[open] LineWidth incorrect?

Comments

• Josh

  March 2015 edited 6:51PM

  Hi Rjoos,

  I don't know what causes the 2 pixel width in this line of code. Will it become 4 pixels if you enter pw=2, and would it perhaps accept pw=0.5 to produce pixelwidth 1..?

  Anyway, you could try this: self.screen.append(Line(pygaze.expdisplay, start=(0,503), end=(constants.DISPSIZE[0],503), lineColor=colour, lineColorSpace='rgb', lineWidth=1))

  Or:
  stim = ShapeStim(pygaze.expdisplay, lineWidth=1, vertices=[spos, epos], lineColor='your_colour')

  self.screen.append(stim)

  Let me know if any of this works; otherwise we could turn to a developper to inquire about this!
  Good luck, cheers,
  Josh
• Rjoos

  March 2015 edited 6:51PM

  Hi Josh

  Maybe I misunderstood your idea; however, if I try

  tscr.append(Line(pygaze.expdisplay, start=(0,530), end=(constants.DISPSIZE[0],530), lineColor=GBC, lineColorSpace='rgb', lineWidth=1))

  I get the error message:

  AttributeError: PsychoPyScreen instance has no attribute 'append'

  Did I implement it the wrong way?

  Roland
• Edwin

  March 2015 edited 6:51PM

  Hi Roland,

  The correct snippet would be the following:

  tscr.screen.append(Line(pygaze.expdisplay, start=(0,530), end=(constants.DISPSIZE[0],530), lineColor=GBC, lineColorSpace='rgb', lineWidth=1))
  

  In addition, we have moved away from using the Line class, as it was dysfunctional in newer versions of PsychoPy (not sure whether that is fixed yet). Instead, we opted for using the ShapeStim class with two vertices (starting and ending point of the line). You could try to use the Line class, and I would be very interested in knowing if this a) works and b) fixes your problem.

  If lines are invisible with a penwidth of 1, or aren't wide enough, than this is due to the underlying PsychoPy class. I suggest using a penwidth of 2 (or 3), if this isn't an issue in your GUI design. Alternatively, you could raise the issue on the PsychoPy mailing list.

  On the segfault in your PyGame script: that's a curious one, which most often occurs when PyQt4 and PyGame interact somehow. I am not familiar with the GUI library you mentioned, but this could result in a similar conflict. This is rather unsatisfying, but I don't know how to solve it (or even where to start looking).

  Good luck!

  Edwin