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.