/**
* recursive method to find nearest item in this layer (or any layer it contains).
*
* @param pl the one we want to be near to
* @param nearest the place to put the results
*/
private void findNearest(final Plottable pl, final dataStruct nearest) {
if (pl.getVisible()) {
// is this a layer?
if (pl instanceof Layer) {
// do the check for this item
// NOTE: we only check the distance of elements, not whole tracks
// nearest.compare(pl);
// we need to call ourselves for each layer inside it
final Layer l = (Layer) pl;
final java.util.Enumeration<Editable> enumer = l.elements();
while (enumer.hasMoreElements()) {
Editable next = enumer.nextElement();
if (next instanceof Plottable) {
final Plottable this_plottable = (Plottable) next;
findNearest(this_plottable, nearest);
}
}
} else {
// so, we've got to a node - compare it to our current data
nearest.compare(pl);
}
}
}
/**
* compare method, is this new plottable nearest than the current one.
*
* @param newPl the item we're looking at
*/
private final void compare(final Plottable newPl) {
// is it even visible?
if (!newPl.getVisible()) return;
// calculate the range
final double range = newPl.rangeFrom(location);
// did it produce a valid range?
if (range == Plottable.INVALID_RANGE) {
return;
}
// so, we have a valid range. is it our first?
if (distance == Plottable.INVALID_RANGE) {
object = newPl;
distance = range;
} else {
if (range < distance) {
distance = range;
object = newPl;
}
}
}
public int compareTo(final Plottable arg0) {
final Plottable other = (Plottable) arg0;
return this.getName().compareTo(other.getName());
}