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ZX Review #7-8-9-10
08 ноября 1997 |
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Studies - The procedure for display pictures. Fade-OUT effect (picture goes beyond the edge of the screen). Visual effect "Fountain." Fade-OUT effect, mimicking the TV off. Procedure "Ignition" pictures. The program continuously drawing a picture.
(C) Komandin IG, Kaluga
And again I want to offer
some of his (and not only
its) programmok to the "Etudes."
1. For starters, according to tradition,
suggest a fairly simple
protsedurku display pictures.
The program as it pulls
picture, located at BUFF, from the center of the screen to
edges. Procedure corrupts
image in memory, so again it will work as a challenge
quenching procedure, Waist
picture of the screen.
140.
ORG 40000
BUFF EQU 50000
ENT
LD DE, BUFF-16384
LD C, 128
LOOP2 LD HL, # 400F
LD B, 192
LOOP1 PUSH BC
PUSH HL
ADD HL, DE
LD B, 16
L1 RL (HL)
DEC HL
DJNZ L1
POP HL
PUSH HL
LD B, 16
L2 RL (HL)
DEC HL
DJNZ L2
POP HL
INC HL
PUSH HL
ADD HL, DE
LD B, 16
L3 RR (HL)
INC HL
DJNZ L3
POP HL
LD B, 16
L4 RR (HL)
INC HL
DJNZ L4
LD BC, 15
ADC HL, BC
POP BC
DJNZ LOOP1
DEC C
JR NZ, LOOP2
LD HL, BUFF +6144
LD DE, 22528
LD BC, 768
LDIR
RET
2
2. The following procedure - quite interesting FADE-OUT
effect. The picture seemed to be gradually broken in the middle
screen and goes for his province. 140.
; (C) ZX-MANIACS
;
ORG 40000
ENT
LD HL, # 400F
LD B, 1
LOOP1 PUSH HL
PUSH BC
CALL SLIDE
POP BC
POP HL
INC B
LD A, B
CP 192
JR NZ, LOOP1
LD HL, # 480F
LD B, 128
LOOP2 PUSH BC
LD B, 128
PUSH HL
CALL SLIDE
POP HL
POP BC
DJNZ LOOP2
RET
SLIDE PUSH BC
PUSH HL
PUSH HL
LD B, 16
XOR A
L1 RL (HL)
DEC HL
DJNZ L1
POP HL
INC HL
XOR A
LD B, 16
L2 RR (HL)
INC HL
DJNZ L2
POP HL
CALL DOWN
POP BC
DJNZ SLIDE
RET
DOWN INC H
LD A, H
AND 7
RET NZ
LD A, L
ADD A, 32
LD L, A
RET C
LD A, H
SUB 8
LD H, A
RET
2
3. And now the time has come
very interesting. The following program is the main reason for
writing this article. It's quite beautiful,
In my opinion, the graphic pixel effect, which I call
FOUNTAIN. Its action is as follows: in the middle
the lower edge of the screen appears
250 points, which are emitted in
different directions for a variety of
parabolic trajectories. As
only any of the points of touching the lower edge of the screen,
She reappears in the center with
new "zaprogrammiruemoy" trajectory. This creates a
the effect of continuously running
fountain. Most clearly and beautifully
procedure looks in the following settings:
BORDER 0: PAPER 0: INK 7:
BRIGHT 1: POKE 23624,71
The idea of the program arose when
view ENLIGHT-ovsky demonstrashki ZY-ZY, what a great
Thanks to the authors. I would also like to thank A. Astafieva
for an article about how to obtain random
numbers - one of its PRNG generators I have used in their
program.
140.
; FONTAIN
; (C) ZX-MANIACS
; BY KOMANDIN ILYA
; SPECIAL FOR INFORCOM
;
ORG 40000
ENT
LD HL, COORDS
LD B, 250
M1 CALL RND
AND 7
ADD A, 120
LD (HL), A
INC HL
LD (HL), 0
INC HL
CALL RND
AND 15
INC A
LD (HL), A
INC HL
CALL RND
AND 7
SUB 3
LD (HL), A
INC HL
DJNZ M1
LOOP LD HL, COORDS
LD B, 250
M2 PUSH BC
PUSH HL
LD C, (HL)
INC HL
LD B, (HL)
LD A, 191
SUB B
PUSH HL
CALL 8880
LD B, A
LD A, 7
SUB B
ADD A, A
ADD A, A
ADD A, A
ADD A, 134
LD (RPX), A
DEFB # CB
RPX NOP
POP HL
INC HL
LD B, (HL)
DEC HL
LD A, (HL)
ADD A, 8
LD (HL), A
INC HL
INC HL
LD B, (HL)
DEC HL
DEC HL
DEC HL
LD A, (HL)
ADD A, B
LD (HL), A
LD C, (HL)
INC HL
LD B, (HL)
LD A, 191
SUB B
PUSH HL
CALL 8880
LD B, A
LD A, 7
SUB B
ADD A, A
ADD A, A
ADD A, A
ADD A, 198
LD (SPX), A
DEFB # CB
SPX NOP
POP HL
LD A, (HL)
OR A
JR NZ, PASS
LD (HL), 0
DEC HL
CALL RND
AND 7
ADD A, 120
LD (HL), A
INC HL
INC HL
CALL RND
AND 15
INC A
LD (HL), A
INC HL
CALL RND
AND 7
SUB 3
LD (HL), A
PASS POP HL
POP BC
INC HL
INC HL
INC HL
INC HL
DJNZ M2
LD HL, 22496
LD DE, 22497
LD BC, 31
LD (HL), 0
LDIR
LD A, # 7F
IN A, (# FE)
RRA
JP C, LOOP
RET
RND LD DE, 0
LD A, D
ADD A, # 77
LD D, A
RLC E
ADD A, E
LD E, A
LD (RND +1), DE
RET
COORDS DEFS 100
2
4. Well that's all of my programs. Further, I propose
several procedures of my friend and the second member of the
group ZX-MANIACS Cherebaeva Andrew.
The first program - FADE-OUT
effect that simulates the shutdown
TV.
140.
; (C) CHEREBAEV ANDREY
;
ORG 40000
ENT
LD HL, # 5820
LD DE, # 5ADF
LD B, 11
LOOP1 PUSH BC
LD B, 32
LOOP PUSH BC
LD (HL), 127
LD BC, # 0020
SBC HL, BC
LD (HL), 0
ADC HL, BC
INC HL
EX DE, HL
LD (HL), 127
ADC HL, BC
LD (HL), 0
SBC HL, BC
DEC HL
EX DE, HL
POP BC
DJNZ LOOP
POP BC
HALT
DJNZ LOOP1
LD HL, # 595F
LD B, 32
LOOP2 INC L
LD (HL), 0
DJNZ LOOP2
LD B, 16
LD HL, # 5980
LD DE, # 599F
XOR A
LOOP3 LD (HL), A
INC L
LD (DE), A
DEC E
HALT
DJNZ LOOP3
LD B, 8
LD A, 63
LD HL, # 598F
LOOP4 LD (HL), A
SUB 9
HALT
HALT
HALT
HALT
HALT
DJNZ LOOP4
RET
2
The second procedure "burns"
picture, acting absolutely
opposed to the previous one. These
two applets is convenient to use together.
140.
; (C) CHEREBAEV ANDREY
;
ORG 40000
BUFF EQU 50000
ENT
LD HL, 22528
LD (HL), 0
PUSH HL
POP DE
INC DE
LD BC, 767
LDIR
LD HL, BUFF
LD DE, 16384
LD BC, 6144
LDIR
LD B, 8
XOR A
LD HL, # 598F
LOOP4 LD (HL), A
ADD A, 9
HALT
HALT
HALT
HALT
HALT
DJNZ LOOP4
LD B, 16
LD HL, # 598F
LD DE, # 5990
LD A, 127
LOOP3 LD (HL), A
DEC L
LD (DE), A
INC E
HALT
DJNZ LOOP3
LD HL, # 595F
LD DE, # 59A0
LD B, 11
LOOP1 PUSH BC
LD B, 32
LOOP PUSH BC
LD (HL), 127
LD BC, # 0020
ADC HL, BC
CALL PUT
SBC HL, BC
DEC HL
EX DE, HL
LD (HL), 127
LD BC, # 0020
SBC HL, BC
CALL PUT
ADC HL, BC
INC HL
EX DE, HL
POP BC
DJNZ LOOP
POP BC
HALT
DJNZ LOOP1
LD HL, BUFF +6144
LD DE, # 5800
LD BC, 768
LDIR
RET
PUT PUSH HL
PUSH DE
LD DE, BUFF-16384
ADC HL, DE
LD A, (HL)
POP DE
POP HL
LD (HL), A
RET
2
And finally, the third procedure - a "remake" is widely
known program continuously drawing a picture from the top down
the lines (see, for example, ZX REVIEW 2.1 for 1996).. The new
version of the picture is displayed along with attributes,
making the effect much wins. 144.
1910; (C) CHEREBAEV ANDREY
1920; 'KOMANDIN ILYA
30;
40 ORG 40000
50 ENT
60 BUFF EQU 50000
70 LD HL, 22528
80 LD (ATTR), HL
90 XOR A
100 LD B, 24
110 LOOP PUSH BC
120 LD B, 8
130 LOOP1 PUSH BC
140 PUSH AF
150 LD C, 0
160 CALL 8880
170 EX DE, HL
180 LD HL, BUFF-16384
190 ADC HL, DE
200 LD BC, 32
210 LDIR
220 POP AF
230 INC A
240 POP BC
250 HALT
260 DJNZ LOOP1
270 LD DE, (ATTR)
280 LD HL, BUFF-16384
290 ADC HL, DE
300 LD BC, 32
310 LDIR
320 LD (ATTR), DE
330 POP BC
340 DJNZ LOOP
350 RET
360 ATTR DEFW 0
2
In the above embodiment
programs first portions of 8
lines derived monochrome
image and then superimposed on it the attributes. If
You want the opposite effect
(Eg, if the background in your picture is unchanged, and all
the attributes - INK), then simply move the lines 270-320 to a
new location between lines 110 and 120.
*
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