@Override
    public void setScene(){

        dopplerAnimationScene = new Scene(root_doppler, sceneWidth, sceneHeight);
        setGraph();
        setButtonEvent();
        setTimelineEvent();
        setDragEvent();
        
        buttonGroup_doppler.getChildren().addAll(inputVelocitySource,sourceVelocityUnits,inputVelocityObserver,observerVelocityUnits,inputFrequency_doppler,frequencyUnits_doppler,startButtonDoppler,pauseButtonDoppler,resetButtonDoppler,backButtonDoppler);
        buttonGroup_doppler.setSpacing(10);
        buttonGroup_doppler.setPadding(new Insets(10,10,10,10));
        
        inputVelocitySource.setPromptText("Enter velocity of the source");
        inputVelocityObserver.setPromptText("Enter velocity of the observer");
        inputFrequency_doppler.setPromptText("Enter Frequency");
        
        root_doppler.getChildren().addAll(source,observer);
        root_doppler.setTop(buttonGroup_doppler);
    }