Hi folks,
I'm continuing to work with Pyglet, and I'm getting results, but also
problems. Here is a simple application which I developed first on my
Ubuntu Linux 13.04 system, 64-bit version, AMD CPU, running Python 3.3.2
and pyglet 1.2alpha1. This is a "hello world" program, with Earth as a
bouncing ball in the background.
===================================================================
import pyglet
from random import uniform, choice
def random_velocity():
return [choice((-1,1)) * uniform(0.25,0.75) for x in range(2)]
class MyWindow(pyglet.window.Window):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.label = pyglet.text.Label(
'Hello, crazy world!',
font_name='Times New Roman',
font_size=40,
x = self.width//2, y = self.height//3,
anchor_x='center', anchor_y='center')
img = pyglet.resource.image('Earth 99x99.png')
self.sprite = pyglet.sprite.Sprite(
img,
x = (self.width - img.width)//2,
y = 2*self.height//3 - img.height//2)
self.sprite.vx, self.sprite.vy = random_velocity()
# Bounce boundaries
self.left = 5
self.right = self.width - img.width - 5
self.bottom = 5
self.top = self.height - img.height - 5
# Animation clock
pyglet.clock.schedule_interval(self.update, 1 / 60.0)
def on_draw(self):
self.clear()
self.sprite.draw()
self.label.draw()
def update(self, dt):
sp = self.sprite
sp.x += sp.vx
sp.y += sp.vy
if sp.x < self.left or sp.x > self.right:
sp.vx = -sp.vx
if sp.y < self.bottom or sp.y > self.top:
sp.vy = -sp.vy
sp.draw()
MyWindow()
pyglet.app.run()
===================================================================
It runs for a while, but then it hangs. The bouncing-ball Earth simply
stops moving. Attempting to use the mouse to close the Pyglet window
fails. The only way that I have found to close the window is to kill the
Python interpreter which is running it. CPU loading is light while the
animation is running, but drops to zero once the animation stops. It is as
if the Pyglet clock that I defined simply stopped ticking.
I added some timing features to the program (not shown) and ran it about a
dozen times. The program never crashed in less than 33 seconds, no matter
what else I was doing with the computer while it ran (switching to my IDE,
reading my web browser, etc.). Quite a few crashes occurred quite close to
that 33-second mark. The longest I got the program to run without crashing
was 229 seconds. And while I can't be sure of this, in a few instances it
appeared that the crashes were correlated with a mouse event. It looked
like the animation stopped right as I clicked into, or away from, my Pyglet
application window.
Out of curiosity, I tried my application on my Windows Vista virtual
machine, running under VirtualBox. It's only the 32-bit version of Vista,
but I am still using Python 3.3.2 and pyglet1.2alpha1. My program didn't
crash -- good! But it ran sluggishly, probably because I was generating a
huge and repeating list of OpenGL warnings. A quick Internet search
revealed that VirtualBox has some OpenGL bugs that are being fixed. This
suggested two things to me: 1) that Pyglet programs may have different
behaviors on different operating systems, and 2) that a VirtualBox might
not be the best place to investigate these problems.
So then I tried a Windows 7 system running directly on the hardware, not in
a virtual machine. I'm back to a 64-bit version of the OS here. But as
before, I have not changed any of the other variables. I stuck with Python
3.3.2 and pyglet1.2alpha1. My program didn't crash. I got no OpenGL
warning messages. Everything ran flawlessly for multiple runs, exceeding
10 minutes each.
So, I can't be certain that my program reveals a problem with Pyglet
itself. It may have something to do with something on which Pyglet depends
-- for example, the implementations of OpenGL on my various systems. How
would I know? Is there anything that I can address or repair? Any advice
is appreciated. Thanks!
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