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SPDApps

is it possible to have a screen shake effect in gideros?

glennbjr

Yup. You could do something like this.


local function shakeScreen()
    stage:setPosition(-10, -10)
   GTween.new(stage, 0.25, {x = 0,y = 0}, {delay = 0, ease = easing.outBounce })
end

SPDApps

thanks it work :D

Teranth

@glennbjr nice simple and easy, I might just steal that function for my utilties.lua file lol

ar2rsawseen

Hmm, that gives one great idea, simple feature to add to my app.
Should look cool together with vibrations
Thanks ;)

talis

this is really good, just with one parameter i used it to animate my buttons after onclick.
Thanks for the idea @glennbjr.

--will shake the object just pass your button object for test
function shake(object)        
object:setPosition(object:getX()-3, object:getY()-3)
GTween.new(obje, 0.25, {x = object:getX()+3,y = object:getY()+3}, {delay = 0, ease=easing.outBounce })
end

talis

@Teranth another treasure for the utilities.lua :ar!

ar2rsawseen

Took a liberty of adding this to FAQ ;)

Teranth

@talis indeed your function is going there for sure, I like the fact you can use it on pretty much any sprite. :)

talis

credits go to @glennbjr i just added a parameter to it and changed the coordinates . =D>

glennbjr

Ahh gosh, thanks :\">

petec

Thanks @talis and @ glennbjr - that will be useful.

In case it's any use to anyone else, I've also made a function based on that to pulse the size of a button as that's what I needed for something I'm working on:

function pulse(object,scl)
	if scl ~= nil then
		object:setScale(scl)
	else
		object:setScale(1.2)
	end
	GTween.new(object, 0.2, {scaleX=1,scaleY=1}, {})
end

Has optional scl parameter to set the scale to pulse to (can be less than 1 to make the object smaller). If no scl set, then it defaults to making it 1.2x original size.

Teranth

@petec, neat I will have to test that out too :) Thanks for sharing.

Gracille

@talis

I tried using your code but i cant shake the Flask image,
can anyone tell whats wrong with my code? thanks...
heres my code

shakey = gideros.class(Sprite)
function shakey:init()

local bg = Bitmap.new(Texture.new("images/Main Menu/BG2.png"))
self:addChild(bg)

local object = Bitmap.new(Texture.new("images/Main Menu/Flask.png"))
self:addChild(object)
object:setPosition(150, 40)
object:addEventListener ("click",

function shake(object)
object:setPosition(object:getX()-3, object:getY()-3)
GTween.new(obje, 0.25, {x = object:getX()+3,y = object:getY()+3}, {delay = 0, ease=easing.outBounce })
end)

local bup = Bitmap.new(Texture.new("images/Backbtn.png"))
local bdown = Bitmap.new(Texture.new("images/Backbtn1.png"))
local backbtn = Button.new(bup, bdown)
backbtn:setPosition(3, 170)
self:addChild(backbtn)

backbtn:addEventListener ("click",
function()
sceneManager:changeScene("mmenu", 0.3, SceneManager.crossfade)
end)

Gracille

the error dialog when I run it was this:

shakey.lua:13: '(' expected near 'shake'

ar2rsawseen

I think that this:

function shake(object) 
object:setPosition(object:getX()-3, object:getY()-3)
GTween.new(obje, 0.25, {x = object:getX()+3,y = object:getY()+3}, {delay = 0, ease=easing.outBounce })
end)

Should be like this:

function shake(object) 
    object:setPosition(object:getX()-3, object:getY()-3)
    GTween.new(obje, 0.25, {x = object:getX()+3,y = object:getY()+3}, {delay = 0, ease=easing.outBounce })
end

No need for ) at the end of the function

talis

@Gracille Addition to @ar2rsawseen post working functions are below. Also iparameter of the function and gtween obje is not same. So here is the working and correct one for sure:)
P.S : Tested:)

--change the value 5 to change the shake distance
function shake(obje)        
 obje:setPosition(obje:getX()-5, obje:getY()-5)
 GTween.new(obje, 0.25, {x = obje:getX()+5,y = obje:getY()+5}, {delay = 0, ease = easing.outBounce })
end

Gracille

thanks for the reply @ar2rsawseen and @talis...

@talis I tried your code but the error is still the same. :(

talis

@Gracille as i said before this is the code i am using in my own applications and it is %100 working.
In your implementation ther must be something wrong. So please post your whole code here and we can correct.

Gracille

heres my code:

shakey = gideros.class(Sprite)
function shakey:init()

local bg = Bitmap.new(Texture.new("images/Main Menu/BG2.png"))
self:addChild(bg)

local object = Bitmap.new(Texture.new("images/Main Menu/Flask.png"))

self:addChild(object)
object:addEventListener ("click",

--change the value 5 to change the shake distance
function shake(object)
object:setPosition(object:getX()-5, object:getY()-5)
GTween.new(object, 0.25, {x = object:getX()+5,y = object:getY()+5}, {delay = 0, ease = easing.outBounce })
end
-------
local bup = Bitmap.new(Texture.new("images/Backbtn.png"))
local bdown = Bitmap.new(Texture.new("images/Backbtn1.png"))
local backbtn = Button.new(bup, bdown)
backbtn:setPosition(3, 170)
self:addChild(backbtn)

backbtn:addEventListener ("click",
function()
sceneManager:changeScene("mmenu", 0.3, SceneManager.crossfade)
end)

end

talis

@Gracille you only define the shake function but you didn't call it anywhere.
You should call the function somewhere like:
shake(bup)
shake(backbtn)
etc....

Gracille

sorry but I'm newbie to gideros and i dont know the other functions...thanks for the reply

talis

@Gracille no problem there is nothing wrong with asking and learning. Please feel free to ask anything. If i know i will help, if not someone else will:D
Time will come and you will answer my questions too. This is what this forum is for \m/

OZApps

Just a thought, have you tried to set the X and Y randomly to an offset of 3 in any direction than using a tween?

like so http://youtu.be/2_PcbQQYeic

it is just calling and setting a new position for the object periodically randomly.

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