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Ok bare with me because I have no idea what this is actually called. If someone knows I will update the title. I am working on a site that will act as an out-of-game marketplace for in-game items. I want to ensure that the player is within the zone of the market in-game so I need an easy way to generate an array of valid coordinates the player could be within to access the market. Ideally i would like to run a function with a parameter specifying the radius of a square and another of the player's current geoID. Basic geometry would help if the geoID's were, in my mind, easier to predict.