/** Surround all existing samples on the edge by a layer of closing samples. */
public final void close() {
if (closed) return;
closed = true;
List<ZSamplePoint<TZ>> processList = new ArrayList<ZSamplePoint<TZ>>(sampleGrid.size());
for (ZSamplePoint<TZ> A : sampleGrid) {
processList.add(A);
}
int n = 0;
for (int i = 0; i < 2; i++) {
List<ZSamplePoint<TZ>> newProcessList = new ArrayList<ZSamplePoint<TZ>>(processList.size());
for (ZSamplePoint<TZ> A : processList) {
if (A.right() == null) {
newProcessList.add(closeSample(A.getX() + 1, A.getY()));
n++;
}
if (A.left() == null) {
newProcessList.add(closeSample(A.getX() - 1, A.getY()));
n++;
}
if (A.up() == null) {
newProcessList.add(closeSample(A.getX(), A.getY() + 1));
n++;
}
if (A.down() == null) {
newProcessList.add(closeSample(A.getX(), A.getY() - 1));
n++;
}
}
processList = newProcessList;
}
LOG.info("Added {} closing samples to get a total of {}.", n, sampleGrid.size());
}
