public void produceSoundWave(int pos){
        soundWaves[pos] = new Circle(source.getTranslateX()+source.getCenterX(),source.getCenterY(),10, Color.TRANSPARENT);
        soundWaves[pos].setStroke(Color.BLACK);
        soundWaves[pos].setStrokeWidth(1.5);
        root_doppler.getChildren().add(soundWaves[pos]);
        waveIndex++;
    }