Python self learning

[hdanap]

Hi people,

in my self study im doing, not assignment fro school but and exercise in a pyhton book, the question are.



Copy catch.py to pong1.py and change the ball into a paddle by using Box instead of the Circle. You can look at Appendix A for more information on Box. Make the adjustments needed to keep the paddle on the screen.
Copy pong1.py to pong2.py. Replace the distance function with a boolean function hit(bx, by, r, px, py, h) that returns True when the vertical coordinate of the ball (by) is between the bottom and top of the paddle, and the horizontal location of the ball (bx) is less than or equal to the radius (r) away from the front of the paddle. Use hit to determine when the ball hits the paddle, and make the ball bounce back in the opposite horizontal direction when hit returns True. Your completed function should pass these doctests:
def hit(bx, by, r, px, py, h):
"""
>>> hit(760, 100, 10, 780, 100, 100)
False
>>> hit(770, 100, 10, 780, 100, 100)
True
>>> hit(770, 200, 10, 780, 100, 100)
True
>>> hit(770, 210, 10, 780, 100, 100)
False
"""


3. Finally, change the scoring logic to give the player a point when the ball goes off the screen on the left.

======================================

I have figured out everything but i kinda think i cheated in the code i wrote up for the 1st question, the part that instructs keeping the paddle on the screen, mayb im right but i feel there should be a better way to keep the paddle on screen

This is my code for the exercise:




from gasp import *

COMPUTER_WINS = 1
PLAYER_WINS = 0
QUIT = -1

def distance(x1, y1, x2, y2):
return ((x2 - x1)**2 + (y2 - y1)**2)**0.5


def hit(bx, by, r, px, py, h):
"""
>>> hit(760, 100, 10, 780, 100, 100)
False
>>> hit(770, 100, 10, 780, 100, 100)
True
>>> hit(770, 200, 10, 780, 100, 100)
True
>>> hit(770, 210, 10, 780, 100, 100)
False
"""
if px - bx <= r and by >= py and by <= (py + h):
return True
else:
return False






def play_round():
# the ball
ball_x = 10
ball_y = 300
ball = Circle((ball_x, ball_y), 10, filled=True, color=color.BLACK)
dx = 4
dy = random_between(-5, 5)

#paddle
mitt_x = 780
mitt_y = random_between(20, 290)
r = 20
h = 100
#paddle
mitt = Box((mitt_x, mitt_y), r, h)




while True:
if ball_y > 590 or ball_y < 10:
dy *= -1
ball_y += dy
if ball_x > 810:
remove_from_screen(ball)
remove_from_screen(mitt)
return COMPUTER_WINS
ball_x += dx

move_to(ball, (ball_x, ball_y))

if key_pressed('k') and mitt_y <= 580:
mitt_y += 5
elif key_pressed('j') and mitt_y >= 20:
mitt_y += -5
else:
if key_pressed('o'):
return QUIT

move_to(mitt, (mitt_x, mitt_y))


# makes the ball bounce back
if hit(ball_x, ball_y, r, mitt_x, mitt_y, h):
dx *= -1

# new scoring logic
if ball_x < 10:
remove_from_screen(ball)
remove_from_screen(mitt)
return PLAYER_WINS

update_when('next_tick')


def play_game():
player_score = 0
computer_score = 0

while True:
pmsg = Text('Player: %d Points' % player_score, (10, 570), size = 24)
cmsg = Text('Computer: %d Points' % computer_score, (640, 570), size = 24)

# this is the part i think i cheated, keeping the paddle on screen
# I think, i should be keeping the paddle on screen in function play_round at the
# top, but cant seem to do that, is the code right? or is ther something im missing

mitt_x = 780
mitt_y = random_between(20, 290)
r = 20
h = 100
#paddle
mitt = Box((mitt_x, mitt_y), r, h)
move_to(mitt, (mitt_x, mitt_y))
sleep(3)
remove_from_screen(pmsg)
remove_from_screen(cmsg)
remove_from_screen(mitt)


result = play_round()

if result == PLAYER_WINS:
player_score +=1
elif result == COMPUTER_WINS:
computer_score += 1
else:
return QUIT

if player_score == 5:
return PLAYER_WINS
elif computer_score == 5:
return COMPUTER_WINS


begin_graphics(800, 600, title='Catch', background=color.YELLOW)

result = play_game()

if result == PLAYER_WINS:
Text('Player Wins!', (390, 290), size = 24)
else:
Text('Computer Wins!', (390, 290), size = 24)

sleep(5)
end_graphics()





if __name__ == '__main__':
import doctest
doctest.testmod()

[Vaphell]

when you post snippets of code, put it in [code] tags because python requires precise indentation which is not preserved when pasting code into the message body directly.

[hdanap]

when you post snippets of code, put it in [code] tags because python requires precise indentation which is not preserved when pasting code into the message body directly.


Hi, i always wondered how i could make it look correct, pls can u dirrect me on how to use code tags, not familiar with it

thanks

[juancarlospaco]

[code ]
import antigravity
print ('Bazinga!')
[/code ]