Note: if this object is not {@link DirectPointSetPattern}and is not {@link RectangularPattern}, this method can work slowly for some large patterns: the required time can be O(N), where N is the number of points. In these cases, this method can also throw {@link TooManyPointsInPatternError}or OutOfMemoryError. The situation is like in {@link #points()} and {@link #roundedPoints()} method.However, this situation is possible only in custom implementation of this interface — all implementations, provided by this package, implement either {@link DirectPointSetPattern}or {@link RectangularPattern} interface. @return the "boundary" of this pattern: new pattern consisting of all points of this pattern,which have no leftward or rightward neighbour along at least one coordinate. @throws TooManyPointsInPatternError (impossible for implementations, provided by this package)if this pattern is not {@link DirectPointSetPattern} andnot {@link RectangularPattern} and if, at the same time, the numberof points is greater than Integer.MAX_VALUE or, in some rare situations, is near this limit (OutOfMemoryError can be also thrown instead of this exception).
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