I want to create a dashed line that grows longer. I made two keyframes (at frame 1 and frame 15) with dashed lines of different lengths. Motion or Classic Tween just makes the small line move to the right and then turn into the long line immediately at frame 15.
Shape Tween gets me the closest (actually shows a line growing), however, it turns into a solid line in the intermediate steps.
My next idea is to create a mask that slowly reveals more of the line. Is that the best solution?
yes, use a tweened mask. that's the easiest solution.