Quick questions about Gideros&Lua

oleg · June 2018

I think you need to stopPropagation()

if stage:getChildIndex(sprite)==stage:getNumChildren() then

-- top sprite

keszegh · June 2018

well, i do not want be the sprite 'top' globally, but top at the given screen pixel.

oleg · June 2018

check the cycle whether there is someone above

for i = #stage:getNumChildren, 1, -1 do

if stage:getChildAt(i):hitTestPoint(x,y) then
print ("bingo")
break
end
end

keszegh · June 2018

@oleg, thanks,
your idea should work, although i think there needs to be a recursive call to make it work properly. i think i could indeed do it this way, so the question is if there is some built-in/faster/simpler solution.

Apollo14 · June 2018

Guys, should we always call GTween as local?

function pulsePlayerScale()
	local makePlayerSmaller=GTween.new(player, .2, {scaleX=0.4,scaleY=0.4}, {delay = 0, ease = easing.linear})
end

Or calls like that do not affect perfomance and are normally garbage collected after tween ended?

function pulsePlayerScale()
	GTween.new(player, .2, {scaleX=0.4,scaleY=0.4}, {delay = 0, ease = easing.linear})
end

Apollo14 · June 2018

Guys, how do we setup realtime multiplayer in 2018?
I've checked some old forum posts, there are mentionings of noobhub, google play services, appwarp, etc. What to choose if I want to setup basic multiplayer shooter? Thx!
p.s. @totebo what do you use for NoBrakes.io?

oleg · June 2018

@Apollo14
ти цей приклад бачив??

http://giderosmobile.com/forum/discussion/comment/28861/#Comment_28861

SinisterSoft · June 2018

Here is Unite working in my football game prototype:

oleg · June 2018

@SinisterSoft Is this a convenient menu?

Apollo14 · June 2018

Gideros Unite connects user-to-user without server?

Isn't server mandatory for reliable global multiplayer?

SinisterSoft · June 2018

@oleg I'm not quite sure what you mean...

Do you mean the menu location? The menu is at the bottom left, but I might move it - it's just a prototype soccer game.

@Apollo14 One of the devices is a server and other(s) are a client. The client sends control data back to the server and it sends out changes, etc it all works asynchronously. You have to beware of disconnecting servers, clients and the possibility of out of order or missing packets (if you use upd). There can be multiple clients - or in fact multiple servers if you like.

oleg · June 2018

@Apollo14 у юніті є свої платні ігрові сервера і там гарна документація - подивись, або можна дешевий варіант зробити свій хост з БД для реєстрації адрес пристроїв до якої гра буде підключатись і записувати адресу гравця-сервера а бо читати її

Apollo14 · June 2018

Guys, can you help me to understand how to use math.sin in games?
How to make sprite simply float up and down using math.sin?

oleg · June 2018

в enterframe ставиш sprite:setY(scale*sin(t*speed))

але для прижків краще використовувати таку формулу :

playerY += jumpSpeed
jumpspeed -= gravityPower

Apollo14 · June 2018

oleg said:
в enterframe ставиш sprite:setY(scale*sin(t*speed))

How to make it work? (increase amplitude)
It doesn't work for me:

local t,speed=50,1
stage:addEventListener(Event.ENTER_FRAME, function()
	floatingPic:setY(math.sin(t*speed))
	t+=.01
end)

I've experimented with timer instead of enterframe t+=.01, didn't get desired result

newTimer = Timer.new(100,0)
newTimer:addEventListener(Event.TIMER, function()
	t+=100
end)
newTimer:start()

oleg · June 2018

типу так
local t,speed=1,1
stage:addEventListener(Event.ENTER_FRAME, function()
t=t+1
floatingPic:setY(math.sin(t*speed))
end)

http://giderosmobile.com/forum/discussion/4768/sine-waves/p1

Apollo14 · June 2018

@oleg it doesn't work at all, it shakes, but no magnitude:

local t,speed=1,1
floatingStone:addEventListener(Event.ENTER_FRAME, function()
	t+=1
	floatingStone:setY(math.sin(t*speed))
end)

Apollo14 · June 2018

uh, example from this topic actually works: http://giderosmobile.com/forum/discussion/4768/sine-waves/p1
I'll play with its values in the morning. Thanks @oleg !

oleg · June 2018

я перевірив цей код у мене працює

local kartinka = Bitmap.new(Texture.new("img/brick_tiles_v2_01.png"))
 
kartinka:setX(200)
kartinka:setY(400)
 
stage:addChild(kartinka)
 
 
 
 
 
 
 local speed,scale=1,10
kartinka:addEventListener(Event.ENTER_FRAME, function(e)
 
	kartinka:setY(scale*math.sin(e.time*speed))
end)

Apollo14 · June 2018

@SinisterSoft @hgy29 I've found Lua optimization tips, where corona's developers strongly recommend a practice called "Disposing Audio".

Remember, you must dispose of audio files when they're no longer needed and clear any references to them. Assuming the table structure above is used to organize and preload sounds, the following loop will dispose of the audio handles:

for s = #soundTable,1,-1 do
    audio.dispose( soundTable[s] ) ; soundTable[s] = nil
end

Do we need to "dispose audio" in Gideros somehow? Isn't it disposed after we make 'soundTable=nil'?

oleg · June 2018

local gametune = Sound.new("DST-AngryMod.mp3")
gametune:play(0, true)
gametune = nil
collectgarbage()

Apollo14 · June 2018

oleg said:
local gametune = Sound.new("DST-AngryMod.mp3")
gametune:play(0, true)
gametune = nil
collectgarbage()

Why corona guys use 'audio.dispose' instead of standard Lua's 'collectgarbage'?

SinisterSoft · June 2018

Different API.

totebo · June 2018

Apollo14 said:

p.s. @totebo what do you use for NoBrakes.io?

I use Liten, a custom backend built by with Go.

Apollo14 · June 2018

Guys how would you make changable event system in game?
For example on July 4th we want to make x2 score bonus, on Christmas 50% discount for in-app purchases, etc. (and we'll need to add new unknown events later on)

First thought that comes to me is to do it via UrlLoader, keeping .txt and .jpg files somewhere on my host, with consistent url.
It's very primitive, I'm not sure if it's a good solution. There're some gaming database services, I'm not familiar with them yet. Do they provide better solution?

hgy29 · June 2018

I think that would be a job for Firebase remote configs

oleg · July 2018

Sound:getLength - does not work??

hgy29 · July 2018

Doesn’t work for ogg as far as I know, but should work for other formats

oleg · July 2018

"
Uploading finished.
snd/fon3.ogg: Sound format is not supported.
stack traceback:"

the windows -ogg works on the player, android does not work ??

--------------------------
I realized that you need to enable the plugin
http://giderosmobile.com/forum/discussion/7129/ogg-music-playback

hgy29 · July 2018

getLength and seeking will be implmented for ogg in next release: https://github.com/gideros/gideros/commit/3b43456c1745b543253ceb518fb998ec0020d8c9

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