A85: Accessing bits
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A85: Accessing bits
Let's say I have a byte stored in my ZShell program like this:
SomeByte:
.db %10110110
How would I split that number up to this:
10-11-01-10
(Four new binary numbers ranging from 0 to 3)
so that I could compare each segment to a value?
My map algorithm for the game I'm working on requires that I be able to
make these comparisons. The game I'm working on is an RPG and I would
have to use this for drawing and finding the clipping values of each
room. For clipping, here are the 4 numbers you would want to compare:
Each room is box shaped and you can move up, down, left, or right. Here
are how the bits are organized:
00000000 <- This is the binary number
12345678 <- Here is the order of the bit values
1 and 2, left clipping value
3 and 4, right clipping value
5 and 6, top clipping value
7 and 8, bottom clipping value
00 You can walk through this anytime.
01 Locked, a key is required
10 Locked, you must defeat a certain boss
11 You can not walk through this under most circumstances
So I how would I tell if I could walk through the top of the room I were
in?
Sorry if this is somewhat confusing. It took me a month to come up with
this and the clipping values are probably the least complex of the four
bytes that make up each individual room.
egillespie@juno.com
erik_gillespie_1096@gwgate.kvcc.edu
"In a prototypical world, nothing ever goes wrong." -Scott Meyers
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