[mac os] Sketchpads on Legacy don't work anymore

Comments

• sebastiaan

  June 2017

  Hi,

  I suspect it's this issue. Essentially, in some cases on Mac OS, the display isn't refreshed unless there is also some form of keyboard interaction. Flushing the keyboard is sufficient.

  Is that what you're seeing as well? I.e. a sketchpad that is followed by a sleep and then another sketchpad is not shown. But a sketchpad that is followed by a keyboard_response is shown. Correct?

  Cheers,
  Sebastiaan

  
  
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• Pad

  June 2017 edited June 2017

  Hi @sebastiaan,
  Correct.

  I also replicated your github bug
  This also work btw :

  c = canvas()
  my_mouse = mouse()
  
  for i in range(5):
      c.clear()
      c.text(str(i))
      c.show()
      my_mouse.get_click(timeout=5)
      clock.sleep(1000)
  

  Any tip to make the sketchpads appear without having to replace them for inline_scripts ?
• sebastiaan

  June 2017

  Hi,

  Below is a script that wraps the original canvas.show() by a function that first calls pygame.event.peek(), which appears to be sufficient to cause the display to be refreshed without having any side effects.

  If you put this script in the Prepare phase of an inline_script at the very start of the experiment, does this fully resolve the issue? If so, this might be something to include in the next maintenance release of OpenSesame.

  import pygame
  from openexp._canvas import legacy
  
  
  def custom_show(old_show):
  
      def inner(self):
  
          pygame.event.peek()
          return old_show(self)
  
      return inner
  
  
  legacy.legacy.show = custom_show(legacy.legacy.show)
  

  Cheers,
  Sebastiaan

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• Pad

  June 2017

  It partialy resolves the issue. The sketchpads are displayed, but timing is messed up : a 500ms fixation dot is barely visible.
• sebastiaan

  June 2017

  The sketchpads are displayed, but timing is messed up : a 500ms fixation dot is barely visible.

  Ok, thanks for trying. When I'm back at the lab (where I have a Mac) I'll take a look at this more closely.

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• sebastiaan

  June 2017

  Right, the interaction needs to occur after showing the canvas. Also the crucial action appears to be that the event loop is processed, not anything with the keyboard per se.

  The following hack works for me with little obvious timing glitches.

  import pygame
  from openexp._canvas import legacy
  
  
  def custom_show(old_show):
  
      def inner(self):
  
          t = old_show(self)
          pygame.event.pump()
          return t
  
      return inner
  
  
  legacy.legacy.show = custom_show(legacy.legacy.show)
  

  @Daniel What do you make of this? Is this a sensible thing to do in your opinion? If so, we can implement this as a Mac-OS specific fix to 517.

  
  
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• sebastiaan

  June 2017

  @Pad Have you had a chance to try this out?

  
  
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• Pad

  June 2017

  Yes it solved the problem thanks ! I didn't precisely checked the timings but it seems to be ok.
  Do you know exactly when and why this bug occurs ? There are some iMac on my lab that are used for experimentations. Updates are usually made during summer, i'm guessing we will have to look closely if this bug appears.