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Odyssey paper #04
11 января 1999 |
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Bysterenko! - the fastest algorithm / procedure for drawing a line.
Bysterenko!
____________
(C) Phantom Lord'97
We immediately thought of Suva from time to time
our algorithms, and today the air pass
fastovy algorithm for constructing a straight line
on the screen:
at the inlet
SP - A pointer to the address table screen
E - the smaller of the delta X and Y
D - the larger of the deltas
BC - offset X in the familiarity
A - D
SUB E
JR NC, $ +5
ADD A, D
POP HL
ADD HL, BC
SET 7, (HL)
SUB E
JR NC, $ +5
ADD A, D
POP HL
ADD HL, BC
SET 6, (HL)
SUB E
JR NC, $ +5
ADD A, D
POP HL
ADD HL, BC
SET 5, (HL)
SUB E
JR NC, $ +5
ADD A, D
POP HL
ADD HL, BC
SET 4, (HL)
SUB E
JR NC, $ +5
ADD A, D
POP HL
ADD HL, BC
SET 3, (HL)
SUB E
JR NC, $ +5
ADD A, D
POP HL
ADD HL, BC
SET 2, (HL)
SUB E
JR NC, $ +5
ADD A, D
POP HL
ADD HL, BC
SET 1, (HL)
SUB E
JR NC, $ +5
ADD A, D
POP HL
ADD HL, BC
SET 0, (HL)
INC L
INC C
Naturally, these pieces will be four. Also have a point count
entry and exit. But this should not make
big deal.
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