Re: pan, rotation, move and zoom request events

Hit testing will also be important for touch-screen interfaces,
  so the user doesn't have to touch exactly at a small point, but
  can be given a radius of uncertainty by the underlying
  application. 

Richard Schwerdtfeger writes:
 > Hi Jason,
 > 
 > Zoom should first be driven by hit testing in the browser. If you have a point within an object the zoom event should be generated at the object hit and then the object
 > should manage the zoom from that point. The application needs to make the decision how it zooms once the event is received. This will be particularly important, for example,
 > if you have something like a flow chart and your browser deems the hit to be within a line. The application may find the point toward the end of the line and want to zoom
 > around that point. We will need these concepts when we apply zooming to SVG and HTML5 Canvas.
 > 
 > So, the x,y coordinates are essential. There may be some instances, such as text, or UI controls the app. may wish to zoom off center of the x,y coordinate.
 > 
 > Rich
 > 
 > Rich Schwerdtfeger Th
 > 
 > InJason White ---03/11/2013 05:44:43 PM---James Craig <jcraig@apple.com> wrote:
 > 
 > From: Jason White <jason@jasonjgw.net>
 > To: public-indie-ui@w3.org,
 > Date: 03/11/2013 05:44 PM
 > Subject: Re: pan, rotation, move and zoom request events
 > -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 > 
 > James Craig <jcraig@apple.com> wrote:
 > 
 > > I think that depends on the application. In most cases, I would expect the
 > > zoom event to be centered on the x/y coordinates if they were provided. If
 > > origin coordinates are not provided, zoom would probably be centered in the
 > > middle of the current view.
 > 
 > That's reasonable. Could you perhaps clarify it in the text without
 > unduly limiting what applications do?
 >

Received on Thursday, 28 March 2013 22:55:21 UTC