- From: Patrick H. Lauke <redux@splintered.co.uk>
- Date: Thu, 2 Mar 2023 10:55:27 +0000
- To: public-pointer-events@w3.org
Some further information on this "finger wheel": note that there is no specific "meaning" to what the wheel itself does in applications, and it can generally be remapped (for instance, in Photoshop, the default mapping is for opacity, which is then different from the default mapping for pressure which generally relates to how thick/wide a brush stroke is ... but users often remap the wheel to control brush size instead). There seems to be some confusion (or rather, a lack of detail) what this "finger wheel" should map to? I initially was convinced this would be tangentialPressure/barrel pressure, as that's what we say in our spec. This came about from Dave Fleck (at Wacom) telling us that that's what the wheel maps to tangential pressure (aka barrel pressure) in the HID definition https://github.com/w3c/pointerevents/issues/25#issuecomment-152013055 / https://www.usb.org/sites/default/files/documents/hut1_12v2.pdf The name tangentialPressure for this property is perhaps a bit misleading, but we adopted it because that's what Apple map this as https://developer.apple.com/documentation/appkit/nsevent/1525959-tangentialpressure ... but perhaps we should clarify somewhere that in practice this value may be used for other things that are not really "pressure" related/that a user/apps often remap this to something else. P -- Patrick H. Lauke https://www.splintered.co.uk/ | https://github.com/patrickhlauke https://flickr.com/photos/redux/ | https://www.deviantart.com/redux twitter: @patrick_h_lauke | skype: patrick_h_lauke
Received on Thursday, 2 March 2023 10:55:42 UTC