[matplotlib-devel] scroll wheel on wx

[Paul K. <pki...@ni...>]

Hi,

I have a patch which implements the scroll wheel on wx using the
wx mouse wheel event.

Rather than a simple up/down mouse event wx uses:
    delta: intervals per click
    rotation: number of clicks
    rate: number of lines per click

I convert this to: 
    step = rotation*delta/rate

I've added the step attribute to the mpl MouseEvent in addition to the
usual up/down button (up if step >= 0, down otherwise).  

I removed the mpl_connect from the scroll event to pick.  I don't know
why it was there.

I tested the patch on OS X WxAgg examples/image_slice_viewer.

Let me know if it is okay to post to svn, or if we are still in feature
freeze.

	- Paul