Lua Programming Help Thread

I dont understand, I want my jump sprites to show when I jump, but they wont show! There was no error, but my jump sprites dont show!

Zitat:

---

Background = Image.load("sunshine_bg.p ng")
green=Color.new(255,0,0)
rgreen=Color.new(0,255,0)
white = Color.new(255,255,255)
MarioScore = 0
LuigiScore = 0
Music.playFile("mus1.it")
player1 = Image.load("mario_left.pn g")
player2 = Image.load("mario_right.p ng")
playerjumpleft = Image.load("mario_jump_le ft.png")
playerjumpright = Image.load("mario_jump_ri ght.png")
luigijumpleft = Image.load("luigi_jump_le ft.png")
luigijumpright = Image.load("luigi_jump_ri ght.png")
luigi1 = Image.load("luigi_left.pn g")
luigi2 = Image.load("luigi_right.p ng")
playerimage = player2
luigiimage = luigi1
math.randomseed(os.time() )
keyimage = Image.load("key.png")
displayTime = math.random(20,500)
counter = 0
screen:blit(0,0,Backgroun d)
screen:blit(0,0,playerima ge)
screen:blit(0,0,luigiimag e)
ground = Image.createEmpty(480,14)
ground:clear(green)

player = {}
player.gravity = 230
player.y = 230
player.x = 50
player.jumpspeed = 10
player.jumpstate = "ground"

luigi = {}
luigi.gravity = 230
luigi.y = 230
luigi.x = 50
luigi.jumpspeed = 10
luigi.jumpstate = "ground"
key = {}
key.x = math.random(1,3)
key.y = math.random (1,3)

while true do
pad = Controls.read()
counter = counter + 1
if counter >= displayTime then
key.x = math.random(1,3)
key.y = math.random (1,3)
if key.x == 1 then
key.x = 224
end
if key.x == 1 then
key.y = 182
end

if key.x == 2 then
key.x = 60
end
if key.x == 2 then
key.y = 132
end

if key.x == 3 then
key.x = 404
end
if key.y == 3 then
key.y = 154
end

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


if player.x > 480 then
Mario.x = 480
end
if player.x < 0 then
Mario.x = 0
end

if luigi.x > 480 then
luigi.x = 480
end
if luigi.x < 0 then
luigi.x = 0
end

if pad:left() then
playerimage = player1
player.x = player.x - 2
end
if pad:right() then
playerimage = player2
player.x = player.x + 2
end

if pad:up() and player.jumpstate == "ground" then player.jumpstate = "jumping" end

if player.jumpstate == "jumping" then
player.jumpspeed = player.jumpspeed - 0.5
player.gravity = player.gravity - player.jumpspeed
end

if player.gravity < 0 then
player.jumpstate = "falling"
end

if player.gravity < 230 and player.jumpstate == "falling" then
player.gravity = player.gravity + (player.jumpspeed + 3)
end

if player.gravity == 230 then
player.jumpspeed = 10
player.jumpstate = "ground"
end

if player.gravity > 230 then player.gravity = 230 end

player.y = player.gravity

if pad:square() then
luigiimage = luigi1
luigi.x = luigi.x - 2
end
if pad:circle() then
luigiimage = luigi2
luigi.x = luigi.x + 2
end

if pad:triangle() and luigi.jumpstate == "ground" then luigi.jumpstate = "jumping" end

if luigi.jumpstate == "jumping" then
luigi.jumpspeed = luigi.jumpspeed - 0.5
luigi.gravity = luigi.gravity - luigi.jumpspeed
end

if luigi.gravity < 0 then
luigi.jumpstate = "falling"
end

if luigi.gravity < 230 and luigi.jumpstate == "falling" then
luigi.gravity = luigi.gravity + (luigi.jumpspeed + 3)
end

if luigi.gravity == 230 then
luigi.jumpspeed = 10
luigi.jumpstate = "ground"
end

if luigi.gravity > 230 then luigi.gravity = 230 end

luigi.y = luigi.gravity

if pad:up() and player.jumpstate == "ground" and playerimage == player1 then
playerimage = playerjumpleft
end
if pad:up() and player.jumpstate == "ground" and playerimage == player2 then
playerimage = playerjumpright
end
if playerimage == playerjumpleft and player.jumpstate == "jumping" then
playerimage = player1
end
if playerimage == playerjumpright and player.jumpstate == "jumping" then
playerimage = player2
end

if pad:triangle() and luigi.jumpstate == "ground" and luigiimage == luigi1 then
luigiimage = luigijumpleft
end
if pad:triangle() and luigi.jumpstate == "ground" and luigiimage == luigi2 then
luigiimage = luigijumpright
end
if luigiimage == luigijumpleft and luigi.jumpstate == "jumping" then
luigiimage = luigi1
end
if luigiimage == luigijumpright and luigi.jumpstate == "jumping" then
luigiimage = luigi2
end
screen:blit(0,0,Backgroun d)
screen:blit(key.x, key.y, keyimage)
screen:blit(player.x,play er.y,playerimage)
screen:blit(luigi.x,luigi .y,luigiimage)
screen:blit(0,262,ground)
screen:print(30,20,"Mario 's Score: "..MarioScore,green)
screen:print(30,50,"Luigi 's Score: "..LuigiScore,rgreen)
screen.waitVblankStart()
screen.flip()
end

---

Code:

---

if pad:triangle() and luigi.jumpstate == "ground" then luigi.jumpstate = "jumping" end

---

Right, here you say if the pad has triangle pressed and the jumpstate is "ground" then change jumpstate to "jumping".
At this point in code, triangle has been pressed and the jumpstate is "jumping". A couple of lines down...

Code:

---

if pad:triangle() and luigi.jumpstate == "ground" and luigiimage == luigi1 then
luigiimage = luigijumpleft
end

---

The image will never change to "luigijumpleft" since the jumpstate is now "jumping" rather then "ground". But.....

Code:

---

if luigiimage == luigijumpleft and luigi.jumpstate == "jumping" then
luigiimage = luigi1
end

---

Even then it still won't show since at this point of code in the loop, the luigiimage is now "luigijumpleft" and the jumpstate is still "jumping", the luigiimage is chnaged BACK to "luigi1" before it is blitted to the screen.

I would get rid of the last 2 bits of code. I would also prefer to have a variable that holds the players current direction rather then check the current image but using your current system, change the first bit of code to:

Code:

---

if pad:triangle() and luigi.jumpstate == "ground" then
luigi.jumpstate = "jumping"
if lugiimage == luigi1 then
luigiimage = luigijumpleft
else
luigiimage = luigijumpright
end
end

---

I let you deal with changing the sprite when the player lands as an exercise to see if you understand the fixes that I have done.

I need to make the object that i collided with dissappear, make the score go up by one and make the object reappear in a random position on the PSP screen. The variables for random x and random y are 'rx and 'ry'. The player is called 'smiley' the object is called 'sad' the dimensions for both of these are 38 x 38. so please can you help me! some code would be nice

Are you serious? Unless you have had a decent go at the code yourself, I don't think anyone is going to just give you the code like that. By doing so, you are not learning anything.

These should help you:
http://evilmana.com/tutorials/lua_tutorial_12.php - box collision detection
http://lua-users.org/wiki/MathLibraryTutorial - random numbers

i will learn, im am currently a learner, if someone writes i will look throught it and understand. I just dunno where to put it all. Is it gonna be something like "if smiley.x + smileyWidth > sad.x then' rite?? i could make it all a function, but i dunno where to put the function. I dunno how to make an object delete then reappear somewhere else with the random variables, it appears first in the game when you start it as:

Code:

---

screen:blit(rx,ry,sad)

and the variables are:

rx = math.random(0,442)
ry = math.random(0,234)

---

I just posted two links in my previous post to help you with your problem. You are never going to learn unless you have a decent shot at it yorself. Learning how to program is about solving problems. I will not give any advice unless you have a decent shot at this yourself and post some code.

Hint: You are not deleting the object and making it reappear, you are moving it (aka changing the X and Y variable positions)

look at all the stuff ive done so far, btw, ive tried the collision thing, i still dont know how to make the object delete:

Code:

---

--Smiley
--JaSo PsP

red = Color.new(255,0,0)
background = Image.load("cloud.png")
smiley = Image.load("smile.png")
sad = Image.load("sad.png")
math.randomseed(os.time())
rx = math.random(0,442)
ry = math.random(0,234)
boost = 1000

x = 0
y = 5

function booster()
boost = boost - 1
end

while true do

screen:clear()

screen:blit(0,0,background)
screen:print(0,263,"Press X for SPEED BOOST",red)
screen:print(0,0,"Boost Left: "..boost ,red)
screen:blit(x, y, smiley)
screen:blit(rx, ry, sad)

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

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

if pad:down() then
y = y + 1
end

if pad:up() then
y = y - 1
end

if pad:right() and pad:cross() then
x = x + 3
booster()
end

if pad:left() and pad:cross() then
x = x - 3
booster()
end

if pad:down() and pad:cross() then
y = y + 3
booster()
end

if pad:up() and pad:cross() then
y = y - 3
booster()
end

if pad:start() then
return
end

if x > 442 then
x = 442
end

if y > 234 then
y = 234
end

if x < -2 then
x = -2
end

if y < -2 then
y = -2
end

screen.waitVblankStart()
screen:flip()
end

---

Sorry, but I don't see any where in that code where you have tried to do any collision. I would at least like to see your attempt at it.

ill see what i can do..

Spoiler for To save me posting it up later:

Code:

---

--Smiley
--JaSo PsP

red = Color.new(255,0,0)
background = Image.load("cloud.png")
smiley = Image.load("smile.png")
sad = Image.load("sad.png")
math.randomseed(os.time())
rx = math.random(0,442)
ry = math.random(0,234)
boost = 1000
score = 0
x = 0
y = 5

function booster()
boost = boost - 1
end

function CheckBoxCollisionHack()
        if ((x + 38) > rx) and (x < (rx + 38)) then
                if ((y + 38) > ry) and (y < (ry + 38)) then
                        return true
                end
        end
       
        return false
end

while true do

screen:clear()

screen:blit(0,0,background)
screen:print(0,263,"Press X for SPEED BOOST",red)
screen:print(0,0,"Boost Left: "..boost ,red)
screen:blit(x, y, smiley)
screen:blit(rx, ry, sad)

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

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

if pad:down() then
y = y + 1
end

if pad:up() then
y = y - 1
end

if pad:right() and pad:cross() then
x = x + 3
booster()
end

if pad:left() and pad:cross() then
x = x - 3
booster()
end

if pad:down() and pad:cross() then
y = y + 3
booster()
end

if pad:up() and pad:cross() then
y = y - 3
booster()
end

if pad:start() then
return
end

if x > 442 then
x = 442
end

if y > 234 then
y = 234
end

if x < -2 then
x = -2
end

if y < -2 then
y = -2
end

if CheckBoxCollisionHack() then
        rx = math.random(0,442)
        ry = math.random(0,234)
        score = score + 1
end

screen.waitVblankStart()
screen:flip()
end

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