Subject: Re: [stella] Ho ho ho #1 (Boing) From: "Clay Halliwell" <clay.h@xxxxxxxxxxxxxxxx> Date: Sat, 1 Jan 2000 16:06:49 -0600 |
Why blow memory on a vertical position table when you can just do it right with a physics-syle solution? You could add a second byte to the y-coordinate for fractional accuracy, and then it's as simple as (pseudo-code follows): // Simple vertical bounce // initialize ypos = 0 yvec = 0 yaccel = 1 ybouncestrength = -100 yfloor = 200 // main loop blitballatyposition(ypos) yvec = yvec - yaccel ypos = ypos + yvec if ypos > yfloor then ypos = yfloor yvec = ybouncestrength repeat Hmmm... I think that's right. Note that the constants are all wild guesses. -- Clay Halliwell | ATARI XL/XE DO + THE clay.FAKEMEAT.h@xxxxxxx | 8 - B I T S -------- e.halliwell@xxxxxxxxx | /////////// M A T H Keeper of the Atari Jaguar Cheats and Codes FAQ. Request your copy today! Editor, Jaguar Explorer Online - More Jaguar News Than Should Be Allowed! http://www.atarihq.com/jeo/ "Where do you want to play Atari today?" -----Original Message----- From: Rob <kudla@xxxxxxxxx> To: stella@xxxxxxxxxxx <stella@xxxxxxxxxxx> Date: Saturday, January 01, 2000 12:16 PM Subject: Re: [stella] Ho ho ho #1 (Boing) >At 01:11 PM 1/1/00 +0100, Piero Cavina wrote: >>Another nice touch would be a shadow for the ball. It shouldn't be >>difficult to add, as it would always stay below the ball at a fixed >>vertical position. > >Yeah, I like that! Can't remember whether the original Amiga version had it. > >I still might make the ball bounce the same way as the Amiga version (like >a ball bouncing with 100% elasticity), by using a table of vertical >positions instead of the Pong-like movement scheme I've got in there now. >The shadow thing would go great with that. > >Rob > >kudla@xxxxxxxxx ... http://kudla.org/raindog ... Rob > > >-- >Archives (includes files) at http://www.biglist.com/lists/stella/archives/ >Unsub & more at http://www.biglist.com/lists/stella/ -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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