JavaFX 8-如何擦除背景的一部分使其透明

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.effect.BlendMode;
import javafx.stage.Stage;

public class TransparentBackgroundExample extends Application {
    public void start(Stage primaryStage) {
        // 创建场景和根节点
        StackPane root = new StackPane();
        Scene scene = new Scene(root, 400, 300);

        // 创建背景图像
        Image backgroundImage = new Image("background.jpg");
        ImageView backgroundImageView = new ImageView(backgroundImage);

        // 创建覆盖背景的矩形
        Rectangle overlayRectangle = new Rectangle(scene.getWidth(), scene.getHeight());
        overlayRectangle.setFill(Color.TRANSPARENT);

        // 设置混合模式和透明度
        backgroundImageView.setBlendMode(BlendMode.SRC_ATOP);
        backgroundImageView.setOpacity(0.5);

        // 将矩形和背景图像添加到根节点
        root.getChildren().addAll(overlayRectangle, backgroundImageView);

        // 设置场景并显示舞台
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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