Lua problems

[splodger15]

Would i use it like this

------------------------------------------------------------------
car2=Image.load("images/car2.PNG")
car2=car2

[drEDN4wt]

as before.....

you havent declared road

instead of;
background=Image.load("images/road.PNG")

use;
road=Image.load("images/road.PNG")
background=road

maybe you dont need background at all.
do you ever forget where you put things or peoples names?

don't use car2=car2 ever

[splodger15]

Here is my script so far,but i seemed to get this error now:

--------------------------------------------------------------
error:script.LUA:6: attempt to call method 'width' (a nil value)
-----------------------------------------------------------------

-- Created by splodger15


----------detect other cars collision--------------
function detectCollision(player, opponent)
if (player.x + character:width() > opponent.x) and (player.x < opponent.x + opponent.pic:width()) and (player.y + character:height() > opponent.y) and (player.y < opponent.y + opponent.pic:height()) then
screen.waitVblankStart(60)
dofile("menu.lua")
end
end

Room_width = 480
Room_height = 272
player1x = 15
player1y = 136
road=Image.load("images/road.PNG")
background=road
car1=Image.load("images/car1.PNG")
player1=car1
car2=Image.load("images/car2.PNG")
car3=Image.load("images/car3.PNG")
car4=Image.load("images/car4.PNG")

----------walls------------

wall1 = Image.createEmpty(480,2)
wall2 = Image.createEmpty(2,272)
wall3 = Image.createEmpty(2,272)
wall4 = Image.createEmpty(480,2)

wall1 = {x = 0, y = 0, height = wall1:height(), width = wall1:width() }
wall2 = {x = 450, y = 0, height = wall2:height(), width = wall2:width() }
wall3 = {x = 0, y = 0, height = wall3:height(), width = wall3:width() }
wall4 = {x = 0, y = 299, height = wall4:height(), width = wall4:width() }



player = {}
player.x = 250
player.y = 100
playerHeight = 63
playerWidth = 33

car2 = {}
car2.x = 128
car2.y = 90
car2Height = 63
car2Width = 33
car2.pic = car2

car3 = {}
car3.x = 228
car3.y = 20
car3Height = 63
car3Width = 33
car3.pic = car3

car4 = {}
car4.x = 28
car4.y = 20
car4Height = 63
car4Width = 33
car4.pic = car4

character = car1


------------------player sprite loading--------------

function rands1()
rand2 = math.random(1,3)


if rand2 ==1 then
car2.pic = car2
end

if rand2 ==2 then
car3.pic = car3
end

if rand2 ==3 then
car4.pic = car4
end
end

function rands2()
rand3 = math.random(1,3)


if rand3 ==1 then
car2.pic = car2
end

if rand3 ==2 then
car3.pic = car3
end

if rand3 ==3 then
car4.pic = car4
end
end

function rands3()
rand4 = math.random(1,3)


if rand4 ==1 then
car2.pic = car2
end

if rand4 ==2 then
car3.pic = car3
end

if rand4 ==3 then
car4.pic = car4
end
end


XScrollPosition = 480

numberOfScrolls = 0

while true do
math.randomseed(os.time() )
rand=math.random(1,3)
random1 =math.random(20,25)
random2 =math.random(90,95)
random3 =math.random(192,197)

pad = Controls.read()
screen:clear()

oldx = player.x
oldy = player.y
screen:clear()

if pad:left() then
character = car1
player.x = player.x - 2
end

if pad:right() then
character = car1
XScrollPosition = XScrollPosition - 10
if XScrollPosition < 0 then
XScrollPosition = XScrollPosition + 480
numberOfScrolls = numberOfScrolls + 1
end
end

if pad:up() then
character = car1
player.y = player.y - 2
end

if pad:down() then
character = car1
player.y = player.y + 2
end

if pad:triangle() then
dofile("index1.lua")
end

if pad:square() then
Image:save("screenshot.png")
end

if pad:start() then
break
end


if rand ==1 then
car2.x = car2.x -10
car3.x = car3.x-10
car4.x = car3.x-10
end

if rand ==2 then
car2.x = car2.x -10
car3.x = car3.x-10
car4.x = car3.x-10
end

if rand ==3 then
car2.x = car2.x -10
car3.x = car3.x-10
car4.x = car3.x-10
end

if car2.x <=0 then
car2.x =510
car2.y = random1
rands1()
end

if car3.x <=0 then
car3.x = 520
car3.y = random2
rands2()
end

if car4.x <=0 then
car4.x = 500
car4.y = random3
rands3()
end

screen:clear()

screen:blit(XScrollPosition, 0, road)

if XScrollPosition > 0 then
screen:blit(XScrollPosition - 480, 0, road)
else
screen:blit(XScrollPosition + 480, 0, road)
end

if numberOfScrolls > 30 then
dofile("eol.lua")
end

if player.x > 448 then
Player.x = 448
end
if player.x < 0 then
player.x = 0
end

if player.y > 240 then
player.y = 240
end
if player.y < 0 then
player.y = 0
end


detectCollision(player, car2)
detectCollision(player, car3)
detectCollision(player, car4)

-----------blit background and player------------

screen:blit(player.x, player.y, character)
screen:blit(car2.x, car2.y, car2.pic)
screen:blit(car3.x, car3.y, car3.pic)
screen:blit(car4.x, car4.y, car4.pic)
screen.flip()
screen.waitVblankStart()
end
------------------------------------------------------------------

[yaustar]

You are assigning an object to a member of itself:
car2=Image.load("images/car2.PNG") -- car2 is an image
car2 = {} -- car2 is no longer an image and now a table
car2.x = 128
car2.y = 90
car2Height = 63
car2Width = 33
car2.pic = car2 -- car2.pic is now car2. Major logic flaw here.

[Zack3008]

maybe put some stuff after(with all the "if"s and everything) "while true do"??(especially the "rand"s)

[splodger15]

How can i fix this

Thanks

[yaustar]

car2 = {}
car2.x = 128
car2.y = 90
car2Height = 63
car2Width = 33
car2.pic = Image.load("images/car2.PNG")

This will solve one of your problems.

[splodger15]

How many problems are there iam am still getting this :error:script.LUA:6: attempt to call method 'width' (a nil value)

================================================== =====

-- Created by splodger15


----------detect other cars collision--------------
function detectCollision(player, opponent)
if (player.x + character:width() > opponent.x) and (player.x < opponent.x + opponent.pic:width()) and (player.y + character:height() > opponent.y) and (player.y < opponent.y + opponent.pic:height()) then
screen.waitVblankStart(60)
dofile("menu.lua")
end
end

Room_width = 480
Room_height = 272
player1x = 15
player1y = 136
road=Image.load("images/road.PNG")
background=road
car1=Image.load("images/car1.PNG")
player1=car1
car2 = {}
car2.x = 128
car2.y = 90
car2Height = 63
car2Width = 33
car2.pic = Image.load("images/car2.PNG")
car3=Image.load("images/car3.PNG")
car4=Image.load("images/car4.PNG")

----------walls------------

wall1 = Image.createEmpty(480,2)
wall2 = Image.createEmpty(2,272)
wall3 = Image.createEmpty(2,272)
wall4 = Image.createEmpty(480,2)

wall1 = {x = 0, y = 0, height = wall1:height(), width = wall1:width() }
wall2 = {x = 450, y = 0, height = wall2:height(), width = wall2:width() }
wall3 = {x = 0, y = 0, height = wall3:height(), width = wall3:width() }
wall4 = {x = 0, y = 299, height = wall4:height(), width = wall4:width() }



player = {}
player.x = 250
player.y = 100
playerHeight = 63
playerWidth = 33

car2 = {}
car2.x = 128
car2.y = 90
car2Height = 63
car2Width = 33
car2.pic = car2

car3 = {}
car3.x = 228
car3.y = 20
car3Height = 63
car3Width = 33
car3.pic = car3

car4 = {}
car4.x = 28
car4.y = 20
car4Height = 63
car4Width = 33
car4.pic = car4

character = car1


------------------player sprite loading--------------

function rands1()
rand2 = math.random(1,3)


if rand2 ==1 then
car2.pic = car2
end

if rand2 ==2 then
car3.pic = car3
end

if rand2 ==3 then
car4.pic = car4
end
end

function rands2()
rand3 = math.random(1,3)


if rand3 ==1 then
car2.pic = car2
end

if rand3 ==2 then
car3.pic = car3
end

if rand3 ==3 then
car4.pic = car4
end
end

function rands3()
rand4 = math.random(1,3)


if rand4 ==1 then
car2.pic = car2
end

if rand4 ==2 then
car3.pic = car3
end

if rand4 ==3 then
car4.pic = car4
end
end


XScrollPosition = 480

numberOfScrolls = 0

while true do
math.randomseed(os.time() )
rand=math.random(1,3)
random1 =math.random(20,25)
random2 =math.random(90,95)
random3 =math.random(192,197)

pad = Controls.read()
screen:clear()

oldx = player.x
oldy = player.y
screen:clear()

if pad:left() then
character = car1
player.x = player.x - 2
end

if pad:right() then
character = car1
XScrollPosition = XScrollPosition - 10
if XScrollPosition < 0 then
XScrollPosition = XScrollPosition + 480
numberOfScrolls = numberOfScrolls + 1
end
end

if pad:up() then
character = car1
player.y = player.y - 2
end

if pad:down() then
character = car1
player.y = player.y + 2
end

if pad:triangle() then
dofile("index1.lua")
end

if pad:square() then
Image:save("screenshot.png")
end

if pad:start() then
break
end


if rand ==1 then
car2.x = car2.x -10
car3.x = car3.x-10
car4.x = car3.x-10
end

if rand ==2 then
car2.x = car2.x -10
car3.x = car3.x-10
car4.x = car3.x-10
end

if rand ==3 then
car2.x = car2.x -10
car3.x = car3.x-10
car4.x = car3.x-10
end

if car2.x <=0 then
car2.x =510
car2.y = random1
rands1()
end

if car3.x <=0 then
car3.x = 520
car3.y = random2
rands2()
end

if car4.x <=0 then
car4.x = 500
car4.y = random3
rands3()
end

screen:clear()

screen:blit(XScrollPosition, 0, road)

if XScrollPosition > 0 then
screen:blit(XScrollPosition - 480, 0, road)
else
screen:blit(XScrollPosition + 480, 0, road)
end

if numberOfScrolls > 30 then
dofile("eol.lua")
end

if player.x > 448 then
Player.x = 448
end
if player.x < 0 then
player.x = 0
end

if player.y > 240 then
player.y = 240
end
if player.y < 0 then
player.y = 0
end


detectCollision(player, car2)
detectCollision(player, car3)
detectCollision(player, car4)

-----------blit background and player------------

screen:blit(player.x, player.y, character)
screen:blit(car2.x, car2.y, car2.pic)
screen:blit(car3.x, car3.y, car3.pic)
screen:blit(car4.x, car4.y, car4.pic)
screen.flip()
screen.waitVblankStart()
end

[yaustar]

car2, car3 and car4 .pics are not images. Therefore when you try and call the width() function from them, it is a nil value.

[splodger15]

Can someone please Explain how to fix this issue thanks