[solved] Rotating Fixation Point

Comments

• sebastiaan

  January 2012 edited 10:19AM

  Hi Vikki,

  Welcome to the forum!

  If you're brand new, you might want to start by doing the tutorial. It won't take too long, and it will really help you to get started. It will also help you to understand the explanation below.

  • http://osdoc.cogsci.nl/usage/step-by-step-tutorial

  Regarding your question. There are a couple of ways to do this. I'll explain two:

  Using flexible coordinates
  First, create two variables in a loop table, and give them the coordinates that you want to use. Let's call them x_fix and y_fix to indicate that they are the coordinates of the fixation dot. Say, like this:

  x_fix y_fix
  -100 -100
  -100  100
  100   100
  100  -100

  Next, draw a fixation dot at a random location on the sketchpad. Right click on the fixation dot and select edit. Now, change the piece of script so that the static coordinate values are replaced by the variables, like so:

  draw fixdot [x_fix] [y_fix] color=white show_if="always"

  Now press ok and you're done!

  Using multiple sketchpads and the 'run if' option in a sequence
  First create a single variable, let's call it fix_pos, in a loop table that indicates the position of the fixation dot. Say, like this:

  fix_pos
  topleft
  topright
  bottomleft
  bottomright

  Next, create a couple of different sketchpads with the fixation dots as you'd like to see them. Then use the run-if statement of the sequence that contains the sketchpad to define when the sketchpads should be shown. For example, the run-if statement for the sketchpad with the fixation dot in the top left should look like this:

  [fix_pos] = topleft

  
  

  • Also see http://osdoc.cogsci.nl/usage/variables-and-conditional-qifq-statements

  Hope this helps!

  Cheers,
  Sebastiaan

  
  
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• Vikki

  January 2012 edited 10:19AM

  Thank you for you rapid response :-)

  I shall do your suggestions. I have another question, but I will have a go at the tutorial before I ask, see if I can problem solve!

  Thanks again,

  Vikki