Crashes on example code

[AgainPsychoX]

My code:

from time import sleep
import pygame
import sys
import math
import numpy as np
import matplotlib
import matplotlib.pyplot as plt

matplotlib.use('module://pygame_matplotlib.backend_pygame')

fig, ax = plt.subplots()  # Create a figure containing a single axes.
ax.plot([1, 2, 3, 4], [1, 4, 2, 3])  # Plot some data on the axes.
plt.show()

Log:

ygame-ce 2.4.0 (SDL 2.28.5, Python 3.10.11)
Traceback (most recent call last):
  File "D:\Projects\+school\SR\projekt\main.py", line 19, in <module>
    plt.show()
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\pyplot.py", line 527, in show
    return _get_backend_mod().show(*args, **kwargs)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\pygame_matplotlib\backend_pygame.py", line 369, in show
    manager.show(block)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\pygame_matplotlib\backend_pygame.py", line 545, in show
    self.canvas.draw()
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\pygame_matplotlib\backend_pygame.py", line 462, in draw
    self.figure.draw(self.renderer)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\artist.py", line 39, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\pygame_matplotlib\backend_pygame.py", line 68, in draw
    return super().draw(renderer)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\artist.py", line 95, in draw_wrapper
    result = draw(artist, renderer, *args, **kwargs)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\figure.py", line 3154, in draw
    mimage._draw_list_compositing_images(
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\image.py", line 132, in _draw_list_compositing_images
    a.draw(renderer)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\axes\_base.py", line 3070, in draw
    mimage._draw_list_compositing_images(
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\image.py", line 132, in _draw_list_compositing_images
    a.draw(renderer)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\patches.py", line 588, in draw
    self._draw_paths_with_artist_properties(
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\matplotlib\patches.py", line 573, in _draw_paths_with_artist_properties
    renderer.draw_path(gc, *draw_path_args)
  File "D:\Projects\+school\SR\projekt\venv\lib\site-packages\pygame_matplotlib\backend_pygame.py", line 176, in draw_path
    draw_func(
TypeError: function takes at most 4 arguments (5 given)

Other example (using fig.canvas.draw()) also crashes with very similar result.

[lionel42]

@AgainPsychoX Hi thanks for trying the package.

I guess you installed with pip. The version published was an old one. This is my fault.

Can you try to upgrade the package ?

pip install --upgrade pygame-matplotlib

[eleweek]

This seems to work now.

For other people: if you find this code not working with the correct version, try recreating your virtualenv and reinstalling packages from requirements.txt. For some inexplicable reason, I had to do this and it helped.

[AgainPsychoX]

I confirm it works. Sorry for late response, I wasn't much interested in my project for a while, but today I wanted to check out few my old projects and decided to revisit this thing.

In my code currently I have something like:

if USE_PYGAME_MATPLOTLIB_BACKEND:
    matplotlib.use('module://pygame_matplotlib.backend_pygame')
else:
    matplotlib.use('Agg')

and in the loop:

        if USE_PYGAME_MATPLOTLIB_BACKEND:
            fig.canvas.draw()
            surf = fig
        else: # `matplotlib.backends.backend_agg` based solution
            canvas = agg.FigureCanvasAgg(fig)
            buffer, w_h = canvas.print_to_buffer()
            surf = pygame.image.frombuffer(buffer, w_h, "RGBA")

The fig is heavy figure with multiple sub-figures, updated between drawing.

There still are some issues with the library:

• No performance improvement
• Invalid scaling for some elements (DPI related?)
• No text rotation
• No transparency

Using matplotlib.backends.backend_agg:

Using pygame-matplotlib:

The game state on above screenshots is a bit different as I needed to restart the app to change the values.

Here is link to full source code if you are interested: https://github.com/AgainPsychoX/FuzzyLogicRacingGame

[lionel42]

@AgainPsychoX Thanks that is quite a good example how the package could be improved.

Maybe if I find some time, I will try to make your example render "better" .

For the performance, I am not sure I would be able to do a lot, but it is also good to know how the package performs.