Hi
yes, python has a priority queue: heapq (standard module)
~DR0ID
Michael George schrieb:
In fact, now that I think about it for a few more minutes, it might
make sense to yield the time for the next update. Not sure if python
has a built-in priority queue class, but if so you could do something
like the following (pseudocode, sorry):
queue = new PQ()
queue.add(anim1_start_time, anim1)
queue.add(anim2_start_time, anim2)
while playing:
# handle events
while queue.next_time <= now:
a = queue.next()
try:
queue.add(a.next(), a)
except StopIteration:
pass
Then each animation method can sleep until a given time t by yielding t.
--Mike
Michael George wrote:
You might be able to restructure your code a little less if you use
generators to simulate coroutines. For example:
def anim1():
for frame in frames:
self.image = frame
yield
def anim2():
for i in range(10):
self.rect.move_ip(0, 10)
yield
anims = [anim1(), anim2()]
while playing:
# handle events
for a in anims:
a.next()
# update screen
I haven't actually used this technique in pygame so I don't know if
it's actually helpful here, but I think it's kind of a cool way of
simulating threads without threads. Anyone else have experience with
designing code this way?
--Mike
Casey Duncan wrote:
You will need a loop that continuously calls methods to update, draw
and refresh the screen. At the top of the loop you could check for
events to see if you need to do anything. Basically something like:
clock = pygame.time.Clock()
while playing:
for event in pygame.event.get():
handle_event(event)
sprites.update() # update all sprites, including ambient animation
dirty = sprites.draw(screen)
pygame.display.update(dirty)
pygame.display.flip() # May not be necessary depending on
display config
clock.tick(40) # Limit to 40 fps (set this to whatever you like)
You can also be kinder to the system by inserting a short
time.sleep() in there, but I'll leave that as an exercise for the
reader ;)
-Casey
On Sep 21, 2007, at 11:19 AM, Samuel Mankins wrote:
Hi.
Is there a way to pause one function, but to keep all the others
going? I'm building a 2D RPG, and my current animation function
uses pygame.time.wait(), which is good, but means I can't have
"ambient" animations (Things that move around randomly, like plants
waving in the wind), and I can only have on going at a time. Does
anyone know a way around this?
Thanks!