# help making movies

**URL:** <https://psychtoolbox.discourse.group/t/help-making-movies/1081>\
**Category:** Uncategorized\
**Created:** [February 9, 2005, 5:03am UTC](https://psychtoolbox.discourse.group/t/help-making-movies/1081 "2005-02-09T05:03:56Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [February 9, 2005, 5:03am UTC](https://psychtoolbox.discourse.group/t/help-making-movies/1081/1 "2005-02-09T05:03:56Z")

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Hi,  
  
I just started using psychtoolbox and I need some help with a very   
simple movie I created.  
  
the code is bellow:  
  
screenNumber=0;  
[window,windowRect]=Screen(screenNumber,'OpenWindow',100,[],8);  
n=500;  
rect=[0 0 n 150];  
rect2=CenterRect(rect,Screen(window,'rect'));  
waitSecs(1);   
for i=1:n  
 w(i)=Screen(window,'OpenOffscreenWindow',0,rect);  
 r=[0+i 0 5+i 150];  
 Screen(w(i),'Fillrect',250,r);  
end  
loop={  
'for i=1:length(w);'  
'Screen(window,''WaitBlanking'');'  
's(i)=GetSecs;'  
'Screen(''CopyWindow'',w(i),window,rect,rect2);'  
'end;'  
};  
hidecursor;  
priorityLevel=MaxPriority(screenNumber,'WaitBlanking');  
Screen(window,'FillRect');  
i=0;Screen('Screens');   
Rush(loop,priorityLevel);  
s=diff(s);  
frames2=sum(s)\*FrameRate(screenNumber)-length(s)  
ShowCursor;  
Screen('CloseAll');  
  
i need a simple white bar that will move along the screen on a black   
background (I need the whole screen to be black), even though in line   
2 I define the window to be black is still white.  
Also, how can I gradually control the speed of the moving bar?  
  
If you would by a PC computer especially for running psychtoolbox   
functions, what RAM memory and video card would you buy.  
  
Thank you very much,  
  
german