Creating animated lines (see sample here)

1. Open a new flash file.
2. In the first keyframe of the first layer draw the lines which you want to show in animation sequence.eg.a square in the sample shown here.
3. Create a new layer on top of this layer. In the first keyframe, draw any shape some distance away from the square you have drawn in the first layer. See picture below.

4. Now go to frame 10.In the second layer insert a key frame here by pressing F6. In layer 1 insert frame by pressing F5.
5. Now enlarge the shape in the second layer to completely cover the square of the first later. See adjoining picture .
6.Now right-click anywhere between frames 1 & 10 of the second layer & choose create motion tween.Don't forget to group the shape in frames 1 & 10 before you create the motion tween.
7. Now in the layers panel, right-click the second layer & choose mask.Now play your movie.

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