Bokeh Integration - Interactive Webbrowser Plotting

[vbs]

Hello gentlemen,

since I have discovered backtrader several weeks ago I am quite amazed by its capabilities and by its code quality. I still felt it would be nice to have better plotting integrated into backtrader.

In my opinion Bokeh (https://bokeh.pydata.org/en/latest/docs/gallery.html) is an awesome plotting library for Python. So I gave it a try to have backtrader make use of it. It turned out that it was not very hard thanks to backtrader's great flexibility and its modularized nature.
I also tried to integrade Plotly but it actually became pretty slow when using larger amounts of data.

I have implemented several of backtrader's internal plotting options but still alot is missing. Also it will need alot more optimizations to make it polished.

Demonstrations here:
https://verybadsoldier.github.io/backtrader_plotting/

Please find the code, installation instruction and demos here:
https://github.com/verybadsoldier/backtrader_plotting

[rob7429]

Wow - that's pretty sweet!
The interactivity of these plots are awesome.
Nice work.

[ab_trader]

Thats really cool! I was thinking to write plotter for bt using Bokeh but ended up with conceptual layout and didn't move forward a lot. Could you post the code on the github? I might be able to add something.

[vbs]

What would be the preferred way to package this? Currently the code is meant to include some plotting classes for backtrader. So currently I am thinking about two options:

• create a seperate package, e.g. backtrader_plotting. This would reflect the intent to be a package which provides general plotting extensions for backtrader. I am especially unsure if @backtrader would be fine with the name since it is very close to the original backtrader name and people could think it is an official package or in any way related to the official repository. I do not want to offend anyone.

• another option would be to try to get it into backtrader_contrib. But it seems the idea of the contrib repo did not really take off so far as it still has no commits. Also as I don't really know the background of the split, I am unsure if I understand its real intent. Also I am still hoping and begging that @backtrader will not abandon this great project :)

[ThatBlokeDave]

@vbs

Great work! I am also a fan of Bokeh too...

My 2 cents would be to try backtrader_contrib first. Once the first commits start coming in, I am sure others will follow. I think half of the reason it has not taken off so far is that @backtrader has not been so active as of late. We had a couple of projects (like @Richard-O-Regan's basic trade stats and @Ed-Bartosh's CCXT integration) which would be ideal additions to the backtrader_contrib repo.

[vbs]

I would like to push the code I have now to Github so you guys can play around with it. I would prefer to put it in a seperate project backtrader_plotting for the moment while I am developing it. Mainly to be able to keep it seperated from other features/bugfixes I have in my BT version. When/if this stuff gets to a reasonable state then I would like to try to get it into backtrader/backtrader_contrib. As a new version of BT was released recently I have a bit of hope that it will has a future.

Do you guys think someone could feel offended by putting it on github as backtrader_plotting for now? I am not good at these legal things and I am still confused about what happened with this license issue recently that lead to the development stop.
I tried to send a PM to @backtrader to ask him directly but it is not possible on the forums and I didn't find another way to contact him.

[backtrader]

The future is for sure bright.

Do you guys think someone could feel offended by putting it on github as backtrader_plotting for now?

No.

I am not good at these legal things and I am still confused about what happened with this license issue recently that lead to the development stop.

If you put on GitHub and keep the GPL part GPL, there is no issue. You can license your part with any license of your choice which is GPLv3 compatible (changes to GPL portions of the code are still GPL) This chart should give you an idea about compatibility

From: https://www.gnu.org/licenses/quick-guide-gplv3.en.html

(Unless I am wrong, the X11 license is also known as MIT, bearing no specific references to the X Consortium)

[vbs]

Ok thank you, that's great. I have put it here for now:
https://github.com/verybadsoldier/backtrader_plotting/tree/develop

It is really work in progress currently. Anything is questionable :) But feel free to test it and I am happy about feedback. As I have nearly no experience with actually using backtrader yet, I am especially interested in feedback about what is missing or should be changed to make this really useful in an everyday productive environment.

I have put some demos here which show the two currently available plotting modes (Single and Tabs) and also the two built-in schemes (Blackly and Tradimo, basically dark and bright):
https://verybadsoldier.github.io/backtrader_plotting/

[USMacScientist]

@vbs You might want to have a look at Beaker X and their time series interactive plots:

https://nbviewer.jupyter.org/gist/anonymous/7450f2ef784f72f5811ee54ed3d97fdb

[vbs]

@usmacscientist
Thank you, that's interesting. Looks pretty similar to what Bokeh can do, I think. Do you have any particular feature or ability of them in mind?

[A Former User]

@vbs thanks for posting. I tried this out but I'm seeing the following issues:

from ..schemes import PlotMode
--> ImportError: cannot import name 'PlotMode'

After fixing this by using from ..schemes import PlotScheme as PlotMode, I get the following error:

from ..schemes import Blackly
--> ImportError: cannot import name 'Blackly'

Apparently this scheme is missing?

[vbs]

@cheez
Yes you are right, sorry my bad. Please try again with latest commit.

[duality_]

What I miss here is the ability to zoom.

[vbs]

There are two ways to zoom, both in the toolbar on the left:

• Box zoom: click and then drag a rectangle on the plot to zoom into
• Wheel zom: use mouse wheel in the plot to zoom both axis. Or center the mouse over the x- or y-axis and then use mouse wheel to zoom that axis seperately

[vbs]

Pushed a new version to github. Basically improved handling of multiple strategies and/or multiple data feeds in the mix. Also improved analyzer visualization by providing table models for all analyzers included in backtrader.

Next on my list is support for optimization results...

[vbs]

Updated version with support for optimization results.

Also updated project page on github with an ready-to-run example.

[Paduel Gerion]

Thanks vbs. Great job, and very useful!

[A Former User]

@vbs I am now seeing the following error:

from backtrader_archive.data.convert import nanfilt
ModuleNotFoundError: No module named 'backtrader_archive'

[vbs]

I am sorry, it wasn't meant that way. Should be fixed now.

[A Former User]

I've been using this for the last few days. Very helpful, thank you for creating it.