Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.sys.acorn.programmer > #5920

Re: BBC BASIC - 'MODE MODE'

From druck <news@druck.org.uk>
Newsgroups comp.sys.acorn.programmer
Subject Re: BBC BASIC - 'MODE MODE'
Date 2019-12-09 16:19 +0000
Organization A noiseless patient Spider
Message-ID <qsls6t$c2j$1@dont-email.me> (permalink)
References <6da9459a-b85e-407d-80d9-2e271e6d459b@googlegroups.com> <581db42db9basura@invalid.addr.uk> <004cc11d58.Matthew@sinenomine.freeserve.co.uk>

Show all headers | View raw

On 05/12/2019 19:34, Matthew Phillips wrote:
> Not quite right.  MODE used as a function returns the current mode number,
> not the default mode.
> 
> MODE MODE
> 
> thus sets the mode to the current mode.  What is the point of that?  Well,
> the screen gets cleared and various things will be reset (not sure what --
> maybe graphics window, palette, etc.).

That's correct. If you want to run a non desktop program using the same 
resolution and colour depth as the desktop, you might think a mode 
change isn't necessary, but there are lot of things which the Wimp 
changes when in the desktop, which need resetting to the defaults. The 
MODE command resets these in one go, and to use the same resolution and 
colour depth as the desktop, MODE MODE can be used. The Wimp will also 
detect a mode change has occurred, and restore its settings on return to 
the desktop.

But bear in mind RISC OS's legacy graphics system, which a non desktop 
application will probably be using, is very dependent on colour depth 
(256 colours work differently from 2 to 16, and more than 256 colours 
needs newer APIs). So you might actually want to specify your mode 
requirements explicitly.

---druck

Back to comp.sys.acorn.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

BBC BASIC - 'MODE MODE' chasgpearce@gmail.com - 2019-12-05 06:16 -0800
  Re: BBC BASIC - 'MODE MODE' Martin <News03@avisoft.f9.co.uk> - 2019-12-05 15:20 +0000
    Re: BBC BASIC - 'MODE MODE' chasgpearce@gmail.com - 2019-12-05 08:08 -0800
  Re: BBC BASIC - 'MODE MODE' Richard Ashbery <basura@invalid.addr.uk> - 2019-12-05 17:11 +0000
    Re: BBC BASIC - 'MODE MODE' Matthew Phillips <spam2011m@yahoo.co.uk> - 2019-12-05 19:34 +0000
      Re: BBC BASIC - 'MODE MODE' druck <news@druck.org.uk> - 2019-12-09 16:19 +0000
  BBC BASIC - 'MODE MODE' fp53hxy@gmail.com - 2019-12-05 09:37 -0800
    Re: BBC BASIC - 'MODE MODE' Steve Fryatt <news@stevefryatt.org.uk> - 2019-12-05 20:44 +0000
      Re: BBC BASIC - 'MODE MODE' "John Williams (News)" <UCEbin@tiscali.co.uk> - 2019-12-05 21:01 +0000
      Re: BBC BASIC - 'MODE MODE' chasgpearce@gmail.com - 2019-12-06 05:03 -0800
        Re: BBC BASIC - 'MODE MODE' "John Williams (News)" <UCEbin@tiscali.co.uk> - 2019-12-06 14:07 +0000
          Re: BBC BASIC - 'MODE MODE' Matthew Phillips <spam2011m@yahoo.co.uk> - 2019-12-06 15:59 +0000

csiph-web