Lua Programming Help Thread

Zitat:

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Zitat von JaSo PsP

how do i make an image move using the arrow keys? my image is called "smiley" so some code would be nice :)

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Code:

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smiley = Image.load("smiley.png")

x = 0
y = 0

while true do

screen:clear()

screen:blit(x, y, smiley)

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:right() then
y = y - 1
end

screen.waitVblankStart()
screen:flip()
end

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Zitat:

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Zitat von Grimfate126

Code:

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smiley = Image.load("smiley.png")

x = 0
y = 0

while true do

screen:clear()

screen:blit(x, y, smiley)

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:right() then
y = y - 1
end

screen.waitVblankStart()
screen:flip()
end

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thanx

ps: u forgot:

Code:

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pad = Controls.read()

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plus u got the directions all wrong, up doesnt work and right make it go diagonally

I'm still having trouble with those two problem.. can someone send me a PM and take a look at my full script please? I dont want to give out everything in this thread. These are the last two problems i need to fix before i release and id like to get it out soon.

what am i doing wrong here?:

Code:

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if x = 272 then
x = x + 0
end

if y = 480 then
y = y + 0
end

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if x == 272 then
x = x + 0
end

if y == 480 then
y = y + 0
end

You forgot the second equals sign.

Zitat:

---

Zitat von JaSo PsP

what am i doing wrong here?:

Code:

---

if x = 272 then
x = x + 0
end

if y = 480 then
y = y + 0
end

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do u want it so that if the x hits 480 that it wont go any further?? if so: do this:

Code:

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if x > 480 then
x = 480
end

if y > 272 then
y = 242
end


if x < 0 then
x = 0
end

if y < 0 then
y = 0
end

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This is simpler then adding more if's

Code:

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smiley = Image.load("smiley.png")

x = 0
y = 0

while true do

screen:clear()

screen:blit(x, y, smiley)

if pad:right() and x<272 then
x = x + 1
end

if pad:left()  and x>0then
x = x - 1
end

if pad:down() and x<272 then
y = y + 1
end

if pad:right() and x>0 then
y = y - 1
end

screen.waitVblankStart()
screen:flip()
end

---

Zitat:

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Zitat von Grimfate126

do u want it so that if the x hits 480 that it wont go any further?? if so: do this:

Code:

---

if x > 480 then
x = 480
end

if y > 272 then
y = 242
end


if x < 0 then
x = 0
end

if y < 0 then
y = 0
end

---

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k thanx

theres a problem, i go thru the wall on the right and at the bottom. i found out the answer, i gotta add the dimensions of the smiley face.
-= Double Post =-
Yes! i now have boundries in my first game, now how can i make it detect a collision?

Zitat:

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Zitat von JaSo PsP

k thanxYes! i now have boundries in my first game, now how can i make it detect a collision?

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http://evilmana.com/tutorials/lua_tutorial_12.php

I also wrote a simple collision detection program, bounding boxes.

Search QJ's dev forum for collision.