[A83] Re: Sprite Rotation?

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Sprite Rotation?
From: "Montana Rowe" <msphcpc_e_bsqo@hotmail.com>
Date: Sun, 20 Oct 2002 19:04:34 -0500
Reply-To: assembly-83@lists.ticalc.org

 





yeah, you could use sin,cos, and atan, but those only look good on a big
screen 

basically, for every pixel, you need: 

theta = atan2(x,y) 

r = (x^2 + y^2)^.5 

pixel_commad_on_or_off(sin(theta) * r, cos(theta) * r) 

very slow, even if you write your own routines and lookup tables for n^.5
andtrig functions, respectively >From: Gavin Olson >Reply-To:
assembly-83@lists.ticalc.org >To: assembly-83@lists.ticalc.org >Subject:
[A83] Re: Sprite Rotation? >Date: Fri, 18 Oct 2002 12:28:27 -0400 >>>You
meanangles other than 0/90/180/270? On an 83 screen, the sprites >would have
to be big to not turn into really bad looking stuff. You might >try using 8
pre-rendered sprites and selecting to draw the one that is the >appropriate
angle. >>At 06:11 PM 10/18/2002 +0200, you wrote: >>>Hello everybody,
>>>>Does someone know a rotation sprite routine, i.e. drawing the sprite in
a>>(e.g.) circular fashion? >>>>thx, >>>>Hasan 

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