在JavaFX中与多边形点的属性绑定

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Polygon;
import javafx.stage.Stage;

public class PolygonBindingExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        // 创建多边形对象
        Polygon polygon = new Polygon();
        polygon.setFill(Color.RED);

        // 创建多边形的点属性
        DoubleProperty x1 = new SimpleDoubleProperty(100);
        DoubleProperty y1 = new SimpleDoubleProperty(100);
        DoubleProperty x2 = new SimpleDoubleProperty(200);
        DoubleProperty y2 = new SimpleDoubleProperty(200);
        DoubleProperty x3 = new SimpleDoubleProperty(300);
        DoubleProperty y3 = new SimpleDoubleProperty(100);

        // 将多边形的点属性与多边形的点列表绑定
        polygon.getPoints().addAll(
                x1.get(), y1.get(),
                x2.get(), y2.get(),
                x3.get(), y3.get()
        );

        // 创建绑定关系，使多边形的点属性与多边形的点列表保持同步
        polygon.getPoints().addListener((observable, oldValue, newValue) -> {
            x1.set(newValue.get(0));
            y1.set(newValue.get(1));
            x2.set(newValue.get(2));
            y2.set(newValue.get(3));
            x3.set(newValue.get(4));
            y3.set(newValue.get(5));
        });

        // 创建场景并显示
        Pane root = new Pane(polygon);
        Scene scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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