CoreandServices.book - Ocean - Schlumberger

extent, the last index is returned. -1 is returned if the extent is empty. Indexes into the
extent are zero-based.
Basics
Extent2 ext = new Extent2(new Index2 (1, 3), new Index2(4, 5));
//ext is [1 : 1 : 4, 3 : 1 : 7]
Index2 nearest = ext.NearestIndex(new Index2(3, 8));
// result is (2, 4)
Here the Extent2 has two arrays {1, 2, 3, 4} and {3, 4, 5, 6, 7}. In the first array, we are
looking for the value 3 and find it at index position 2. In the second array, we are looking
for the value 8, but it is is not there. It is beyond the end of the array, so the index
position returned is the last index position or 4. The result is (2, 4).
SnapValue – This method returns the nearest value in each Extent2 that falls on an
extent increment closest to the input values. The returned values can be outside the range
of the Extent2 objects.
Index2 begin = new Index2(3, 5);
Index2 size = new Index2(10, 10);
Index2 inc = new Index2(3, 5);
Extent2 ext = new Extent2(begin, size, inc);
//ext is [3 : 3 : 30, 5 : 5 : 50]
Index2 snap = ext.SnapValue(new Index2(13, 22));
//snap is (12, 10).
In this example, the output Index2 value has elements of 12 and 20. The value 13 falls
closest to the value 12 that is an even increment of the starting value of 3 and its
increment of 3. The value 22 falls closest to the value 20 that is an even increment of the
starting value of 5 and its increment of 5.
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