public Snapshot(ReadOnlyLongProperty idProvider, String title, String yAxisTitle) {
this(idProvider, title, yAxisTitle, null);
}
private void initialize() {
final CategoryAxis xAxis = new CategoryAxis();
final NumberAxis yAxis = new NumberAxis();
yAxis.setTickLabelFormatter(new NumberAxis.DefaultFormatter(yAxis, yUnit, null));
final LineChart chart = new LineChart(xAxis, yAxis);
chart.setLegendVisible(false);
chart.setTitle(title);