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From: Richard Ashbery <basura@invalid.addr.uk>
Newsgroups: comp.sys.acorn.programmer
Subject: Re: Instability in rectangular cursor
Date: Fri, 13 Nov 2020 17:12:44 +0000 (GMT)
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In article <rom466$13m9$1@gioia.aioe.org>, Steve Drain
<steve@kappa.me.uk> wrote:
> On 13/11/2020 13:17, Richard Ashbery wrote:

> > The mouse overlays another horizontal rectangle but in so doing
> > results in instability and spoils the rendering. Any solutions
> > would be welcome.

> I am not sure I get what you want, but you could try a WAIT before
> one or both the RECTANGLE statements.

Thanks for responding.

You make a fair point and although WAIT does work in this example it
dramatically slows down the program that this code has been ripped from.
Please have a look at...

http://www.riscosbasic.uk/problems/Kill_verticals.zip

Unfortunately the program is not named but I believe it may have been
created by Krzysztof Jankowski and can be found on YouTube. The
original program was done in MODE 28 but I wanted to see if I could
convert it for 1080p monitors. Original mouse cursor has instability
issues but these are magnified in 1920 x 1080 modes.

Scoring logic appears slightly odd - it takes a very short time to build
up a huge score - this may require tweaking.

Regards

Richard