Author: Christophe Theron
Date: 20:10:51 06/13/00
Go up one level in this thread
On June 13, 2000 at 17:06:57, Tom Kerrigan wrote:
>On June 13, 2000 at 16:10:05, Christophe Theron wrote:
>
>>With the other approach, you need a table lookup to tell that the square is not
>>inside the board:
>>
>> // 12x12 way:
>> if (board[square]==-1) it_is_outside;
>> else it_is_inside;
>
>If your board starts out being 12x12, then you're right, it doesn't really make
>a difference if you switch to 0x88.
>
>However, I know that a number of programs use an 8x8 board. To do the bounds
>testing, they convert the 8x8 offset into a 10x12 offset and then back again.
>You can see this done in TSCP. This method is obviously a loser compared to
>0x88.
I don't really understand why you would use a 8x8 board if you use 12x12
coordinates or the opposite...
Actually I'm using 16x16 coordinates, so I shouldn't have mentionned 12x12 or
12x10, but just 16x16 (well actually I just need 16x12).
I think 16x16 is more efficient than 0x88 and I explained why. And it is much
simpler to understand than 0x88 BTW! The way you test the out of bound condition
in 0x88 is great, but that's the only advantage of this system, and as I
explained nobody cares for this test most of the time!
Christophe
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