- From: Patrick H. Lauke via GitHub <sysbot+gh@w3.org>
- Date: Sun, 20 Dec 2015 21:21:23 +0000
- To: public-touchevents@w3.org
patrickhlauke has just created a new issue for https://github.com/w3c/touch-events: == rotationAngle range of 0-90 seems counterintuitive - add a diagram? == Maybe it's my own failing, but for the longest time I kept thinking that rotationAngle must be 0-180 degrees, rather than 0-90. Intuitively, it seems that if i place a thumb on a screen pointing to 9 o'clock, and rotate it clockwise to 3 o'clock, it should go from 0-180 (for the rest of the full rotation, from 3 to 9 o'clock clockwise, i can sort of understand how the shape of the ellipse is effectively mirrored/flipped from the previous one). Observing actual values on my Nexus 10, the one bit that seemed to be missing from the spec was the fact that starting at 9 o'clock, as i proceed towards 12 o'clock, rotationAngle grows from 0 to 90, and then at 12 o'clock radiusX and radiusY "flip" (what was radiusX before becomes radiusY, and vice versa), and now the rotationAngle is at 90 and proceeds to 0 as i get towards 3 o'clock. I wonder if some form of diagram, and some additional explanation for radiusX/radiusY, may be necessary here. Please view or discuss this issue at https://github.com/w3c/touch-events/issues/53 using your GitHub account
Received on Sunday, 20 December 2015 21:21:25 UTC