What's a convenient way to author and efficiently display (in a game) line drawings where the lines "grow out" as if they're magically being drawn while you watch it?

I could see it being stored as gradients from start points to end points, and a shader displaying increasingly more of the gradient. However, if I'd want anti-aliasing at the same time, that would have to be stored separately. Not sure how to easily author something like that.

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