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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