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Re: SWI / BASIC command to read number of Pixels in a screen mode

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The following bytes were arranged on 27 Sep 2011 by Michael :

> DIM b% 8
> b%!0 = 11
> b%!4=-1
> SYS "OS_ReadVduVariables",b%,b%
>
> width% = b%!0
>
> b%!0 = 12
>
> SYS "OS_ReadVduVariables",b%,b%
>
> height% = b%!0

That's still two calls to the SWI, which is unnecessary because it's not
OS_ReadModeVariable and can return values for more than one variable at
once.  See my earlier post.

Variables 11 and 12 are values in pixels, not used by any RISC OS
plotting routine.  You need the eigen-factors, variables 4 and 5, as
well, to convert them to OS units.

-- 
  __<^>__   "Your pet, our passion." - Purina
 / _   _ \  "Your potential, our passion." - Microsoft, a few months later
( ( |_| ) )
 \_>   <_/  ======================= Martin Bazley ==========================

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Thread

SWI / BASIC command to read number of Pixels in a screen mode Michael <michaelremerton@gmail.com> - 2011-09-27 14:49 -0700
  Re: SWI / BASIC command to read number of Pixels in a screen mode Alex Macfarlane Smith <nospam@archifishal.co.uk> - 2011-09-27 22:51 +0100
    Re: SWI / BASIC command to read number of Pixels in a screen mode Michael <michaelremerton@gmail.com> - 2011-09-27 15:02 -0700
      Re: SWI / BASIC command to read number of Pixels in a screen mode Michael <michaelremerton@gmail.com> - 2011-09-27 15:18 -0700
        Re: SWI / BASIC command to read number of Pixels in a screen mode Martin Bazley <martin.bazley@blueyonder.co.uk> - 2011-09-27 23:36 +0100
      Re: SWI / BASIC command to read number of Pixels in a screen mode Martin Bazley <martin.bazley@blueyonder.co.uk> - 2011-09-27 23:34 +0100
        Re: SWI / BASIC command to read number of Pixels in a screen mode Michael <michaelremerton@gmail.com> - 2011-09-27 16:10 -0700
    Re: SWI / BASIC command to read number of Pixels in a screen mode Martin Bazley <martin.bazley@blueyonder.co.uk> - 2011-09-27 23:19 +0100
      Re: SWI / BASIC command to read number of Pixels in a screen mode Michael <michaelremerton@gmail.com> - 2011-09-27 16:14 -0700
        Re: SWI / BASIC command to read number of Pixels in a screen mode Steve Drain <steve@kappa.me.uk> - 2011-09-28 11:33 +0100
          Re: SWI / BASIC command to read number of Pixels in a screen mode Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-09-28 17:27 +0200
          Re: SWI / BASIC command to read number of Pixels in a screen mode Michael <michaelremerton@gmail.com> - 2011-09-28 18:57 -0700
        Re: SWI / BASIC command to read number of Pixels in a screen mode Gazza <usenet@garethlock.com> - 2011-10-18 16:12 -0700
          Re: SWI / BASIC command to read number of Pixels in a screen mode "Ste (news)" <steve@revi11.plus.com> - 2011-10-25 14:33 +0100
      Re: SWI / BASIC command to read number of Pixels in a screen mode Martin Wuerthner <spamtrap@mw-software.com> - 2011-09-28 10:47 +0200
        Re: SWI / BASIC command to read number of Pixels in a screen mode Steve Drain <steve@kappa.me.uk> - 2011-09-28 12:02 +0100
          Re: SWI / BASIC command to read number of Pixels in a screen mode Steve Drain <steve@kappa.me.uk> - 2011-09-28 12:09 +0100
            Re: SWI / BASIC command to read number of Pixels in a screen mode "Ste (news)" <steve@revi11.plus.com> - 2011-09-28 15:13 +0100
              Re: SWI / BASIC command to read number of Pixels in a screen mode Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-09-28 17:36 +0200
                Re: SWI / BASIC command to read number of Pixels in a screen mode Steve Drain <steve@kappa.me.uk> - 2011-09-28 17:32 +0100
        Re: SWI / BASIC command to read number of Pixels in a screen mode Martin <News03@avisoft.f9.co.uk> - 2011-09-28 12:55 +0100
        Re: SWI / BASIC command to read number of Pixels in a screen mode Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-09-28 17:34 +0200
      Re: SWI / BASIC command to read number of Pixels in a screen mode Gazza <usenet@garethlock.com> - 2011-10-18 16:10 -0700
        Re: SWI / BASIC command to read number of Pixels in a screen mode Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-10-19 06:49 +0200
          Re: SWI / BASIC command to read number of Pixels in a screen mode Steve Drain <steve@kappa.me.uk> - 2011-10-19 10:19 +0100
          Re: SWI / BASIC command to read number of Pixels in a screen mode Erik G <erikg@noname.invalid> - 2011-10-19 15:24 +0200
            Re: SWI / BASIC command to read number of Pixels in a screen mode Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-10-19 19:47 +0200
              Re: SWI / BASIC command to read number of Pixels in a screen mode druck <news@druck.org.uk> - 2011-10-19 20:36 +0100
                Re: SWI / BASIC command to read number of Pixels in a screen mode Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-10-20 17:40 +0200
                Re: SWI / BASIC command to read number of Pixels in a screen mode druck <news@druck.org.uk> - 2011-10-20 20:13 +0100
  Re: SWI / BASIC command to read number of Pixels in a screen mode Chris Johnson <chrisjohnson+news@spamcop.net> - 2011-09-27 23:21 +0100
  Re: SWI / BASIC command to read number of Pixels in a screen mode Bryan Hogan <spam@nowhere.invalid> - 2011-09-28 01:49 +0100
    Re: SWI / BASIC command to read number of Pixels in a screen mode Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-09-28 18:22 +0200
      Re: SWI / BASIC command to read number of Pixels in a screen mode Michael <michaelremerton@gmail.com> - 2011-09-28 19:12 -0700
        Re: SWI / BASIC command to read number of Pixels in a screen mode "Ste (news)" <steve@revi11.plus.com> - 2011-09-29 12:42 +0100
          Re: SWI / BASIC command to read number of Pixels in a screen mode Steve Drain <steve@kappa.me.uk> - 2011-09-29 16:14 +0100
            Re: SWI / BASIC command to read number of Pixels in a screen mode "Ste (news)" <steve@revi11.plus.com> - 2011-09-30 00:12 +0100
              Re: SWI / BASIC command to read number of Pixels in a screen mode Steve Drain <steve@kappa.me.uk> - 2011-09-30 10:48 +0100

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