please explain how to work with accelerometer

konstantin · October 2011

hello, I am totally new and I am trying to figure out how to respond to accelerometer events such as device shaking. In Corona SDK they have an event for this, is it implemented in Gideros? Also, in the player I see no option to emulate device shaking, do you have plans to add this?

atilim · October 2011

Hi,

you can get the coordinates of the accelerometer by calling

local x,y,z = application:getAccelerometer()

Unfortunately we don't have direct support for shake detection. But it's also very easy to implement. Today, I can post an example here.

We don't put this option to desktop version of Gideros Player because you can test your application on real device immediately. You can deploy GiderosiPhonePlayer.zip (which comes with the insallation) to your iOS device, then press play and shake it

gorkem · October 2011

A detailed overview of how to deploy Gideros Player to iPhone or Android, use the related Wiki entry here:

http://www.giderosmobile.com/DevCenter/index.php/Deployment

Once you deploy the player to your device, you'll rarely need the Player on your desktop as you'll be able to test your app immediately on your real device.

Let us know in case you have a problem with this.

konstantin · October 2011

thanks. now that you have mentioned deployment: I do not have to have the player installed on the devices, of course, when I distribute my app to the users. this is only for development, right? your sdk can compile Lua to native code, right?

@atilim, an example would be very useful.

regarding testing on a real device: it would be nice, but one of the reasons why I am looking at gideros sdk is because it promises me an ability to develop for iOS/Android using windows and a device simulator. I do not have the devices (yet), I would like to develop my app first and then see how it goes to justify buying the device(s).

gorkem · October 2011

You do not have to have a device for development, as you mentioned.

When you are comfortable with the progress of your app, you may choose a device for testing.

Yes, Gideros Studio compiles your Lua code to native code.

Feel free to share your progress here

We'd be glad to know.

alexzheng · March 2012

Hi,

you can get the coordinates of the accelerometer by calling
local x,y,z = application:getAccelerometer()
Unfortunately we don't have direct support for shake detection. But it's also very easy to implement. Today, I can post an example here.

We don't put this option to desktop version of Gideros Player because you can test your application on real device immediately. You can deploy GiderosiPhonePlayer.zip (which comes with the insallation) to your iOS device, then press play and shake it

hi, Is shake detection supported now?

ar2rsawseen · March 2012

Here is a really quick a not so sophisticated method of detecting shakes:

require "accelerometer"
 
accelerometer:start()
 
local last_x = 0
local last_y = 0
local last_z = 0
 
local interval = 100
 
local threshold = 500
 
local function detectShake()
	-- get accelerometer values
	local x, y, z = accelerometer:getAcceleration()
 
	local speed = math.abs(x+y+z - last_x - last_y - last_z)/ interval * 10000;
	if(speed > threshold) then
		print("shaking")
	end
	last_x = x;
	last_y = y;
	last_z = z;
end
 
local timer = Timer.new(interval)
timer:addEventListener(Event.TIMER, detectShake)
timer:start()

I don't know maybe there's something better available, but it kind of does what it needs. You can adjust threshold to suit your need.

ar2rsawseen · March 2012

I think there is no internal Gideros shake detection only because Atilim is pretty stressful about code optimization. And shake event would only be another task that will be checked on every iteration, consume resources, and rarely used.

MikeHart · March 2012

Yes, Gideros Studio compiles your Lua code to native code.

Huh??? New feature? From what I know, just like C*r*na, it compiles your Lua code to Lua bytecode and binds it with the framework into a native app project. How you said it, it would translate/compile LUA into Objective-C on IOS and JAVA on Android. I would be totally surprised if it does.

ar2rsawseen · March 2012

)
I think you're right Mike.

alexzheng · March 2012

hi @ar2rsawseen
thanks for your code!
It's a really quick method but not so efficient,it would be best if gideros sdk support shake detection nativly.
Maybe use UIEventSubtypeMotionShake event, I am not sure.

ar2rsawseen · March 2012

Well, if you need IOS you can always use plugins.

But how about polls and votes? How democratic is (cough)Atilim(cough), ehmm, Gideros?

Magnusviri · March 2012

Shake detection is hard. Before Apple released their API I spent several days on it and never did find what I wanted (nuanced shake detection). A shake while riding in a bus or walking is not the same as a shake while sitting on a stable chair. I don't like Apple's method for finding shakes either. For some reason it never works when I actually want it but always works when I don't want it.

Zoyt · March 2012

It's in the roadmap... It can't be that hard.... Can it?

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