length_from_visual_angle_ppd
============================



.. py:function:: stimupy.utils.length_from_visual_angle_ppd(visual_angle, ppd, round=True)


   Calculate length (pixels) from visual angle (degrees) and pixels-per-degree

   :param visual_angle: visual angle in degrees
   :type visual_angle: float or None
   :param ppd: pixels per degree
   :type ppd: int or None
   :param round: if True, round output length to full pixels
   :type round: bool

   :rtype: visual angle (degrees) translated to length (pixels)