Automatic Screen Scaling vs Pixels Per Inch

cubuspl42 · May 2013

Let's say there are two devices - 4" smartphone A and 10" tablet B.
If A and B have same screen resolution, will Gideros treat them in the same way? If I want the button to be 20 mm (real-world mm) on both devices, can I achieve this with Gideros?

ar2rsawseen · May 2013

Well, if the resolution is the same, but dimensions of device in real world are different than the size of the button in real world, would also be different. As the scaling is proportional, at least Letterbox is.

I haven't tried to achieve this, but there is a function:

application:getScreenDensity()

Which should return the screen density in pixels per inch. You could use that to calculate the button size yourself

cubuspl42 · May 2013

Ok, so can I use getScreenDensity together with setLogicalDimensions and both ASS and Automatic Image Resolution will work? Is AIR ok with logical dimensions set at runtime?

ar2rsawseen · May 2013

As I said I haven't tried that, but theoretically yes, you should be able to calculate the real dimensions. The way you calculate it will depend on what exactly ASS you will be using.

What do you mean by AIR?

cubuspl42 · May 2013

AIR is Automatic Image Resolution - I didn't want to be cool, I used it after mentioning the full name

Sorry, I'm lazy

ar2rsawseen · May 2013

Yes I think it should be cool with that

Platypus · May 2013

I'm not confident that every manufacturer's device will return a value.

Does the following code return a value on your mobile device;
or does it display "Pixel Density Unknown"?

It would be very helpful if many people would run the following code on as many different devices (not simulators) as possible, and report the results in this thread.

local densityEnquirer = application:getScreenDensity()
 
local words = TextField.new(nil, "Pixel Density Unknown")
words:setPosition(107, 222)
stage:addChild(words)
 
if densityEnquirer then
 
words:setText(densityEnquirer.." pixels per inch")
 
end

ar2rsawseen · May 2013

@Platypus I think that nil value is only for desktop pcs and Macs (and maybe some other future platforms), all devices that I know (Android and IOS) return screen density

Platypus · May 2013

@Ar2rsawseen,
That's good news. Thanks.

(Off topic: By the way, did you submit your thesis?)

ar2rsawseen · May 2013

Will be doing that this Monday

Platypus · May 2013

Fantastic! Good luck.

ar2rsawseen · May 2013

Thanks

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