private void setRange(final double RANGE) {
        if (null == range) {
            _range = RANGE;
            setAngleStep(getAngleRange() / RANGE);
        } else {
            range.set(RANGE);
        }
    }
This is a private method that sets the range to the given value
which is always (maxValue - minValue).

@param RANGE
src/main/java/eu/hansolo/tilesfx/Tile.java