Support for higher pixel density about pt HOT 4 CLOSED

Yep, it's a problem. Looks like we would need to implement something insane to check pixel ratio, like this one:
http://www.html5rocks.com/en/tutorials/canvas/hidpi/

Or are there a more elegant solution?

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Looked around a bit and it seems like a lot of people have solved the problem like that (ctx.scale()).
Not sure how easy this is to implement though in a library like Pt.

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@tofuness I pushed a fix today. Pt now supports retina automatically, and you can turn it off by the devicePixelSupport parameter in CanvasSpace's display function.

And Pt now supports multi-touch as well! See Space's bindTouch and add a onTouchAction handler to your items in space.

Here's a quick test demo (try it in mobile): http://williamngan.github.io/pt/demo/mobileapp.html

Give it a try and let me know if you find any issues. Cheers!

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Tried it out and it LGTM. I'll let you know if I run into any new problems. 👌

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