IzhNews #02 03 января 2000

Программирование

Coder - rather prostyatsky and not the optimal method for deriving the sprite on the screen.

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_


            -= Kodera =

(C) NoViSeT

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_

      Novice coders dedicated.


               Introduction.


   Hello to you beginners the most beautiful language 
programming on the whole world. If you decided to link

my life (or part thereof) with programming in Assembler, you 
did true test of choice, because before you open the magic of 
the commands that you you can apply for the benefit of mankind 
and modern perhaps very soon you'll be able to be as it is 
fashionable now to speak Elit'oy Scen'y. But know until this 
moment to be against you is full of complexities and

hazards, and only few people reach the finish ...


   Mean more to the point ... In this section
will be discussed in virtually all matters
are associated with programming in assembler,
its capabilities, commands, and techniques to apply them. And 
if you think you have grasped this interesting language, you 
just should, or should I say obliged to share

with our readers. And if you have
questions, then you should definitely ask them, and we will try 
to answer. But if do not look out the right answer, I

I hope the world can we in it razobratsya and help ...


   And so immediately in this issue, I would
wanted to tell all the suffering and interested in a pretty and 
very prostyatsky not the optimal method for deriving the sprite 
on the screen. 


    .......

SPR LD DE, 256, specifies the offset

    LD IX, 16384; ask the address in display; om file

    LD A, 3; the size of the sprite in the Y
; Familiarity
L3 PUSH AF

    LD B, 3; the size of the sprite in the X
; Familiarity
L2 PUSH BC

    PUSH IX

    LD B, 3
L1 LD A, (HL)

    LD (IX), A

    INC HL

    ADD IX, DE; add an offset

    DJNZ L1

    POP IX

    INC IX

    POP BC

    DJNZ L2

    LD BC, 29; the transition to the next line

    ADD IX, BC; in BC given 32-X, ie in
; Line 32 character subtract from them the size of
; Sprite X

    POP AF

    DEC A

    JR NZ, L3; go to print the following; ing line

    ......

 Here is a protsedurka, if you know a faster method or method 
of deriving the sprite to within one pixel, then please

us and tell us about it.