private final ZSamplePoint<TZ> closeSample(int x, int y) {
ZSamplePoint<TZ> A = sampleGrid.getOrCreate(x, y);
A.setZ(
metric.closeSample(
A.up() != null ? A.up().getZ() : null,
A.down() != null ? A.down().getZ() : null,
A.right() != null ? A.right().getZ() : null,
A.left() != null ? A.left().getZ() : null));
return A;
}
public final void addSamplingPoint(Coordinate C0, double z) {
if (closed) throw new IllegalStateException("Can't add a sample after closing.");
int[] xy = sampleGrid.getLowerLeftIndex(C0);
int x = xy[0];
int y = xy[1];
@SuppressWarnings("unchecked")
ZSamplePoint<TZ>[] ABCD = new ZSamplePoint[4];
ABCD[0] = sampleGrid.getOrCreate(x, y);
ABCD[1] = sampleGrid.getOrCreate(x + 1, y);
ABCD[2] = sampleGrid.getOrCreate(x, y + 1);
ABCD[3] = sampleGrid.getOrCreate(x + 1, y + 1);
for (ZSamplePoint<TZ> P : ABCD) {
Coordinate C = sampleGrid.getCoordinates(P);
P.setZ(metric.cumulateSample(C0, C, z, P.getZ()));
}
}
/** 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());
}