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Groups > comp.sys.acorn.programmer > #154

Re: Weird scaling bug - any ideas ?

From Martin Wuerthner <spamtrap@mw-software.com>
Newsgroups comp.sys.acorn.programmer
Subject Re: Weird scaling bug - any ideas ?
Date 2011-04-05 21:59 +0200
Organization MW Software
Message-ID <48f052bf51.martin@bach.planiverse.com> (permalink)
References <31efb046-01a1-4bb9-a833-d897cf321997@r14g2000vbm.googlegroups.com>

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In message <31efb046-01a1-4bb9-a833-d897cf321997@r14g2000vbm.googlegro 
ups.com>
          Martin Hansen <mhh@shrewsbury.org.uk> wrote:

> Dear All,
> I'm trying to get to the bottom of a long standing bug in one of my
> programs.
> I'll describe the symptoms...
> From a clean start I open an !Edit window, and type in some stuff.
> I launch the program that contains the bug.
> With it on the Icon bar, all is well.
> I open a window containing a sprite.
> The text in the !Edit window (if I refresh it by dragging a window
> over it) is now half size.
> On the one hand, this is trivial, on the other, it means there is
> something about my program I don't understand, and it's bound to cause
> other problems a have not
> unearthed yet.

That sounds like your program upsets the VDU system. Are you using any 
VDU calls in your program? How do you plot the sprite?

-- 
Martin
---------------------------------------------------------------------
Martin Wuerthner         MW Software      http://www.mw-software.com/
        RISC OS Software for Design, Printing and Publishing
---------------------------------------------------------------------

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Thread

Weird scaling bug - any ideas ? Martin Hansen <mhh@shrewsbury.org.uk> - 2011-04-05 12:28 -0700
  Re: Weird scaling bug - any ideas ? Martin Wuerthner <spamtrap@mw-software.com> - 2011-04-05 21:59 +0200
    Re: Weird scaling bug - any ideas ? Martin Hansen <mhh@shrewsbury.org.uk> - 2011-04-05 17:30 -0700
      Re: Weird scaling bug - any ideas ? Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-04-06 05:23 +0200
        Re: Weird scaling bug - any ideas ? Martin Hansen <mhh@shrewsbury.org.uk> - 2011-04-06 02:23 -0700
          Re: Weird scaling bug - any ideas ? Martin <News03@avisoft.f9.co.uk> - 2011-04-06 10:53 +0100
            Re: Weird scaling bug - any ideas ? Martin Hansen <mhh@shrewsbury.org.uk> - 2011-04-06 03:59 -0700
              Re: Weird scaling bug - any ideas ? Martin Wuerthner <spamtrap@mw-software.com> - 2011-04-06 14:50 +0200
                Re: Weird scaling bug - any ideas ? Martin Hansen <mhh@shrewsbury.org.uk> - 2011-04-06 09:31 -0700
                Re: Weird scaling bug - any ideas ? Steve Fryatt <news@stevefryatt.org.uk> - 2011-04-06 18:19 +0100
                Re: Weird scaling bug - any ideas ? Martin Wuerthner <spamtrap@mw-software.com> - 2011-04-07 13:14 +0200
                Re: Weird scaling bug - any ideas ? Martin Hansen <mhh@shrewsbury.org.uk> - 2011-04-07 09:49 -0700
          Re: Weird scaling bug - any ideas ? Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-04-06 14:23 +0200
          Re: Weird scaling bug - any ideas ? Steve Fryatt <news@stevefryatt.org.uk> - 2011-04-06 18:20 +0100
  Re: Weird scaling bug - any ideas ? Gerph <gerph@gerph.org> - 2011-04-09 05:06 -0700

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