The code begins by importing the libraries.
import time import displayio from adafruit_circuitplayground import cp import adafruit_imageload from adafruit_gizmo import tft_gizmo from adafruit_display_shapes.circle import Circle
The TFT Gizmo's display is setup.
# setup for the Gizmo TFT display = tft_gizmo.TFT_Gizmo()
The background image and the crescent moon are imported using the adafruit_imageload library.
The crescent moon is a sprite sheet. This allows it to be split into a TileGrid and iterated through so that it appears to be animated.
The background of the crescent moon is black and is made transparent using the make_transparent() function. This lets the crescent moon shape appear by itself in front of the background image.
# loading the background image
bg_bitmap, bg_palette = adafruit_imageload.load("/clouds_bg.bmp",
bitmap=displayio.Bitmap,
palette=displayio.Palette)
bg_grid = displayio.TileGrid(bg_bitmap, pixel_shader=bg_palette)
# loading the crescent moon bitmap sequence
bitmap, palette = adafruit_imageload.load("/moon_anime.bmp",
bitmap=displayio.Bitmap,
palette=displayio.Palette)
# makes the black background transparent so we only see the cresent moon
palette.make_transparent(0)
tile_grid = displayio.TileGrid(bitmap, pixel_shader=palette, width = 1, height = 1,
tile_height = 120, tile_width = 120,
default_tile = 0)
The "jewel" in the center of the locket is made using the adafruit_display_shapes library to create two Circles that are layered.
# two circles for the center "jewel" jewel_outline = Circle(x0=120, y0=120, r=40, fill=0xfbf236) jewel = Circle(x0=120, y0=120, r=35, fill=0xf70570)
With three different graphical elements, a few groups are created to keep them organized. jewel_splash holds the two circles representing the jewel in the center of the display.
# adding the two jewel circle elements to a group jewel_splash = displayio.Group(max_size=20) jewel_splash.append(jewel_outline) jewel_splash.append(jewel)
moon_group holds the crescent moon sprite sheet and main_group acts as the group with all of the graphical elements.
# making a group for the crescent moon sequence # scale is 2 because at full 240x240 resolution image is too big moon_group = displayio.Group(scale = 2) # group to hold all of the display elements main_group = displayio.Group()
The order in which the graphics are added to the main_group matters. First, the background image is added, followed by the crescent moon and finally the jewel.
# adding the crescent moon tile grid to the moon group moon_group.append(tile_grid) # adding the background to the main group main_group.append(bg_grid) # adding the moon group to the main group main_group.append(moon_group) # adding the jewel circles to the main group main_group.append(jewel_splash) # showing the main group on the display display.root_group = main_group
A few state machines are setup. Their functions are commented in the code.
# tracks the tilegrid index location for the crescent moon moon = 0 # holds time.monotonic() crescent = 0 # a button debouncing a_pressed = False # b button debouncing b_pressed = False # tracks if music is playing music_playing = False # tracks if animation is paused animation_pause = False
The loop begins by debouncing the Circuit Playground Bluefruit's buttons.
while True:
# button debouncing
if not cp.button_a and a_pressed:
a_pressed = False
if not cp.button_b and b_pressed:
b_pressed = False
An if statement runs the crescent moon animation. Every .8 seconds, the tile_grid advances its index position, showing the next frame of the crescent moon's sprite sheet.
# runs crescent moon animation
if not music_playing and not animation_pause:
# every .8 seconds...
if (crescent + .8) < time.monotonic():
# the moon animation cycles
tile_grid[0] = moon
# moon is the tilegrid index location
moon += 1
# resets timer
crescent = time.monotonic()
# resets tilegrid index
if moon > 35:
moon = 0
The you press the A button on the Circuit Playground Bluefruit, the song will begin playing through the speaker.
if not music_playing and (cp.button_a and not a_pressed):
# music begins playing and will loop
music_playing = True
a_pressed = True
print("music playing")
# song plays once
cp.play_file("moonlight_densetsu.wav")
# music_playing state is updated
music_playing = False
If you want to pause the animation to admire the crescent moon, press the B button. The crescent moon will stop rotating.
# if the animation IS playing and you press the b button...
if not animation_pause and (cp.button_b and not b_pressed):
# the animation pauses by updating the animation_pause state
animation_pause = True
b_pressed = True
# debugging REPL message
print("animation paused")
To resume the animation, you can press the B button again and the crescent moon will continue its orbit right where it left off.
# if the animation is PAUSED and you press the b button...
if animation_pause and (cp.button_b and not b_pressed):
# the animation begins again by updating the animation_pause state
animation_pause = False
b_pressed = True
# debugging REPL message
print("animation running again")
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