Using forms in Psychopy backend

Comments

• Josh

  September 2016

  Hi,

  I'm not sure what causes your problem, but it is certainly possible to create a form by means of an inline_script rather than the widgets. This will require a bit of coding however. You'll have to manually program a text bar in which people can input text, and this text also needs to be made visible as the participant types.
  I do have some code that takes care of this here:

      answered = False
      letters = 0
      resp = ''
  
      while answered == False:
          key, timestamp = my_keyboard.get_key(timeout = 1)
          if key == 'backspace':
              if len(resp)>0:
                  startpoint -= exp.input_canvas.text_size('w')[0]
                  exp.input_canvas.rect(x=startpoint-exp.canvas.text_size('x')[0]*0.5,y=exp.canvas.ycenter()+30,\
                  w=exp.canvas.text_size('w')[0], h = 30, fill=True)
                  exp.input_canvas.show()
                  resp = resp[0:-1]
          elif key == 'return':
              answered = True
          elif key != None and key != 'left' and key != 'right' and len(resp)<6:
              exp.input_canvas.rect(x=startpoint,y=exp.canvas.ycenter()+30,\
              w=exp.canvas.text_size('w')[0], h = 30, fill=True)
              exp.input_canvas.text(key,x=startpoint,y=exp.canvas.ycenter()+45, color='white')
              startpoint += exp.input_canvas.text_size('w')[0]
              exp.input_canvas.show()
              resp += key
  

  You just have to define the variable startpoint, which represents the x-coordinate at which the first letter needs to appear. All the other info and instructions you want to have on your form can be added with the canvas.text() function (see also http://osdoc.cogsci.nl/3.1/manual/python/canvas/#function-canvas46text40text-centertrue-xnone-ynone-max95widthnone-4242style95args41).

  Cheers,

  Josh
• arpit

  September 2016

  Thanks Josh,
  I tried running the above code in psychopy backend but when I run the code all I see is a blank screen. I think I am able to enter the text input but it is not visible. Am I missing something?

  For reference, I am posting the inline script I am using:

  from openexp.keyboard import keyboard
  from openexp.canvas import canvas
  my_keyboard = keyboard(exp, timeout=None)
  input_canvas = canvas(exp)
  startpoint = input_canvas.xcenter()
  answered = False
  letters = 0
  resp = ''

  while answered == False:
  key, timestamp = my_keyboard.get_key()
  if key == 'backspace':
  if len(resp)>0:
  startpoint -= input_canvas.text_size('w')[0]
  input_canvas.rect(x=startpoint-input_canvas.text_size('x')[0]*0.5,y=input_canvas.ycenter()+30,\
  w=input_canvas.text_size('w')[0], h = 30, fill=True)
  input_canvas.show()
  resp = resp[0:-1]
  elif key == 'return':
  answered = True
  elif key != None and key != 'left' and key != 'right' and len(resp)<6:
  input_canvas.rect(x=startpoint,y=input_canvas.ycenter()+30,\
  w=input_canvas.text_size('w')[0], h = 30, fill=False)
  input_canvas.text(key,center=True, x=startpoint,y=input_canvas.ycenter()+45, color='white')
  startpoint += input_canvas.text_size('w')[0]
  input_canvas.show()
  resp += key
• arpit

  September 2016

  I was able to figure out that I was defining the coordinates of rect and text in a format supported by earlier version of open sesame by taking the top left coordinate, because of which they were being drawn outside of the screen. By changing it, relative to the center coordinates I was able to get the result.

  Thanks for the help!
• Josh

  September 2016

  No problem!

  Josh