[visionegg] [visionegg]the time in the demo

Hi all,
   I have two questions when running the demo of makemovie.py and I am looking 
for some help.
  When I changed the presentation time in the command 
  p = Presentation(go_duration=(1,'seconds'),viewports=[viewport])
   
  in fact,the duration of the stimulus is more than 1 seconds(about 4 s).
   
  Another question is in the follow commands:
  # define position as a function of time
def get_target_position(t):
    global mid_x, mid_y, max_vel
    return ( max_vel*sin(0.1*2.0*pi*t) + mid_x , # x
             max_vel*sin(0.1*2.0*pi*t) + mid_y ) # y
   
  in the programe, the t has not been defined, and I can not export its value.
  Could anyone tell me that how the value of 't' has been setted?
   
  Thanks a lot!
   
  Lili Wu



              
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