# Points in scope sink are missing when zooming in and out

**URL:** <https://www.ruby-forum.com/t/points-in-scope-sink-are-missing-when-zooming-in-and-out/241882>\
**Category:** GNU Radio\
**Created:** [May 8, 2015, 1:57pm UTC](https://www.ruby-forum.com/t/points-in-scope-sink-are-missing-when-zooming-in-and-out/241882 "2015-05-08T13:57:58Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [May 8, 2015, 1:57pm UTC](https://www.ruby-forum.com/t/points-in-scope-sink-are-missing-when-zooming-in-and-out/241882/1 "2015-05-08T13:57:58Z")

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For debugging or other purposes, sometimes I use time domain scope sink.

When I zoom in and out, points in the scope are missing.

For instance, flow graph generates a stream:

1111111111000000000011111111110000000000 (ten ones and zereos are  
repeating)

After hitting buttons zooming in and out, the scope shows:

…1…1…1…0…0…0…1…1…1…0…0…0…1…1…1… (n ones and m zeros  
are  
repeating, n, m \< 10)

I think this issue related with some graphic interface. Is it a know  
issue?

Regards,  
Jeon.

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**Author:** ![Jeon](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e8c25b/32.png) [@Jeon](https://www.ruby-forum.com/u/Jeon)\
**Post date:** [May 8, 2015, 2:13pm UTC](https://www.ruby-forum.com/t/points-in-scope-sink-are-missing-when-zooming-in-and-out/241882/2 "2015-05-08T14:13:45Z")

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Hi Jeon,

is this QT or WX Gui?

Greetings,  
Marcus

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<div class="post-metadata">

**Author:** ![Jeon](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e8c25b/32.png) [@Jeon](https://www.ruby-forum.com/u/Jeon)\
**Post date:** [May 8, 2015, 2:37pm UTC](https://www.ruby-forum.com/t/points-in-scope-sink-are-missing-when-zooming-in-and-out/241882/3 "2015-05-08T14:37:43Z")

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I am using WX.

I miss some details in the previous post.

It doesn’t happen when I hit zoom in and out one or two times.  
It happens after hitting zoom in and out 4, 5, 6, … times. Not sure  
exact  
value.

Also, it seems the duration of each bits are unchanged.  
i.e., ten ones before zooming and several ones after zooming have same  
duration.

For additional information,  
I am using GRC 3.7.6 on Ubuntu 14.04 (kernel 3.13) on VMWare assigned 2  
CPUs (i7 3770) and 4 GB ram.

Regards,  
Jeon.

2015-05-08 21:09 GMT+09:00 Marcus Müller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

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**Author:** ![Jeon](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e8c25b/32.png) [@Jeon](https://www.ruby-forum.com/u/Jeon)\
**Post date:** [May 9, 2015, 8:47am UTC](https://www.ruby-forum.com/t/points-in-scope-sink-are-missing-when-zooming-in-and-out/241882/4 "2015-05-09T08:47:12Z")

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Dear, Marcus

That’s OK. It’s not a problem related with actual communication behavior  
or  
something.  
I was just curious about that 🙂

Regards,  
Jeon.

2015-05-08 21:49 GMT+09:00 Marcus Müller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

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<div class="post-metadata">

**Author:** ![Jeon](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e8c25b/32.png) [@Jeon](https://www.ruby-forum.com/u/Jeon)\
**Post date:** [May 8, 2015, 2:54pm UTC](https://www.ruby-forum.com/t/points-in-scope-sink-are-missing-when-zooming-in-and-out/241882/5 "2015-05-08T14:54:39Z")

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Hi Jeon,  
sorry, I really can’t reproduce that. Can you provide a minimal  
flowgraph that we can use to test?  
Generally, GNU Radio slowly moves away from WX towards QT, so if that’s  
an option, use QT.

Best regards,  
Marcus