[A83] Re: Turn a piece of screen black

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Turn a piece of screen black
From: Hyperbyte <hyper@hysoft-automation.com>
Date: Mon, 25 Jun 2001 22:20:59 +0200 (CEST)
In-Reply-To: <000601c0fda6$fba70780$dc7874d5@qxd2j> from "Ronald Teune" at Jun 25, 2001 02:46:02 PM
Reply-To: assembly-83@lists.ticalc.org


> >Somebody knows how to turn a piece of screen black
> >with PLOTSSCREEN? This could be a stupid question,
> >but i'm a beginner.
> >If you know an other way that's also fine...
> 
> Copied from Hyperbyte's nifty (I hope you don't mind):

Why would I mind, I released the source ;-)

> 
> #define pxl_do(xxxx,yyyy) ld b,xxxx \ ld c,yyyy \ bcall(_ipoint)
> 
> pxl_do(94,2)
> 
> Other code snip:
> 
> >        cp 015h         ; AppVars, I presume
> 
> That's right
> 
> >        jp z,skip
> 
> jr is 1 byte smaller than jp and can be used in small forward jumps

Well, I must say, I never understood the fuzz about 1 byte more or less,
personally, I've never been short on 1 byte of memory :-)
I care more for code readability, but I still have much to learn in that 
direction. :-)


Besides, I've got 16 k to fill :-) 
I'll probably put in some texts about mathematics, an easter egg, and a 
Huffman compressed e-text reader.
Any more ideas?

--Peter Martijn
PS/1
Would there be great disadvantages to using appvars for temporal storage? --
 How do I check for available memory?


PS/2
(I do understand that replacing 500 jp's with jr's does matter!)

> 
> >        jp let_m_choose
> >
> >skip:
> 
> 
> 
>

References:

[A83] Re: Turn a piece of screen black

From: "Ronald Teune" <rtwolf@gmx.net>

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