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There are a few different ways to accomplish this. If it is a straight line, then you can have the line length increase gradually over frames using a tween. Another approach would be to use blocker objects that are the same color as the background that you gradually move to reveal the drawn lines. Another approach would be to use masks, similar tot he blocking approach, just moving them over the lines to reveal them.
thanks for responding.. how bout if its curve line?
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I would take either the mask or the blocking approach for that. Below is an image showing how I did it using the blocking approach. You can maybe see the curved blocker piece that I gradually slide off the stage as the pencil moves along (it's white so you can't see it on the white stage). The straight lines you see were done just extending their length with timeline tweens on layers above the curved lines. You basically have to get a little creative with the way you reveal things gradually--often working piece by piece for more intricate line drawings.
thanks for the cool advice man. you saved me again.. lols cheers!