Lua Programming Help Thread

What errors do you get?

if you mean me Anti-QJ, then the error is at the 'target:pixel' line. (theres only one) it says arguments incorrect. what i'm trying to do is get the circle to appear once and put that circle as an image in the buffer so the psp can speed up.
if you meant GG, he hasnt posted what was his error.

EminentJohnFrost: Just put in the actual numbers for x and y, since it only draws the circle one time.

but then it wouldnt move
and its not becuase of lag

No I mean when you're drawing the circle to the player, not when you're blitting the player.

Zitat:

---

Zitat von EminentJonFrost

i was right about this code being impractical it seems. this code does work, but it GOBBLES up ram. the circle doesnt even inch forward, it more like millimeters forward, if it feels like it. but then i took out 7 of the 8 times i use the function and now it inches forward, still taking forever. i'm sure its a memory issue because everything works, just real slowly, including the home button.

Code:

---

x = 100
y = 100

function drawcircle(target, x, y, radius, ccolor)
        degree = 0
        while degree < (6.4) do
                target:pixel((math.floor(radius * math.cos(degree)))+ x, (math.floor(radius * math.sin(degree))) + y, ccolor)
                degree = degree + 0.005
        end
end

while true do
        screen:clear(black)
        pad = Controls.read()

        analog = { x = pad:analogX(), y = pad:analogY() }

        if pad:start() then
                break
        end

        if analog.x > 20 then
                x = x + 1
        end

        if analog.x < -20 then
                x = x - 1
        end

        if analog.y > 20 then
                y = y - 1
        end

        if analog.y < -20 then
                y = y + 1
        end

        drawcircle(screen, x, y, 8, gray) -- there used to be 8 of these, but with another number in place of '8'.


        screen.flip()
        screen.waitVblankStart()
end

---

---

your drawing 8 circles every frame, and trig functions are ram hoggers. i would recommed having separate images and just load them.

im trying to generate a random numbwe, so i put
var = math.random(0,9)
so it would generate a value btw 0 and 9, im running the script on Windows Lua player, but it always generate me the number 0. Why?

Probably because you're using wlp.

O well my game is fine Im putting it on hold anyways. But I have another question are there any tutorials on how to use the psp analog in lua?

Look at the lua snippets thread and find the section of my snippets and theres an analog one

Zitat:

---

Zitat von agashka

im trying to generate a random numbwe, so i put
var = math.random(0,9)
so it would generate a value btw 0 and 9, im running the script on Windows Lua player, but it always generate me the number 0. Why?

---

did you put:

Code:

---

math.randomseed(os.time())

---

at the beginning of your code?

thanks emericaska8r, now it works!

Okay when I try to run this it says my blit is a bad arguement or something.. hold on...
ok here it is exactly

error: script.lua:63: bad argument #2 to 'blit' <image
expected, got table>

just started working on this today so I know i havent blited the aliens yet or done collision or gun function.

Spoiler for Code:

Code:

---

--Aliens lua
--color variables
red = Color.new(255,0,0)
green = Color.new(0,255,0)
black = Color.new(0,0,0)
--for soldier bullets
bullet = Image.createEmpty(4,4)
bullet:clear(green)
--prevents random numbers bla bla
math.randomseed(os.time())
--table for loading alien pics
alienpic = {}
alienpic[1] = {Image.load("pics/aliens/alienup.png")}
alienpic[2] = {Image.load("pics/aliens/aliendown.png")}
alienpic[3] = {Image.load("pics/aliens/alienleft.png")}
alienpic[4] = {Image.load("pics/aliens/alienright.png")}
--table for soldier pics
soldierpic = {}
soldierpic[1] = {Image.load("pics/soldier/soldierup.png")}
soldierpic[2] = {Image.load("pics/soldier/soldierdown.png")}
soldierpic[3] = {Image.load("pics/soldier/soldierleft.png")}
soldierpic[4] = {Image.load("pics/soldier/soldierright.png")}
--table for soldier's x and y coordinates
soldier = {}
soldier[1] = {x = 230 , y = 130}
--alien's x and y coordinates
alien = {}
alien[1] = {x = 420, y = 250}
alien[2] = {x = 320, y = 720}
alien[3] = {x = 200, y = 150}
alien[4] = {x = 500, y = 210}
alien[5] = {x = 320, y = 123}
alien[6] = {x = 127, y = 480}
alien[7] = {x = 439, y = 200}
alien[8] = {x = 210, y = 657}
alien[9] = {x = 312, y = 780}
alien[10] = {x = 123, y = 67}
--which way is the soldier facing?
direction = 1
--is he alive?
soldieralive = "true"
--soldier health
shealth = 100
--alien health
ahealth = 100
--aliens alive?
alienalive1 = "true"
alienalive2 = "true"
alienalive3 = "true"
alienalive4 = "true"
alienalive5 = "true"
alienalive6 = "true"
alienalive7 = "true"
alienalive8 = "true"
alienalive9 = "true"
alienalive10 = "true"
--start the main loop
while true do
pad = Controls.read()
screen:print(0,0,shealth,red)
--blit the soldier to the screen if hes still alive
if soldieralive == "true" then
screen:blit(soldier[1].x,soldier[1].y,soldierpic[direction])
end
--up
if pad:up() then
direction = 1
soldier[1].y = soldier[1].y - 3
end
--down
if pad:down() then
direction = 2
soldier[1].y = soldier[1].y + 3
end
--right
if pad:right() then
direction = 4
soldier[1].x = soldier[1].x + 3
end
--left
if pad:left() then
direction = 3
soldier[1].x = soldier[1].x - 3
end
--ai movement for all the aliens
--for the x coordinate
chasing = math.random(1,2)
--alien 1
if chasing == 1 and alien[1].x > soldier[1].x then
alien[1].x = alien[1].x - 1
end
if chasing == 1 and alien[1].x < soldier[1].x then
alien[1].x = alien[1].x + 1
end
--alien 2
if chasing == 1 and alien[2].x > soldier[1].x then
alien[2].x = alien[2].x - 1
end
if chasing == 1 and alien[2].x < soldier[1].x then
alien[2].x = alien[2].x + 1
end
--alien 3
if chasing == 1 and alien[3].x > soldier[1].x then
alien[3].x = alien[3].x - 1
end
if chasing == 1 and alien[3].x < soldier[1].x then
alien[3].x = alien[3].x + 1
end
--alien 4
if chasing == 1 and alien[4].x > soldier[1].x then
alien[4].x = alien[4].x - 1
end
if chasing == 1 and alien[4].x < soldier[1].x then
alien[4].x = alien[4].x + 1
end
--alien 5
if chasing == 1 and alien[5].x > soldier[1].x then
alien[5].x = alien[5].x - 1
end
if chasing == 1 and alien[5].x < soldier[1].x then
alien[5].x = alien[5].x + 1
end
--alien 6
if chasing == 1 and alien[6].x > soldier[1].x then
alien[6].x = alien[6].x - 1
end
if chasing == 1 and alien[6].x < soldier[1].x then
alien[6].x = alien[6].x + 1
end
--alien 7
if chasing == 1 and alien[7].x > soldier[1].x then
alien[7].x = alien[7].x - 1
end
if chasing == 1 and alien[7].x < soldier[1].x then
alien[7].x = alien[7].x + 1
end
--alien 8
if chasing == 1 and alien[8].x > soldier[1].x then
alien[8].x = alien[8].x - 1
end
if chasing == 1 and alien[8].x < soldier[1].x then
alien[8].x = alien[8].x + 1
end
--alien 9
if chasing == 1 and alien[9].x > soldier[1].x then
alien[9].x = alien[9].x - 1
end
if chasing == 1 and alien[9].x < soldier[1].x then
alien[9].x = alien[9].x + 1
end
--alien 10
if chasing == 1 and alien[10].x > soldier[1].x then
alien[10].x = alien[10].x - 1
end
if chasing == 1 and alien[10].x < soldier[1].x then
alien[10].x = alien[10].x + 1
end
----------------------------------------------------
--For the y coordinate
--alien 1
if chasing == 1 and alien[1].y > soldier[1].y then
alien[1].y = alien[1].y - 1
end
if chasing == 1 and alien[1].y < soldier[1].y then
alien[1].y = alien[1].y + 1
end
--alien 2
if chasing == 1 and alien[2].y > soldier[1].y then
alien[2].y = alien[2].y - 1
end
if chasing == 1 and alien[2].y < soldier[1].y then
alien[2].y = alien[2].y + 1
end
--alien 3
if chasing == 1 and alien[3].y > soldier[1].y then
alien[3].y = alien[3].y - 1
end
if chasing == 1 and alien[3].y < soldier[1].y then
alien[3].y = alien[3].y + 1
end
--alien 4
if chasing == 1 and alien[4].y > soldier[1].y then
alien[4].y = alien[4].y - 1
end
if chasing == 1 and alien[4].y < soldier[1].y then
alien[4].y = alien[4].y + 1
end
--alien 5
if chasing == 1 and alien[5].y > soldier[1].y then
alien[5].y = alien[5].y - 1
end
if chasing == 1 and alien[5].y < soldier[1].y then
alien[5].y = alien[5].y + 1
end
--alien 6
if chasing == 1 and alien[6].y > soldier[1].y then
alien[6].y = alien[6].y - 1
end
if chasing == 1 and alien[6].y < soldier[1].y then
alien[6].y = alien[6].y + 1
end
--alien 7
if chasing == 1 and alien[7].y > soldier[1].y then
alien[7].y = alien[7].y - 1
end
if chasing == 1 and alien[7].y < soldier[1].y then
alien[7].y = alien[7].y + 1
end
--alien 8
if chasing == 1 and alien[8].y > soldier[1].y then
alien[8].y = alien[8].y - 1
end
if chasing == 1 and alien[8].y < soldier[1].y then
alien[8].y = alien[8].y + 1
end
--alien 9
if chasing == 1 and alien[9].y > soldier[1].y then
alien[9].y = alien[9].y - 1
end
if chasing == 1 and alien[9].y < soldier[1].y then
alien[9].y = alien[9].y + 1
end
--alien 10
if chasing == 1 and alien[10].y > soldier[1].y then
alien[10].y = alien[10].y - 1
end
if chasing == 1 and alien[10].y < soldier[1].y then
alien[10].y = alien[10].y + 1
end
screen.waitVblankStart()
screen.flip()
end

---

Code:

---

soldierpic[1] = {Image.load("pics/soldier/soldierup.png")}

---

Is the same as saying:

Code:

---

soldierpic[1] = {}
soldierpic[1][1] = Image.load("pics/soldier/soldierup.png")

---

Hence the error.

Still dont understand.
?

Zitat:

---

Zitat von GuitarGod1134

Okay when I try to run this it says my blit is a bad arguement or something.. hold on...
ok here it is exactly

error: script.lua:63: bad argument #2 to 'blit' <image
expected, got table>

just started working on this today so I know i havent blited the aliens yet or done collision or gun function.

Spoiler for Code:

Code:

---

--Aliens lua
--color variables
red = Color.new(255,0,0)
green = Color.new(0,255,0)
black = Color.new(0,0,0)
--for soldier bullets
bullet = Image.createEmpty(4,4)
bullet:clear(green)
--prevents random numbers bla bla
math.randomseed(os.time())
--table for loading alien pics
alienpic = {}
alienpic[1] = {Image.load("pics/aliens/alienup.png")}
alienpic[2] = {Image.load("pics/aliens/aliendown.png")}
alienpic[3] = {Image.load("pics/aliens/alienleft.png")}
alienpic[4] = {Image.load("pics/aliens/alienright.png")}
--table for soldier pics
soldierpic = {}
soldierpic[1] = {Image.load("pics/soldier/soldierup.png")}
soldierpic[2] = {Image.load("pics/soldier/soldierdown.png")}
soldierpic[3] = {Image.load("pics/soldier/soldierleft.png")}
soldierpic[4] = {Image.load("pics/soldier/soldierright.png")}
--table for soldier's x and y coordinates
soldier = {}
soldier[1] = {x = 230 , y = 130}
--alien's x and y coordinates
alien = {}
alien[1] = {x = 420, y = 250}
alien[2] = {x = 320, y = 720}
alien[3] = {x = 200, y = 150}
alien[4] = {x = 500, y = 210}
alien[5] = {x = 320, y = 123}
alien[6] = {x = 127, y = 480}
alien[7] = {x = 439, y = 200}
alien[8] = {x = 210, y = 657}
alien[9] = {x = 312, y = 780}
alien[10] = {x = 123, y = 67}
--which way is the soldier facing?
direction = 1
--is he alive?
soldieralive = "true"
--soldier health
shealth = 100
--alien health
ahealth = 100
--aliens alive?
alienalive1 = "true"
alienalive2 = "true"
alienalive3 = "true"
alienalive4 = "true"
alienalive5 = "true"
alienalive6 = "true"
alienalive7 = "true"
alienalive8 = "true"
alienalive9 = "true"
alienalive10 = "true"
--start the main loop
while true do
pad = Controls.read()
screen:print(0,0,shealth,red)
--blit the soldier to the screen if hes still alive
if soldieralive == "true" then
screen:blit(soldier[1].x,soldier[1].y,soldierpic[direction])
end
--up
if pad:up() then
direction = 1
soldier[1].y = soldier[1].y - 3
end
--down
if pad:down() then
direction = 2
soldier[1].y = soldier[1].y + 3
end
--right
if pad:right() then
direction = 4
soldier[1].x = soldier[1].x + 3
end
--left
if pad:left() then
direction = 3
soldier[1].x = soldier[1].x - 3
end
--ai movement for all the aliens
--for the x coordinate
chasing = math.random(1,2)
--alien 1
if chasing == 1 and alien[1].x > soldier[1].x then
alien[1].x = alien[1].x - 1
end
if chasing == 1 and alien[1].x < soldier[1].x then
alien[1].x = alien[1].x + 1
end
--alien 2
if chasing == 1 and alien[2].x > soldier[1].x then
alien[2].x = alien[2].x - 1
end
if chasing == 1 and alien[2].x < soldier[1].x then
alien[2].x = alien[2].x + 1
end
--alien 3
if chasing == 1 and alien[3].x > soldier[1].x then
alien[3].x = alien[3].x - 1
end
if chasing == 1 and alien[3].x < soldier[1].x then
alien[3].x = alien[3].x + 1
end
--alien 4
if chasing == 1 and alien[4].x > soldier[1].x then
alien[4].x = alien[4].x - 1
end
if chasing == 1 and alien[4].x < soldier[1].x then
alien[4].x = alien[4].x + 1
end
--alien 5
if chasing == 1 and alien[5].x > soldier[1].x then
alien[5].x = alien[5].x - 1
end
if chasing == 1 and alien[5].x < soldier[1].x then
alien[5].x = alien[5].x + 1
end
--alien 6
if chasing == 1 and alien[6].x > soldier[1].x then
alien[6].x = alien[6].x - 1
end
if chasing == 1 and alien[6].x < soldier[1].x then
alien[6].x = alien[6].x + 1
end
--alien 7
if chasing == 1 and alien[7].x > soldier[1].x then
alien[7].x = alien[7].x - 1
end
if chasing == 1 and alien[7].x < soldier[1].x then
alien[7].x = alien[7].x + 1
end
--alien 8
if chasing == 1 and alien[8].x > soldier[1].x then
alien[8].x = alien[8].x - 1
end
if chasing == 1 and alien[8].x < soldier[1].x then
alien[8].x = alien[8].x + 1
end
--alien 9
if chasing == 1 and alien[9].x > soldier[1].x then
alien[9].x = alien[9].x - 1
end
if chasing == 1 and alien[9].x < soldier[1].x then
alien[9].x = alien[9].x + 1
end
--alien 10
if chasing == 1 and alien[10].x > soldier[1].x then
alien[10].x = alien[10].x - 1
end
if chasing == 1 and alien[10].x < soldier[1].x then
alien[10].x = alien[10].x + 1
end
----------------------------------------------------
--For the y coordinate
--alien 1
if chasing == 1 and alien[1].y > soldier[1].y then
alien[1].y = alien[1].y - 1
end
if chasing == 1 and alien[1].y < soldier[1].y then
alien[1].y = alien[1].y + 1
end
--alien 2
if chasing == 1 and alien[2].y > soldier[1].y then
alien[2].y = alien[2].y - 1
end
if chasing == 1 and alien[2].y < soldier[1].y then
alien[2].y = alien[2].y + 1
end
--alien 3
if chasing == 1 and alien[3].y > soldier[1].y then
alien[3].y = alien[3].y - 1
end
if chasing == 1 and alien[3].y < soldier[1].y then
alien[3].y = alien[3].y + 1
end
--alien 4
if chasing == 1 and alien[4].y > soldier[1].y then
alien[4].y = alien[4].y - 1
end
if chasing == 1 and alien[4].y < soldier[1].y then
alien[4].y = alien[4].y + 1
end
--alien 5
if chasing == 1 and alien[5].y > soldier[1].y then
alien[5].y = alien[5].y - 1
end
if chasing == 1 and alien[5].y < soldier[1].y then
alien[5].y = alien[5].y + 1
end
--alien 6
if chasing == 1 and alien[6].y > soldier[1].y then
alien[6].y = alien[6].y - 1
end
if chasing == 1 and alien[6].y < soldier[1].y then
alien[6].y = alien[6].y + 1
end
--alien 7
if chasing == 1 and alien[7].y > soldier[1].y then
alien[7].y = alien[7].y - 1
end
if chasing == 1 and alien[7].y < soldier[1].y then
alien[7].y = alien[7].y + 1
end
--alien 8
if chasing == 1 and alien[8].y > soldier[1].y then
alien[8].y = alien[8].y - 1
end
if chasing == 1 and alien[8].y < soldier[1].y then
alien[8].y = alien[8].y + 1
end
--alien 9
if chasing == 1 and alien[9].y > soldier[1].y then
alien[9].y = alien[9].y - 1
end
if chasing == 1 and alien[9].y < soldier[1].y then
alien[9].y = alien[9].y + 1
end
--alien 10
if chasing == 1 and alien[10].y > soldier[1].y then
alien[10].y = alien[10].y - 1
end
if chasing == 1 and alien[10].y < soldier[1].y then
alien[10].y = alien[10].y + 1
end
screen.waitVblankStart()
screen.flip()
end

---

---

when you do this:

Code:

---

soldierpic = {}
soldierpic[1] = {Image.load("pics/soldier/soldierup.png")}
soldierpic[2] = {Image.load("pics/soldier/soldierdown.png")}
soldierpic[3] = {Image.load("pics/soldier/soldierleft.png")}
soldierpic[4] = {Image.load("pics/soldier/soldierright.png")}

---

if you put {} around a table value, you must assign it a name.

so:

Code:

---

soldierpic = {}
soldierpic[1] = {pic = Image.load("pics/soldier/soldierup.png")}
soldierpic[2] = {pic = Image.load("pics/soldier/soldierdown.png")}
soldierpic[3] = {pic = Image.load("pics/soldier/soldierleft.png")}
soldierpic[4] = {pic = Image.load("pics/soldier/soldierright.png")}

---

then, when blitting, do this:

Code:

---

screen:blit(soldier[1].x,soldier[1].y,soldierpic[direction].pic)

---

OR: you could just do this:

remove the {}:like this:

Code:

---

soldierpic = {}
soldierpic[1] = Image.load("pics/soldier/soldierup.png")
soldierpic[2] = Image.load("pics/soldier/soldierdown.png")
soldierpic[3] = Image.load("pics/soldier/soldierleft.png")
soldierpic[4] = Image.load("pics/soldier/soldierright.png")

---

and then blit it like you were trying to:

Code:

---

screen:blit(soldier[1].x,soldier[1].y,soldierpic[direction])

---

Remove the brackets?
EDIT: ok I see. thanks.
EDIT2: ok works perfectly now thanks.

Zitat:

---

Zitat von Grimfate126

if you put {} around a table value, you must assign it a name.

---

No you don't:

Code:

---

array = {}
array [1] = {1, 2, 3, 4, Image.load("something.png") }

---

array [1][1] will be 1
array [1][2] will be 2
array [1][3] will be 3
array [1][4] will be 4
array [1][5] will be the loaded image.

Zitat:

---

Zitat von head_54us

No you don't:

Code:

---

array = {}
array [1] = {1, 2, 3, 4, Image.load("something.png") }

---

array [1][1] will be 1
array [1][2] will be 2
array [1][3] will be 3
array [1][4] will be 4
array [1][5] will be the loaded image.

---

yes, but i was talking about 1D arrays. :p

but thats very important too. so yeah.

Zitat:

---

Zitat von Grimfate126

yes, but i was talking about 1D arrays. :p

but thats very important too. so yeah.

---

1D arrays are exactly the same as well.

Code:

---

array = {1, 2, 3, 4, Image.load("something.png") }

---

array [1] will be 1
array [2] will be 2
array [3] will be 3
array [4] will be 4
array [5] will be the loaded image.

This is also the same as 3D, 4D, 5D, etc arrays.

Ok new error but same error message. Only happens when I press x though so it has something to do with the bullets.

Spoiler for Code:

Code:

---

--Aliens lua
--color variables
red = Color.new(255,0,0)
green = Color.new(0,255,0)
black = Color.new(0,0,0)
--for soldier bullets
bullet = Image.createEmpty(4,4)
bullet:clear(green)
--prevents random numbers bla bla
math.randomseed(os.time())
--table for loading alien pics
alienpic = {}
alienpic[1] = Image.load("pics/aliens/alienup.png")
alienpic[2] = Image.load("pics/aliens/aliendown.png")
alienpic[3] = Image.load("pics/aliens/alienleft.png")
alienpic[4] = Image.load("pics/aliens/alienright.png")
--table for soldier pics
soldierpic = {}
soldierpic[1] = Image.load("pics/soldier/soldierup.png")
soldierpic[2] = Image.load("pics/soldier/soldierdown.png")
soldierpic[3] = Image.load("pics/soldier/soldierleft.png")
soldierpic[4] = Image.load("pics/soldier/soldierright.png")
--table for soldier's x and y coordinates
soldier = {}
soldier[1] = {x = 230 , y = 130}
--alien's x and y coordinates
alien = {}
alien[1] = {x = 420, y = 250}
alien[2] = {x = 320, y = 720}
alien[3] = {x = 200, y = 150}
alien[4] = {x = 500, y = 210}
alien[5] = {x = 320, y = 123}
alien[6] = {x = 127, y = 480}
alien[7] = {x = 439, y = 200}
alien[8] = {x = 210, y = 657}
alien[9] = {x = 312, y = 780}
alien[10] = {x = 123, y = 67}
--which way is the soldier facing?
direction = 1
--is he alive?
soldieralive = "true"
--soldier health
shealth = 100
--alien health
ahealth = 100
--aliens alive?
alienalive1 = "true"
alienalive2 = "true"
alienalive3 = "true"
alienalive4 = "true"
alienalive5 = "true"
alienalive6 = "true"
alienalive7 = "true"
alienalive8 = "true"
alienalive9 = "true"
alienalive10 = "true"
--what way the aliens are facing
alien1d = 1
alien2d = 1
alien3d = 1
alien4d = 1
alien5d = 1
alien6d = 1
alien7d = 1
alien8d = 1
alien9d = 1
alien10d = 1
--bullet x and y
bullet = {}
bullet[1] = {x = soldier[1].x, y = soldier[1].y}
--start the main loop
while true do
screen:clear()
pad = Controls.read()
screen:print(0,0,shealth,red)
--first alien
if alienalive1 == "true" then
screen:blit(alien[1].x,alien[1].y,alienpic[alien1d])
end
--2nd alien
if alienalive2 == "true" then
screen:blit(alien[2].x,alien[2].y,alienpic[alien2d])
end
--third alien
if alienalive3 == "true" then
screen:blit(alien[3].x,alien[3].y,alienpic[alien3d])
end
-- fourth alien
if alienalive4 == "true" then
screen:blit(alien[4].x,alien[4].y,alienpic[alien4d])
end
--fifth alien
if alienalive5 == "true" then
screen:blit(alien[5].x,alien[5].y,alienpic[alien5d])
end
--6th alien
if alienalive6 == "true" then
screen:blit(alien[6].x,alien[6].y,alienpic[alien6d])
end
--7th alien
if alienalive7 == "true" then
screen:blit(alien[7].x,alien[7].y,alienpic[alien7d])
end
--8th alien
if alienalive8 == "true" then
screen:blit(alien[8].x,alien[8].y,alienpic[alien8d])
end
--9th alien
if alienalive9 == "true" then
screen:blit(alien[9].x,alien[9].y,alienpic[alien9d])
end
--10 alien
if alienalive10 == "true" then
screen:blit(alien[10].x,alien[10].y,alienpic[alien10d])
end
--blit the soldier to the screen if hes still alive
if soldieralive == "true" then
screen:blit(soldier[1].x,soldier[1].y,soldierpic[direction])
end
--fire guns
if pad:cross() then
gunfire = "true"
screen:blit(bullet[1].x,bullet[1].y,bullet)
end
if gunfire == "true" and direction == 1 then
bullet[1].y = bullet[1].y - 4
end
if gunfire == "true" and direction == 2 then
bullet[1].y = bullet[1].y + 4
end
if gunfire == "true" and direction == 3 then
bullet[1].x = bullet[1].x - 4
end
if gunfire == "true" and direction == 4 then
bullet[1].x = bullet[1].x + 4
end

--up
if pad:up() then
direction = 1
soldier[1].y = soldier[1].y - 3
end
--down
if pad:down() then
direction = 2
soldier[1].y = soldier[1].y + 3
end
--right
if pad:right() then
direction = 4
soldier[1].x = soldier[1].x + 3
end
--left
if pad:left() then
direction = 3
soldier[1].x = soldier[1].x - 3
end
--ai movement for all the aliens
--for the x coordinate
chasing = math.random(1,2)
--alien 1
if chasing == 1 and alien[1].x > soldier[1].x then
alien[1].x = alien[1].x - 1
alien1d = 3
end
if chasing == 1 and alien[1].x < soldier[1].x then
alien[1].x = alien[1].x + 1
alien1d = 4
end
--alien 2
if chasing == 1 and alien[2].x > soldier[1].x then
alien[2].x = alien[2].x - 1
alien2d = 3
end
if chasing == 1 and alien[2].x < soldier[1].x then
alien[2].x = alien[2].x + 1
alien2d = 4
end
--alien 3
if chasing == 1 and alien[3].x > soldier[1].x then
alien[3].x = alien[3].x - 1
alien3d = 3
end
if chasing == 1 and alien[3].x < soldier[1].x then
alien[3].x = alien[3].x + 1
alien3d = 4
end
--alien 4
if chasing == 1 and alien[4].x > soldier[1].x then
alien[4].x = alien[4].x - 1
alien4d = 3
end
if chasing == 1 and alien[4].x < soldier[1].x then
alien[4].x = alien[4].x + 1
alien4d = 4
end
--alien 5
if chasing == 1 and alien[5].x > soldier[1].x then
alien[5].x = alien[5].x - 1
alien5d = 3
end
if chasing == 1 and alien[5].x < soldier[1].x then
alien[5].x = alien[5].x + 1
alien5d = 4
end
--alien 6
if chasing == 1 and alien[6].x > soldier[1].x then
alien[6].x = alien[6].x - 1
alien6d = 3
end
if chasing == 1 and alien[6].x < soldier[1].x then
alien[6].x = alien[6].x + 1
alien6d = 4
end
--alien 7
if chasing == 1 and alien[7].x > soldier[1].x then
alien[7].x = alien[7].x - 1
alien7d = 3
end
if chasing == 1 and alien[7].x < soldier[1].x then
alien[7].x = alien[7].x + 1
alien7d = 4
end
--alien 8
if chasing == 1 and alien[8].x > soldier[1].x then
alien[8].x = alien[8].x - 1
alien8d = 3
end
if chasing == 1 and alien[8].x < soldier[1].x then
alien[8].x = alien[8].x + 1
alien8d = 4
end
--alien 9
if chasing == 1 and alien[9].x > soldier[1].x then
alien[9].x = alien[9].x - 1
alien9d = 3
end
if chasing == 1 and alien[9].x < soldier[1].x then
alien[9].x = alien[9].x + 1
alien9d = 4
end
--alien 10
if chasing == 1 and alien[10].x > soldier[1].x then
alien[10].x = alien[10].x - 1
alien10d = 3
end
if chasing == 1 and alien[10].x < soldier[1].x then
alien[10].x = alien[10].x + 1
alien10d = 4
end
----------------------------------------------------
--For the y coordinate
--alien 1
if chasing == 1 and alien[1].y > soldier[1].y then
alien[1].y = alien[1].y - 1
alien1d = 1
end
if chasing == 1 and alien[1].y < soldier[1].y then
alien[1].y = alien[1].y + 1
alien1d = 2
end
--alien 2
if chasing == 1 and alien[2].y > soldier[1].y then
alien[2].y = alien[2].y - 1
end
if chasing == 1 and alien[2].y < soldier[1].y then
alien[2].y = alien[2].y + 1
end
--alien 3
if chasing == 1 and alien[3].y > soldier[1].y then
alien[3].y = alien[3].y - 1
end
if chasing == 1 and alien[3].y < soldier[1].y then
alien[3].y = alien[3].y + 1
end
--alien 4
if chasing == 1 and alien[4].y > soldier[1].y then
alien[4].y = alien[4].y - 1
end
if chasing == 1 and alien[4].y < soldier[1].y then
alien[4].y = alien[4].y + 1
end
--alien 5
if chasing == 1 and alien[5].y > soldier[1].y then
alien[5].y = alien[5].y - 1
end
if chasing == 1 and alien[5].y < soldier[1].y then
alien[5].y = alien[5].y + 1
end
--alien 6
if chasing == 1 and alien[6].y > soldier[1].y then
alien[6].y = alien[6].y - 1
end
if chasing == 1 and alien[6].y < soldier[1].y then
alien[6].y = alien[6].y + 1
end
--alien 7
if chasing == 1 and alien[7].y > soldier[1].y then
alien[7].y = alien[7].y - 1
end
if chasing == 1 and alien[7].y < soldier[1].y then
alien[7].y = alien[7].y + 1
end
--alien 8
if chasing == 1 and alien[8].y > soldier[1].y then
alien[8].y = alien[8].y - 1
end
if chasing == 1 and alien[8].y < soldier[1].y then
alien[8].y = alien[8].y + 1
end
--alien 9
if chasing == 1 and alien[9].y > soldier[1].y then
alien[9].y = alien[9].y - 1
end
if chasing == 1 and alien[9].y < soldier[1].y then
alien[9].y = alien[9].y + 1
end
--alien 10
if chasing == 1 and alien[10].y > soldier[1].y then
alien[10].y = alien[10].y - 1
end
if chasing == 1 and alien[10].y < soldier[1].y then
alien[10].y = alien[10].y + 1
end




screen.waitVblankStart()
screen.flip()
end

---

screen:blit(bullet[1].x,bullet[1].y,bullet)

variable bullet is a table not an image.

ok so i have this code, that im working on, but when i run it i get this error

Code:

---

.lua:51: attempt to preform arithmetic on global "loop" <a nil value

---

any way here is my script....i cant figure out whats wrong

Code:

---

bg = Image.load("1.png")
PSP = Image.load("psp-very-small23.png")
mouse = Image.load("mouse.png")

--Tables

back = Image.createEmpty(480,272)
Back = {width=back:width(), height=back:height(), (bg) }
Back.x = 0
Back.y = 0

e1 = Image.createEmpty(27,11)
E1 = {width=e1:width(), height=e1:height(), (PSP) }
E1.x = 0
E1.y = 0

player = Image.createEmpty(19,19)
Player = { width=player:width(), height=player:height(), (mouse) }
Player.x = 200
Player.y = 200
--functions

function movePlayer()
pad = Controls.read()
if pad:left() then
Line.x = Line.x - 4
Player.x = Player.x - 4
end
if pad:right() then
Line.x = Line.x + 4
Player.x = Player.x + 4
end
if pad:up() then
Line.y = Line.y  - 4
Player.y = Player.y - 4
end
if pad:down() then
Line.y = Line.y + 4
Player.y = Player.y + 4
end
end

function collisionCheck(object, object2)
if (object2.x + object2.width > object.x) and (object2.x < object.x + object.width) and (object2.y + object2.height > object.y) and (object2.y < object.y + object.height) then
return 1
end
end
--variables
speed = 1
start = 0
-loop
while true do
if start == 0 then
E1.x = math.random(480)
E1.y = math.random(40,272)
start = math.random(4)
end
if start == 1 then
E1.x = E1.x - speed
end
if start == 2 then
E1.x = E1.x + speed
end
if start == 3 then
E1.y = E1.y - speed
end
if start == 4 then
E1.y = E1.y + speed
end
if E1.x < 0 or
E1.x > 480 or
E1.y < 0 or
E1.y > 272 then
start = 0
end
movePlayer()

screen:blit(Back.x,Back.y,bg)
screen:blit(E1.x,E1.y,PSP)
screen:blit(Player.x,Player.y,mouse)

if collisionCheck(Player,E1) then
speed = speed + 1
start = 0
end





screen.waitVblankStart()
screen.flip()
end

---

Zitat:

---

Zitat von the undead

--variables
speed = 1
start = 0
-loop
while true do

[/code]

---

This part, Your loop only has one "-", It needs to be
--loop

Zitat:

---

Zitat von Anti-QJ

This part, Your loop only has one "-", It needs to be
--loop

---

haha, thank you i didnt catch that lol

Bleh, took too long.

-loop

should be

--loop

Zitat:

---

Zitat von the undead

haha, thank you i didnt catch that lol

---

No problem, Everyone makes simple mistakes. I do all the time.
-= Double Post =-
[Edit]

Zitat:

---

Zitat von Anti-QJ

No problem, Everyone makes simple mistakes. I do all the time.
-= Double Post =-
Error

Code:

---

error: index.lua:57: <eof> expected near 'end'

---

Code

Code:

---

black = Color.new(0, 0, 0)
player = Image.load("player.png")
enemy = Image.load("enemy.png")
bg = Image.load("bg.png")
score = 0
math.randomseed(os.time())
Player = { x = 200, y = 124, player}
Enemy = { x = 272, y = 124, enemy}
screenwidth = 480
screenheight = 272

while true do
screen:clear()
pad = Controls.read()

if pad:left() and Player.x > -4 then
Player.x = Player.x - 3
end
if pad:right() and Player.x < screenwidth+4 then
Player.x = Player.x + 3
end
if pad:up() and Player.y > -4 then
Player.y = Player.y - 3
end
if pad:down() and Player.y < screenheight+4 then
Player.y = Player.y + 3
end
score = score + 1
if Enemy.x > Player.x and Enemy.x < screenwidth then
Enemy.x = Enemy.x + 2
elseif Enemy.x < Player.x and Enemy.x > 0 then
Enemy.x = Enemy.x - 2
end
end
if Enemy.y > Player.y and Enemy.y < screenheight then
Enemy.y = Enemy.y +2
elseif Enemy.y < Player.y and Enemy.y > 0 then
Enemy.y = Enemy.y -2
end

if Player.x == Enemy.x and Player.y == Enemy.y then
score = score + 0
screen:clear()
screen:print(340,8,"Your Score:"..score,black)
screen.flip()
screen.waitVblankStart(300)
screen:clear()
end

screen:blit(0,0, bg)
screen:blit(Player.x,Player.y, player)
screen:blit(Enemy.x,Enemy.y, enemy)
screen:print(10,10,"Score: "..score,black)

screen.waitVblankStart()
screen.flip()
end

---

---

2 "end"s are there. ;)

Ah, Thanks

I havent posted in here for along time, let alone needing help ;) but since Im stuck with LUA for now (to dev something efficiently) Im in need of some assistance.

Im wanting to fade from one image to another. Im certain I can figure this out on my own, but why reinvent the wheel, thats a saying, when I could use a pre-made one. So really, Im asking how to fill an image with a color...

Is it:

image:fill(color)?

I need a LUA function reference - C has faded my LUA memories :o

Heres sometyhing i found at psp-programming.com

Code:

---

nil image:fillRect(x, y, width, height, [color = transparent-black])

---

Draws a filled rectangle.



Maybe some editing of this can do it.

Just for, lets say a refleks game, is there a function like:

screen.waitVblankStart(25-150)

Or what else can you do?

Gameo - that should crash as you cant delay the vsync a negative amount.

Anti-Qj - If thats the case, then image;clear(color) should work, since the first part of the statement must mean the object to draw to... screen:clear your clearing the screen, image:clear your clearing the image, it all seems to add up... Im gonna try it now.

Ok whenever I press x my bullet appears but its very far away from my soldier and it only stays blitted as long as Im holding cross. Also I need help on doing collision for my aliens because when I set them to chase the player they all group into one alien and it looks like one alien is chasing me instead of 10.

Spoiler for CODE:

Code:

---

--Aliens lua
--color variables
red = Color.new(255,0,0)
green = Color.new(0,255,0)
black = Color.new(0,0,0)
--for soldier bullets
bulletp = Image.createEmpty(4,4)
bulletp:clear(green)
--prevents random numbers bla bla
math.randomseed(os.time())
--table for loading alien pics
alienpic = {}
alienpic[1] = Image.load("pics/aliens/alienup.png")
alienpic[2] = Image.load("pics/aliens/aliendown.png")
alienpic[3] = Image.load("pics/aliens/alienleft.png")
alienpic[4] = Image.load("pics/aliens/alienright.png")
--table for soldier pics
soldierpic = {}
soldierpic[1] = Image.load("pics/soldier/soldierup.png")
soldierpic[2] = Image.load("pics/soldier/soldierdown.png")
soldierpic[3] = Image.load("pics/soldier/soldierleft.png")
soldierpic[4] = Image.load("pics/soldier/soldierright.png")
--table for soldier's x and y coordinates
soldier = {}
soldier[1] = {x = 230 , y = 130}
--alien's x and y coordinates
alien = {}
alien[1] = {x = 420, y = 250}
alien[2] = {x = 320, y = 720}
alien[3] = {x = 200, y = 150}
alien[4] = {x = 500, y = 210}
alien[5] = {x = 320, y = 123}
alien[6] = {x = 127, y = 480}
alien[7] = {x = 439, y = 200}
alien[8] = {x = 210, y = 657}
alien[9] = {x = 312, y = 780}
alien[10] = {x = 123, y = 67}
--which way is the soldier facing?
direction = 1
--is he alive?
soldieralive = "true"
--soldier health
shealth = 100
--alien health
ahealth = 100
--aliens alive?
alienalive1 = "true"
alienalive2 = "true"
alienalive3 = "true"
alienalive4 = "true"
alienalive5 = "true"
alienalive6 = "true"
alienalive7 = "true"
alienalive8 = "true"
alienalive9 = "true"
alienalive10 = "true"
--what way the aliens are facing
alien1d = 1
alien2d = 1
alien3d = 1
alien4d = 1
alien5d = 1
alien6d = 1
alien7d = 1
alien8d = 1
alien9d = 1
alien10d = 1
--------------------------
---AI FUNCTION FOR ALIENS-
--------------------------
function aimovement()
--ai movement for all the aliens
--for the x coordinate
chasing = math.random(1,2)
--alien 1
if chasing == 1 and alien[1].x > soldier[1].x then
alien[1].x = alien[1].x - 1
alien1d = 3
end
if chasing == 1 and alien[1].x < soldier[1].x then
alien[1].x = alien[1].x + 1
alien1d = 4
end
--alien 2
if chasing == 1 and alien[2].x > soldier[1].x then
alien[2].x = alien[2].x - 1
alien2d = 3
end
if chasing == 1 and alien[2].x < soldier[1].x then
alien[2].x = alien[2].x + 1
alien2d = 4
end
--alien 3
if chasing == 1 and alien[3].x > soldier[1].x then
alien[3].x = alien[3].x - 1
alien3d = 3
end
if chasing == 1 and alien[3].x < soldier[1].x then
alien[3].x = alien[3].x + 1
alien3d = 4
end
--alien 4
if chasing == 1 and alien[4].x > soldier[1].x then
alien[4].x = alien[4].x - 1
alien4d = 3
end
if chasing == 1 and alien[4].x < soldier[1].x then
alien[4].x = alien[4].x + 1
alien4d = 4
end
--alien 5
if chasing == 1 and alien[5].x > soldier[1].x then
alien[5].x = alien[5].x - 1
alien5d = 3
end
if chasing == 1 and alien[5].x < soldier[1].x then
alien[5].x = alien[5].x + 1
alien5d = 4
end
--alien 6
if chasing == 1 and alien[6].x > soldier[1].x then
alien[6].x = alien[6].x - 1
alien6d = 3
end
if chasing == 1 and alien[6].x < soldier[1].x then
alien[6].x = alien[6].x + 1
alien6d = 4
end
--alien 7
if chasing == 1 and alien[7].x > soldier[1].x then
alien[7].x = alien[7].x - 1
alien7d = 3
end
if chasing == 1 and alien[7].x < soldier[1].x then
alien[7].x = alien[7].x + 1
alien7d = 4
end
--alien 8
if chasing == 1 and alien[8].x > soldier[1].x then
alien[8].x = alien[8].x - 1
alien8d = 3
end
if chasing == 1 and alien[8].x < soldier[1].x then
alien[8].x = alien[8].x + 1
alien8d = 4
end
--alien 9
if chasing == 1 and alien[9].x > soldier[1].x then
alien[9].x = alien[9].x - 1
alien9d = 3
end
if chasing == 1 and alien[9].x < soldier[1].x then
alien[9].x = alien[9].x + 1
alien9d = 4
end
--alien 10
if chasing == 1 and alien[10].x > soldier[1].x then
alien[10].x = alien[10].x - 1
alien10d = 3
end
if chasing == 1 and alien[10].x < soldier[1].x then
alien[10].x = alien[10].x + 1
alien10d = 4
end
----------------------------------------------------
--For the y coordinate
--alien 1
if chasing == 1 and alien[1].y > soldier[1].y then
alien[1].y = alien[1].y - 1
alien1d = 1
end
if chasing == 1 and alien[1].y < soldier[1].y then
alien[1].y = alien[1].y + 1
alien1d = 2
end
--alien 2
if chasing == 1 and alien[2].y > soldier[1].y then
alien[2].y = alien[2].y - 1
end
if chasing == 1 and alien[2].y < soldier[1].y then
alien[2].y = alien[2].y + 1
end
--alien 3
if chasing == 1 and alien[3].y > soldier[1].y then
alien[3].y = alien[3].y - 1
end
if chasing == 1 and alien[3].y < soldier[1].y then
alien[3].y = alien[3].y + 1
end
--alien 4
if chasing == 1 and alien[4].y > soldier[1].y then
alien[4].y = alien[4].y - 1
end
if chasing == 1 and alien[4].y < soldier[1].y then
alien[4].y = alien[4].y + 1
end
--alien 5
if chasing == 1 and alien[5].y > soldier[1].y then
alien[5].y = alien[5].y - 1
end
if chasing == 1 and alien[5].y < soldier[1].y then
alien[5].y = alien[5].y + 1
end
--alien 6
if chasing == 1 and alien[6].y > soldier[1].y then
alien[6].y = alien[6].y - 1
end
if chasing == 1 and alien[6].y < soldier[1].y then
alien[6].y = alien[6].y + 1
end
--alien 7
if chasing == 1 and alien[7].y > soldier[1].y then
alien[7].y = alien[7].y - 1
end
if chasing == 1 and alien[7].y < soldier[1].y then
alien[7].y = alien[7].y + 1
end
--alien 8
if chasing == 1 and alien[8].y > soldier[1].y then
alien[8].y = alien[8].y - 1
end
if chasing == 1 and alien[8].y < soldier[1].y then
alien[8].y = alien[8].y + 1
end
--alien 9
if chasing == 1 and alien[9].y > soldier[1].y then
alien[9].y = alien[9].y - 1
end
if chasing == 1 and alien[9].y < soldier[1].y then
alien[9].y = alien[9].y + 1
end
--alien 10
if chasing == 1 and alien[10].y > soldier[1].y then
alien[10].y = alien[10].y - 1
end
if chasing == 1 and alien[10].y < soldier[1].y then
alien[10].y = alien[10].y + 1
end
end
---------------------
---END OF FUNCTION___
------------------___
---------------------

--bullet x and y
bullet = {}
bullet[1] = {x = soldier[1].x, y = soldier[1].y}
--start the main loop
while true do
screen:clear()
pad = Controls.read()
screen:print(0,0,shealth,red)
--first alien
if alienalive1 == "true" then
screen:blit(alien[1].x,alien[1].y,alienpic[alien1d])
end
--2nd alien
if alienalive2 == "true" then
screen:blit(alien[2].x,alien[2].y,alienpic[alien2d])
end
--third alien
if alienalive3 == "true" then
screen:blit(alien[3].x,alien[3].y,alienpic[alien3d])
end
-- fourth alien
if alienalive4 == "true" then
screen:blit(alien[4].x,alien[4].y,alienpic[alien4d])
end
--fifth alien
if alienalive5 == "true" then
screen:blit(alien[5].x,alien[5].y,alienpic[alien5d])
end
--6th alien
if alienalive6 == "true" then
screen:blit(alien[6].x,alien[6].y,alienpic[alien6d])
end
--7th alien
if alienalive7 == "true" then
screen:blit(alien[7].x,alien[7].y,alienpic[alien7d])
end
--8th alien
if alienalive8 == "true" then
screen:blit(alien[8].x,alien[8].y,alienpic[alien8d])
end
--9th alien
if alienalive9 == "true" then
screen:blit(alien[9].x,alien[9].y,alienpic[alien9d])
end
--10 alien
if alienalive10 == "true" then
screen:blit(alien[10].x,alien[10].y,alienpic[alien10d])
end
--blit the soldier to the screen if hes still alive
if soldieralive == "true" then
screen:blit(soldier[1].x,soldier[1].y,soldierpic[direction])
end
--fire guns
if pad:cross() then
gunfire = "true"
screen:blit(bullet[1].x,bullet[1].y,bulletp)
end
if gunfire == "true" and direction == 1 then
bullet[1].y = bullet[1].y - 4
end
if gunfire == "true" and direction == 2 then
bullet[1].y = bullet[1].y + 4
end
if gunfire == "true" and direction == 3 then
bullet[1].x = bullet[1].x - 4
end
if gunfire == "true" and direction == 4 then
bullet[1].x = bullet[1].x + 4
end
--call the function for ai movement
aimovement()
--up
if pad:up() then
direction = 1
soldier[1].y = soldier[1].y - 3
end
--down
if pad:down() then
direction = 2
soldier[1].y = soldier[1].y + 3
end
--right
if pad:right() then
direction = 4
soldier[1].x = soldier[1].x + 3
end
--left
if pad:left() then
direction = 3
soldier[1].x = soldier[1].x - 3
end
screen.waitVblankStart()
screen.flip()
end

---

What should i type then for a random timer between (something-something)??

GuitarGod - I rather not create your game - sorry. But seriously, re-read your code. If your chase the player code is the problem, look at it. Im certain your setting all 10 aliens the same X and Y values thus creating hte one alien effect. AS for collision, contrary to popular belief, its quite easy. Search these forums for a LUA bounding box collision. As for bullets, thats asked sooooooo many times its almost a stereotype, if not already, for every LUA user to ask for help on making it... Just search or look at that evilmania thing, if not already.

Anyways, im still thinking up methods of fading, but i cant seem to set an image to transparent completely, ratheri can only set an image to a completely black color and a transprency %. Know of any LUA app that fades from one image to another?

EDIT

Gameo -

RanNumber = math.random(1,100)
-- get random number between 1 and 100

Zitat:

---

Zitat von SG57

RanNumber = math.random(1,100)

---

So that's it?! Eaasy, i love Lua!

But seriously, even though almost everyone can release a refleks game with 2 images and a little code, im gonna put more work into this.

(Don't want my first release to be crappy.)

thats the way start simple and work your way up
my first game was a rock, scissors, paper simple but i got a lot out of it.

Zitat:

---

Zitat von mafia1ft

thats the way start simple and work your way up
my first game was a rock, scissors, paper simple but i got a lot out of it.

---

Yes, and ty.

Lol. yah that game was just off the top of my head. Anyways My ai is fine they all follow the player like I want but I have to implement collision because when they all follow the player after a while they turn into one lol. And I saw a tut on evil that ill try for bullets but for collision its something wierd like.


if (Player.x + playerWidth > object.x) and (Player.x < object.x + object.width) and (Player.y + playerHeight > object.y) and (Player.y < object.y + object.height) then

But what is object.height and stuff. Are they variables? or are they somekind of statement? and playerwidth and hieght are variables right? In the evilmana tut he never declares object.height or width.