Plot - maximize windows

Maxim Korobov

Inside Backtrader uses matplotlib. It's easy to make matplotlib show maximized windows (on Windows) when you can reach plotter. How one can do it when call plot() from Backtrader?

backtrader

You can subclass Plot which is in backtrader.plot and then override the method show.

The default behavior is:

    def show(self):
        self.mpyplot.show()

And you can call cerebro.plot with an instance of your subclass. See here for the signature of cerebro.plot:

https://www.backtrader.com/docu/cerebro.html#backtrader.Cerebro.plot

Note: disregard the useplotly parameter (it was a failed experiment which should be removed)

Maxim Korobov

Thank you!

It helps. Here is snippet, which maximized figure window under Windows:

import backtrader.plot as plt


class Plotter(plt.Plot):

    def __init__(self):
        super().__init__(volup='#60cc73')  # custom color for volume up bars 

    def show(self):
        mng = self.mpyplot.get_current_fig_manager()
        mng.window.state('zoomed')
        self.mpyplot.show()

...

plotter = Plotter()
back_tester.plot(plotter=plotter)

hans

Just for people working on a mac: the solution described above does not seem to work on macOS (at least not in my environment).

backtrader

The solution plotted by Maxim is one of many (apparently for the TkAGG backend)

There are several different backends and each has a different approach to the problem. For example:

http://stackoverflow.com/questions/39312957/how-can-i-maximize-my-figure-on-matplotlib-python-using-macos

And

http://stackoverflow.com/questions/12439588/how-to-maximize-a-plt-show-window-using-python/22418354#22418354

There is no single solution.

hans

An alternate, very simple, approach is to handle the window outside of backtrader. Personally I wrote a (tiny) script (in keyboard maestro, mac only) to just resize the window with a F2 keypress, exactly to the dimensions I prefer. This keeps your code clean and works simple and effective. Just run, and press a key if you want to see a bigger window with the graphical results.

phat

@hans said in Plot - maximize windows:

roach is to handle the window outside of backtrader. Personally I wrote a (tiny) script (in keyboard maestro, mac only) to just resize the window with a F2 keypress, exactly to the dimensions I prefer. This keeps your code clean and works simple and effective. Just run, and press a key if you want to see a bigger window with the graphical results.
Hey, could you share the script you made for resizing the plot window, I am having the same issue. Thanks!