In Delphi, the reserved word “interface” has two distinct meanings. In a Delphi unit, “interface” denotes the start of a unit section used to declare public constants, data types, variables, procedures and functions visible and accessible to other units using this unit. In OOP jargon, an “object interface” or simply “interface” is a kind of a class with no implementation (but not like a class with abstract methods). An interface defines methods that can be implemented by a class (a class “implements” the interface). Object interfaces might be used when multiple inheritance is needed, and are frequently used when working with COM objects. For some intro to interfaces: Interfaces in Delphi Programming 101.
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Partially Reimplementing / Overriding Interface Implementation
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I’m sure you’ve seen it already. When the program starts it takes a picture of the current desktop, the picture is then cut into a number of rectangular pieces (all of the same size). A piece at some random position is “removed”. The main code randomly swaps that piece with the one next to it. Only pieces adjacent to the removed one can be moved into it.