[solved] Keyboard Arrows for Selection

Comments

• sebastiaan

  December 2015 edited December 2015

  Hi Jacob,

  This will indeed require a bit of Python coding, but nothing terribly complicated. Below you see an example of how you can adjust a 5-point scale with left/ right key presses, and accept by pressing space. The logic is explained in the code comments. You'll probably need to modify it a bit for your purpose, but it should get you started!

  See also:

  • http://osdoc.cogsci.nl/python/about/

  Cheers,
  Sebastiaan

  # For OpenSesame >= 3.0
  
  # Create a keyboard and canvas object
  cnv = canvas()
  kb = keyboard(keylist=['left', 'right', 'space'])
  
  # For the score, we use a 0 - 4 scale, and start at 2
  min_score = 0
  max_score = 4
  var.score = 2 # Use var to make this an experimental variable
  
  question = 'How awesome is OpenSesame?'
  
  while True:
      # Example: A score of two would be "XX___"
      # Clear the canvas and show this score string
      score_str = var.score*'X' + (max_score-var.score) * '_' 
      cnv.clear()
      cnv.text('%s<br /><br />%s' % (question, score_str))
      cnv.show()
      # Collect a response, and break the loop (i.e. accept the response)
      # When a space is pressed. Decrease the score for 'left', and increase
      # the score for 'right'.
      response, timestamp = kb.get_key()
      if response == 'space':
          break
      if response == 'left':
          var.score = max(min_score, var.score-1)
      elif response == 'right':
          var.score = min(max_score, var.score+1)
  

  
  
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• JacobAntony

  December 2015 edited 11:52AM

  Hey Sebastien,

  Thanks a bunch!! Yes, I modified it a bit to suit the experiment, but on the whole its just perfect. Thanks a bunch!
  4 stars for you and Open Sesame.

  Cheers!