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ZX Pilot #38
31 мая 2000 |
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Coding - write a simple news ticker.
C O D I N G
(C) Z-ZERO
In order to dispel ignorance,
Split ignorance and darkness -
Take a picture of the universe,
And stupid we look, what's what ...
Brothers Strugatsky
"Monday begins
on Saturday. "
"... It's just Marasmus!
Z-Zero SYSTEMS inc.
O-e-s! What am I, he wondered, was the clever phrases
raskidyvatsya? God forbid a the night is! In other matters
clever phrases and so good that they're smart ... Stop, stop,
stop! Imagine how (well, we assume, Sergius
Puzzler) raised his hands to heaven, with a prayer ... Well,
something in the style: "Again!" Or anyone else, but with the
words: "Etis you - a failure!" I have them chudestno
understand, but when the "itching" - should be given
yield to emotions, that meanders not overheated!
OOPS! I forgot what vacancies section!
Get started!
Every time I open the next,
taken from priyatelelya do not know how many times,
Room Revyuhi - I shudder with horror! You know, it seems that
it engaged in drafting or rebyatnya from elementary school or
full marazmatik. "Well All right, "- someone will say of the
matter coder'ov - for us this is the last century." Well for
you it might be the last, and for your neighbor (brother,
friend - the right highlight) everything is just beginning, and
he too reads the newspaper and thereby shall not throw
rotten eggs ...
God forgive me ... (Does anyone forgive)
but I'll take today's conversation about "lines - begulkah", or
rather their foundations, principles, and sizes.
All running lines are divided into four
form:
- The simplest with the conclusion of familiarity,
rolliruyuschiesya either, but each new letter
appears from the bay floundering, or derived
the invisible familiarity.
- Standard with varying size
letters, and the way O (scr / attr).
- Complicated. Can be very unpredictable effects such as
sin'usoida, jump series, outlining the subject of on-screen
(see my version of War In Middle Earth " it can be ordered from
me (mouse)), moving in a stream of water, precipitation from
the bag and much else, just do not go bust.
- Ultra sophisticated. At this level you can
include running stitch, which is used to create the border,
scaling a vector of letters, creating lines MuLtIcOlOr'nymi
effects.
All the above listed will be considered in
our digression. For some it becomes a kind of textbook, and
someone fairly ponostalgiruet about the past.
Simple.
This is the simplest form of running stitches, and he
realized as follows: program print byvodit line from the address
# XXXX, at # YY letters. Produced a delay
by HALT'a or withdrawal of the sprite (s). Incremented
beginning of the text. Checked on his end, and if so - set #
XXXX at the beginning and move into beginning of the paragraph.
If not end, just Go to the beginning of the paragraph.
Or another option, which otlichaestsya
from the previous one, which displays not all
line and only the next letter, and then
is 8 (16, 32, 64 ...) rolling. After
that all the standard scheme-checking
the end of the cycle.
After reading this paragraph, some of the newbies who are on
the front ASSEMBLER'nom exclaim:
- Did not stick familiarity -
invisibility, and at the limit?
The answer is - NOT! Primarily because
it would be bad form, and secondly,
Imagine that you draw this nonsense in
frame in the center of the screen ... br-rr!
Standard.
Arrived! That's because of that I gave
all this fuss is about. Take a look at any issue of ZX-REVIEW,
and you will find darkness standard lines, each of which claims
to be conciseness and ease of execution, but everywhere there
is a lot of variables koi must be filled, so this whole circus
began to dance Now look at them and show size'y
me one more or less short!?
One gets the impression that we have a country
innovators, inventors bike
(Shaw Ride - then I think)! "The beginning of a line
specified in pixel koordinatatah ... "
Or again: "The beginning of a line is calculated ...",
and then goes on a program BASIC'e, rows
such things at 200. That laugh was so
(Where - I do not remember). This means in order that we may
know where this is I pritknul line, it is necessary to fill a
hefty prog and an hour and a half wait, that prog report
something like: "You lain disposet of sistem varaibles! "In
short, 107-byte line and ready to ...
ORG # 61A8
INIT LD HL, TXT
LD (TEKST), HL; initializer text
INIT2 LD A, # 01
LD (TEKBY), A; Reset bit
RET
SYM LD HL, (TEKST)
LD A, (HL)
CP # FF
RET Z
INC HL
LD (TEKST), HL
LD L, A
LD H, # 2000
ADD HL, HL
ADD HL, HL
ADD HL, HL
LD DE, FONT-# 0100
ADD HL, DE
LD (TEKSY), HL; address of the current. symbol
RET
LETER LD HL, (TEKSY)
LD DE, # 4073; left edge of the text
LD C, # 08; character height (MAX8)
PIP2 RLC (HL)
PUSH DE
EX DE, HL
LD B, # 08; length of the string
PIP1 RL (HL)
DEC HL
DJNZ PIP1
EX DE, HL
POP DE
INC HL
INC D
DEC C
XOR A
OR C
JR NZ, PIP2
RET
STEPS LD A, (TEKBY)
CP # 09; bit counter
JR NC, NEXT; output by the end of the letter
STEPSES CALL LETER
LD A, (TEKBY)
INC A
LD (TEKBY), A
LD B, # 02
HALT
DJNZ $
RET
NEXT CALL SYM; new letter
CALL Z, INIT; Text ended
JR Z, NEXT
CALL INIT2; not the end, reset. bat
JR STEPSES
TEKST DEFW FONT-1 pointer to # FF bytes
TEKSY DEFW # 0000 Address of the current letter in the
; Fonte
TEKBY DEFB # 09; bit counter, the first
; Startup 9.
; Text Message
TXT DEFM "In a small marazmatiruem?"
DEFB # FF
FONT INCBIN "font"; Font, not ROM!
For each of the next step lines (in
including the first) do CALL STEPS.
In the "left edge of the text, the address of the left edge
of the line up to familiarity. The line "string length"
to indicate its length in familiarity. Everything!
The simplest line of crawling on your screen, if the rate is
low - remove HALT.
For symmetry allow bowed.
To be continued ...
Alex Merkulow
Sewerodwinsk
Z-Zero SYSTEMS inc.
03/III-00
- No, I think it's ...
- Yes, it's insanity, marasmus!
Z-Zero SYSTEMS inc.
with someone.
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