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Re: [mediaqueries4] - Pointer size/accuracy

From: Robert Kk <umbertoko@gmail.com>
Date: Sat, 20 Apr 2013 09:18:23 +0000
Message-ID: <CAN2q5UtKDEVaqanFJQsXnZJoaG74M7g+XPy=K25qPd0__UQNLg@mail.gmail.com>
To: "Tab Atkins, Jr." <jackalmage@gmail.com>
Cc: www-style list <www-style@w3.org>
The display device problem is, that I will make action fields very good
usable on small displays. If you use your finger, browser should say me
"very coase" (by very high resolution) or "coase" by smaller resolution or
by usage of drawing stick. That have pixel, dpi and/or pointer device type
as source of the problem, not only pixels, right?

At moment I have no examples for accuracy > 150 px.

I think, it is possible, that there are other types of usage of web browser
like painting on canvas or games, which will know, how exactly a pointer
can be used... But it is not my beer. Sorry. Please ask html5 game
developer.

Best regards

RK
Am 19.04.2013 19:46 schrieb "Tab Atkins Jr." <jackalmage@gmail.com>:

> On Fri, Apr 19, 2013 at 4:52 AM, Robert Kk <umbertoko@gmail.com> wrote:
> > 10px and 40px are nice values. But if you have full HD on 5 inch (like
> > HTC one), your pointer size can have over 150px (very thick fingers).
> > Other users with motoric handicaps (like multiple sclerosis or
> > spasticity ... or using eyes to move the pointer) can use the web at
> > moment only by using keys (as I know) because it is too hard to hit
> > "our usual" links or buttons by using the pointer.
> >
> > I think, 150px will also be very good in this cases. But this value
> > can also be to small for 4k displays (in few years)... It's not easy
> > to look in the future. A "pointer-accuracy-max(100px)" is flexible...
> > and can be interesting for game developers (I think so).
>
> I don't understand.  The resolution of the display doesn't affect
> pixel sizes; something that's 100px on a normal screen will be the
> same size as something that's 100px on an HD screen, or a 4k screen.
> You may be accidentally thinking that the "px" unit refers to device
> pixels; instead, the "px" unit is purposely display-independent, so it
> can be used safely without worrying about the resolution of the output
> screen.  (It's the size of a device pixel on old 96dpi screens.)
>
> So, pointer sizes won't shrink over time.  Again, though, if you have
> evidence that there are pointer modes out there that are "very
> coarse", where sizes appropriate to touch-based interfaces are still
> unusably small, that would be really useful information.
>
> ~TJ
>
Received on Thursday, 2 May 2013 17:20:26 UTC

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