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Message from discussion Explicit event to redraw a window
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Nathan  
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 More options Jul 23 2012, 1:03 pm
From: Nathan <nathan.sto...@gmail.com>
Date: Mon, 23 Jul 2012 11:03:53 -0600
Local: Mon, Jul 23 2012 1:03 pm
Subject: Re: Explicit event to redraw a window
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On Mon, Jul 23, 2012 at 10:53 AM, anatoly techtonik <techto...@gmail.com> wrote:
> On Mon, Jul 23, 2012 at 7:27 PM, Nathan <nathan.sto...@gmail.com> wrote:
>> On Mon, Jul 23, 2012 at 4:46 AM, anatoly techtonik <techto...@gmail.com> wrote:
>>> Hi,

>>> What is the correct way to initiate window redraw?

>> If I understand correctly (correct me if I'm wrong, people), every
>> Window's on_draw() function is called once each time the event "idle"
>> loop runs.

> I've started with Hello World, and on Linux this means its window is
> redrawn only once on startup and then each time a key is pressed.

That doesn't sound right.  Can you post the entire hello world source
code you have?

> http://www.pyglet.org/doc/programming_guide/hello_world.html

>> You could:

>> 1) Call the window's on_draw() method manually if you want it called
>> _more_ often.

> If I place this into on_draw() it will create call stack overflow and
> "Hello, World" will crash.

Well, right, you shouldn't call it from within itself.  It'll just
recurse until it crashes if you do that.  I meant you could call it
from pretty much any other code that happens to be running during a
loop.  But it sounds like there's something wrong with your basic
Hello World example, so I don't think you're looking for this level of
a solution.

>> 2) Override the default idle policy of the event loop by subclassing
>> it if you don't want it called exactly once per window per event loop.
>>  See [a].

>> [a] http://www.pyglet.org/doc/programming_guide/customising_the_event_loo...

> Sounds complicated. It will be enough for me to send some event at the
> end of on_draw to kick the loop again. I don't know how to do this
> properly. Sending keyboard events doesn't sound right.

Right.  Lets get the basic hello world working for you.

~ Nathan


 
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