Re: Test for nocurrentpoint

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#1175

From: C.E. Thompson
Date: Tue, 10 Oct 1989 20:06

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In article <3439@daimi.dk>, erja@daimi.dk (Erik Jacobsen) writes:
> How can I test if there is no currentpoint, or the current path
> is empty? I would like something like this:
>
>          thereisacurrentpoint { pathbbox ..... }
>                               { .....          } ifelse

Nice question! The best I can come up with is

/thereisacurrentpoint {
  mark false {cleartomark mark true} dup dup dup pathforall
  exch pop } def

(Using the marks is just a way of being able to use the same procedure
for all four arguments to 'pathforall'.)

Chris Thompson
JANET:    cet1@uk.ac.cam.phx
Internet: cet1%phx.cam.ac.uk@nsfnet-relay.ac.uk

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References: <3439@daimi.dk>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!ginosko!uunet!mcsun!ukc!cam-cl!cet1
From: cet1@cl.cam.ac.uk (C.E. Thompson)
Newsgroups: comp.lang.postscript
Subject: Re: Test for nocurrentpoint
Message-ID: <1238@scaup.cl.cam.ac.uk>
Date: 10 Oct 89 20:06:19 GMT
References: <3439@daimi.dk>
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Reply-To: cet1@cl.cam.ac.uk (C.E. Thompson)
Organization: U of Cambridge Comp Lab, UK
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