Is there an easy way to use a background worker thread for the complex
calculations in cocos2d/pyglet? I would ideally like to do work off
the GUI thread, but I am not sure on how to do it.
I have an issue with frames missing in animations if I perform complex
calculations before triggering an animation. I'm currently running
this code on Mac OS X 10.6.5. Here's the basic structure of the
offending code.
1. Do complex calculation (~1 second to run)
2. Animate result
I'm expecting the calculation to finish before invoking the animation,
but that's not the case. It appears that the animation starts soon
after the complex calculation starts. After performing a complex
calculation the animation that follows will be missing frames of
animation. It may skip or stutter before resuming normal animation
speed.
Here's an example:
Key press = animation
Mouse press = calculation + animation
import sys
import os
sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
from time import time
import cocos
class HelloWorld(cocos.layer.Layer):
is_event_handler = True
def on_key_press (self, key, modifiers):
"""This function is called when a key is pressed.
'key' is a constant indicating which key was pressed.
'modifiers' is a bitwise or of several constants indicating
which
modifiers are active at the time of the press (ctrl,
shift, capslock, etc.)
"""
print "Key pressed:", key
#animate
self.label.do(cocos.actions.FadeIn(1) +
cocos.actions.RotateBy(360,1) +
cocos.actions.ScaleBy(2, 2) +
cocos.actions.ScaleBy(1/2.0, 1))
def calc(self):
print "Long Calc"
start = time()
for i in range(4000000):
j = i * 13743
end = time()
print "Total Calc Time", (end - start)
def on_mouse_press (self, x, y, buttons, modifiers):
"""This function is called when any mouse button is pressed
(x, y) are the physical coordinates of the mouse
'buttons' is a bitwise or of pyglet.window.mouse constants
LEFT, MIDDLE, RIGHT
'modifiers' is a bitwise or of pyglet.window.key modifier
constants
(values like 'SHIFT', 'OPTION', 'ALT')
"""
posX, posY = cocos.director.director.get_virtual_coordinates
(x, y)
print "Mouse Pressed: ", posX, ",", posY
# Do complex calculation that takes ~1 second to complete
self.calc()
#animate
self.label.do(cocos.actions.FadeIn(1) +
cocos.actions.RotateBy(360,1) +
cocos.actions.ScaleBy(2, 2) +
cocos.actions.ScaleBy(1/2.0, 1))
def __init__(self):
super( HelloWorld, self ).__init__()
# a cocos.text.Label is a wrapper of pyglet.text.Label
# with the benefit of being a cocosnode
self.label = cocos.text.Label('Hello, World!',
font_name='Times New Roman',
font_size=32,
anchor_x='center', anchor_y='center')
self.label.position = 320,240
self.add( self.label )
if __name__ == "__main__":
# director init takes the same arguments as pyglet.window
cocos.director.director.init()
hello_layer = HelloWorld ()
main_scene = cocos.scene.Scene (hello_layer)
cocos.director.director.run (main_scene)
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