center-to-box-x-y

Arguments: center-x center-y width height &key box

Returns a box whose center is at the position specified by center-x and center-y, and which has the specified width and height.

The box argument, if specified, should be either a box (see make-box) or nil. If a box, then that box is modified and returned. Otherwise a new box is created and returned.

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Created 2015.5.21.