- From: Helder Magalhães <helder.magalhaes@gmail.com>
- Date: Sun, 19 Dec 2010 18:09:44 +0000
- To: Kevin Ar18 <kevinar18@hotmail.com>
- Cc: a.neumann@carto.net, public-fx@w3.org, www-svg@w3.org
Hi Kevin, > The issue is that sometimes it would be nice to > have the svg trigger events directly without requiring a rectangle. I ran > into a particular situation where this was desirable. Right. I ran into this issue several time also. This is addressed in SVG Tiny 1.2 by the 'viewport-fill' - and related 'viewport-fill-opacity' - properties [1]. I haven't double checked if pointer events were triggered in this case but, intuitively, I'd say they should. > One issue is that I > must constantly resize and move the rectangle around as the svg canvas area > changes size and the viewBox moves around. In the end, the code must move > and resize both the svg and a rect (in sync) to make it work right; this is > not really the most desirable method. However, in the end, I can always > find a workaround to these issues. Right again. I've done this by registering in several SVG events (zoom, resize, scroll) and then apply an inverted matrix transform to the canvas rectangle (obtained via 'getScreenCTM'). It works well enough, although naturally introduces some processing overhead, slightly noticeable in at least IE+ASV (recent Gecko and WebKit based browsers tend to perform very well, BTW). ;-) Hope this helps, Helder [1] http://www.w3.org/TR/SVGTiny12/painting.html#viewport-fill-property
Received on Sunday, 19 December 2010 18:11:34 UTC