@Override protected void invalidated() {
                    set(clamp(0, 5, get()));
                    formatString = new StringBuilder("%.").append(get()).append("f").toString();
                    redraw();
                }
Defines the number of decimals that will be used to format the values in the tooltip
@param DECIMALS
src/main/java/eu/hansolo/tilesfx/chart/SunburstChart.java