Test script evaluating TileGrid and Bitmap references

reference_test.py

import gc
import time
import board
import displayio
import terminalio

class testGroup(displayio.Group):

    def __init__(self,
        color):

        # creates a Group containing a TileGrid with a 200x200 Bitmap with the given color
        self._color=color
        self.bitmap=displayio.Bitmap(200, 200, 1)
        self.palette=displayio.Palette(1)
        self.palette[0]=self._color
        self.tilegrid = displayio.TileGrid(
            self.bitmap,
            pixel_shader=self.palette,
            width=1,
            height=1,
            tile_width=self.bitmap.width,
            tile_height=self.bitmap.height,
            default_tile=0,
            x=0,
            y=0,
        )
        super().__init__(
            max_size=1, 
            x=10, 
            y=10,
        )
        self.append(self.tilegrid)


    @property
    def color(self):
        return self._color

    @color.setter
    def color(self, new_color):
        # Updates the self Group with a TileGrid containing including a new smaller 20x20 bitmap with the given color
        self._color=new_color
        self.bitmap=displayio.Bitmap(20,20, 1) # Create the new bitmap smaller.
        self.palette=displayio.Palette(1)
        self.palette[0]=self._color
        self.tilegrid = displayio.TileGrid(
            self.bitmap,
            pixel_shader=self.palette,
            width=1,
            height=1,
            tile_width=self.bitmap.width,
            tile_height=self.bitmap.height,
            default_tile=0,
            x=0,
            y=0,
        )
        super().__init__(
            max_size=1, 
            x=10, 
            y=10,
        )
        self.append(self.tilegrid)
        
# start the display
display = board.DISPLAY


# Create the original testGroup as RED
myGroup=testGroup(color=0xFF0000)
display.show(myGroup) # put the group on the display
print('This shows a 200x200 RED bitmap')
time.sleep(0.1)
time.sleep(2)

# Change the color to GREEN
myGroup.color=0x00FF00
print('The screen does not change')
time.sleep(0.1)
time.sleep(2)

# Change the color to BLUE
myGroup.color=0x0000FF
print('The screen does not change')
time.sleep(0.1)
time.sleep(2)

display.show(myGroup) # The screen changes to a 20x20 pixel BLUE bitmap
print('The screen changes to show a 20x20 blue square')

while True:
    pass