合`javafx.animation.AnimationTimer`来实现动态更新。下面是一个简单的例子，展示如何在JavaFX中创建一个计时器显示秒数：

import javafx.application.Application;
import javafx.animation.AnimationTimer;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class JavaFXClock extends Application {

    private int seconds = 0;
    private Canvas canvas;
    private double radius = 50;

    @Override
    public void start(Stage primaryStage) {
        canvas = new Canvas(300, 300);
        canvas.setStroke(Color.BLUE);
        canvas.setFill(Color.TRANSPARENT);
        canvas.centerXProperty().bind(primaryStage.widthProperty().divide(2));
        canvas.centerYProperty().bind(primaryStage.heightProperty().divide(2));

        var timer = new AnimationTimer() {
            @Override
            public void handle(long now) {
                seconds++;
                updateCanvas();
                if (seconds % 60 == 0) { // 当秒数为整分钟时，重置秒数
                    seconds = 0;
                }
            }
        };
        timer.start();

        StackPane root = new StackPane(canvas);
        Scene scene = new Scene(root, 300, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void updateCanvas() {
        double x = canvas.getWidth() / 2 + radius * Math.cos(Math.toRadians(seconds * 6));
        double y = canvas.getHeight() / 2 + radius * Math.sin(Math.toRadians(seconds * 6));
        canvas.getGraphicsContext2D().beginPath();
        canvas.getGraphicsContext2D().moveTo(x, y);
        canvas.getGraphicsContext2D().arcTo(x, y, radius, radius, 0, 360);
        canvas.getGraphicsContext2D().stroke();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

在这个例子中，我们创建了一个圆形路径，随着时间的流逝，秒针会在画布上移动。每过一分钟，秒针会回到起点。