Re: A86: Re: Sprites and the Screen
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Re: A86: Re: Sprites and the Screen
>From: ZeromusMog@aol.com
>Date: Sat, 6 Feb 1999 12:01:59 EST
>To: assembly-86@lists.ticalc.org
>Subject: Re: A86: Re: Sprites and the Screen
>Reply-To: assembly-86@lists.ticalc.org
>
>
>In a message dated 2/5/99 10:48:50 PM Pacific Standard Time,
david@acz.org
>writes:
>
>> It all depends on what FindPixel, FindAddress or PutSprite routine
you are
>> using! It is normally the upper left, but on the 85 I believe the
>> FIND_PIXEL rom call made it lower the right. If the coords are
reversed,
>> than that's the fault of your PutSprite routine. Remember, X is
>horizontal,
>> Y is vertical. They refer to the standard cartessian coordinate
plane
>> (remember Algebra?)
>
>Yes, but what quadrant is it in? I, II, III, or IV? Many graphics
programs
>start X and Y from the upper left corner, which is Quadrant IV...
>
>
Actually the upper left corner is quadrant II . . .
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