Blitting

[bronxbomber92]

Hey, I'm brand new to DSLua today, and rather experianced with PSPLua. I need help blitting images to the scrren, as I see its not as easy as

Code:

menu = Image.Load("menu.png")

screen:blit(0, 0 menu)

Could someone please help me, I'm porting a PSP lua game to the DS, so I can post that code if anyone needs to take a look at it, Thanks.

[daltonlaffs]

At the current time, .png images are not supported in DSLua. You must use a 256 color bitmap and convert it using gfx2gba.

[bronxbomber92]

Yes, that is the one thing I do know, but I dont know how to load the image then blit it. I dont need to blit on the bottom screen yet. so Let me show you the equivalent of wat I need.

Code:

Music.playFile("start/sonicdrm.s3m", true)
Menu = Image.load("start/MainMenu.png")
Quit = Image.load("start/Quit.png")
QuitOver= Image.load("start/QuitOver.png")
Start = Image.load("start/Start.png")
StartOver = Image.load("start/StartOver.png")
menunum = 1


while true do


pad = Controls.read()

screen:blit(0, 0, Menu)
screen:print(0,0,"netlib version - press R for online play")

if pad:down() then
menunum = menunum+1
screen.waitVblankStart(10)
end

if pad:up() then
menunum = menunum-1
screen.waitVblankStart(10)
end

if menunum==0 then
menunum=menunum+2
end
if menunum==3 then
menunum=menunum-2
end

if menunum == 1 then
screen:blit(146, 205, StartOver)
screen:blit(146, 229, Quit)
end

if menunum == 2 then
screen:blit(146, 229, QuitOver)
screen:blit(146, 205, Start)
end

if menunum == 1 and pad:cross() then
mode = "game"
dofile("Charselect.lua")
end

if menunum == 2 and pad:cross() then
break
end

if pad:r() then
mode = "online"
dofile("Charselect.lua")
end

screen.flip()
end

I know the music commands, print command( which is print() )and I know the Pads commands. But I wish to load and blit these images. Any help?

[Zhen]

Hi,

The best option that you can try are sprites. Load a sprite Frame Strip with all button states, and change the actual sprite instead of blitting.

Code:

SCREEN_BOTTOM = 0
SPRITE_PALETTE = 0

Sprite.LoadPalette( SCREEN_BOTTOM, SPRITE_PALETTE, "sprite.pal" )

StartButtons = FrameStrip.Create( SCREEN_BOTTOM, 64, 32, "256" )

StartButtons:LoadBin( "startbuttons.raw", 2 )

Start = Sprite.Create( StartButtons, 0, SPRITE_PALETTE, 146, 205 )

while 1 do
    -- blabla
    if menunum == 1 then
        Start:SetFrame( StartButtons, 1 )
        -- Quit:SetFrame( QuitButtons, 0 )
    end

    if menunum == 2 then
        Start:SetFrame( StartButtons, 0 )
        -- Quit:SetFrame( QuitButtons, 1 )
    end
end

Start:Free()
StartButtons:FreeAll()

You can look for examples in DSLua zip about  *.pal and *.raw creation.

Zhen

[bronxbomber92]

But these arent all from one "sprite sheet". these are seperate pics. Is their not a way to simply blit  picture?

[Zhen]

But these arent all from one "sprite sheet". these are seperate pics. Is their not a way to simply blit  picture?

Well that's true, but I think also that it's the best way to made the things that you want.

Another way is, using putpixel, make the blit function yourself. But you need to load the image.

Zhen