Lua Programming Help Thread

this is probably n00bish but how do you load small images in certain spots?

Ive tried this:
Random Image = Image.load(100, 200, "Random Image.png")

but it wont load anything ( no that is not my real script just an example. I cant get anything to load it just says press start to restart. Every now and then text that is supposed to be displayed ends up showing in the menu. PLZ Help!

Zitat:

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Zitat von cools

this is probably n00bish but how do you load small images in certain spots?

Ive tried this:
Random Image = Image.load(100, 200, "Random Image.png")

but it wont load anything ( no that is not my real script just an example. I cant get anything to load it just says press start to restart. Every now and then text that is supposed to be displayed ends up showing in the menu. PLZ Help!

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You have to blit the image then update the screen by using "screen:flip()"

Code:

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image = Image.load("image.png")
screen:blit(=100, 200, image)

screen:flip()

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Zitat:

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Zitat von EstaCompton

No one's helping me :(

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No one's helped me either ;)
Noone knows how to do what your asking.

Zitat:

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Zitat von Virtue

I am trying to make a coin flipping program, you press X and it will display an message, heads, or with tails. Here is as far as the display part goes.

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It should look like this:

Code:

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bg = Image.load("bg.png")

red = Color.new(255, 0, 0)
blue = Color.new(0, 0, 255)
yellow = Color.new(255, 255, 0)


while true do
        pad = Controls.read()

        screen:print(120, 15, "Welcome to my coin toss game!", blue)
        screen:print(60, 190, "Press X to Flip Coin!", yellow)
        screen.flip()

        if pad:cross() then
                side = math.random(2)
                if side==1
                        screen:clear()
                        screen:blit(0, 0, bg, false)
                        screen:print(120, 15, "Welcome to my coin toss game!", blue)
                        screen:print(160, 30, "Created By Jesse", red)
                        screen:print(60, 190, "Press X to Flip Coin!", yellow)
                        screen:print(60, 160, "Coin Flipped! Heads!", yellow)
                        screen.flip()
                elseif side==2
                        screen:clear()
                        screen:blit(0, 0, bg, false)
                        screen:print(120, 15, "Welcome to my coin toss game!", blue)
                        screen:print(160, 30, "Created By Jesse", red)
                        screen:print(60, 190, "Press X to Flip Coin!", yellow)
                        screen:print(60,160, "Coin Flipped! Tails!", yellow)
                        screen.flip()
                end
        end

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Code:

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pad = Controls.read()

if pad:up() then
        menupos = menupos - 1
        if menupos == 0 then
                menupos = 3
        end
end

if pad:down() then
        menupos = menupos + 1
        if menupos == 4 then
                menupos = 1
        end
end

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1. If I don't just ever so lightly tap the d-pad, the cursor will go down at least 4-5 spaces in a single normal press of the button. How can I make it so the cursor will only move one space for every button press.

Edit: I tried Vblanks, but they didn't work at all.

Code:

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screen:print(0,40,"###",rgb)
screen:print(0,50,"###",rgb)
screen:print(0,60,"###",rgb)

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2. How do I use drawrect? >_>

3. It would be really cool if someone could show me some tips to optimize my code.

Thanks in advance.

True, true. Maybe I'll do something easier....

Thanks !

does anyone have a list of functions for lua??

Oh YES!!!
I really need help (I never knew there was a thread like this)
How can i make a main menu and make a topdown view person walk.
I really wanna make my DBZ Charecter walk on the screen but he stay's still :dry:

Anyhelp would be highley appreciated.

Zitat:

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Zitat von Lancer

Code:

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pad = Controls.read()

if pad:up() then
        menupos = menupos - 1
        if menupos == 0 then
                menupos = 3
        end
end

if pad:down() then
        menupos = menupos + 1
        if menupos == 4 then
                menupos = 1
        end
end

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1. If I don't just ever so lightly tap the d-pad, the cursor will go down at least 4-5 spaces in a single normal press of the button. How can I make it so the cursor will only move one space for every button press.

Edit: I tried Vblanks, but they didn't work at all.

Code:

---

screen:print(0,40,"###",rgb)
screen:print(0,50,"###",rgb)
screen:print(0,60,"###",rgb)

---

2. How do I use drawrect? >_>

3. It would be really cool if someone could show me some tips to optimize my code.

Thanks in advance.

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There is no drawRect function in lua so you have to make your own.

Code:

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function drawRect(where, x, y, width, height, color)
        where:drawLine(x, y, x+width, y, color)
        where:drawLine(x+width, y, x+width, y+height, color)
        where:drawLine(x+width, y+height, x, y+height, color)
        where:drawLine(x, y+height, x, y, color)
end

-- Use it like this

drawRect(screen, 20, 20, 40, 20, blue)

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Also vblank should work

Just put this at the start of your while loop:

Code:

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screen.waitVblankStart(5)

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Zitat:

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Zitat von TeamOverload

does anyone have a list of functions for lua??

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http://www.lua.org/pil/index.html#P3
http://luaplayer.org/functions.txt