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"""
Dodge game
Get the player back and forth across the screen while dodging the enemy
"""
from microbit import *
import music
class Enemy:
"""
Enemy which moves vertically down the screen
"""
def __init__(self):
self.x, self.y = 2, -1
def get_positions(self):
return ((self.x, self.y), (self.x, self.y + 1 if self.y < 4 else 0))
def move(self):
# Rotate back round to the top
self.y = (self.y + 1) % 5
def draw(self):
for x, y in self.get_positions():
display.set_pixel(x, y, 9)
class Player:
"""
Left-right moving player which can be controlled with buttons
"""
RIGHT = 1
LEFT = -1
STOPPED = 0
LEFT_EDGE = 0
RIGHT_EDGE = 4
def __init__(self):
self.alive = True
self.score = 0
self.just_scored = False
self.x, self.y = self.LEFT_EDGE, 2
self.direction = self.STOPPED
def get_position(self):
return (self.x, self.y)
def die(self):
"""
Player dies - show their score and play sad music
"""
self.alive = False
display.show(str(self.score))
music.play(music.WAWAWAWAA)
def move(self):
"""
Move the player one step further in their
current direction
"""
self.just_scored = False
self.x += self.direction
if self.x in (self.LEFT_EDGE, self.RIGHT_EDGE):
# Player reached the edge - another run survived!
if self.direction != self.STOPPED:
self.score += 1
self.just_scored = True
self.direction = self.STOPPED
def draw(self):
"""
Draw the player
"""
display.set_pixel(self.x, self.y, 9)
if self.just_scored:
music.pitch(400, 40)
def act_on_input(self):
# If we're standing still, look for a button press.
if self.direction == self.STOPPED:
if button_b.was_pressed() and self.x == self.LEFT_EDGE:
self.direction = self.RIGHT
elif button_a.was_pressed() and self.x == self.RIGHT_EDGE:
self.direction = self.LEFT
class Game:
def __init__(self):
self.enemy = Enemy()
self.player = Player()
self.frame_rate = 1
def detect_collisions(self):
"""
Have the player and the enemy collided?
"""
return self.player.get_position() in self.enemy.get_positions()
def do_frame(self):
"""
Called once per frame to advance the game state
"""
# Adjust the speed as the player's score gets higher
# (But don't let it exceed the actual frame rate)
self.frame_rate = max(1, min(100, self.player.score))
if self.player.alive:
display.clear()
self.enemy.move()
self.player.act_on_input()
self.player.move()
if self.detect_collisions():
self.player.die()
else:
self.enemy.draw()
self.player.draw()
game = Game()
while True:
timestamp = running_time()
game.do_frame()
# Keep the frame rate consistent
new_timestamp = running_time()
time_taken = (new_timestamp - timestamp)
interval = 1000 // game.frame_rate
if time_taken < interval:
sleep(interval - time_taken)
timestamp = new_timestamp
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