Change/extend zoom (direction/public api)

[gossi]

I was kinda confused, when I mousewheeled down and my graph gets smaller. Somehow I expected a zoom-in. So I switched over to google maps and yep, that's where my habituation comes from. I don't know of other services right now, that have zoom implemented to check, but I'd think gmaps is the most and well known zoom service and most people are habituated with that direction of zoom, so it's a good reason to change it.

Anyway, is there some kind of public API, where I can set the zoom from outside? Like graph.zoom(value) ? Is there a chance to get the zoom value like graph.getZoom() or just via the MouseWheel event? What about boundaries, min and max zoom. With that one could build a slider around the graph.

[philogb]

What browser are you using?
Mousewheel down zooms-out in my computer both the viz and the maps.

[gossi]

Yeps, but I expected the opposite. See this metapher:

Mousewheel down = Pull content to me = zoom-in
Mousewheel up = Push content away from me = zoom-out

[philogb]

Oh, that isn't documented, but it can be done by setting the zooming value to a negative value, for example zooming: -10. I'll think about how to design the zooming options to also accept methods. Thanks for your feedback.

[gossi]

Ah nice. That works pretty well - thanks.

So I encountered some behaviors while testing zoom:

• Chrome and Safari (Webkit?) are far more sensible with the scrolling value than Opera and FF are (I have no IE).
• Zooming gets reverse. When zooming in and in and in, the zoom turns at a point 'zero' and zooms out with the nodes mirrored in the graphs origin.