[stella] Re: P2C+Cartesian to Polar = Full Co-ordinate Conversion

["Andrew Wallace" <apeboy@xxxxxxxxxxxxxxx>]

Roger Williams writes: 

> This demonstrates full co-ordinate conversion.  You "drive"
> a familiar looking tank around a baseball field made up of
> the other player, ball, and missiles.  The resolution is
> execrable because it's only good to 1 in 64 and there are
> three conversions involved in locating an object, so the
> errors propagate.  This can be solved, at the expense of
> some clock cycles (next project!).  Single-pixel resolution
> (at least at the level of this demo) should be possible. 
>
> You could adapt this code readily to 3D, but the errors
> would be even worse.  With an extension to 10-bit angles
> that should become acceptable (though at some cost on
> the timing) 
>
> My P2C demo had been anticipated by Gyruss, though
> used a brute-force table in a paged 8K game to do what
> I did in about 1.5K.  That wouldn't work with this.  I don't
> think it's ever been done on Stella, even at this limited level.
> If it has I'd be *very* interested in hearing about it,
> because I'm actually starting to get the itch to make a
> playable game out of this idea. 
>
> --Roger Williams 
>
> P.S. These conversion routines are useful in many contexts
> and I'm not jealous of them.  One interesting
> project would be to add fine motion control to Combat.
> I may do that if no one else is interested just as a practice
> exercise.  I've put them in the public domain, if you feel you
> could use them please do.

This is looking good, having the whole environment move around the player 
like this gives a much better illusion of movement than moving the tank 
would. 

I hope you can come up with a workable idea to extend this into a complete 
game. 

Andrew 
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