implement self hidden property for vectorio shapes

[FoamyGuy]

This allows vectorio shapes to be hidden with a property on the objects. Previously the only way to hide them was by putting them into a Group and then hiding the Group. With these changes they can be hidden directly without a parent group.

I used this code for testing the new functionality:

import displayio
import vectorio
import board
from adafruit_display_shapes.circle import Circle
import time

display = board.DISPLAY
main_group = displayio.Group()

palette = displayio.Palette(1)
palette[0] = 0x125690

vec_circle = vectorio.Circle(pixel_shader=palette, radius=25, x=70, y=40)
main_group.append(vec_circle)

rectangle = vectorio.Rectangle(pixel_shader=palette, width=40, height=30, x=155, y=45)
main_group.append(rectangle)

circle = Circle(100, 100, 20, fill=0x00FF00, outline=0xFF00FF)
main_group.append(circle)

points=[(5, 5), (100, 20), (20, 20), (20, 100)]
polygon = vectorio.Polygon(pixel_shader=palette, points=points, x=0, y=0)
main_group.append(polygon)

display.show(main_group)
while True:
    circle.hidden = not circle.hidden
    vec_circle.hidden = not vec_circle.hidden
    rectangle.hidden = not rectangle.hidden
    polygon.hidden = not polygon.hidden
    #print(vec_circle.hidden)
    time.sleep(.5)

Tested the changes successfully on a Feather S2 TFT device.

[tannewt]

Thanks for adding this! One minor suggestion.

[tannewt]

Thank you!