Plus one in calculating area of rectangle

I guess that plus one is just used to get the exact area. For example, width begin in pixel 2, end in pixel 4. The exact width is 3 (pixel 2, 3, 4). A 3 equals to 4 – 2 + 1.

But in my opion, it’s not essential to care about that. Just make sure you cal every area in the same standard.

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