Lua Programming Help Thread

Okay, heres my code:

Code:

---

-- Alien Crosshair Game Screen
-- Completally Coded by Mailas Gonrai
-- Most errors fixed by pjspeedy and yaustar
-- Colors
black = Color.new(0,0,0)
blue = Color.new(191, 255, 195)
yellow = Color.new(255, 255, 0, 200)
green=Color.new(0,255,0, 195)
white = Color.new(255,255,255)
red = Color.new(255,69,0, 195)

-- ETC Variables
displayTime = math.random(2,5)
counter = 0
speed = 1
offscreen = false
pad = Controls.read()
-- Functions
function RandomPoint()
end
math.randomseed(os.time())

-- Images
back = Image.load("./Images/back_game.png")
crosshair = Image.load("./Images/crosshair.png")
border = Image.load("./Images/game_border.png")
alienimage = Image.load("./Images/alien.png")

-- Music
Music.playFile("./Music/grmus.it")

-- Objects
Player = {}
Player.x = 208
Player.y = 112

alien = {}
alien.x = math.random(1,3)
alien.y = math.random (1,3)
alien = {x = 0, y = 200}
x_point = 23
y_point = 83

-- Health Equivelent Options
Player.health = 100
healthbar = {}
healthbar.y = 10


function movePlayer()
        if pad:left() then
                Player.x = Player.x - 4
        end

        if pad:right() then
                Player.x = Player.x + 4
        end
       
        if pad:down() then
                Player.y = Player.y + 4
        end

        if pad:up() then
                Player.y = Player.y - 4
        end
end

function perimeterSize()
        if Player.x > 480 - 64 then
                Player.x = 480 - 64
        end
       
        if Player.x < 0 then
                Player.x = 0
        end

        if Player.y > 272 - 64 then
                Player.y = 272 - 64
        end
       
        if Player.y < 0 then
                Player.y = 0
        end
end



-- THE LOOP!----------------------------------------------------------

while true do

        screen:clear()
        x_point = math.random(1,480)
y_point = math.random(1,272)
AlienMove()

        if alien.x < x_point then
alien.x = alien.x + 2
end
if alien.x > x_point then
alien.x = alien.x - 2
end
if alien.y < y_point then
alien.y = alien.y + 2
end
if alien.y < y_point then
alien.y = alien.y - 2
end
if alien.x == x_point and alien.y == y_point then
RandomPoint()
end
                                       
               
                counter = counter + 1
       
                if counter >= displayTime then
                        alien.x = math.random(1,3)
                        alien.y = math.random (1,3)
                                end
       
                if alien.x == 1 then
                        alien.x = 224
                        alien.y = 182
                end
       
                if alien.x == 2 then
                        alien.x = 60
                        alien.y = 132
                end
       
                if alien.x == 3 then
                        alien.x = 404
                        alien.y = 154
                end
       
                       
                displayTime = math.random(500,2000)
                counter = 0
        end
       
        screen:blit(0,0,back)
                    screen:blit(alien.x,alien.y,alienimage)       
                    screen:blit(Player.x,Player.y,crosshair)
        screen:blit(0,0,border)
       
        screen:fillRect(320,240,Player.health,healthbar.y,green)
        screen:print(320,230,Player.health,blue)
       
        movePlayer()
        perimeterSize()
        alienscreenSize()
       
        if pad:l() then
                dofile("menu.lua")
        end

        screen.waitVblankStart()
        screen.flip()
end

---

And my error:

Zitat:

---

error: ./game.lua:159: /<eof>/ expected near /end/

---

Zitat:

---

displayTime = math.random(500,2000)
counter = 0
end

---

The 'end' there is messing your script up. Remove it.

Technically, its the end at the very end. Putting that mis-placed end where he does have it, closes the main loop, and until something breaks it, everything beyond it is useless... Removing hte ending end would also solve it ;) Just not how you would want it.

Zitat:

---

Zitat von SG57

Technically, its the end at the very end. Putting that mis-placed end where he does have it, closes the main loop, and until something breaks it, everything beyond it is useless... Removing hte ending end would also solve it ;) Just not how you would want it.

---

Yes, I assumed he wanted a solution that would help him.

Could anyone tell me how to make it so...in the end of your code when if it sais like..press x how do i make it read another text document...


so how do i make it read another text thing after i press abuton...code please =-)

dofile("path.lua")

@ Gonrai
If you wanted you could improve your code's efficiency by combining the functions movePlayer() and perimeterSize() like this:

Code:

---

function movePlayer()
        if pad:left() and Player.x > 0 then
                Player.x = Player.x - 4
        end

        if pad:right() and Player.x < 480 - 64 then
                Player.x = Player.x + 4
        end
       
        if pad:down() and Player.y < 272 - 64 then
                Player.y = Player.y + 4
        end

        if pad:up() and Player.y > 0 then
                Player.y = Player.y - 4
        end
end

---

It's a small improvement, sure, but if your project becomes large, it's the little things like this that you have to watch for and improve.


@ altunozara

Code:

---

file=io.open("yourfile.txt","r")
documenttext=file:read("*a")
file:close()

---

The variable "documenttext" will be one long string containing all of the characters in your text file, including possibly the character representations of escape sequences. Be aware that unless your file is essentially one line (e.g. you didn't press Enter while you were making the text file), you may have some funky characters like that.

is it possible to clear some part of the screen and not everything

I think it is, but i forgot how.

Heres what I did:
I looked at what emulator guy said and was kinda confused because
1. the math.random on displayTime is 2,5, not 200,5000
2. There is no end under the counter variable.

THen, I looked at SG57's post and I removed the end so it looks like this:

Code:

---

if pad:l() then
                dofile("menu.lua")
        end

        screen.waitVblankStart()
        screen.flip()

---

At the end of my script. But heres what happened:
When I loaded my game on my menu script, it just froze.