Operation Manual

Experiments in Python
102
Notes:
def keyEvent(self, event):
# event should be key event but we only move
# if the key is pressed down and not released up
self.keydir = (0 if event.type == pygame.KEYUP else
-1 if event.key == pygame.K_LEFT else
+1 if event.key == pygame.K_RIGHT else 0)
# pygame library wants to do a few things before we can use it
pygame.init()
pygame.display.set_caption("Ski Slalom")
pygame.key.set_repeat(100, 5)
# create something to draw on with a size of 400 wide
canvas = pygame.display.set_mode([400, 500])
# we will need to have a constant time between frames
clock = pygame.time.Clock()
world = skiWorld()
# check input, change the game world and display the new game world
while (world.running):
# check external events (key presses, for instance)
for event in pyga me.event.get():
if event.type == pygame.QUIT: # stop running the game
world.running = False
elif (hasattr(event, 'key')): # process this keyboard input
world.keyEvent(event)
# update the game world
world.updateWorld()
# draw the world on the canvas
world.drawWorld(canvas)
# important to have a constant time between each display ip.
# in this case, wait until at least 1/30th second has passed
clock.tick(30)
# ip the display to show the newly drawn screen
pygame.display.ip()
# once the game is not running, need to nish up neatly
pygame.quit()