WrapAround is a convenience module which helps you perform calculations with points that are supposed to exist on a 2-dimensional, finite, unbounded plane. (Or infinite, bounded plane, depending on who you ask.) On such a plane, space wraps around so that an object travelling vertically or horizontally eventually comes back to the place where it started. This allows you to move objects around on a seamless map. For example, in some video games when an object crosses the bottom of the screen it reappears at the top.

WrapAround represents the points and handles the common calculations properly so you don't have to bother with the messy math and edge cases. This is done with two data structures: a WrapMap, which stores information about the size of the plane, and a WrapPoint, which stores information about the location of the point.

When you need the actual x, y coordinates, use the toCoords conversion function.

A WrapPoint is represented internally as a pair of angles, like in a torus. The WrapMap and WrapPoint structures are kept separate because some WrapPoint calculations can be performed without a WrapMap context. Functions typically only need a WrapMap when a WrapPoint must be converted to actual x, y coordinates or vice versa. Typically you do not want perform calculations with WrapPoints that were generated with different WrapMaps, but this is possible and sometimes useful.

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