What is the preferred way of getting the frame rate of a JavaFX application?

Question

This is quite a simple question:

What is the preferred way of getting the frame rate of a JavaFX application?

Google turns up a result from 2009, but that e

Answer 1

I just copied James_D program and changed to using the PerformanceTracker. The options I copied from the program I had downloaded earlier called JavaFXBalls3. The options don't seem to make a difference.

Press any key to to see what the label says. Mine's always near 60. Maybe a more complicated scene would be lower. AFAIK 60 is the max for animation.

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;

import com.sun.javafx.perf.PerformanceTracker;
import java.security.AccessControlException;
import javafx.animation.AnimationTimer;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;


public class FPS extends Application {
    public static void main(String[] args) { launch(args); }

    private static PerformanceTracker tracker;

    @Override
    public void start(Stage stage) {
        VBox root = new VBox(20);
        Label label1 = new Label();
        Label label2 = new Label();
        root.getChildren().addAll(label1, label2);

        Scene scene = new Scene(root, 200, 100);

        try {
            System.setProperty("prism.verbose", "true");
            System.setProperty("prism.dirtyopts", "false");
            //System.setProperty("javafx.animation.fullspeed", "true");
            System.setProperty("javafx.animation.pulse", "10");
        } catch (AccessControlException e) {}

        scene.setOnKeyPressed((e)->{
            label2.setText(label1.getText());
        });
        stage.setScene(scene);
        stage.show();


        tracker = PerformanceTracker.getSceneTracker(scene);
        AnimationTimer frameRateMeter = new AnimationTimer() {

            @Override
            public void handle(long now) {
                label1.setText(String.format("Current frame rate: %.3f fps", getFPS()));
            }
        };

        frameRateMeter.start();
    }

    private float getFPS () {
        float fps = tracker.getAverageFPS();
        tracker.resetAverageFPS();
        return fps;
    }

}