Python pong.

[X-13]

I've nearly made pong... I r teh best!

 

Just need to figure out enemy paddle AI [along with getting user_paddle stuff actually coded] and sort out a scoring system.

 

 

So, basically, I have a ball bouncing around on it's own. Go me!

[tmcd35]

 

So come on, lets see some code I actually haven't done much since the last post. I drew a stickman in paint and got Python to display him on screen - yay a sprite!!!

[X-13]

import sys, pygame
pygame.init()

size = width, height = 640, 480
speed = [2,2]
black = (0, 0, 0)
white = (255, 255, 255)
screen = pygame.display.set_mode(size)
ball = pygame.image.load("ball.bmp")
ballrect = ball.get_rect()
while 1:
   for event in pygame.event.get():
       if event.type == pygame.QUIT: sys.exit()
   ballrect = ballrect.move(speed)
   if ballrect.left < 0 or ballrect.right > width:
       speed[0] = -speed[0]
   if ballrect.top < 0 or ballrect.bottom > height:
       speed[1] = -speed[1]
   screen.fill(white)
   screen.blit(ball, ballrect)
   pygame.display.flip()

 

"ball.bmp" is a 20x20 black square saved in the same place as the script.

 

Even though I didn't code for it, it has the extra ability to crash on exit. [Window stops responding.]

 

I need to go back through it to make sure I fully understand what does what.

[tmcd35]

One thing I had drummed into me at college and uni was "comment everything", I still pretty poor at at it, but it does help when you go back and re-read a bit of code and bug finding. Especially when the code starts getting really long.

[X-13]

I generally do that, but just burned through this quick.

 

Hence the need to go back through it now... [i also just pinched a bit of your code "pygame.display.set_caption"]

 

Le EDIT: Just added some controls

 

esc/q to close it.plus, I pre-defined the up/down controls and space to start.

[X-13]

OK, I have half of the controls done. [Down works.]

 

if event.type == pygame.KEYDOWN:
   if event.key in (down_):
       ballrect = ballrect.move(speed)
       speed[0] = -speed[0]
   if event.key in (up_):
       ballrect = ballrect.move(speed)
       speed[0] = [sOMETHING]

 

What does [sOMETHING] need to be?

 

In other words, what's the opposite of -speed[0]? [it's not +speed[0]...]

[tmcd35]

speed = [2,2]
speed[0] = -speed[0]

 

Slightly confused by the choice of variable name. Are you controlling speed or direction? Is the value of speed x,y screen coordinates - or the rate of which the x,y cordinates are being changed by

 

ballrect.move(speed)

?

 

Also doesn't this line negate itself?

 

speed[0] = -speed[0]

 

So that after that line 'speed[0]' is always equal to '0'?

 

My gut instinct say the lines would probably read better...

 

if event.type == pygame.KEYDOWN:
   if event.key in (down_):
       speed[0] = speed[0] - 1
   if event.key in (up_):
       speed[0] = speed[0] + 1

ballrect = ballrect.move(speed)        

[X-13]

NAILED IT!

 

    # Paddle controls
   if event.type == pygame.KEYDOWN:
       if event.key in (down_):
           if paddlerect.bottom != game.bottom:
               paddlerect = paddlerect.move(0, y)
       if event.key in (up_):
           if paddlerect.top != game.top:
               paddlerect = paddlerect.move(0, -y)

 

 

I should point out, I renamed "speed" to "position" and position = (x, y)

Moves as smooth as butter and stops at the top/bottom.

[X-13]

Here you go, gents.

 

import sys
import pygame
pygame.init()
# Set global defaults
size = width, height = 640, 480
x = (1)
y = (1)
black = (0, 0, 0)
white = (255, 255, 255)
clock = pygame.time.Clock()
# Set display settings
screen = pygame.display.set_mode(size)
game = screen.get_rect()
pygame.display.set_caption ("Pong - Made by X-13")
# asset defaults
paddle = pygame.image.load("paddle.bmp")
paddlerect = paddle.get_rect()
paddlerect.centery = (height / 2)
ball = pygame.image.load("ball.bmp")
ballrect = ball.get_rect()

#controls
exit_ = pygame.K_ESCAPE, pygame.K_q
up_ = pygame.K_UP, pygame.K_w
down_ = pygame.K_DOWN, pygame.K_s
start_ = pygame.K_SPACE
# Main loop
while 1:
   # You need an exit strategy!
   for event in pygame.event.get():
       if event.type == pygame.QUIT: sys.exit()
       elif event.type == pygame.KEYDOWN:
           if event.key in (exit_):
               sys.exit(0)
   # Ball start location and behaviour
   ballrect.left = paddlerect.right
   ballrect.centery = paddlerect.centery
   # Paddle controls
   if event.type == pygame.KEYDOWN:
       if event.key in (down_):
           if paddlerect.bottom != game.bottom:
               paddlerect = paddlerect.move(0, y)
       if event.key in (up_):
           if paddlerect.top != game.top:
               paddlerect = paddlerect.move(0, -y)
   # Draw everything that needs to be seen
   screen.fill(white)
   screen.blit(paddle, paddlerect)
   screen.blit(ball, ballrect)
   pygame.display.flip()

 

This is where I'm up to only a few changes here and there. I'm currently working on the ball physics with a "press space to start" trigger [The one I had I didn't really understand, so I'm starting again.]

 

ATM, the ball sticks to the paddle as it moves. The plan is to get in position, press space then start playing.