Lua help

[Robertlatacz]

Hi, I've just started learning Lua and need someone to go over my code because i keep getting an error.
The error is:

LuaScript.Lua:15:attempt to index global 'control' (a nil value)

Here is my Script:

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

player = Image.createEmpty(35,10)
player:clear(red)

playerHeight = 10
playerWidth = 35

while true do

screen:clear()

screen:blit(240, 11, player)

pad = Control.read()

if pad:left()then
PLayer.x = Player.x - 1
end

if pad:right() then
Player.x = Player.x + 1
end

screen.waitVblankStart()
screen.flip()
end

If there are any other problems with my Script can you post them. Thanks in advance.

[jak66]

analysis
LuaScript.Lua:15 - this means error is on line 15

line 15 - pad = Control.read()
it should be pad = Controls.read()

problem now is you get errors when you press left or right

[Robertlatacz]

Thanks for the help but what can i do to get my left and right buttons to work?

[Nicko01]

try

"if pad:left() then
player.x = player.x - 1
end"

I think caps mess it up and there needs to be a space after the "()" before "then"

[Nicko01]

Heres 1 with 2 players
(you need the images or it won't work.)

grass = Image.load("grass.png")
player = Image.load("player.png")
flower = Image.load("flower.png")
screenwidth = 480 - player:width()
screenheight = 272 - player:width()
Player = { }
Player[1] = { x = 200, y = 50 }
Player[2] = { x = 125, y = 20
while true do
pad = Controls.read()
screen:clear()
for a = 0, 14 do
for b = 0,8 do
screen:blit(32 * a, 32 * b, grass)
end
end
screen:blit(100,100,flower)
screen:blit(300,220,flower)
screen:blit(Player[1].x,Player[1].y,player)
screen:blit(Player[2].x,Player[2].y,player)
if pad:left() and Player[1].x > 0 then
Player[1].x = Player[1].x - 2
end

if pad:right() and Player[1].x < screenwidth then
Player[1].x = Player[1].x + 2
end

if pad:up() and Player[1].y > 0 then
Player[1].y = Player[1].y - 2
end

if pad:down() and Player[1].y < screenheight then
Player[1].y = Player[1].y + 2
end

if pad:square() and Player[2].x > 0 then
Player[2].x = Player[2].x - 2
end

if pad:circle() and Player[2].x < screenwidth then
Player[2].x = Player[2].x + 2
end

if pad:triangle() and Player[2].y > 0 then
Player[2].y = Player[2].y - 2
end

if pad:cross() and Player[2].y < screenheight then
Player[2].y = Player[2].y + 2
end
screen.waitVblankStart()
screen.flip()
end

[Robertlatacz]

Is there a way to get my left and right to work without having to load the image?

The error is: LuaScript.Lua :18: attempt to index global 'Player' (a nil value)

[yaustar]

You can change the image loading with full coloured squares like you did before.

[jak66]

heres your code rewritten and working on lua player 0.17dk2. dont see why it shouldnt workon other versions

red = Color.new(255,0,0)
PlayerWidth = 35
PlayerHeight = 10
Player = Image.createEmpty(PlayerWidth,PlayerHeight)
Player:clear(red
Playerx = 240
Playery = 11

while true do
screen:clear()
screen:blit(Playerx,Playery,Player)
pad = Controls.read()
--Digital Pad Movement
if pad:left() then
Playerx = Playerx - 1
end
if pad:right() then
Playerx = Playerx + 1
end
if pad:up() then
Playery = Playery - 1
end
if pad:down() then
Playery = Playery + 1
end
--Analogue Pad Movement
if pad:analogY() < -35 then
Playery = Playery - 5
end
if pad:analogY() > 35 then
Playery = Playery + 5
end
if pad:analogX() < -36 then
Playerx = Playerx - 5
end
if pad:analogX() > 35 then
Playerx = Playerx + 5
end
--Collision
if Playerx < 0 then
Playerx = 0
end
if Playerx > 480 - PlayerWidth then
Playerx = 480 - PlayerWidth
end
if Playery < 0 then
Playery = 0
end
if Playery > 272 - PlayerHeight then
Playery = 272 - PlayerHeight
end
--End game
if pad:select() then break
end
screen.waitVblankStart()
screen.flip()
end