The project is broken into 4 helper classes which are utilized by the code.py script rather than having all of the game logic exist directly inside of code.py. This helps make the code more understandable and allows for more easy re-use if you'd like to make your own version of the game with different features of functionality.
Entity
The Entity class is a super class that gets extended by both the Player and Ghost classes. You can think of Entity like a TileGrid that comes along with a few extra properties and functions that make it convenient for use in a game. In addition to having a TileGrid, it tracks the direction it's moving in, and holds a list of sprites with a next_sprite() function for iterating through them to create animations. The other helpful one is the is_colliding() function which allows you to test whether a given instance of Entity is colliding with a different instance of Entity. We'll use that to determine when the Player and Ghost touch each other.
class Entity:
"""
Entity helper class holds a TileGrid and keeps track of direction and a set of current sprites.
Includes functions for iterating through the sprites to make animations and
for checking on collissions with other Entities.
"""
# Direction Constants
DIRECTION_UP = 0
DIRECTION_RIGHT = 1
DIRECTION_LEFT = 2
DIRECTION_DOWN = 3
DIRECTION_NONE = 4
def __init__(
self,
bitmap: displayio.Bitmap,
pixel_shader: displayio.Palette,
width: int = 1,
height: int = 1,
tile_width: int = 15,
tile_height: int = 15,
default_tile: int = 0
):
# default direction is NONE subclasses can override it
self._direction = self.DIRECTION_NONE
# initialize the tilegrid for showing sprite(s)
self._tilegrid = displayio.TileGrid(
bitmap,
pixel_shader=pixel_shader,
width=width,
height=height,
tile_width=tile_width,
tile_height=tile_height,
default_tile=default_tile,
)
# keep property variables for size
self.width = tile_width * width
self.height = tile_height * height
# sprites for the animation (None by default, subclasses or game activity can change them)
self.current_sprites = []
self.sprite_index = 0
def next_sprite(self):
"""
Advance to the next sprite in the sequence for animation.
:return: None
"""
self.sprite_index += 1
if self.sprite_index >= len(self.current_sprites):
self.sprite_index = 0
self._tilegrid[0, 0] = self.current_sprites[self.sprite_index]
@property
def x(self):
"""
X pixel position of the tilegrid on the display
:return: int x location
"""
return self._tilegrid.x
@property
def y(self):
"""
Y pixel position of the tilegrid on the display
:return: int y location
"""
return self._tilegrid.y
@x.setter
def x(self, new_x):
self._tilegrid.x = new_x
@y.setter
def y(self, new_y):
# print("y setter")
self._tilegrid.y = new_y
@property
def tilegrid(self):
"""
The tilegrid used to show sprite(s)
:return: TileGrid
"""
return self._tilegrid
def is_colliding(self, _other_entity):
"""
Check if this entity is colliding with another entity.
:param _other_entity: another entity to check ourself against
:return: True if this instance is colidding with the _other_entity
"""
_colliding_x = False
_colliding_y = False
length_x = abs(self.x - _other_entity.x)
half_width_self = self.width / 2
half_width_other = _other_entity.width / 2
gap_between = length_x - half_width_self - half_width_other
if (gap_between > 0):
pass
elif (gap_between == 0):
pass
elif (gap_between < 0):
_colliding_x = True
length_y = abs(self.y - _other_entity.y)
half_height_self = self.height / 2
half_height_other = _other_entity.height / 2
gap_between = length_y - half_height_self - half_height_other
if (gap_between > 0):
pass
elif (gap_between == 0):
pass
elif (gap_between < 0):
_colliding_y = True
# print("colliding x: {} - y: {}".format(_colliding_x, _colliding_y))
return _colliding_x and _colliding_y
def game_tick(self, game_obj):
"""
Subclasses override this to add behavior to the entity.
:return:
"""
Player
The Player class extends Entity, so it gets all of the behavior, properties and functions from Entity and adds a few of it's own on top of those. Player handles changing to the appropriate sprites when the player changes directions. It also has a game_tick() which will get called on each iteration of the main game loop. Inside of game_tick() Player will handle moving in the current direction by one step. It will also call the next_sprite() function inherited from Entity when enough time has elapsed since the previous animation frame was drawn. Lastly, there is logic to teleport the player from one edge to the other once they reach the far left or right of the display.
class Player(Entity):
"""
Player helper class manages behavior and graphics for the player character.
"""
ANIMATION_DELAY = 200 # ms between chomp animation
MOVE_DELAY = 6 # ms between movement steps
RIGHT_SPRITES = (0, 5)
LEFT_SPRITES = (2, 7)
UP_SPRITES = (1, 6)
DOWN_SPRITES = (3, 8)
def __init__(self, bitmap: displayio.Bitmap, pixel_shader: displayio.Palette, *args, **kwargs):
super().__init__(bitmap, pixel_shader, *args, **kwargs)
# now = ticks_ms()
now = time.monotonic_ns() // 1000000
# initialize the movement and animation timestamps
self.last_animation_time = now
self.last_move_time = now
def game_tick(self, game_obj):
"""
Main behavior function for Player movement
:param game_obj: ChomperGame object for accessing variables and changing things
:return: True if the tick results in the display needing to be refreshed, otherwise False
"""
# now = ticks_ms()
now = time.monotonic_ns() // 1000000
# if it's been long enough since the last movement
if now > self.last_move_time + Player.MOVE_DELAY:
# update the last moved timestamp
self.last_move_time = now
# if it's been long enough since the last aninmation sprite frame
if self.last_animation_time + Player.ANIMATION_DELAY < now:
# change sprites
self.next_sprite()
# update animation timestmp
self.last_animation_time = now
if self.direction == Entity.DIRECTION_RIGHT:
# we're moving right, x location increases
self.x += 1
if self.direction == Entity.DIRECTION_LEFT:
# we're moving left, x location decreases
self.x -= 1
# if we made it to an edge, teleport to the other side
if self.x < 0 - self.width:
self.x = game_obj.display_size[0] // 3
elif self.x > game_obj.display_size[0] // 3:
self.x = 0
return True
return False
@property
def direction(self):
"""
whether the player is facing left or right
:return: either Entity.DIRECTION_LEFT or Entity.DIRECTION_RIGHT
"""
return self._direction
@direction.setter
def direction(self, new_direction):
"""
Update the direction of the player
:param new_direction: Entity.DIRECTION_LEFT or Entity.DIRECTION_Right
:return: None
"""
# update the sprites for chomp animation based on new direction
if new_direction == self.DIRECTION_RIGHT:
self.current_sprites = self.RIGHT_SPRITES
if new_direction == self.DIRECTION_LEFT:
self.current_sprites = self.LEFT_SPRITES
# update direction variable
self._direction = new_direction
Ghost
The Ghost class also extends Entity. It's structured the same as Player with a game_tick() function called each iteration of the main loop. The logic inside of Ghost's game_tick() function enables the following behaviors:
- Move the Ghost one step in the current direction.
- Keep track of whether the Ghost is currently edible for the Player or not.
- Turn to face the player so we chase them.
- If we are edible due to the Player eating a large pellet, then face away from them instead so that we run away.
- When the time comes, start the blinking animation to warn the player that the vulnerability window is nearly closed.
- Calling
next_sprite()to advance the animation frames at the appropriate intervals. - Change the Ghost back to the normal, more dangerous, mode when the vulnerability window runs out.
- When the Ghost has been eaten by the player change the sprite to its eyes only and fly them off of the screen
class Ghost(Entity):
"""
Ghost helper class manages behavior and graphics for the enemy ghost.
"""
# Time based variables
ANIMATION_DELAY = 100 # ms
MOVE_DELAY = 8 # ms
EDIBLE_DURATION = 2000 # ms
EDIBLE_WARNING_DURATION = 1000 # ms
# state machine state variables:
# normal ghost eats pacman and results in gameover
STATE_NORMAL = 0
# edible ghost can be eaten by pacman for points
STATE_EDIBLE = 1
# edible warning state blinks the ghost to warn player
STATE_EDIBLE_WARNING = 2
# after the ghost is eaten by pacman its eyes fly off the screen
STATE_DESPAWN_FLYOFF = 3
def __init__(self, bitmap: displayio.Bitmap, pixel_shader: displayio.Palette, *args, **kwargs):
"""
:param bitmap: sprite Bitmap object
:param pixel_shader: sprite palette
:param args: any other positional arguments to pass to parent class
:param kwargs: any other keyword arguments to pass to parent class
"""
super().__init__(bitmap, pixel_shader, *args, **kwargs)
# last time we moved
self.last_move_time = time.monotonic()
# whether we are edible
self._edible = False
# when we turned edible
self.turned_edible_at = None
# when we need to start blinking
self.edible_warn_time = None
# last time we blinked
self.last_animation_time = 0
# state machine current state
self.current_state = Ghost.STATE_NORMAL
@property
def edible(self):
"""
Whether the ghost is edible
:return: True if ghost is edible otherwise False
"""
return self._edible
@edible.setter
def edible(self, new_val):
# if ghost is becoming edible
if new_val:
# set the sprite to blue ghost
self.tilegrid[0, 0] = 18
# current timestamp
# now = ticks_ms()
now = time.monotonic_ns() // 1000000
# save timestampe we turned edible
self.turned_edible_at = now
# set the time we need to start blinking
self.edible_warn_time = now + (Ghost.EDIBLE_DURATION - Ghost.EDIBLE_WARNING_DURATION)
# if ghost is becoming non-edible
else:
# set the sprite to normal red ghost
self.tilegrid[0, 0] = 12
# clear out the turned edible at timestamp
self.turned_edible_at = None
# update the _edible boolean
self._edible = new_val
def game_tick(self, game_obj):
"""
Main behavior action function for the Ghost. Gets called by ChomperGame.game_tick().
Checks the current state and acts accordingly.
:param game_obj: The ChomperGame object to access variables and update things
:return: True if the action resulted in display needing to be refreshed, otherwise False
"""
# now = ticks_ms()
now = time.monotonic_ns() // 1000000
need_refresh = False
# Top level if statements to check current state within the state machine
# process movement for normal, edible, and blinking states
if self.current_state in (Ghost.STATE_NORMAL, Ghost.STATE_EDIBLE, Ghost.STATE_EDIBLE_WARNING):
# if it's been long enough since the last movement
if now > self.last_move_time + Ghost.MOVE_DELAY:
# update the last moved timestamp
self.last_move_time = now
# Check direction and prevent Ghost from moving thru the edges
if self.x < (game_obj.display_size[0] // 3) - 16 and self.direction == Entity.DIRECTION_RIGHT:
# we're moving right, increase x position
self.x += 1
if self.x > 0 and self.direction == Entity.DIRECTION_LEFT:
# we're moving left, decrease x position
self.x -= 1
need_refresh = True
# normal state ghost faces toward the player to chase them
if self.current_state == Ghost.STATE_NORMAL:
if self.x < game_obj.player_entity.x:
self.direction = Entity.DIRECTION_RIGHT
elif self.x > game_obj.player_entity.x:
self.direction = Entity.DIRECTION_LEFT
# edible and blinking faces away from the player to run away from them
elif self.current_state in (Ghost.STATE_EDIBLE, Ghost.STATE_EDIBLE_WARNING):
if self.x < game_obj.player_entity.x:
self.direction = Entity.DIRECTION_LEFT
else:
self.direction = Entity.DIRECTION_RIGHT
# edible state needs to determine when to blink
if self.current_state == Ghost.STATE_EDIBLE:
# if it's time to start warning blinks
if self.edible_warn_time and now > self.edible_warn_time:
# set sprites to blue and white ghosts for blinking
self.current_sprites = (19, 18)
# update the state machine current state variable
self.current_state = Ghost.STATE_EDIBLE_WARNING
# blinking state needs to animate sprites and determine
# when to go back to normal state
if self.current_state == Ghost.STATE_EDIBLE_WARNING:
# if it's time to change sprites for the animation
if now > self.last_animation_time + Ghost.ANIMATION_DELAY:
# change to next sprite in the animation
self.next_sprite()
# if it's time to go back to normal
if self.turned_edible_at and now > self.turned_edible_at + Ghost.EDIBLE_DURATION:
# update the sprite to normal red ghost
self.tilegrid[0, 0] = 12
# set edible property and state machine variable
self.edible = False
self.current_state = Ghost.STATE_NORMAL
# despawn flyoff state needs to fly the eyes off the screen
# and determine when to respawn the new ghost
if self.current_state == Ghost.STATE_DESPAWN_FLYOFF:
# if it's time to move the eyes
if now > self.last_move_time + Ghost.MOVE_DELAY:
self.last_move_time = now
# check direction and move. Stopping at the edge
if self.x < game_obj.display_size[0] // 3 and self.direction == Entity.DIRECTION_RIGHT:
self.x += 2
if self.x > 0 and self.direction == Entity.DIRECTION_LEFT:
self.x -= 2
# if we hit the edge, it's time to respawn a new Ghost
if self.x <= 0 or self.x >= game_obj.display_size[0] // 3:
# set the state to normal
self.current_state = Ghost.STATE_NORMAL
# clear out the warning timestamp
self.edible_warn_time = None
# set the sprite to normal red ghost
self.tilegrid[0, 0] = 12
# set edible property false for new ghost
self.edible = False
# spawn the new ghost at the edge furthest away from the player
spawn_left = game_obj.player_entity.x >= (game_obj.display_size[0] // 2) // 3
if spawn_left:
self.x = 0
else:
self.x = 21 * 15
return need_refresh
ChomperGame
If Player and Ghost are the puppets, then ChomperGame is the puppeteer. It makes use of the other helper classes and manages the entire game. ChomperGame has a game_tick() function too, within which it calls game_tick() on the Player and Ghost respectively as well as handling a few other aspects of the game.
ChomperGame extends displayio.Group, so it's ready to be set as the root_group of a display or added to another Group as needed. Because it's a Group it also supports the scale property, by default this game uses a scale of 3 so that the sprites can be relatively small on disk and in RAM, but then be drawn visibly larger on the display.
The ChomperGame class is responsible for the following:
- Initialize the background and map TileGrids, as well as the Player and Ghost objects.
-
spawn_pellets()function which fills the board with pellets. One big pellet at random and the rest small. - Initialize the text Labels for showing the score, multiplier, high score, and game over messages.
- Keep track of score and multiplier values, and update their text in the UI.
- Read the high score from NVM, show it in the UI and update when the player beats it.
- When the player moves onto a tile with a pellet, change the tile to empty and add to the score.
- When the player eats a big pellet, set the Ghost to edible.
- When all of the pellets in play have been eaten spawn a new batch of them and increase the multiplier.
- Check for collisions between the Player and Ghost and act according to whether the Ghost is currently edible.
- Show the Game Over text and pause all other activity when the Player touches the non-edible Ghost.
class ChomperGame(displayio.Group):
"""
Game helper class manages behavior and graphics for the entire game.
Extends displayio.Group so it can be shown on a display directly, or
added to another Group to be shown. Also supports Group scaling which
is used by default at scale=3.
"""
EMPTY_MAP_TILE = 17
PLAYER_TILE = 0
EASY_DIFFICULTY_THRESHOLD = 5
MEDIUM_DIFFICULTY_THRESHOLD = 10
HARD_DIFFICULTY_THRESHOLD = 20
VERYHARD_DIFFICULTY_THRESHOLD = 40
INSANE_DIFFICULTY_THRESHOLD = 80
def __init__(
self,
display_size,
):
super().__init__()
# variables for score and multiplier
self.score = 0
self.multiplier = 1
# display_size tuple referenced to know where the edges of the map are
self.display_size = display_size
# boolean for game over state
self.game_over = False
# Load the sprite sheet (bitmap)
self._sprite_sheet, self._palette = adafruit_imageload.load("1d_chomper_spritesheet.bmp")
# "green screen" transparent color
self._palette.make_transparent(0)
# sprites are 15px square
self._tile_width = 15
self._tile_height = 15
# Create the background TileGrid. It will be flat black
# with everything else drawn on top.
self._background_tilegrid = displayio.TileGrid(self._sprite_sheet, pixel_shader=self._palette,
width=21,
height=3,
tile_width=self._tile_width,
tile_height=self._tile_height,
default_tile=ChomperGame.EMPTY_MAP_TILE)
# Create the map TileGrid. It will contain the blue line walls, pellets, and empty tiles
self._map_tilegrid = displayio.TileGrid(self._sprite_sheet, pixel_shader=self._palette,
width=21,
height=3,
tile_width=self._tile_width,
tile_height=self._tile_height,
default_tile=ChomperGame.EMPTY_MAP_TILE)
self._map_tilegrid.x = 2
self._map_tilegrid.y = 12
# spawn the top and bottom wall tiles
for i in range(21):
self._map_tilegrid[i, 0] = 13
self._map_tilegrid[i, 2] = 13
# create the pellets and keep a variable to count them
self.spawn_pellets()
self.pellets_in_play = 21
# create player object
self._player_entity = Player(
self._sprite_sheet, pixel_shader=self._palette,
width=1,
height=1,
tile_width=self._tile_width,
tile_height=self._tile_height,
default_tile=ChomperGame.PLAYER_TILE
)
self._player_entity.y = 12 + 15
# add tilegrids to self Group instance
self.append(self._background_tilegrid)
self.append(self._map_tilegrid)
self.append(self._player_entity.tilegrid)
# create the ghost object
ghost = Ghost(self._sprite_sheet, self._palette, default_tile=12)
ghost.direction = Entity.DIRECTION_LEFT
ghost.x = 21 * 15
ghost.y = 12 + 15
self.append(ghost.tilegrid)
self.ghost = ghost
# create labels for score, multiplier, highscore and gameover
# Score label, top left
self.score_lbl = Label(terminalio.FONT, text="Score:")
self.score_lbl.anchor_point = (0, 0)
self.score_lbl.anchored_position = (1, 1)
self.append(self.score_lbl)
# Score Value, top left
self.score_value_lbl = Label(terminalio.FONT, text="0")
self.score_value_lbl.anchor_point = (0, 0)
self.score_value_lbl.anchored_position = (40, 1)
self.append(self.score_value_lbl)
# Multiplier label, top middle
self.multiplier_lbl = Label(terminalio.FONT, text="x")
self.multiplier_lbl.anchor_point = (0, 0)
self.multiplier_lbl.anchored_position = (110, 1)
self.append(self.multiplier_lbl)
# Multiplier value, top middle
self.multiplier_value_lbl = Label(terminalio.FONT, text="0")
self.multiplier_value_lbl.anchor_point = (0, 0)
self.multiplier_value_lbl.anchored_position = (118, 1)
self.append(self.multiplier_value_lbl)
# Gameover, bottom middle
self.gameover_lbl = Label(terminalio.FONT, text="Game Over")
self.gameover_lbl.anchor_point = (0.5, 1.0)
self.gameover_lbl.anchored_position = ((self.display_size[0] // 2) // 3, self.display_size[1] // 3 - 5)
# Highscore, top right.
# Doesn't need separate label and value because it doesn't update during the game loop
self.highscore_value_lbl = Label(terminalio.FONT, text="HI: 100")
self.highscore_value_lbl.anchor_point = (1.0, 0)
self.highscore_value_lbl.anchored_position = ((self.display_size[0] // 3) - 4, 1)
self.append(self.highscore_value_lbl)
self.highscore = 0
try:
# read data from NVM storage
read_data = nvm_helper.read_data()
# if we found data check if it's a highscore value
if type(read_data) == list and read_data[0] == "1dc_hs":
# it is a highscore so populate the label with its value
self.highscore_value_lbl.text = f"HI: {read_data[1]}"
self.highscore = read_data[1]
except EOFError:
# No saved Highscore
pass
def update_score(self):
"""
Update the score and multiplier value labels with teir current values
:return: None
"""
self.score_value_lbl.text = str(self.score)
self.multiplier_value_lbl.text = str(self.multiplier)
def change_map_tile(self, tile_coords, new_tile_index):
"""
Change a tile on the map to a different type
:param tile_coords: Tuple (x, y) of coordinates in the map tilegrid to change
:param new_tile_index: int new tile index value to set at the specified location
:return: None
"""
self._map_tilegrid[tile_coords[0], tile_coords[1]] = new_tile_index
@property
def player_entity(self):
"""
The player entity helper object
:return: Player object
"""
return self._player_entity
def spawn_pellets(self):
"""
Fill the center row of the map with pellets. One is randomly
chosen to be a big pellet instead of small.
:return: None
"""
# random choice for big pellet
big_pellet_loc = random.randint(0, 20)
# loop over tiles
for i in range(21):
if big_pellet_loc == i:
# set the big pellet in its chosen location
self._map_tilegrid[i, 1] = 9
else:
# set small pellets everywhere else
self._map_tilegrid[i, 1] = 4
# reset the pellet counter variable
self.pellets_in_play = 21
def game_tick(self):
"""
Main "heartbeat" function of the game. This will get called over and over from the
main code.py file. game_tick() is responsible for carrying out all game logic and
updating visible components.
:return: None
"""
# if the game is over just return so nothing else happens.
# game is effectively paused during game over, waiting on
# the player to start a new game.
if self.game_over:
return
# print(ticks_ms())
# player takes action
self.player_entity.game_tick(self)
# player location in tile coordinate space
if self.player_entity.direction == Entity.DIRECTION_LEFT:
current_coords = (self.player_entity.x // 15, 1)
elif self.player_entity.direction == Entity.DIRECTION_RIGHT:
current_coords = ((self.player_entity.x + 1) // 15, 1)
try:
# check the tile type at the player's location
current_tile_type = self._map_tilegrid[current_coords]
except IndexError:
# player is teleporting between sides right now
current_tile_type = ChomperGame.EMPTY_MAP_TILE
# if it's a pellet
if current_tile_type in (4, 9): # pellet, big pellet
# remove the pellet, set the tile to empty
self.change_map_tile(current_coords, ChomperGame.EMPTY_MAP_TILE)
# add points to score
self.score += 1 * self.multiplier
# subtract a pellet from the count variable
self.pellets_in_play -= 1
# if the last pellet was eaten
if self.pellets_in_play == 0:
# make new pellets
self.spawn_pellets()
# add 1 to the multiplier
self.multiplier += 1
# increase difficulty if we reached a threshold
if self.multiplier == ChomperGame.EASY_DIFFICULTY_THRESHOLD:
self.ghost.MOVE_DELAY -= 1
if self.multiplier == ChomperGame.MEDIUM_DIFFICULTY_THRESHOLD:
self.ghost.MOVE_DELAY -= 1
if self.multiplier == ChomperGame.HARD_DIFFICULTY_THRESHOLD:
self.ghost.MOVE_DELAY -= 1
self.player_entity.MOVE_DELAY -= 1
if self.multiplier == ChomperGame.VERYHARD_DIFFICULTY_THRESHOLD:
self.ghost.MOVE_DELAY -= 1
if self.multiplier == ChomperGame.INSANE_DIFFICULTY_THRESHOLD:
self.ghost.MOVE_DELAY -= 1
# update the score labels in the UI
self.update_score()
# if it was a big pellet
if current_tile_type == 9:
# if the ghost is currently normal state, it becomes edible
if self.ghost.current_state in (Ghost.STATE_NORMAL, Ghost.STATE_EDIBLE, Ghost.STATE_EDIBLE_WARNING):
# set the state and edible property
self.ghost.current_state = Ghost.STATE_EDIBLE
self.ghost.edible = True
# ghost takes action
self.ghost.game_tick(self)
# if the player is touching the ghost and the ghost isn't currently flying off to despawn
if self.player_entity.is_colliding(self.ghost) \
and not self.ghost.current_state == Ghost.STATE_DESPAWN_FLYOFF:
# if the ghost is in normal state, non-edible
if not self.ghost.edible:
# set the gameover boolean
self.game_over = True
# show the gameover text at bottom middle of display
self.append(self.gameover_lbl)
# if the score is greater than the previous highscore
if self.score > self.highscore:
# save new high score value to NVM storage
nvm_helper.save_data(("1dc_hs", self.score), test_run=False)
# update the highscore variable for comparison after the next game
self.highscore = self.score
# update the highscore text in the UI
self.highscore_value_lbl.text = f"HI: {self.highscore}"
# sleep a bit to ignore any btn presses that were intended for turning,
# not starting next game.
time.sleep(0.5)
else: # ghost is edible, nomnomnom
# set the ghost state to despawn flyoff
self.ghost.current_state = Ghost.STATE_DESPAWN_FLYOFF
# change ghost's direction
self.ghost.direction = Entity.DIRECTION_LEFT if self.ghost.direction == Entity.DIRECTION_RIGHT else Entity.DIRECTION_RIGHT
# set the ghost sprite to eyes only
self.ghost.tilegrid[0, 0] = 23
# add points to player's score
self.score += 2 * self.multiplier
# if there are no big pellets on the map
if not self.big_pellet_exists():
# convert one small pellet to a big one
self.convert_pellet_to_big()
def convert_pellet_to_big(self):
"""
Convert a random existing small pellet to a big one
:return: None
"""
# check which pellets are currently up
pellet_locs = self.find_pellets()
# choose a random one of them
chosen_pellet = random.choice(pellet_locs)
# update it's sprite to big pellet
self._map_tilegrid[chosen_pellet, 1] = 9
def big_pellet_exists(self):
"""
Check if any big pellets exist
:return: True if there is at least one big pellet on the map
"""
for i in range(21):
if self._map_tilegrid[i, 1] == 9:
return True
def find_pellets(self):
"""
Find all pellet locations
:return: List of x location indexes containing small pellets
"""
pellet_locs = []
for i in range(21):
if self._map_tilegrid[i, 1] == 4:
pellet_locs.append(i)
return pellet_locs
def restart(self):
"""
Reset everything and start a new game
:return: None
"""
# move player to the left side
self.player_entity.x = 15
# move ghost to the right side
self.ghost.x = ((self.display_size[0] // 4) * 3) // 3
# respawn pellets
self.spawn_pellets()
# set game_over to False
self.game_over = False
# reset score and multiplier
self.score = 0
self.multiplier = 1
# update score and multiplier in the UI
self.update_score()
# remove the gameover text
self.remove(self.gameover_lbl)
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