Lua Programming Help Thread

[thatoneguy559]

alright that's what i thought, thank you for your help

[dan369]

No problem ;)

[sly_spy]

To have it check for a pressed state in HM you do:

oldpad = Controls.read()

--in while loop 
pad = Controls.read() 

if pad:cross() and oldpad:cross() ~= pad:cross() then
    --play sound 
end

--near end of script 
oldpad = pad;
screen.flip() --or flipscreen() depending on your version. 
screen.waitVblankStart()
end

Thank you but maybe you didnt completely understand what i said.
play sound when i am [pressing] a button
and stop when i [release] the button

[SG57]

sly_spy - We tend to ignore dan ;)

Here ya go...

bPlaying = false;

...

while true do
  ...

  pad = Controls.read();

  if pad:cross() then
    if not bPlaying then
      bPlaying = true;

      sound:play();
    end
  else
    if bPlaying then
      bPlaying = false;

      sound:stop();
    end
  end

  ...

end

[dan369]

@sg57 - i'll take that as a joke. It would take very minor adjustment to make my code work, instead of giving it to him on a plate, you should of let him work it out for himself.

[FaT3oYCG]

in retrospect we always used to help you though so i see no harm in helping him, his question was quite a bit different than the code provided seen as he is a new coder

[dan369]

in retrospect we always used to help you though so i see no harm in helping him, his question was quite a bit different than the code provided seen as he is a new coder

What advice did everyone used to always give me? I'm not going to word for word every quote but it went like this:
"Do stuff yourself, you learn more".

I provided a link to the evilmana tut, it explains all about playing sounds, stopping sounds etc.
If he looked through the tuts then he would see usage & explain else, elseif etc.
Now, i know that i'm not one to judge, a year ago i was like him, asking for code, not really looking doing stuff myself. But i regret that, & that stage is well gone. I'm just trying to get the 'do it yourself' habit plugged into his head like many of you did with me.

[SG57]

We are all conspiring against you dan, watch out ;)

[slicer4ever]

We are all conspiring against you dan, watch out ;)

shh!, ur not suppose to tell him!!=-)

[dan369]

ok.....

[sly_spy]

sly_spy - We tend to ignore dan ;)

Here ya go...

bPlaying = false;

...

while true do
  ...

  pad = Controls.read();

  if pad:cross() then
    if not bPlaying then
      bPlaying = true;

      sound:play();
    end
  else
    if bPlaying then
      bPlaying = false;

      sound:stop();
    end
  end

  ...

end

Thank you for leading me to a right way
but the code makes "loop in gettable",so i correct it to:

bPlaying = false;

...

while true do
  ...

  pad = Controls.read();

  if pad:cross() then
    if not bPlaying then
      bPlaying = true;
      music=sound:play();
    end
  elseif music then
      bPlaying = false;
      music:stop();
   end

  ...

end

[sly_spy]

What advice did everyone used to always give me? I'm not going to word for word every quote but it went like this:
"Do stuff yourself, you learn more".

I provided a link to the evilmana tut, it explains all about playing sounds, stopping sounds etc.
If he looked through the tuts then he would see usage & explain else, elseif etc.
Now, i know that i'm not one to judge, a year ago i was like him, asking for code, not really looking doing stuff myself. But i regret that, & that stage is well gone. I'm just trying to get the 'do it yourself' habit plugged into his head like many of you did with me.

Dear Dan,sorry but you didnt know that,firstly,English is not my mother tongue,so i have many difficulties in reading the tutorial;secondly,DIY is a permanent credendum in my mind so that i work out codes of thousands of lines,can you put up with the samall codeblock i've asked for?thirdly,there is No one tells me how to figure it out in my home country,i have no choice but turning to you masters of lua.

[FaT3oYCG]

ok.....

haha, well I always used to help you and you cant say that I didn't, if you do I will cry :Cry:

[dan369]

haha, well I always used to help you and you cant say that I didn't, if you do I will cry :Cry:

but not anymore ;).
@sly - i guess it is hard for you, afaik theres only decent tuts in french & english.
Anyone starting from other countries is at a lose. What country you from btw?

[sly_spy]

@sly - i guess it is hard for you, afaik theres only decent tuts in french & english.
Anyone starting from other countries is at a lose. What country you from btw?

China

[FaT3oYCG]

but not anymore ;).

I know... I gave up on you, lol jk. but yeah mainly because now u usually solve your own problems but you are directly comparable to sly and myself, or anyone else that tries to learn a programming language for that matter.

[hupengwei]

HELP!!!
how to show a picture and make it disappear a few secend later???

[hupengwei]

and how to make the picture move,how to control its speed?

[slicer4ever]

hupengwei, it's called if statements, variables, and logic, learn the basics of programming than come back=-)

[yaustar]

and how to make the picture move,how to control its speed?

Focus on one thing at a time. First step, making an image move with the d-pad. Can you do that?

[yaustar]

Focus on one thing at a time. First step, making an image move with the d-pad. Can you do that?

From hupengwei:

glad to see your reply.i didn't know much basic knowledge,what i did before is just copying different programs together.i think i need learn more, could you recommend some books for lua?
i could move the picture with the d-pad,but i want to make it move without pressing any button.i mean it moves itself.

Starting with the easiest type of movement, let's get the image moving from left to right. Look at the logic you use to make the image move using the d-pad, how would you use the same concept to have the image move without input from the player?

As for books on Lua: Programming in Lua : contents

[hupengwei]

i think i should use a timer and set a proper time,change the position of the picture,
but how to set a timer? SetTimer()???
forgive me for asking so many easy questions.i didn`t know much English and there were not any books on lua in Chinese.
By the way,how to show a picture and make it disappear a few secends later?
Change the value of its alpha??

[yaustar]

i think i should use a timer and set a proper time,change the position of the picture,
but how to set a timer? SetTimer()???

You don't need a timer, all I am asking is for you to simply write some code to move an image from the left of the screen to the right.

forgive me for asking so many easy questions.i didn`t know much English and there were not any books on lua in Chinese.

Oh really?

[sly_spy]

does LP HM has a limit for wav?
as i tried,it can load 700kbps but 1400kbps
Well,how many kbps is its upper limit?

[hupengwei]

yes,this is the code i use to make picure move

x=0
y=100
img= Image.load("Logo.png")
while x<480 do
screen:clear()
screen:blit(x,y,img)
screen.flip
screen:waitVblankstart
x=x+1
end

forgive me for asking so many easy questions.i didn`t know much English and there were not any books on lua in Chinese.

it`s true.i`ve already bought the book 2 weeks ago,the last 70pages are still in english

[hupengwei]

em...as i tried,the upper limit seems to be about 1200

[FaT3oYCG]

you need to set a flag to make the image stop or move left again.

[hupengwei]

you need to set a flag to make the image stop or move left again.

i konw but i don`t konw how to....this is what i am asking for......
Maybe i didn`t express very clear,just because of my poor english

[FaT3oYCG]

local logo = {
x = 0,
y = 100,
img = Image.load("Logo.png"),
directionFlag = 1
}

local function moveLeftRight(_minX, _maxX, _speed, _itemTable)
	if _itemTable.directionFlag == 1 then
		_itemTable.x = _itemTable.x + _speed
		if _itemTable.x > _maxX then
			_itemTable.x = _maxX
			_itemTable.directionFlag = -1
		end
	elseif _itemTable.directionFlag == -1 then
		_itemTable.x = _itemTable.x - _speed
		if _itemTable.x < _minX then
			_itemTable.x = _minX
			_itemTable.directionFlag = 1
		end
	end
end

while true do
	screen:clear()

	moveLeftRight(0, 100, 1, logo)
	screen:blit(logo.x, logo.y, logo.img)

	screen.flip()
	screen.waitVblankstart()
end

?

[hupengwei]

function MovePicture(PathAndFile,MType,speed)
    if MType == 1 then
    logo = Image.load("./Pictures/"..PathAndFile)
	x=-480
	 while x<480 do
	  screen:clear()
	  screen:blit(x,0,logo)
	  screen.flip()
      screen.waitVblankStart()
	  x=x+speed
	 end
	end
	if MType == 2 then
    logo = Image.load("./Pictures/"..PathAndFile)
	x=480
	 while x>-480 do
	  screen:clear()
	  screen:blit(x,0,logo)
	  screen.flip()
      screen.waitVblankStart()
	  x=x-speed
	 end
	end
    if MType == 3 then
    logo = Image.load("./Pictures/"..PathAndFile)
	y=-272
	 while y<272 do
	  screen:clear()
	  screen:blit(0,y,logo)
	  screen.flip()
      screen.waitVblankStart()
	  y=y+speed
	 end
	end
    if MType == 4 then
    logo = Image.load("./Pictures/"..PathAndFile)
	y=272
	 while y>-272 do
	  screen:clear()
	  screen:blit(0,y,logo)
	  screen.flip()
      screen.waitVblankStart()
	  y=y-speed
	 end
	end
end

this is mine.i firmly know how to Move,But i want to {STOP},how to stop is the question .if you can,how to change the alpha value of apicture?i want to fadein and fadeout some pictures
Ps this code moves two fast,and how to slow it down??