I'll check out the clickReset.
constrainZoomTo 'xy' would fix the zoom area to a single point. Think
of contrainZoomTo x as "exclude zoom along y axis" and contrainZoomTo
y as "exclude zoom along x axis". You wouldn't want to exlcude both x
and y.
Maybe I picked the wrong name for the property. Maybe it should have
been "zoomAxis" and then 'xy' would make sense and be more obvious and
'none' would obviously mean "no zooming".
--
Chris Leonello