Binding the line to the centre of a node

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I am creating an animation, where I have two circles joined by a line. When the nodes(circles) move, I want the line to bind their centres. What I have tried?

import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;
import javafx.stage.Stage;
import javafx.util.Duration;

public class BindIt extends Application {

    @Override
    public void start(Stage primaryStage) {
        DoubleProperty startX = new SimpleDoubleProperty(100);
        DoubleProperty startY = new SimpleDoubleProperty(100);
        DoubleProperty endX = new SimpleDoubleProperty(300);
        DoubleProperty endY = new SimpleDoubleProperty(300);
        Line line = new Line(100, 100, 300, 300);
        line.startXProperty().bind(startX);
        line.startYProperty().bind(startY);
        line.endXProperty().bind(endX);
        line.endYProperty().bind(endY);
        Circle c1 = new Circle(25);
        c1.setCenterX(100);
        c1.setCenterY(100);
        c1.centerXProperty().bind(startX);
        c1.centerYProperty().bind(startY);

        Circle c2 = new Circle(25);
        c2.setCenterX(300);
        c2.setCenterY(300);
        c2.centerXProperty().bind(endX);
        c2.centerYProperty().bind(endY);


        Group root = new Group();
        root.getChildren().add(line);
        root.getChildren().add(c1);
        root.getChildren().add(c2);

        Scene scene = new Scene(root, 500, 500);

        primaryStage.setTitle("Bind the line!");
        primaryStage.setScene(scene);
        final Timeline timeline = new Timeline();
        timeline.getKeyFrames().addAll(new KeyFrame(Duration.millis(0)), new KeyFrame(Duration.millis(2000), new KeyValue(c1.centerXProperty(), 200)));
        timeline.play();

        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

}

Can someone tell me where am I doing wrong?

asked 39 secs ago

Anil

1

Binding the line to the centre of a node