Method ChildBeginAtLevel

s2/cellid.go:397–399

ChildBeginAtLevel returns the first cell in a traversal of children a given level deeper than this cell, in Hilbert curve order. The given level must be no smaller than the cell's level. See ChildBegin for example use.

(level int)

// Hilbert curve order. The given level must be no smaller than the cell's level.
// See ChildBegin for example use.
func (ci CellID) ChildBeginAtLevel(level int) CellID {
	return CellID(uint64(ci) - ci.lsb() + lsbForLevel(level))
}

// ChildEnd returns the first cell after a traversal of the children of this cell in Hilbert curve order.
// The returned cell may be invalid.