protected List refreshAngleTicks() {
List ticks = new ArrayList();
for (double currentTickVal = 0.0; currentTickVal < 360.0;
currentTickVal += this.angleTickUnit.getSize()) {
TextAnchor ta = calculateTextAnchor(currentTickVal);
NumberTick tick = new NumberTick(new Double(currentTickVal),
this.angleTickUnit.valueToString(currentTickVal),
ta, TextAnchor.CENTER, 0.0);
ticks.add(tick);
}