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 RipCutoff
 Get length of page used
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 Syntax

    RipCutoff() -> nCutoff

 Returns

    Length of the part of the current page that has been drawn on.

 Description

    Whenever the RIP draws anything on the page, it keeps track of the
    lowest point where it has drawn.  RipCutoff() returns the length of the
    page down to this point.  You can use it to save paper on roll-paper fax
    machines by cutting the page short (using RipEject()) if you have only
    used part of it.

 Example

    // Some machines do not like really short pages, so we'll make sure
    // it's at least four inches long, and a half-inch longer than it
    // needs to be to hold everything on the page.

    // Assume RipUnit(200), i.e. measuring in inches.

    RipEject(max(4, RipCutoff() + 1/2))