[open] Moving Object

Comments

• sebastiaan

  June 2015 edited 11:52AM

  Hi Alessio,

  You should think of a moving display as a series of frames. So what you would need to do is write an inline_script in which a canvas is redrawn over and over, each time with a circle at a slightly different position. And at the same time, you need to continuously check whether a mouse button was pressed, and, if so, end the loop. Do you see what I mean? The script below shows the general idea, although you'll probably have to modify it a bit for your purpose. (For example, to include a color change.)

  You can find useful information here:

  • http://osdoc.cogsci.nl/python/about/#learning-python
  • http://osdoc.cogsci.nl/python/canvas/
  • http://osdoc.cogsci.nl/python/mouse/

  Good luck!

  Cheers,
  Sebastiaan

  from openexp.canvas import canvas
  from openexp.mouse import mouse
  
  # The Y coordinate in the middle of the screen
  y = self.get('height') / 2
  # The minimum and maximum X coordinates
  min_x = 100
  max_x = self.get('width') - 100
  # The displacement on each frame
  step_size = 1
  # The radius of the circle
  r = 10
  
  # Create a canvas and a mouse object
  my_canvas = canvas(exp)
  my_mouse = mouse(exp, timeout=0)
  
  # Loop through all X coordinates
  for x in range(min_x, max_x+1, step_size):
      # Clear the canvas, draw a circle, and show it
      my_canvas.clear()
      my_canvas.circle(x, y, r)
      my_canvas.show()
      # See if a button was clicked, and, if so, break the loop
      button, pos, timestamp = my_mouse.get_click()
      if button is not None:
          break
  

  
  
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