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Re: Pygame mouse cursor load/unload

References <d6374016-8863-4e8b-9ec9-17a826ca2eee@googlegroups.com> <9c352284-08c4-439e-b324-caffa3718429@googlegroups.com>
From Ian Kelly <ian.g.kelly@gmail.com>
Date 2013-03-03 16:47 -0700
Subject Re: Pygame mouse cursor load/unload
Newsgroups comp.lang.python
Message-ID <mailman.2828.1362354471.2939.python-list@python.org> (permalink)

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On Sun, Mar 3, 2013 at 3:09 PM, Alex Gardner <agardner210@gmail.com> wrote:
>     if (0,0) <= paddle_pos <= (300,300):

This doesn't do what you think it does.  Tuples are compared
lexicographically, not element-wise.  So (250, 350) < (300, 300), but
(350, 250) > (300, 300).

>          paddle_pos = pygame.mouse.get_pos()
>          screen.blit(beeper, paddle_pos)
>          pygame.display.update()
>          clock.tick(50)

You're updating paddle_pos inside the if block.  Once paddle_pos falls
outside that range, the if block won't trigger, and paddle_pos will no
longer be updated, so it will never fall inside that range again.

pygame has a Rect class for rectangle logic that can solve both of
these problems for you.  Given:

paddle_rect = beeper.get_rect()
bounds_rect = pygame.Rect(0, 0, 300, 300)

your position update code then becomes:

paddle_rect.center = pygame.mouse.get_pos()
paddle_rect.clamp_ip(bounds_rect)

Note that paddle_rect can replace paddle_pos entirely.  The code:

screen.blit(beeper, paddle_pos)

simply becomes:

screen.blit(beeper, paddle_rect)

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Thread

Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-02 17:56 -0800
  Re: Pygame mouse cursor load/unload Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-02 20:08 -0700
    Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-02 19:52 -0800
    Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-02 19:52 -0800
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-03 14:04 -0800
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-03 14:09 -0800
    Re: Pygame mouse cursor load/unload Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-03 16:47 -0700
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-09 16:20 -0800
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-09 16:25 -0800
    Re: Pygame mouse cursor load/unload Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-10 13:23 -0600
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-10 15:25 -0700
    Re: Pygame mouse cursor load/unload Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-10 19:26 -0600
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-11 09:57 -0700
    Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-11 10:00 -0700
      Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-11 10:04 -0700
      Re: Pygame mouse cursor load/unload Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-11 11:24 -0600
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-11 10:33 -0700
    Re: Pygame mouse cursor load/unload Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-11 12:01 -0600
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-11 13:43 -0700
    Re: Pygame mouse cursor load/unload MRAB <python@mrabarnett.plus.com> - 2013-03-11 20:54 +0000
    Re: Pygame mouse cursor load/unload Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-11 15:23 -0600
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-12 16:33 -0700
    Re: Pygame mouse cursor load/unload Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-12 21:00 -0600
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-14 15:16 -0700
    Re: Pygame mouse cursor load/unload Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-14 16:31 -0600
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-14 15:56 -0700
  Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-18 13:24 -0700
    Re: Pygame mouse cursor load/unload Alex Gardner <agardner210@gmail.com> - 2013-03-18 16:05 -0700

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