用javaFX写一个雨刷实例

下面是一个简单的JavaFX雨刷实例：

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

public class RainBrush extends Application {

    private static final int WIDTH = 800;
    private static final int HEIGHT = 600;
    private static final int DROP_SIZE = 10;
    private static final int SPEED = 5;

    private GraphicsContext gc;
    private Timeline timeline;

    @Override
    public void start(Stage primaryStage) throws Exception {
        Canvas canvas = new Canvas(WIDTH, HEIGHT);
        gc = canvas.getGraphicsContext2D();
        gc.setFill(Color.BLACK);

        StackPane root = new StackPane(canvas);
        Scene scene = new Scene(root, WIDTH, HEIGHT);

        primaryStage.setScene(scene);
        primaryStage.setTitle("Rain Brush");
        primaryStage.show();

        timeline = new Timeline(new KeyFrame(Duration.millis(SPEED), event -> draw()));
        timeline.setCycleCount(Animation.INDEFINITE);
        timeline.play();
    }

    private void draw() {
        gc.clearRect(0, 0, WIDTH, HEIGHT);

        for (int i = 0; i < WIDTH; i += DROP_SIZE) {
            gc.fillRect(i, (int) (Math.random() * HEIGHT), DROP_SIZE, DROP_SIZE);
        }
    }

    @Override
    public void stop() throws Exception {
        timeline.stop();
    }

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

这个实例创建了一个800x600的画布，并在其中随机生成方块雨滴。使用Timeline和KeyFrame实现动画效果，通过清除画布并重新绘制雨滴来模拟雨刷的效果。您可以尝试调整DROP_SIZE和SPEED等变量来获得不同的效果。