Lua Programming Help Thread

[psporpcp]

how would i go about stopping the timer on a specific time? (5 Min. or 10Min.)

Sorry for all the questions ^^

TIMER:
screen:clear()
System.usbDiskModeActivate()

red = Color.new(255, 0, 0)
grey = Color.new(94, 97, 111)

screen:print(13, 5, "Press L-Trigger to ARM BOMB and R-Trigger to DISARM BOMB.", grey)
screen:flip()

Timer = Timer.new(0)

while true do
	screen.waitVblankStart(5)
	pad = Controls.read()
	if pad:l() then
		Timer:reset()
		Timer:start()
		while true do
			pad = Controls.read()
			screen:clear()
			screen:print(13, 5, "Press L-Trigger to ARM BOMB and R-Trigger to DISARM BOMB.", grey)
			screen:print(220, 133, tostring(math.floor(Timer:time()/1000/60) .. ":" .. math.floor((Timer:time()/1000/60-math.floor(Timer:time()/1000/60))*60) .. ":" .. string.sub(tostring(math.floor(Timer:time()/10)), -2)), red)
			screen:flip()
			if pad:r() then
				Timer:stop()
				break
			end
		end
	elseif pad:start() then dofile("script.lua")
	end
end

[Nielkie]

See http://wiki.ps2dev.org/psp:lua_playe...lisecond_timer

Timer:time()

[dan369]

Is there a way to draw a Square grid to the screen using lua(NO IMAGES)??

[SG57]

dan - is there a drawLine function in Lua?

SQUARE_SIZE = 10 -- how many pixels per grid square
GRID_WIDTH = 10  -- how many squares across
GRID_HEIGHT = 10 -- how many squares down
GRID_COLOR = Color.new(0,255,0) -- color of the grid lines
GRID_OFFSET_X = 240 - SQUARE_SIZE * GRID_WIDTH / 2 -- offset the grid on the X axis by this many pixels
GRID_OFFSET_Y = 136 - SQUARE_SIZE * GRID_HEIGHT / 2 -- "      "    "   "  "  Y  "    "   "   "     "

function drawGrid(target)
  for y = 0, GRID_HEIGHT do
    for x = 0, GRID_WIDTH do
      -- draws lines from the top of the grid to the bottom going across
      target:drawLine(x * SQUARE_SIZE + GRID_OFFSET_X, GRID_OFFSET_Y,
                      x * SQUARE_SIZE + GRID_OFFSET_X, SQUARE_SIZE * GRID_HEIGHT + GRID_OFFSET_Y, GRID_COLOR)
      -- draws lines from the left of the grid to the right going down
      target:drawLine(GRID_OFFSET_X, y * SQUARE_SIZE + GRID_OFFSET_Y,
                      SQUARE_SIZE * GRID_WIDTH + GRID_OFFSET_X, y * SQUARE_SIZE + GRID_OFFSET_Y, GRID_COLOR)
    end
  end
end

drawGrid(screen)

screen.flip()

while not Controls.read():cross() do
end

With those parameters set that'll draw a green 10x10 grid in the center of the screen with each grid square being 10x10 as well. Modular programming ftw...

[Nielkie]

Pff, beaten.

WIDTH = 10
HEIGHT = 10
SPACING = 10

white = Color.new(255, 255, 255)

for i = 0, WIDTH do
	screen:drawLine(i * SPACING, 0, i * SPACING, HEIGHT * SPACING, white)
end
for i = 0, HEGIHT do
	screen:drawLine(0, i * SPACING, WIDTH * SPACING, i * SPACING, white)
end

[dan369]

Thanks, damn forgot about drawLine.

[FaT3oYCG]

i suggest drawing the lines to one singular Image.createEmpty() and then blitting that image to the screen it might speed it up slightly, rather than doing as show in the examples 20 loops and draw lines each time you go through the main while loop

from what i understand you meant no image files.

[TurtlesPwn]

i suggest drawing the lines to one singular Image.createEmpty() and then blitting that image to the screen it might speed it up slightly, rather than doing as show in the examples 20 loops and draw lines each time you go through the main while loop

from what i understand you meant no image files.

Drawline is slow but not nearly as slow as blitting images. As long as its not like the whole screen and can be incorporated into another image thats there anyways, drawLineing each loop is much faster

[Digikid13]

I was wondering if this would work

if pad:up() then
    Adhoc:send(up)
end

pad = Adhoc:recv()
if pad == up then
    Player.img = Player.img + speed
end

[basfreak]

i think u should send a string like "padButtonUp"
and if the received is that string do code.

[dan369]

Yeah, i did mean no images.So bliting images is slow?I knew it took up memory but slow?Blitting an image always seemed pretty fast to me.

[TurtlesPwn]

You've OBVIOUSLY never made a CPU-intensive game.

[FaT3oYCG]

Drawline is slow but not nearly as slow as blitting images. As long as its not like the whole screen and can be incorporated into another image thats there anyways, drawLineing each loop is much faster

my bad, i do that when i am displaying lots of images, i blit them to one image and then i dont have to blit every image every loop, i didnt realise that drawline is done differently or that it was faster.

[TurtlesPwn]

For images, yes, one is faster than lots, but drawline is just....
a line.....

a line != an image

[_dysfunctional]

My assumption is that whatever drawline function you are using modifies the the pixels manually, using a line algorithm. If you have access to the GU, which you do, you are better off writing your own function that uses GU_LINES.

[TurtlesPwn]

Yes and that is certainly MUCH faster but you're forgetting that this person needed help making a grid and thus the GU would be a bit out of his current level.....

[_dysfunctional]

Regardless, he should know there is a faster way so when he gains the experience, he can do it the right way.

[michaelp]

Someone should just make a draw line function using the GU anyways so that drawing lines will be so much faster!

[TurtlesPwn]

Except there are a lot of different ways you would want to do it for different uses and a generic function would have to account for all of that and thus be rather slow in comparison to other unique uses

[SG57]

Well, I suppose you could take my drawGrid function and convert it to use fillRect since the 'lines' are at pi/2, pi, 2/3*pi, 2pi and can be represented by a rectangle easily, plus it'd be faster then a drawLine...

fillScreenRect

void fillScreenRect(Color color, int x0, int y0, int width, int height)
{
	if (!initialized) return;
	int skipX = PSP_LINE_SIZE - width;
	int x, y;
	Color* data = getVramDrawBuffer() + x0 + y0 * PSP_LINE_SIZE;
	for (y = 0; y < height; y++, data += skipX) {
		for (x = 0; x < width; x++, data++) *data = color;
	}
}

drawLine:

static void drawLine(int x0, int y0, int x1, int y1, int color, Color* destination, int width)
{
	int dy = y1 - y0;
	int dx = x1 - x0;
	int stepx, stepy;
	
	if (dy < 0) { dy = -dy;  stepy = -width; } else { stepy = width; }
	if (dx < 0) { dx = -dx;  stepx = -1; } else { stepx = 1; }
	dy <<= 1;
	dx <<= 1;
	
	y0 *= width;
	y1 *= width;
	destination[x0+y0] = color;
	if (dx > dy) {
		int fraction = dy - (dx >> 1);
		while (x0 != x1) {
			if (fraction >= 0) {
				y0 += stepy;
				fraction -= dx;
			}
			x0 += stepx;
			fraction += dy;
			destination[x0+y0] = color;
		}
	} else {
		int fraction = dx - (dy >> 1);
		while (y0 != y1) {
			if (fraction >= 0) {
				x0 += stepx;
				fraction -= dy;
			}
			y0 += stepy;
			fraction += dx;
			destination[x0+y0] = color;
		}
	}
}

[seanpaul223]

Got a Little trouble when using Yourseam's Netlib Library.
Its returns: error index lua (Line 52) : Bind Error

here is the 52th Line:

serverSocket = Socket.createServerSocket(17852)

and the whole code:

selec = 1

noms = "serveur 1"

blanc = Color.new(255,255,255)
noir = Color.new(0,0,0)

ip = Wlan.getIP()

fleche = Image.load("images/epee.png") 
fd = Image.load("images/co.png") 

fi = io.open("nom.txt" , "r")   
fdc = fi:read("*n") 
fi:close() 

oldpad = Controls.read() 

while true do
screen:clear()
pad = Controls.read() 

screen:blit(0,0,fd) 


dofile("netlib.lua")
netlib_server = "66.25.53.65"
netconnect()

if selec == 0 then
selec = 1
end

if selec == 3 then
selec = 2
end

if selec == 1 then
screen:blit(40,60,fleche) 
end
if selec == 2 then
screen:blit(162,181,fleche) 
end

if pad:down() and oldpad:down() ~= pad:down() then
selec = selec + 1
end
if pad:up() and oldpad:up() ~= pad:up() then
selec = selec - 1
end

serverSocket = Socket.createServerSocket(17852) --Here is the Line of error 

if pad:cross() and oldpad:cross() ~= pad:cross() and selec == 1 then
Socket.connect(netlib_server, 17852)
if Socket:isConnected() == "true" then
dofile("carte1-1.lua")
end
end

if pad:cross() and oldpad:cross() ~= pad:cross() and selec == 2 then
System.message("Voulez-vous quitter le jeu ?", 1)
Bouton = System.buttonPressed(1)
if Bouton == "Yes" then
   System.Quit()
end
end

screen:print(400,0,ip,blanc)
screen:print(85,77,noms,noir)
screen.flip()
screen.waitVblankStart()
oldpad = pad
end

[TurtlesPwn]

while true do
screen:clear()
pad = Controls.read() 

screen:blit(0,0,fd) 


dofile("netlib.lua")
netlib_server = "66.25.53.65"
netconnect()

You're loading netlib and then starting the connection every single loop. Those last three lines belong BEFORE your main loop.
And then why are you creating a server socket in the first place for using netlib? No need to......

Also, you should indent your code and it would be a lot easier to read.

[Digikid13]

How do you get luaplayer to check the music folder for an mp3 and play all of them one after another.

[TurtlesPwn]

Open the folder with listDirectory, loop through the list and play it if its a .mp3

[_dysfunctional]

Usually, raping LuaPlayer with a large metal pipe will get it to do whatever you want. Just make sure it knows who its daddy is.

[Digikid13]

Can you post a code example thanks.

[TurtlesPwn]

Can you post a code example thanks.

I made it as simple as it gets.
Open the directory and get a listing with System.listDirectory
Loop through the items with a for loop
Play each one

What more is there to it? Asking for code indicates incompetence and a copynpasting noob. Try to do it yourself and ask for help on EXACTLY what you can't figure out.

[PSProgramer]

Usually, raping LuaPlayer with a large metal pipe will get it to do whatever you want. Just make sure it knows who its daddy is.

hahahahahaha lol thats halarious

[_dysfunctional]

On a serious note, I was looking through the docs, and found this function:

System.PlayAllMp3sInASpecificDirectoryOneAfterTheOther(dirname)

You should try that.

[PSProgramer]

lol