Best way to connect bar sink drain/vent to bathroom rough in

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Bob Stewart

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Hi.

I am in midst of finishing the roughed in full bath and want to put a bar sink on the wall behind the tub.
I will add pictures later- once I am able to get some good shots....

The way it was roughed in- I have the lav sink on the left, and the toilet on the right. On the opposite wall is the tub drain. Here is a mock up:
Screen Shot 2015-03-31 at 11.03.55 AM.png

I am assuming that the rough-in for the full bath is correct, and everything is vented properly. The solid red lines are what is there today as well as the vent stack- at least what I believe is there. I can only see the rough ins sticking out of the floor for the toilet, and the tub drain in the ground. The dashed lines are what I was planning to do. My plan is to tie the bar sink drain to the tub drain- since they share a wall. I was hoping that however the tub is vented- the bar sink would just use the same vent. But after reading many threads on here I am not so sure.
If this is not a good idea, please help me to figure out what I can do.

Thanks!

Added pictures of the tub drain set up as is.

The tub drain pictures show how I plan to tie in the bar sink drain.The tape is covering the bar sink drain. Is this correct? What about venting? It is a 2" pipe for the tube drain under the slab.IMG_0169.JPG IMG_0168.JPG
 
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