延迟在JavaFX画布上绘制线条

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.util.Duration;

public class DelayedLineDrawing extends Application {

    private static final int WIDTH = 800;
    private static final int HEIGHT = 600;
    private static final int DELAY = 50; // 每条线的延迟时间（毫秒）
    private static final int TOTAL_LINES = 100; // 总共要绘制的线条数量

    private Canvas canvas;
    private GraphicsContext gc;
    private int linesDrawn;

    @Override
    public void start(Stage primaryStage) {
        canvas = new Canvas(WIDTH, HEIGHT);
        gc = canvas.getGraphicsContext2D();
        linesDrawn = 0;

        Timeline timeline = new Timeline(new KeyFrame(Duration.millis(DELAY), event -> drawLine()));
        timeline.setCycleCount(TOTAL_LINES);
        timeline.play();

        Group root = new Group();
        root.getChildren().add(canvas);

        Scene scene = new Scene(root, WIDTH, HEIGHT);
        primaryStage.setScene(scene);
        primaryStage.setTitle("Delayed Line Drawing");
        primaryStage.show();
    }

    private void drawLine() {
        // 绘制线条的逻辑
        gc.setStroke(Color.BLACK);
        gc.setLineWidth(2.0);
        gc.strokeLine(0, linesDrawn, WIDTH, linesDrawn);

        linesDrawn++;
    }

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