window-to-window-units

Arguments: from-window-or-screen to-window-or-screen position-or-box

Converts a position or a box that is in window units relative to from-window into window units relative to to-window. The position or box is destructively modified and returned.

Window units are measured in pixels rightward and downward from the interior upper left corner of a window. (Stream units, on the other hand, are measured from the origin of the conceptual "page" or "canvas" that is scrolled within a window, and may be scaled arbitrarily.)

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Created 2015.5.21.