I'm trying to work out how i can make a drawing look like its being drawn on the screen instead of just appearing instantly when the sketch runs, can't seem to find the right way to do it, lots of ways to make things move but not to reduce teh speed at which something is drawn. used to using after effects etc and if i was using that i'd draw everything out and then use a mask to reveal the lines that had been drawn. not sure if there is an equivalent or if this is the best way. anyway any help would be really appreciated. 

thanks.

Ditchweed