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Groups > comp.sys.acorn.programmer > #5883

Re: Rotating a Colour-Filled Square

From Sebastian Barthel <naitsabes@freenet.de>
Newsgroups comp.sys.acorn.programmer
Subject Re: Rotating a Colour-Filled Square
Date 2019-11-16 19:47 +0000
Organization solani.org
Message-ID <qqpjns$cg4$3@solani.org> (permalink)
References (6 earlier) <5812df5497basura@invalid.addr.uk> <qqk9v8$ull$1@solani.org> <qqn8gi$q84$2@solani.org> <qqn90i$q84$3@solani.org> <5813da3ab9basura@invalid.addr.uk>

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Am Sat, 16 Nov 2019 14:05:10 +0000 schrieb Richard Ashbery:

> In article <qqn90i$q84$3@solani.org>, Sebastian Barthel
> <naitsabes@freenet.de> wrote:
>> Am Fri, 15 Nov 2019 22:23:14 +0000 schrieb Sebastian Barthel:
> 
>> > Am Thu, 14 Nov 2019 19:29:44 +0000 schrieb Sebastian Barthel:
>  
>> > And - to complete it a little bit more - here is the variant with
>> > TRIANGLEs as proposed by druck.
> 
> I seems Druck was right in that PLOTting with triangles is a much better
> solution and avoids the dreaded FILL command.

Yes, I agree.


In a time I had read about an HLine command or a PolyHLine command wich 
existed in RISC OS 6 and eventually others too. This could perform a 
little bit better, but in terms of simplicity combined with speed and 
"easiness" the TRINAGLE solution is probably the best.

 
> Just a few other points:
> 
> I only use my Raspberry Pi with res of 1920 x 1080. If I use your MODE
> (1280,1024,8) sure enough it works but I get severe breakup of the
> pattern. I've had to slow the shadow memory down somewhat by placing a a
> large (2cS) delay for MODE 1280,1024,8 and a much shorter delay for MODE
> 1920,1080,8 between SYS "OS_Byte",112,SCREENBANK% and CLG.

Strange. Has eventually something to do with a non-hardware SCREENBANK% 
switch. Old VIDC would be faster than this.


> Curious - what advantage is there in using SYS "OS_Plot" over plain old
> PLOT 85?


As I wrote for druck, its not a "real" reason. Its more because PLOT 
itself is unreadable for the "uninitiated" programmer - an that is 
clearer stated if "SYS OS_Plot" is used. So if You feel that PLOT looks 
better - use this.


> All we need now is some music - what about "The Blue Danube" by Strauss
> or something from Holst, "The Planets" ;-)

Strauss is already assigned with Elite and Odyssee 2001 ...
a little bit too big in comparison 

 
> Overall an extemely effective but simple pattern :-) Well done
> Sebastian.

Thanks.


All the best,
SBn

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Thread

Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-12 14:05 +0000
  Re: Rotating a Colour-Filled Square Sebastian Barthel <naitsabes@freenet.de> - 2019-11-12 23:04 +0000
    Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-14 16:24 +0000
      Re: Rotating a Colour-Filled Square Sebastian Barthel <naitsabes@freenet.de> - 2019-11-14 19:29 +0000
        Re: Rotating a Colour-Filled Square Sebastian Barthel <naitsabes@freenet.de> - 2019-11-15 21:26 +0000
        Re: Rotating a Colour-Filled Square Sebastian Barthel <naitsabes@freenet.de> - 2019-11-15 22:23 +0000
          Re: Rotating a Colour-Filled Square Sebastian Barthel <naitsabes@freenet.de> - 2019-11-15 22:31 +0000
            Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-16 14:05 +0000
              Re: Rotating a Colour-Filled Square Sebastian Barthel <naitsabes@freenet.de> - 2019-11-16 19:47 +0000
                Re: Rotating a Colour-Filled Square druck <news@druck.org.uk> - 2019-11-18 20:02 +0000
          Re: Rotating a Colour-Filled Square Steve Fryatt <news@stevefryatt.org.uk> - 2019-11-16 00:39 +0000
            Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-16 12:21 +0000
              Re: Rotating a Colour-Filled Square Steve Fryatt <news@stevefryatt.org.uk> - 2019-11-17 10:04 +0000
                Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-17 13:50 +0000
                Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-17 14:19 +0000
                Re: Rotating a Colour-Filled Square Steve Fryatt <news@stevefryatt.org.uk> - 2019-11-17 14:21 +0000
                Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-17 15:34 +0000
                Re: Rotating a Colour-Filled Square Steve Fryatt <news@stevefryatt.org.uk> - 2019-11-17 16:25 +0000
                Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-18 16:17 +0000
                Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-18 16:55 +0000
          Re: Rotating a Colour-Filled Square druck <news@druck.org.uk> - 2019-11-16 11:48 +0000
            Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-16 14:21 +0000
              Re: Rotating a Colour-Filled Square druck <news@druck.org.uk> - 2019-11-18 20:04 +0000
                Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-19 14:48 +0000
                Re: Rotating a Colour-Filled Square druck <news@druck.org.uk> - 2019-11-19 20:26 +0000
                Re: Rotating a Colour-Filled Square Brian Jordan <brian.jordan9@btinternet.com> - 2019-11-19 20:39 +0000
                Re: Rotating a Colour-Filled Square Dave <dave@triffid.co.uk> - 2019-11-20 07:50 +0000
                Re: Rotating a Colour-Filled Square Alan Adams <alan@adamshome.org.uk> - 2019-11-20 11:26 +0000
            Re: Rotating a Colour-Filled Square Sebastian Barthel <naitsabes@freenet.de> - 2019-11-16 19:27 +0000
              Re: Rotating a Colour-Filled Square Steve Fryatt <news@stevefryatt.org.uk> - 2019-11-16 23:37 +0000
      Re: Rotating a Colour-Filled Square druck <news@druck.org.uk> - 2019-11-14 20:47 +0000
    Re: Rotating a Colour-Filled Square druck <news@druck.org.uk> - 2019-11-14 20:44 +0000
      Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-15 13:35 +0000
        Re: Rotating a Colour-Filled Square Steve Fryatt <news@stevefryatt.org.uk> - 2019-11-16 00:32 +0000
    Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-13 12:54 +0000
      Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-13 17:05 +0000
        Re: Rotating a Colour-Filled Square Sebastian Barthel <naitsabes@freenet.de> - 2019-11-13 23:35 +0000
          Re: Rotating a Colour-Filled Square Sebastian Barthel <naitsabes@freenet.de> - 2019-11-14 12:20 +0000
          Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-14 14:09 +0000
  Re: Rotating a Colour-Filled Square Richard Ashbery <basura@invalid.addr.uk> - 2019-11-14 15:21 +0000
  Re: Rotating a Colour-Filled Square news@sprow.co.uk - 2019-11-14 05:00 -0800

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