How to adjust the size of graph.

[peacerider]

Hello,
I am now learning backtesting.py.
Could someone tell me how to change the size (height) of the graph.

Example
I want to adjust the height of the MACD figure below.

I wached the comment in the source code.
"The height is currently non-adjustable."
https://github.com/kernc/backtesting.py/blob/master/backtesting/backtesting.py

[peacerider]

I changed the parameter of the source code directry.

[Rydo111]

@peacerider is correct. If you look at _plotting.py, you'll find the height settings of each section. For example, the main chart height is configured on line 221 (height=400). You could manually change this to whatever you want; or, I added a parameter to def plot on line 176 that I then passed to new_bokeh_figure. You can do the same for new_indicator_figure on line 277.

Hope this helps.

[peacerider]

Thank you for your help, especially about the second half of the advice!

[Rydo111]

No worries. The plotting code is quite good, and very useful by itself outside of the utility of backtesting. I'd like to contribute to the code if I can...I'm a bit of a noob when it comes to Git (and to coding in general tbh), so I don't really know how the whole process works (forking, push request, etc.). I'll do some study and see if I can make some suggestions directly into the code.

[peacerider]

Thanks, I am also beginer of Git.

[Rydo111]

Hey @peacerider, for your interest, I managed to fork the repo, integrate this into my pycharm and now I am pushing commits to my repo. Its like magic! ;).

I've made some code changes you may be interested in. My repo is https://github.com/Rydo111/backtesting.py.git. Things I've played with:

• created a hook in plot to control the line thickness of indicators
• created a relative volume segment, that sits above the OHLC plot and dynamically re-scales when the x-axis changes.
• added a parameter called ohlc_height to plot to gain greater control of the OHLC plot segment

I'm going to keep messing about...I don't think I'll try to do any push requests...my code isn't really good enough.

[sanketgarade]

here is a simple patch (to override the existing height parameter) that you can put in your own script where you run bt.plot()

# override existing indicator plot heights ---- start
import backtesting._plotting as bt_plotting

# Override the default indicator height globally
bt_plotting._INDICATOR_HEIGHT = 200
# override existing indicator plot heights ---- end