You might use Data::Dumper to show you the contents of the array you are getting, i.e.
use Data::Dumper;
...
$canvas->g_bind("<MouseWheel>", sub { Dumper( Tkx::Ev('%D')) . "\n";
Presumably the information you are looking for is in that array, just an indirection away
UPDATE: Tkx::Ev seems to return an object!!! Accessing the array would be a hack, maybe you can find the right accessor in the documentation.
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