Hello,
Interesting example! :) You should schedule your loop_hook with the schedule
<http://python.cocos2d.org/doc/api/cocos.cocosnode.html#cocos.cocosnode.CocosNode.schedule>
method.
As it's schedule, you should not loop with a while in it, but just look in
a non-blocking way if there is a message. If not, just exit and let cocos
run until your function is scheduled again.
To change a label text, you need to access the the text attribute in
label.element.text. The cocos label is just a wrapper around the pyglet
label which is found under the element attribute.
Here is a working example where I use the Queue to wait until cocos is
ready to run before starting the label text changes.
For Windows users, you should really use the if __name__ == '__main__': guard,
otherwise the code won't run.
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from multiprocessing import Queue, Process
from queue import Empty
import time
def start_cocos(input_queue):
import cocos
class HelloWorld(cocos.layer.Layer):
def __init__(self):
super().__init__()
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)
self.schedule(self.check_queue)
def check_queue(self, dt):
try:
new_label_text = input_queue.get(block=False)
self.label.element.text = new_label_text
except Empty:
pass
cocos.director.director.init()
hello_layer = HelloWorld()
main_scene = cocos.scene.Scene(hello_layer)
input_queue.put("Ready!")
cocos.director.director.run(main_scene)
if __name__ == '__main__':
output_queue = Queue()
process = Process(target=start_cocos, kwargs=dict(
input_queue=output_queue,
))
process.start()
print("Process starts")
ready = output_queue.get(block=True)
print("Cocos is running")
time.sleep(2)
print("Change label name")
output_queue.put('New text for hello world')
time.sleep(2)
print("Change label name")
output_queue.put('New text again for hello world')
time.sleep(10)
print("End")
Regards,
Dan
Le dimanche 20 novembre 2016 17:54:26 UTC+1, Bastien Sevajol a écrit :
>
> Hello,
> I'm discovering cocos2d for python, my project have to create a cocos2d
> application inside a process and communicate with it with a Queue. I search
> a way to read this Queue in event loop.
> Some code to explain:
>
> from multiprocessing import Queue
> from multiprocessing import Process
> from queue import Empty
>
> import time
>
>
> def start_cocos(input_queue: Queue):
> import cocos
>
> class HelloWorld(cocos.layer.Layer):
> def __init__(self):
> super().__init__()
>
> label = cocos.text.Label(
> 'Hello, world',
> font_name='Times New Roman',
> font_size=32,
> anchor_x='center', anchor_y='center'
> )
> label.position = 320, 240
> self.add(label)
>
> cocos.director.director.init()
> hello_layer = HelloWorld()
> main_scene = cocos.scene.Scene(hello_layer)
>
> def loop_hook(director_or_scene_or_whatever):
> while True:
> try:
> new_label_text = input_queue.get(block=False, timeout=None
> )
> # ? Change label text ?
> except Empty:
> return # Finished to read Queue
>
> loop_hook(None)
>
> # ? Give to director loop_hook ?
> cocos.director.director.run(main_scene)
>
>
> output_queue = Queue()
> process = Process(target=start_cocos, kwargs=dict(
> input_queue=output_queue,
> ))
> process.start()
>
> time.sleep(2)
> output_queue.put('New text for hello world')
> time.sleep(2)
> output_queue.put('New text again for hello world')
> time.sleep(10)
>
> In this example code, i search to give to director or something else the
> loop_hook function. This loop_hook function should be executed a each loop
> iteration. And inside it's loop_hook, i should be able to modify label text
> value.
> Is it possible ?
>
> Regards,
> Bastien.
>
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