Eye-tracking sentence reading: issues coordinating stimuli with ROIs

Comments

• sebastiaan

  November 2023

  Hi @Ana_C ,

  This script indeed doesn't work properly anymore because the way that text is rendered has changed since this post (it changed from 3.2 to 3.3). To work around this, you need to draw one word at a time, rather than the entire string at once. I adjusted the original script (from the discussion you linked to) to do this, see below. You can adjust in turn so it fits into your own script.

  I am designing an experiment with Opensesame but my programming skills are very limited.

  Even when the presentation script is fixed, this will be a tricky dataset to analyze if you are not a proficient programmer. Therefore, before you start, carefully think all stres through, including how you are going to analyze this data once you've collected it!

  — Sebastiaan

  def draw_roi_text(c, text, x=0, y=0, show=False, **kwargs):
  
  
      """Draws text to a Canvas and additionally defines an ROI for each word and
      following space. The ROIs are named Canvas elements. The show keyword
      indicates whether the ROIs should be colored for visual debugging.
      """
  
  
      roi_x = x
      roi_y = y
      for i, word in enumerate(text.split()):
          # Words
          w, h = c.text_size(
              u'<span style="background:red;">%s</span>' % word,
              center=False,
              **kwargs
          )
          # Define ROI for word
          c['word%d' % i] = Rect(
              roi_x,
              roi_y,
              w,
              h,
              color='red' if show else var.background,
              fill=True
          )
          # Draw one word at a time
          c.text(word, x=roi_x, y=y, center=False, **kwargs)
          roi_x += w
          # Spaces
          w, h = c.text_size(
              u'<span style="background:red;">&nbsp;</span>',
              center=False,
              **kwargs
          )
          # Define ROI for word
          c['space%d' % i] = Rect(
              roi_x,
              roi_y,
              w,
              h,
              color='green' if show else var.background,
              fill=True
          )
          roi_x += w      
      # Don't draw the entire string at once
      # c.text(text, x=x, y=y, center=False, **kwargs)
  
  c = Canvas()
  draw_roi_text(c, 'This is a string', show=True)
  c.show()
  

  
  
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