Cool i'll try it out.
Doubleposted Message Below:
I just tried it. it's pretty cool. Keep up the good work. i'm looking forward to seeing what you come up with in the future

new stuff added -

d-pad moves the ship

holding down cross slowly increases scroll speed, releasing it will slowly decrease scroll speed

tapping circle will increase ship movement speed
tapping triangle will decrease ship speed

*edit*

small change, just updated the ship graphic to one with transparency

and now I've fixed a couple of error in the code that would let the ship move out of the viewing area. I've also added background music from gradius 3 (not made by me, but found at The Mod Archive - Modarchive V2.0)

Except for the middle layer graphic (which I made myself), mostl other graphics that I will be using are from various free image sites that don't require you to give credit.

This zip just has the music file and an updated program file

ack, something's wrong

I removed the scroll from the main program and set it up as a function called scrollforward. I then set up a variable called scrollmode and set it to 1.

In the main body of the prog, if I use this:

if scrollmode = 1 then scrollforward() end

i get the debug message:

error: paralax.lua:76: 'then' expected near '='

however, if i change it to:

if scrollmode then scrollforward() end

it works??

I'm planning to more scroll functions - forward, reverse, up, and down. So I need to be able to tell what number (1-4) that scrollmode is set to. Any ideas?

I can't remember much Lua but would it be

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yeah, you're right that was the problem, thanks!
Doubleposted Message Below:
Is there a size limit for images that can be loaded with Image.load?
Doubleposted Message Below:
nvm found it - 512x512

.

New version, I'm gonna need help debugging it though. I've changed the code so that all layers use a 512x512 tile, with the middle and front layers using transparencies.I've commented out the drawing of the middle and front layers in this version.

I've got it set up so that the images for the layers are displayed three times:

x - 512, x, x + 512 for horizontal scroll
y - 512, y, y + 512 for vertical scroll

for each mode, the opposite coord is set to zero

However, it's not working out quite like it should. In horizontal mode, I get a black bar that appears on the left side of the screen when the scroll cycle reaches a certain point. The same thing happens at the top of the screen in vertical mode, except that the black bar takes up almost have the screen.


control change for this version:

analog stick: move ship
d-pad: change scroll mode


*note - the board wouldn't let me upload the file as a zip, so I changed the extension to .mp3 to get past the size restriction. Just change it back to .zip to extract the files.

Gonna try now

EDIT: Use WinRAR to make it a .rar,

Looking at the source, it's great for someone who has only just learnt Lua!

Attached Files

scroll engine.rar (989.8 KB, 6 views)

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well, years ago I did do a lot of messing around with quickbasic. Never really got past doing simple graphics with it though (kaleidescope etc..), didn't have the patience back then to learn how to do things like sprites and stuff. Although I was a little confused by the differences at first, lua is turning out to be much easier to program (graphics wise at least, I won't be getting into collisions and stuff until I get the main display engine worked out)