1.4 Spread point arguments to functions

Many functions that take point arguments come in two forms: structured and spread. Functions that take structured point arguments take the argument as a single point object. Functions that take spread point arguments take a pair of arguments that correspond to the x and y coordinates of the point.

Functions that take structured point arguments, or return structured point values have an asterisk in their name, for example, draw-line*.

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Functional Developer Library Reference: DUIM - 3 Dec 1998