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Chapter 10. Creating Masks > Animating a Mask Layer

Animating a Mask Layer

To create special effects such as a spotlighting effect or a gradual reveal of artwork on the Stage, you can animate a mask. Use any form of animation such as frame-by-frame animation or a shape or motion tween. The path of the shape or object on the mask layer will reveal the art below as it passes over it. Transforms to scale and position work well as well as shape tweens to editable objects. Other effects such as color and alpha will be ignored.

Animate a Mask

Place artwork in a linked layer.

Click on the first frame of the layer's mask layer in the Timeline.

Do one of the following:

  • Draw a shape on the Stage with any of Flash's drawing tools.

  • Drag an instance of a symbol from the Library.

Select the first frame.

Click the Tween popup in the Property Inspector, and then click Motion (when using symbols) or Shape (when using editable shapes).

Click frame 10 in the Timeline.

Click the Insert menu, point to Timeline, and then click Keyframe.

TIMESAVER Press F6 to add a keyframe.

Transform the object with any of Flash's editing procedures: scale, skew, position, or in the case of shape tweening, edit the shape of the object.

Lock the mask layer and linked layer to see the effect.


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