How to detect mouse interaction with Line (JavaFX)

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i want to execute an anonymous function when the mouse interacts with the Line. But the methods “setOnMousePressed”, “setOnMouseClicked”, “setOnMouseEntered”, are not working.

        this.line = new Line();
        this.line.setStartX(10);
        this.line.setStartY(10);
        this.line.setEndX(20);
        this.line.setEndY(40);
        this.line.setStroke(Color.PINK);
        this.line.setStrokeWidth(5);
        this.line.setOnMouseEntered(event -> {
            System.out.println("test");
        });

If I understand correctly, this happens because the library does not consider a Shape as an interactive element, not having the necessary attributes for the “OnMouse…” methods to work. In my case I cannot use Canvas, how can I achieve this result?

  • 2

    In what specific way does it not work? There is nothing wrong with the code you posted, so any errors must elsewhere. Create and post a minimal reproducible example. “the library does not consider a Shape as an interactive element”. This is not a true statement; mouse events are triggered by shapes.

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  • exactly, i can’t find the error. The console just doesn’t print anything.

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  • 1

    So create and post a minimal reproducible example. You can’t expect anyone to diagnose code that has nothing wrong with it.

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The example code from your question already works, just run it, put the mouse over the line, and look at the console.

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.stage.Stage;

public class LineApp extends Application {
    @Override
    public void start(Stage stage) {
        Line line = new Line();
        line.setStartX(10);
        line.setStartY(10);
        line.setEndX(20);
        line.setEndY(40);
        line.setStroke(Color.PINK);
        line.setStrokeWidth(5);
        line.setOnMouseEntered(event -> System.out.println("test"));
        stage.setScene(new Scene(new Group(line)));
        stage.show();
    }
}

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