Example usage for com.google.common.geometry S2CellId MAX_LEVEL

Introduction

In this page you can find the example usage for com.google.common.geometry S2CellId MAX_LEVEL.

Prototype

int MAX_LEVEL

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Usage

From source file:org.geosde.cassandra.GeometryTestCase.java

/**
 * Return a random cell id at the given level or at a randomly chosen level.
 * The distribution is uniform over the space of cell ids, but only
 * approximately uniform over the surface of the sphere.
 */// w  ww. j a  v a  2 s. c  o  m
public S2CellId getRandomCellId(int level) {
    int face = random(S2CellId.NUM_FACES);
    long pos = rand.nextLong() & ((1L << (2 * S2CellId.MAX_LEVEL)) - 1);
    return S2CellId.fromFacePosLevel(face, pos, level);
}

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From source file:org.geosde.cassandra.GeometryTestCase.java

public S2CellId getRandomCellId() {
    return getRandomCellId(random(S2CellId.MAX_LEVEL + 1));
}

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From source file:org.apache.lucene.spatial.prefix.tree.S2PrefixTree.java

/**
 * Get max levels for this spatial tree.
 *
 * @param arity The arity of the tree./*from   w  w  w .  ja  v  a 2s  .  c  o m*/
 * @return The maximum number of levels by the provided arity.
 */
public static int getMaxLevels(int arity) {
    return S2CellId.MAX_LEVEL / arity + 1;
}

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From source file:org.apache.lucene.spatial.prefix.tree.S2PrefixTreeCell.java

/**
 * Get the {@link S2CellId} from the {@link BytesRef} representation.
 *
 * @param ref The bytes.//from  ww w .j av  a2  s .c  om
 * @return the corresponding S2 cell.
 */
private S2CellId getS2CellIdFromBytesRef(BytesRef ref) {
    int length = ref.length;
    if (isLeaf(ref)) {
        length--;
    }
    if (length == 0) {
        return null; //world cell
    }
    int face = PIXELS.get(ref.bytes[ref.offset]);
    S2CellId cellId = FACES[face];
    long id = cellId.id();
    for (int i = ref.offset + 1; i < ref.offset + length; i++) {
        int thisLevel = i - ref.offset;
        int pos = PIXELS.get(ref.bytes[i]);
        // first child at level
        id = id - (id & -id) + (1L << (2 * (S2CellId.MAX_LEVEL - thisLevel * tree.arity)));
        // next until pos
        id = id + pos * ((id & -id) << 1);
    }
    return new S2CellId(id);
}

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