need help!!! side scroller - GameCreators Forum

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Side scroller background

9

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Joined: 14th Nov 2015

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Posted: 14th Nov 2015 00:44

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need help!!! im trying to make my background side scroll. but some reason its not working. it was working before though i might have changed something but i don't remember can anyone tell me if there is something wrong?

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Side scroller background

9

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Joined: 14th Nov 2015

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Posted: 14th Nov 2015 00:55

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I'm trying to make a side scrolling background, and I'm not sure what im doing wrong can anyone help plz?

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LBFN

17

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Joined: 7th Apr 2007

Location: USA

Posted: 14th Nov 2015 13:36

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Could you post the pertinent code in a snippet? The DBPro file you attached will not show us anything. You could attach the .dba file, but it would be easier / simpler to just post your code related to the background scrolling.

So many games to code.....so little time.

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Side scroller background

9

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Joined: 14th Nov 2015

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Posted: 16th Nov 2015 19:54

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+ Code Snippet

Rem Level screen

set display mode 1024, 512, 0
sync rate 0
sync on
hide mouse

load bitmap "Futurecity.png",1
create bitmap 2,1024,512

set current bitmap 1
for i=1 to 1024
   get image i,i-1,0,i,512
next i

set text opaque
ink rgb(255,255,255),0

dim x(1024)
for a=1 to 1024
   x(a)=a
next a

gosub _vScroller

do

_vScroller: REM Vertical Scroller

set current bitmap 2

   for i=1 to 1024
      paste image x(i),i,0
      oldy=x(i)
      inc oldy
      if oldy>1024 then oldy=1
      x(i)=oldy
   next i

   text 0,0,str$(screen fps())

   set current bitmap 0
   copy bitmap 2,0

Return

sync

loop

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Side scroller background

9

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Joined: 14th Nov 2015

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Posted: 16th Nov 2015 20:15

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This is it.

+ Code Snippet

Rem Level screen

set display mode 1024, 512, 0
sync rate 0
sync on
hide mouse

load bitmap "Futurecity.png",1
create bitmap 2,1024,512

set current bitmap 1
for i=1 to 1024
   get image i,i-1,0,i,512
next i

set text opaque
ink rgb(255,255,255),0

dim x(1024)
for a=1 to 1024
   x(a)=a
next a

gosub _vScroller
_vScroller: REM Vertical Scroller
do



set current bitmap 2

   for i=1 to 1024
      paste image x(i),i,0
      oldy=x(i)
      inc oldy
      if oldy>1024 then oldy=1
      x(i)=oldy
   next i

   text 0,0,str$(screen fps())

   set current bitmap 0
   copy bitmap 2,0

Return

sync

loop

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LBFN

17

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Joined: 7th Apr 2007

Location: USA

Posted: 17th Nov 2015 16:46

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The problem is that you are calling the _vScroller subroutine and returning from it before the DO - LOOP fully executes. Try this:

+ Code Snippet

Rem Level screen

set display mode 1024, 512, 0
sync rate 0
sync on
hide mouse

load bitmap "Futurecity.png",1
create bitmap 2,1024,512

set current bitmap 1
for i=1 to 1024
   get image i,i-1,0,i,512
next i

set text opaque
ink rgb(255,255,255),0

dim x(1024)
for a=1 to 1024
   x(a)=a
next a
do
    set current bitmap 2
    for i=1 to 1024
      paste image x(i),i,0
      oldy=x(i)
      inc oldy
      if oldy>1024 then oldy=1
      x(i)=oldy
    next i
    text 0,0,str$(screen fps())
    copy bitmap 2,0
    set current bitmap 0
    sync
loop

I must say that I have never seen scrolling done like that before, but it does indeed work. It actually runs at 316 FPS on my rig.

So many games to code.....so little time.

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Side scroller background

9

Years of Service

User Offline

Joined: 14th Nov 2015

Location:

Posted: 20th Nov 2015 22:31

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Thanks a lot man and i'll take that as a compliment

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Phaelax

DBPro Master

21

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Joined: 16th Apr 2003

Location: Metropia

Posted: 23rd Jan 2016 06:13

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I get around 420 fps.

Just for fun, using this method you could add a sine wave to it!

+ Code Snippet

Rem Level screen
 
set display mode 1024, 512, 0
sync rate 0
sync on
hide mouse
 
load bitmap "D:\Futurecity.png",1
create bitmap 2,1024,512
 
set current bitmap 1
for i=1 to 1024
   get image i,i-1,0,i,512
next i
 
set text opaque
ink rgb(255,255,255),0
 
dim x(1024)
for a=1 to 1024
   x(a)=a
next a



do
    set current bitmap 2
    for i = 1 to 1024
        y = sin(i)*10
        paste image x(i), i, y
        oldy = x(i)
        inc oldy
        if oldy>1024 then oldy=1
        x(i)=oldy
    next i
    text 0,0,str$(screen fps())
    copy bitmap 2,0
    set current bitmap 0
sync
loop

"I like offending people, because I think people who get offended should be offended." - Linus Torvalds

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