Thinking about touch events for interaction on high DPI displays

[dhcole]

@tmcw Curious what you think about having wax do a little more to help fire touch events. Maps with small hot spots, like with markers that are only a few pixels wide, are very difficult to hit on hi res touch displays. Seems like this is because touch events just return a single coordinate, yet its its hard to match that coordinate up with a small hot spot.

What do you think about something like a touch buffer of 10 or so px where wax will look within this buffer and hit a nearest neighbor hot spot to the touch coordinate.

cc @yhahn

[tmcw]

Is this something we should fix at the Wax level? Like these maps sound like they'll be suboptimal anyway, and if a project like Modest Maps takes the MapBox Streets approach to Retina tiles (halves them to 128 if the ratio is 2x) then non-optimized interaction layers would be upsampled and still be fine.

[springmeyer]

interested as well. this hardcoded hack exists for the iPad and is likely insufficient with the newer higher res displays.