[Python] Use `StaticRenderer` subclass to render a sequence of matrices in python asciimatics...

background


I am trying implement a subclass of StaticRenderer that can render a 2d matrix of random characters over a set duration, similar to how gifs can be looped using renderers.ColourImageFile(StaticRenderer).

I want to use this subclass as the renderer argument of the Print(Effect) class' instantiator, similar to this example.

code


This is what I have implemented so far (i am setting the matrix to be the height and width of the terminal):

from asciimatics.screen import ManagedScreen, Screen
from asciimatics.scene import Scene
from asciimatics.effects import Print
from asciimatics.renderers import StaticRenderer
from asciimatics.exceptions import ResizeScreenError

import random
import time
import sys


class RandomMatrixRenderer(StaticRenderer):
def __init__(self, screen: Screen):
super(RandomMatrixRenderer, self).__init__()
self._width = screen.width
self._height = screen.height
self._matrix = self._generate_random_matrix()
self._screen = screen

def _generate_random_matrix(self):
chars = "!@#$%^&*()_+=-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
matrix = [
[random.choice(chars) for _ in range(self._width)]
for _ in range(self._height)
]
return matrix

def render_now(self):
for y in range(self._height):
for x in range(self._width):
self._screen.print_at(
self._matrix[y][x],
x,
y,
colour=random.randint(0, 7),
bg=random.randint(0, 7),
)


def random_matrix(screen):
while True:
effect = Print(screen, x=0, y=0, renderer=RandomMatrixRenderer(screen))
screen.play([Scene([effect])], repeat=False)
time.sleep(0.1) # Wait for 1 second before showing the next matrix


def main():
with ManagedScreen() as screen:
random_matrix(screen)


if __name__ == "__main__":
while True:
try:
main()
sys.exit(0)
except ResizeScreenError:
pass


problem


However, I am encountering this error:

Traceback (most recent call last):
File "/home/marcu/resources/tutorials/asciimatics/waves/matrix_render.py", line 55, in <module>
main()
File "/home/marcu/resources/tutorials/asciimatics/waves/matrix_render.py", line 49, in main
random_matrix(screen)
File "/home/marcu/resources/tutorials/asciimatics/waves/matrix_render.py", line 43, in random_matrix
screen.play([Scene([effect])], repeat=False)
File "/home/marcu/resources/tutorials/asciimatics/.venv/lib/python3.12/site-packages/asciimatics/screen.py", line 1602, in play
self.draw_next_frame(repeat=repeat)
File "/home/marcu/resources/tutorials/asciimatics/.venv/lib/python3.12/site-packages/asciimatics/screen.py", line 1705, in draw_next_frame
effect.update(self._frame)
File "/home/marcu/resources/tutorials/asciimatics/.venv/lib/python3.12/site-packages/asciimatics/effects.py", line 63, in update
self._update(frame_no)
File "/home/marcu/resources/tutorials/asciimatics/.venv/lib/python3.12/site-packages/asciimatics/effects.py", line 334, in _update
image, colours = self._renderer.rendered_text
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/marcu/resources/tutorials/asciimatics/.venv/lib/python3.12/site-packages/asciimatics/renderers/base.py", line 165, in rendered_text
return (self._plain_images[index],
~~~~~~~~~~~~~~~~~~^^^^^^^
IndexError: list index out of range


Does this have to do with the parameters stop_frame and speed in the Effect class? Or is there an issue with my matrix input?

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