Tutorial: Self-Wiping 1-Layer Text

//alt-click the stopwatch of Mask Path under Mask1 of a text

//paste this code in that expression field

//animate the Anchorpoint to wipe text in and out, Vertical or Horizontal

a = thisLayer.sourceRectAtTime();

x = thisLayer.transform.position[0];

y = thisLayer.transform.position[1];

h = a.height;

w = a.width;

t = a.top;

l = a.left;

createPath(points=[[l,t]+transform.anchorPoint,[l+w,t]+transform.anchorPoint,[l+w,t+h]+transform.anchorPoint,[l,t+h]+transform.anchorPoint]);