Problem about pressing 'x' or 'y' key while panning

Hi,

I’m sorry to ask for help as a new user by this maillist. I sent a message to user list, but there is no answer over one week.

The problem is: for my code, If I
press ‘x’ or ‘y’ while panning, the motion still don’t be constrained to the
x or y axis respectively. The feature is important to my work, but currently i have not yet gotten the trick.

For your information, NavigationToolbar2GTKAgg is used, and pick event is defined.

Any help will be appreciated.

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sunzen
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