MACROMEDIA FLASH 8-FLASH, Руководство пользователя

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Using shape hints 263
Using shape hints
To control more complex or improbable shape changes, you can use shape hints. Shape hints
identify points that should correspond in starting and ending shapes. For example, if you are
tweening a drawing of a face as it changes expression, you can use a shape hint to mark each
eye. Then, instead of the face becoming an amorphous tangle while the shape change takes
place, each eye remains recognizable and changes separately during the shift.
Shape hints contain letters ( a through z ) for identifying which points correspond in the
starting and ending shape. You can use up to 26 shape hints.
Shape hints are yellow in a starting keyframe, green in an ending keyframe, and red when not
on a curve.
For best results when tweening shapes, follow these guidelines:
■
In complex shape tweening, create intermediate shapes and tween them instead of just
defining a starting and ending shape.
■
Make sure that shape hints are logical. For example, if you’re using three shape hints for a
triangle, they must be in the same order on the original triangle and on the triangle to be
tweened. The order cannot be
abc in the first keyframe and acb in the second.
■
Shape hints work best if you place them in counterclockwise order beginning at the top
left corner of the shape.
To use shape hints:
1.
Select the first keyframe in a shape-tweened sequence.
2.
Select Modify > Shape > Add Shape Hint.
The beginning shape hint appears as a red circle with the letter a somewhere on the shape.
3. Move the shape hint to a point that you want to mark.
4. Select the last keyframe in the tweening sequence.
The ending shape hint appears somewhere on the shape as a green circle with the letter a .
5. Move the shape hint to the point in the ending shape that should correspond to the first
point you marked.
6. Play the animation again to see how the shape hints change the shape tweening. Move the
shape hints to fine-tune the tweening.
7.
Repeat this process to add additional shape hints. New hints appear with the letters that
follow (
b, c, and so on).
You can choose to view all shape hints, and you can remove shape hints.