Drobe :: The archives
About Drobe | Contact | RSS | Twitter | Tech docs | Downloads | BBC Micro

Confirm comment report request

torbenm:

PDF is NOT a Turing-complete programming language. One of the main reasons for creating the PDF format is precisely that this "feature" of PS was considered a bad idea. PDF is a static description.

Secondly, PDF is by no means a variant of PostScript targetted towards on-screen viewing. PDF has been designed for all sorts of target devices: professional printing devices, pre-press work and also for on-screen viewing, but the latter is no more the focus of PDF than any other target. You could call PDF an extensible, object-based, static (i.e., NON-Turing-complete) variant of PostScript with additional structure imposed to allow random access to objects. If Adobe were to design it today, I doubt it would look much different.

PDF could be called less static than Draw (because it does not require each and every attribute to be specified for each object, but instead keeps a "current graphics state"), but the contents of a PDF page are still a sequence of graphical objects, just like a Draw description. It is also significantly more complex than Draw, simply because it does so much more and needs to support all sorts of professional printing features. Finally, it is stream-based, which makes it more difficult to manipulate, but this is the price you pay for all the flexibility.

 is a RISC OS Userwuerthne on 5/9/05 12:44PM
[ Reply | Permalink | Report ]

Click on the button below to confirm you wish to flag up this comment to the website's administrators. Abuse of this service will be frowned upon and it should only be used to notify us of comments that are extremely distasteful, indecent or otherwise unlawful. If you disagree with an opinion expressed or fact stated in a comment, please take part in the debate rather than expect it to be removed.

Return to the drobe.co.uk front page

Details

Reporting user / IP: / 3.231.229.89
Comment GID: 16566
Timestamp: Thu, 12 Dec 2019 11:30:48 +0000

Search the archives

Today's featured article

  • CDs Available
    Drobe Special Projects
     2 comments, latest by piemmm on 21/10/03 12:23PM. Published: 23 Jul 2003

  • Random article

  • The development of RiscX with author Leo White

     Discuss this. Published: 23 Dec 2000

  • Useful links

    News and media:
    IconbarMyRISCOSArcSiteRISCOScodeANSC.S.A.AnnounceArchiveQercusRiscWorldDrag'n'DropGAG-News

    Top developers:
    RISCOS LtdRISC OS OpenMW SoftwareR-CompAdvantage SixVirtualAcorn

    Dealers:
    CJE MicrosAPDLCastlea4X-AmpleLiquid SiliconWebmonster

    Usergroups:
    WROCCRONENKACCIRUGSASAUGROUGOLRONWUGMUGWAUGGAGRISCOS.be

    Useful:
    RISCOS.org.ukRISCOS.orgRISCOS.infoFilebaseChris Why's Acorn/RISC OS collectionNetSurf

    Non-RISC OS:
    The RegisterThe InquirerApple InsiderBBC NewsSky NewsGoogle Newsxkcddiodesign


    © 1999-2009 The Drobe Team. Some rights reserved, click here for more information
    Powered by MiniDrobeCMS, based on J4U | Statistics
    "So, if I had 'teased' you with spin you might have printed it. Instead because it was simply factual you decided not to"
    Page generated in 0.0491 seconds.