One example is better than a thousand words
Starting a new serie called Pygame by examples, to show a lot of simple but practical example of usage of pygame tools. In this example we will see how to “kill” a sprite some time after an action, like the key pressed.
The Enemy class
When we make an istance of the Enemy sprite we:
- We create a Surface (the sprite)
- color it (sieena1)
- crete the rect
- put the time to None
- the update method will check if the time is passed since the action took place
class Enemy(pg.sprite.Sprite):
def __init__(self, pos, *groups):
super().__init__(*groups)
self.image = pg.Surface((50, 30))
self.image.fill(pg.Color('sienna1'))
self.rect = self.image.get_rect(center=pos)
self.time = None
def update(self):
if self.time is not None: # If the timer has been started...
# and 500 ms have elapsed, kill the sprite.
if pg.time.get_ticks() - self.time >= 1500:
self.kill()
The main function
Here we create the window and set the clock. Create a group and the sprite (that will put the sprite in the group object that will be drawn into the while loop that follows.
In the while loop:
- we get eventual click on the “x” button of the window to close it
- get the keydown press and put the time to the actual value of ticks (to check how much time passes)
- update the group (all_sprites, but there is just one sprite)
- colors the screen… (to delete past images… unuseful at the moment when it’s all still)
- draws the group of all (1 for now) sprites
- update the screen with flip
def main():
screen = pg.display.set_mode((640, 480))
clock = pg.time.Clock()
all_sprites = pg.sprite.Group()
enemy = Enemy((320, 240), all_sprites)
done = False
while not done:
for event in pg.event.get():
if event.type == pg.QUIT:
done = True
elif event.type == pg.KEYDOWN:
# Start the timer by setting it to the current time.
enemy.time = pg.time.get_ticks()
all_sprites.update()
screen.fill((30, 30, 30))
all_sprites.draw(screen)
pg.display.flip()
clock.tick(30)
This is the window with the sprite. If you press a key, the sprite will be “killed”, aka destroyed and will disappear when the window is refreshed after 1500 frames.
Twitter: @pythonprogrammi - python_pygame
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