is it possible to draw stimuli with OSweb?

Comments

• sebastiaan

  June 2021

  Hi @reichardtr ,

  In OSWeb, you cannot draw things programmatically onto a Canvas object in the same way that you can do that with a Python script in regular OpenSesame. However, what you can do, and what works ok in many situations, is to define sketchpad items in terms of variables, and then using inline_javascript items to manipulate these variables.

  To be a bit more specific, say that you initially show a sketchpad with stimuli that the participant can select by clicking on them. This is then followed by a mouse_response that registers the location of a mouse click. Based on the variables cursor_x and cursor_y you can then deduce which stimulus the participant clicked on, with some simple logic in an inline_javascript item, and assign this to, say, a variable called selected_stimulus . Next, you collect another mouse click with another mouse_response , and then finally show a feedback item that uses the variables cursor_x , cursor_y , and selected_stimulus to draw the selected stimulus on the location that the participant clicked on. That's a crude form of drag-and-drop, basically.

  Hope this helps!

  — Sebastiaan

  
  
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• reichardtr

  June 2021

  Hi Sebastiaan,

  great idea, thank you! I am almost done with the task now, seems to work perfectly.

  All the best,

  Richard