public float getWidth(IndexedZone z) {
return (z.getEndIndex() - z.getStartIndex() + 1) * zoneSize;
}
public float getUpper(IndexedZone z) {
if (z.getEndIndex() >= numZones) {
throw new IllegalArgumentException("Zone is out of bounds.");
}
return z.getEndIndex() * zoneSize + lower;
}