Game Development Reference
In-Depth Information
First, let's recall how
Powerup#remove
method looks like:
class
Powerup
<
GameObject
# ...
def
remove
object_pool
.
powerup_respawn_queue
.
enqueue(
respawn_delay,
self
.
class, x, y)
mark_for_removal
end
# ...
end
Powerup enqueues itself for respawn when picked up, providing it's class and coordinates.
PowerupRespawnQueue
holds this data and respawns powerups at right time with help
of
ObjectPool
:
11-powerups/entities/powerups/powerup_respawn_queue.rb
1
class
PowerupRespawnQueue
2
RESPAWN_DELAY
= 1000
3
def
initialize
4
@respawn_queue
=
{}
5
@last_respawn
=
Gosu
.
milliseconds
6
end
7
8
def
enqueue
(delay_seconds, type, x, y)
9
respawn_at
=
Gosu
.
milliseconds
+
delay_seconds
* 1000
10
@respawn_queue
[
respawn_at
.
to_i
] = [
type, x, y
]
11
end
12
13
def
respawn
(object_pool)
14
now
=
Gosu
.
milliseconds
15
returnif
now
-
@last_respawn
<
RESPAWN_DELAY
16
@respawn_queue
.
keys
.
each
do
|
k
|
17
nextif
k
>
now
# not yet
18
type, x, y
=
@respawn_queue
.
delete(k)
19
type
.
new(object_pool, x, y)
20
end
21
@last_respawn
=
now
22
end
23
end
PowerupRespawnQeueue#respawn
is called from
ObjectPool#update_all
,
but is throttled to run once per second for better performance.
