On Thu, Jun 4, 2009 at 8:49 AM, Ole Streicher <ole-usenet-s...@gmx.net> wrote:
setParent(parent)
> self.mpl_connect('motion_notify_event', self.on_move)
>
> def on_move(self, event)
> mouse_pos_diag_x = ???(event.xdata)
> mouse_pos_diag_y = ???(event.ydata)
> lower_limit_diag_y = ???
> upper_limit_diag_y = ???
> ...
>
> where I would need to replace the ??? with some transformation from
> event.xdata, event.ydata, and the min and max of the y axis. How could I
> do that?
The mouse event object already has display coords attached in the
event.x and event.y attributes. See
http://matplotlib.sourceforge.net/api/backend_bases_api.html#matplotlib.backend_bases.LocationEvent
and
http://matplotlib.sourceforge.net/users/event_handling.html
But to answer your question about matplotlib transforms. You could do
ax = event.inaxes # the axes the event occurred in
x, y = ax.transData.transform_point((event.xdata, event.ydata))
and you should get the same answer.
JDH
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