Teaching Kids Programming: Videos on Data Structures and Algorithms
We have actually developed and designed the Apple Catching/Eating Game on Microbit using Javascript: Microbit Programming: How to Make a Catching-Apple Game by Using Sprites Objects?
Today, we are going to use the Python to re-implement the Game on Microbit. Actually we can switch the programming language between Javascript and Python, and the code will be automatically translated to one and another.
Microbit Game Programming: Catch and Eat Apples (Python)
We need to create two sprites (objects): Apple and bowl. Then on main game loop, we let the apple fall one pixel down. Meantime we control the delay (higher score, less delay, faster falling speed). If we catch the apple (we can check this by sprite.is_touching method), we increment the score and move apple back to the top (first row). Otherwise, if the apple is on the last row (on the ground), we trigger the game-over procedure.
Full source code in Python for Microbit Game： Catch and Eat Apples:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | # Apple Catching Game Made by Love # Teaching Kids Programming # 2022-2-17 # move bowl one pixel to the left # wrap to right if go beyond the left boundary e.g x=0 then x=4 def moveLeft(): if not game.is_running(): return if bowl.x() == 0: bowl.set_x(4) return bowl.move(-1) input.on_button_pressed(Button.A, moveLeft) # game over: show score, pause and display game over def gameOver(): if not game.is_running(): return basic.show_number(game.score()) basic.pause(2000) game.game_over() # start a new game # triggered only when apple is on the ground # clear score, reset apple position def resetGame(): if apple.y() != 4: return game.set_score(0) apple.set_x(randint(0, 4)) apple.set_y(0) game.resume() # A+B button reset the game when apple is on the ground input.on_button_pressed(Button.AB, resetGame) # move bowl one pixel to the right and # wrap to left if beyond the boundary e.g. x=4 then x=0 def moveRight(): if bowl.x() == 4: bowl.set_x(0) return bowl.move(1) input.on_button_pressed(Button.B, moveRight) # higher score, less delay, faster apple falling speed def getCurrentDelay(score: number): delay = 500 - 10 * score # min delay is 50ms delay = max(50, delay) return delay apple = game.create_sprite(randint(0, 4), 0) bowl = game.create_sprite(2, 4) def on_forever(): if not game.is_running(): return # apple should be falling basic.pause(getCurrentDelay(game.score())) # falling one pixel at a time apple.change_yby(1) # we've got the apple if bowl.is_touching(apple): # score += 1 game.set_score(game.score() + 1) # move apple back to top with a random x apple.go_to(randint(0, 4), 0) return # apple is on the ground if apple.y() == 4: gameOver() return # driver - main game loop basic.forever(on_forever) |
# Apple Catching Game Made by Love
# Teaching Kids Programming
# 2022-2-17
# move bowl one pixel to the left
# wrap to right if go beyond the left boundary e.g x=0 then x=4
def moveLeft():
if not game.is_running():
return
if bowl.x() == 0:
bowl.set_x(4)
return
bowl.move(-1)
input.on_button_pressed(Button.A, moveLeft)
# game over: show score, pause and display game over
def gameOver():
if not game.is_running():
return
basic.show_number(game.score())
basic.pause(2000)
game.game_over()
# start a new game
# triggered only when apple is on the ground
# clear score, reset apple position
def resetGame():
if apple.y() != 4:
return
game.set_score(0)
apple.set_x(randint(0, 4))
apple.set_y(0)
game.resume()
# A+B button reset the game when apple is on the ground
input.on_button_pressed(Button.AB, resetGame)
# move bowl one pixel to the right and
# wrap to left if beyond the boundary e.g. x=4 then x=0
def moveRight():
if bowl.x() == 4:
bowl.set_x(0)
return
bowl.move(1)
input.on_button_pressed(Button.B, moveRight)
# higher score, less delay, faster apple falling speed
def getCurrentDelay(score: number):
delay = 500 - 10 * score
# min delay is 50ms
delay = max(50, delay)
return delay
apple = game.create_sprite(randint(0, 4), 0)
bowl = game.create_sprite(2, 4)
def on_forever():
if not game.is_running():
return
# apple should be falling
basic.pause(getCurrentDelay(game.score()))
# falling one pixel at a time
apple.change_yby(1)
# we've got the apple
if bowl.is_touching(apple):
# score += 1
game.set_score(game.score() + 1)
# move apple back to top with a random x
apple.go_to(randint(0, 4), 0)
return
# apple is on the ground
if apple.y() == 4:
gameOver()
return
# driver - main game loop
basic.forever(on_forever)Tomorrow, we’ll enlighten the computer with AI to play this game nicely using Simple Decision Tree aka Decision Rules: Teaching Kids Programming – Simple AI Algorithm of Decision Rules/Trees in Microbit Apple Catching Game
–EOF (The Ultimate Computing & Technology Blog) —
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