#6 marker binding failure

[Anonymous]

on windows, the following binding fails to be activated
(nothing is printed):

blt::stripchart .b
pack .b
set m [.b marker create polygon -fill {} -coords {0 0 0
1 1 1 1 0}]
.b marker bind $m <Enter> {puts enter}

Filling with a solid color makes it work.

[George A. Howlett]

Logged In: YES
user_id=137748

This is supposed to be a feature. But I'm not so sure
that it really is.

If you configure -fill to the empty string {}, then
no fill color is drawn and the polygon marker is
considered to be just the outline. Hence, <Enter>
and <Leave> events will only trigger on the outline.
I think this is similar to the way the canvas widget
works.

But this seems wrong on several counts.

1) I don't think behavior this is documented anywhere
in the graph manual (very bad).
2) There's no useful distinction between a polygon marker
with no fill and a line marker.
3) It seems like an incredible useful thing to be able
to bind to arbitrary regions. You should be able
to bind to a totally invisible polygon marker.

I don't think this will be hard to change (after all the
behavior isn't even documented yet). Let me know
what you think.

--gah

[Nobody/Anonymous]

Logged In: NO

Dear George:

I agree with your comments.

The thing is that it works on Linux and I use that feature (in moodss) to activate the crosshair and pointer
tracking (to display the x y values in a message area as the mouse pointer is moved) when the pointer
enters a graph area. I notice that it did not work the same way on Windows.

It would be great if you could make it work on Windows as well, or if that is too hard show me a way to do
the above in another manner.

In any case, many thanks for your great package!

Best regards,

Jean-Luc