Printable View
does anyone know how the paint bucket tool works? i could easily create a tool that fills a pixel, then checks its neighbors, and for each neighbor, repeat. but that would be extremely slow and memory consuming. it was done in yPaint by yongobongo, but he locked the script.
Hi guys, there is something that i havent understood yet...
what does that mean: analogX/Y -ranges from -127 to 128
what does that mean? I dont understand it? Why does it actually range from -127 to 128? Whats that good for? I need to understand...
Just to Translate and further explain my understanding of this, Luaplayer considers your center point (the point at which the object is rotated) to be 0,0,0 . So when you build your object, be sure that you are making 0,0,0 your pivot point. Then no matter where to translate your object to, it will rotate at the center of your object. I mistook the original suggestion as to meaning that I could create my object, translate it to 0,0,0 (after the fact) and then it would rotate correctly, but it didn't quite work like that as I found out. Thanks again for the help.Zitat:
Zitat von KleptoOne
-= Double Post =-
Its to determine how far to the left, right, up, down the stick is moved. This gives you the freedom to program pressure sensitivity into whatever app you're developing.Zitat:
Zitat von bumuckl
ah ok thx a lot...another thing: I dont know to make that real: If u move the dpad left on the x-axis, a picture should move right. Moving the picture aint so hard xD...the problem is, how can i tell my PSP that this should happen when i move dpad left...my code looks like this:
pad = Controls.read()
dx = pad:analogX()
if math.abs(dx) > 32 then
x0 = x0 + dx / sens
end
dy = pad:analogY()
if math.abs(dy) > 32 then
y0 = y0 + dy / sens
end
sens is a variable...soo dont worry, thats not the problem.
so here is the picuter that should be moved right:
screen:blit(box, boy, bg, 0, 0, bg:width(), bg:height(), false)
box and boy are both varibles, in this case, box should increase while holding dpad left...
As the d-pad can't be pressure sensitive (not without a hardware manipulation) just have
dpad left: x0 = x0 - sens
dpad right: x0 = x0 + sens
dpad up: y0 = y0 - sens
dpad down: y0 = y0 + sens
Change the value of sens should you not want it to move full speed as if the analog were all the way pushed one direction.
You mean the stick and I can't beleive this code is popping up again, I've explained a million times why this code is flawed... and here it goes again... math.abs() returns the absolute value of a number, meaning if its supposed to be -5, it will return 5, which means it will never go the other way because the number can never be negative... If you want to move something in some direction...Zitat:
Zitat von bumuckl
Code:pad = Controls.read()
if pad:analogX() > 30 then
{move a direction}
end
if pad:analogX() < -30 then
{move the other direction}
end
....same idea for analogY()...
Klepto, you're missing something here:
This code is using the converted analog position only to check if the analog stick has been moved oustide the dead zone, the player movement formula here is using the original signed value of the analog to calculate the new coordinates, which will provide the correct movement. This setup lets you use one value comparison to see if the analog stick has been moved, compared with the two that would be needed without using math.absCode:if math.abs(dy) > 32 then
y0 = y0 + dy / sens
Just a small note that this is not just limited to Lua Player, it's a generic 3D thing.Zitat:
Zitat von KleptoOne
oh I see, using the real value of dy as your movement speed and sens to limit the amount. Thats actually clever... my sneakers taste like rubber if anyone is wondering;-)Zitat:
Zitat von Merick
Guys i still dont get it working...the code is :
dx = pad:analogX()
if math.abs(dx) > 32 then
x0 = x0 + dx / sens
box = box - 1
end
if math.abs(dx) < -32 then
x0 = x0 - dx / sens
box = box + 1
end
dy = pad:analogY()
if math.abs(dy) > 32 then
y0 = y0 + dy / sens
end
if math.abs(dy) < -32 then
y0 = y0 - dy / sens
end
The Problem is, when i press Dpad right, the image goes left, thats ok. But when i press Dpad-left, nothing happens, no it continues turnign right while pressing Dpad left...what is worng with it?
bumuckl:
math.abs returns absolute value from number, means:
so therefore this part:Zitat:
math.abs(-32) = 32
math.abs(32) = 32
will NEVER happenZitat:
if math.abs(dx) < -32 then
this works for me:
Code:pad = Controls.read()
anaX = pad:analogX()
anaY = pad:analogY()
if anaX > 30 then
Player.x = Player.x + (math.abs(pad:analogX())/ana)
end
if anaX < -30 then
Player.x = Player.x - (math.abs(pad:analogX())/ana)
end
if anaY > 30 then
Player.y = Player.y + (math.abs(pad:analogY())/ana)
end
if anaY < -30 then
Player.y = Player.y - (math.abs(pad:analogY())/ana)
end
Thy very nice now ive understood...thy very much...ur going to be in the Credits...
if anyone missed me,
im still hereZitat:
Zitat von Da_MerV
Zitat:
Zitat von myschoo
.....my head hurts. Jump back a page to see why the code does work, I made the same mistake at a quick glance, but the previous method is actually better because it doesn't negate the sensitivity of the stick AND it only makes one logic check.Zitat:
Zitat von bumuckl
what is this "paint bucket" tool you speak of da_merv?
you know, click and it fills it with your color, its a basic tool of paint
lua player doesn't have one, you'll have to write it yourself
ya i know luaplayer doesnt have one. i didnt ask that. i asked how the fill bucket works, i mean, it was done in yPaint, which was written in lua, but yongobongo compiled the script, and i dont have a decompiler, so theres no way i can find out how he did it unless he wants to tell me.
-= Double Post =-
oh, and in the last couple days of research (aka google 24/7), i found the proper name. its called flood fill
-= Double Post =-
oh and even more information, after actually looking at yongobongo's program, i found out the flood fill was implemented horribly, crashes frequently, and doesnt even work all the time.
I am trying to handle an Image.load() error but it's not working :(
Is there a different way i should do this?
Code:if not Image.load("test.png") then
screen:print(0,0,"error loading image")
else
test = Image.load("test.png")
screen:blit(0,0,test)
end
shouldnt 'test = Image.load("test.png") come before luaplayer checks if its there?Zitat:
Zitat von Yongobongo
i dont know, maybe:
thats my guess.Code:test = Image.load("test.png")
if not Image.load("test.png") then
screen:print(0,0,"error loading image")
else
screen:blit(0, 0, test)
end
-= Double Post =-
didnt you say you already know how to do it? just improve on it.Zitat:
Zitat von Da_MerV
-= Double Post =-
yongobongo, tacticalpenguin says:
Zitat:
Zitat von TacticalPenguin on msn
Ok thanks i will try this - but this only checks if the file exists, right? I'm trying to make sure that the image can actually be used (ie. PNG's over 512x512)
i never did this before, but looking at this list, i'd say this is how to do it:Zitat:
Zitat von Yongobongo
please correct if i am wrong thoughCode:test = Image.load("test.png")
testX = test.width()
testY = test.height()
if testX*testY >= 512*512 then
[blah blah]
end
if the image can't be loaded then using Image.load on it will cause the script to break and show the error message, but from what I understand what Yongo wants to do is check to see if an image can be loaded in order to avoid having Image.load break the script
There are two ways that I can see for doing this. The first would be to do research on the format of the .png header and write a function that could open it as a data file to read the image dimensions and other stuff from the header. The second would be to get into the lua player source and either add a new function to check if the image can be loaded, or else change the Image.load function to prevent it from throwing the error
O.k. I've put the code to recall the random numbers after the correct/incorrect message is shown. Now there is a random bug where I only press the button once, but I get about 2-5 incorrect/correct messages. E.G. I could press left once but the screen shows correct then correct then incorrect then correct again.
PS The code is the same except after scren.flip() i've added RanNumber = math.random(1,11)
PPS If anyone doesn't know what code i'm talking about go to page 784. It isn't hard to find. ;)
Your problem is that the button is being pressed for more than one loop. You could use timers, and pause it after a question, or you could use this:
Code:oldpad = Controls.read()
while true do
pad = Controls.read()
if (pad:left() ~= oldpad:left()) and pad:left() then
bla bla bla
end
oldpad = pad
end
P.S. Can anyone point me to a non-pixel based, circle-rectangle collision algorithm that works with a diagonal rectangle? It would save me some time.
I've tried putting in what you suggested but it doesn't make a difference.Zitat:
Zitat von Nielkie
[EDIT]
I've decided to remake the game from scratch. I've keep getting bug after bug after bug and it's completely useless.
[EDIT]
I've redone the code. I now have an error saying bad argument #1 to 'len' (string expected, got nil). Any ideas how to fix this?
Code:math.randomseed(os.time());
NUM_QUESTIONS = 12
NUM_ANSWERS = 12
question = {}
question[1] = { name = "What countries did Vikings originate from?", answer = {"A: Germany, England and Iceland","B: Greenland, Germany and Iceland","C: Denmark, Sweden and Norway","D: Iceland, Sweden, Norway"}, correctAnswer = 3 }
question[2] = { name = "Why did the Vikings originally travel to other countries?", answer = {"A: To trade","B: To plunder","C: To kill","D: To sieze power"}, correctAnswer = 1 }
question[3] = { name = "Vikings had a reputation for being what in battle?", answer = {"A: Couragous","B: Random","C: Strong","D: Skilled"}, correctAnswer = 4 }
question[4] = { name = "What weapons were used by the Vikings?", answer = {"A: Bows, Rifles and Swords","B: Sword, Double-Axe and Spear","C: Cannons, Arrows and Bows","D: Sword, Arrows and Canons"}, correctAnswer = 2 }
question[5] = { name = "What was the common name of the plague in medieval Europe?", answer = {"A: Black Plague","B: Dark Plague","C: Black Death","D: Bubonic Death"}, correctAnswer = 3 }
question[6] = { name = "How long did the Hundred Years' War last?", answer = {"A: 100","B: 116","C: 84","D: 136"}, correctAnswer = 2 }
question[7] = { name = "What spread the Bubonic Plague?", answer = {"A: Rats","B: Ticks","C: Fleas","D: Beavers"}, correctAnswer = 3 }
question[8] = { name = "What objects were Vikings buried in?", answer = {"A: Their Ships","B: Graves","C: Crypts","D: Their Homes"}, correctAnswer = 1 }
question[9] = { name = "What was another name for Vikings", answer = {"A: Plunderers","B: Norsemen","C: Wolfmen","D: They didn't have other names"}, correctAnswer = 2 }
question[10] = { name = "What countries did Vikings originate from?", answer = {"A: Denmark, Sweden and Norway","B: Greenland, Iceland and Norway","C: Iceland, Germany and Norway","D: Germany, England and Iceland"}, correctAnswer = 1 }
question[11] = { name = "Knights fought on what?", answer = {"A: Slaves","B: Cows","C: Horses","D: Their Feet"}, correctAnswer = 3 }
question[12] = { name = "What 4 empires existed prior to the Dark Ages?", answer = {"A: Roman, Persian, English and American","B: Roman, Guptan, Persian and Barbarian","C: Japanese, Chinese, Guptan and Roman","D: Roman, Guptan, Persian and Chinese"}, correctAnswer = 4 }
function printCentered(y,text,color)
local length = string.len(text)
local x = 240 - ((length*8)/2)
screen:print(x,y,text,color)
end
currentQuestion = math.random(1, NUM_QUESTIONS)
correct = 0
incorrect = 0
oldQuestion = 0
oldpad = Controls.read()
while true do
pad = Controls.read()
if oldpad ~= pad then
if pad:left() then
if question[currentQuestion].correctAnswer == 1 then
correct = correct + 1
else
incorrect = incorrect + 1
end
oldQuestion = currentQuestion
while currentQuestion == oldQuestion do
currentQuestion = math.random(1,12)
end
elseif pad:right() then
if question[currentQuestion].correctAnswer == 2 then
correct = correct + 1
else
incorrect = incorrect + 1
end
oldQuestion = currentQuestion
while currentQuestion == oldQuestion do
currentQuestion = math.random(1,12)
end
elseif pad:square() then
if question[currentQuestion].correctAnswer == 3 then
correct = correct + 1
else
incorrect = incorrect + 1
end
oldQuestion = currentQuestion
while currentQuestion == oldQuestion do
currentQuestion = math.random(1,12)
end
elseif pad:circle() then
if question[currentQuestion].correctAnswer == 4 then
correct = correct + 1
else
incorrect = incorrect + 1
end
oldQuestion = currentQuestion
while currentQuestion == oldQuestion do
currentQuestion = math.random(1,12)
end
end
end
oldpad = pad
screen:clear()
if correct + incorrect == 50 then
break
end
printCentered(140,question[currentQuestion].name, Color.new(255,255,255))
for i=1,NUM_ANSWERS do
printCentered(160 + i*15,question[currentQuestion].answer[i], Color.new(200,200,200))
end
printCentered(10,"Correct: " .. correct .. " Incorrect: " .. incorrect, Color.new(255,255,255))
screen.waitVblankStart()
screen.flip()
end
I made lua program, now I want to know How I can make EBOOT from my lua program. It isn't very funny to start lua player every time, before starts my program.
I am sorry for my bad english.
To compile an eboot you need cygwin (linux emulator for windows) and psptoolchain. However, because you used Lua as a programming language, you can't compile it into an eboot file.Zitat:
Zitat von ISO-B
@drag_93: NUM_ANSWERS should be 4.
P.S. Save some space:
@ISO-B: See http://www.forums.evilmana.com/index.php?topic=861.0Code:if oldpad ~= pad then
if pad:left() then
answer = 1
elseif pad:right() then
answer = 2
elseif pad:square() then
answer = 3
elseif pad:circle() then
answer = 4
end
end
if question[currentQuestion].correctAnswer == answer then
correct = correct + 1
oldQuestion = currentQuestion
while currentQuestion == oldQuestion do
currentQuestion = math.random(1,12)
end
answer = 0
elseif answer ~= 0 then
incorrect = incorrect + 1
oldQuestion = currentQuestion
while currentQuestion == oldQuestion do
currentQuestion = math.random(1,12)
end
answer = 0
end
You can make an EBOOT file that runs LUA scripts. Not sure how though.Zitat:
Zitat von drag_93
Theres a few ways. If you know C, you can program a 'lua player' that has converted all of the lua scrip to Lua commands within the app so it's completely unknown as you'd have to reverse engineer the EBOOT. the other method is embedding the Lua script iwthin the eboot which has been done but is still readable via opening the EBOOT. Not sure what oyu want to compile it for however.
but then again, if you have no clue what you are doing really, you could do this (the easiest method i believe there is):
delete applications folder and everything in it. go to system, delete library folder. copy and paste everything from your game in the main luaplayer folder. rename the folders to whatever you want "name" and "name%" and there you go. :)
theres an app that allows you to modify the eboot, but i dont know it. :( as long as the eboot remains like it is, it'll come up as 'luaplayer' in the xmb but it will actually be your creation.
yes eminent is right, thats the easiest way. what you need to change what the eboot says and looks like is PSPBrew i think, i will check real quick and then send a link here
-= Double Post =-
okay it is, here is the link
I have a problem with my menu.
Basically i have an image with three options on it, and i have an image for an arrow to display which one is highlighted.
I can and have the code for just the arrow to move between each option by pressing up/down, but i want to go a bit more advanced. i want the arrow to move slightly from side to side like
in first half second
->
2nd:
. ->
3rd
... -> [ignoring the full stops]
and back then and repeat that.
so i made a nother integer , arrow1 (one signifying that it's highlighting the 1st option) and thin int can be 1,2 or 3 which displays it moving.
Only problem is it doesnt work, the menu gets glitchy and gets linely in places
I've only tried it for the first option, i hope to have arrow2 and 3 ints if i can get the 1st one to workPHP-Code:
oldpad = Controls.read()
screen:clear()
menu = Image.load("menu.png")
arrow = Image.load("arrow.jpg")
intmenu = 1
while true do
pad = Controls.read()
if pad:down() and oldpad:down() ~= pad:down() then
intmenu = intmenu + 1
end
if pad:up() and oldpad:up() ~= pad:up() then
intmenu = intmenu - 1
end
if intmenu >= 4 then
intmenu = 1
end
if intmenu <= 0 then
intmenu = 3
end
if intmenu == 1 then
arrow1 = 1
screen.waitVblankStart(3)
arrow1 = arrow1 + 1
if arrow1 >= 4 then
arrow1 = 1
end
if arrow1 <= 0 then
arrow1 = 3
end
if arrow1 == 1 then
screen:clear()
screen:blit(0, 0, menu)
screen:blit(3, 105, arrow)
end
if arrow1 == 2 then
screen:clear()
screen:blit(2, 105, arrow)
end
if arrow1 == 3 then
screen:clear()
screen:blit(1, 105, arrow)
end
screen:flip()
if pad:cross() then
dofile("character.lua")
end
end
if intmenu == 2 then
screen:clear()
screen:blit(0, 0, menu)
screen:blit(3, 172, arrow)
if pad:cross() then
dofile("credits.lua")
end
end
if intmenu == 3 then
screen:clear()
screen:blit(0, 0, menu)
screen:blit(3, 240, arrow)
if pad:cross() then
dofile("credits.lua")
end
end
screen:flip()
oldpad = pad
end
I have a feeling that i have a blit in the wrong places but tried different ways and didnt work properly
Anyone see a problem(s)??
i havent really looked too much into the code, but try defining arrow1 outside all if statements. (and loops.) instead of in a while statement, like it is now.
Way to many screen:clear() calls, only use one right at the start of your loop and just make sure you build your screen image in the correct order. also you shouldn't have to make new variables for the cursor movement... use the same one. Try to find the algorithms in everything you do, keeps your code a lot cleaner and easier to debug. For instanceZitat:
Zitat von DtotheK
anyways, you get the jist (written out of memory so I appologize for any slight syntax errors). If you keep it all in tables it makes it alot easier to unload when switching between game modes to free up memory.Code:
menu = {}
menu.selection = 1
menu.max = 3
menu.rowHeight = 70
menu.cursor = image.load(<IMAGE>)
menu.cursorSwayMax = 5
menu.cursorSway = 0
while true do
screen:clear()
pad = Controls.read()
if pad:up() then
menu.selection = menu.selection - 1
if menu.selection <= 0 then
menu.selection = menu.max
end if
end if
if pad:down() then
menu.selection = menu.selection + 1
if menu.selection > menu.max then
menu.selection = 1
end if
end if
if menu.cursorSwayMax > 0 then
menu.cursorSway = menu.cursorSway + 1
else
menu.cursorSway = menu.cursorSway - 1
end if
if menu.cursorSway == menu.cursorSwayMax then
menu.cursorSwayMax = menu.cursorSwayMax * -1
end if
screen:blit(10 - menu.cursorSway, menu.rowHeight*menu.selection, menu.cursor)
screen.flip()
end
yes! works and looks great! just a few lines needed slight changing, and i'll change the control detection thing cause when you hold down/up down it flys through the options like mad. and i'll stick in the actual backround of the menu.
Thankyou !!!
i'll post up the code when i fix it up incase anyone wants it.
-= Double Post =-
here it is, works perfectly!
just have to match up the heights of option and arrow
and what to do when menu.selection = 1,2 and 3!
:Punk:PHP-Code:oldpad = Controls.read()
menu = {}
menu.selection = 1
menu.max = 3
menu.rowHeight = 70
menu.cursor = Image.load("arrow.jpg")
menu.back = Image.load("menu.png")
menu.cursorSwayMax = 5
menu.cursorSway = 0
while true do
screen:clear()
while true do
pad = Controls.read()
if pad:up() and oldpad:up() ~= pad:up() then
menu.selection = menu.selection - 1
end
if menu.selection <= 0 then
menu.selection = menu.max
end
if pad:down() and oldpad:down() ~= pad:down() then
menu.selection = menu.selection + 1
end
if menu.selection > menu.max then
menu.selection = 1
end
if menu.cursorSwayMax > 0 then
menu.cursorSway = menu.cursorSway + 1
else
menu.cursorSway = menu.cursorSway - 1
end
if menu.cursorSway == menu.cursorSwayMax then
menu.cursorSwayMax = menu.cursorSwayMax * -1
end
screen:blit(0, 0, menu.back)
screen:blit(10 - menu.cursorSway, menu.rowHeight*menu.selection, menu.cursor)
screen.flip()
oldpad = pad
end
end
does anyone know if there is a do-while loop in lua? if so how would you construct it. i have been looking and couldn't find it so i figured i'd ask here.
Zitat:
Zitat von emericaska8r
Learn basic lua syntax here:Code:repeat
<code>
until condition
Program in Lua
DtotheK:
whats the real point of this:
while true do
screen:clear()
while true do
pad = Controls.read()
??????????????????? o_O