public String toJSONString() {
        return new StringBuilder().append("{")
                           .append("\"start\":").append(getStart()).append(",")
                           .append("\"stop\":").append(getStop()).append(",")
                           .append("\"color\":\"").append(getColor().toString().replace("0x", "#")).append("\",")
                           .append("\"highlightColor\":\"").append(getHighlightColor().toString().replace("0x", "#")).append("\",")
                           .append("\"active\":").append(isActive()).append(",")
                           .append("\"text\":\"").append(getText()).append("\",")
                           .append("\"textColor\":").append(getTextColor().toString().replace("0x", "#")).append("\"")
                           .append("}")
                           .toString();
    }
Checks if the section contains the given value and fires an event
in case the value "entered" or "left" the section. With this one
can react if a value enters/leaves a specific region in a gauge.
@param VALUE
src/main/java/eu/hansolo/tilesfx/Section.java