Tài liệu Thiết kế flash với flash cs5 part 43 ppt

ptg
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Chapter 10
The procedure for adding or removing keyframes in a shape tween is
similar to that of motion tweens except for one crucial difference. In a
motion-tweened framespan you can drag the object on the Stage and a
new keyframe is automatically created. In shape-tweened spans, the
object is only selectable on a keyframe. To add additional locations or
shape changes along a shape-tweened span, you must add the
keyframe first and then edit the shape. You can do this by using the Add
Keyframe function in the Insert menu. Once the keyframe is added, the
shape at that point in the framespan becomes editable.
Adding and Removing
Keyframes from a
Shape Tween
Add a Keyframe to a
Shape Tween
Place the playhead between any
two shape tweened keyframes.
Click the Insert menu, point to
Timeline, and then click Keyframe.
TIMESAVER
Press F6 to insert
a keyframe.
2
1
1
Keyframe is added
From the Library of Wow! eBook
ptg
Chapter 10 Animating with Shape Tweening

279
Remove a Keyframe from a
Shape Tween
Click on the keyframe you want to
remove in the shape tween.
Click the Modify menu, point to
Timeline, and then click Clear
Keyframe.
The keyframe is cleared but the
duration of the tween is preserved.
The first and last keyframes are
automatically reconnected, and
Flash redraws the tween.
TIMESAVER
Press Shift+F6 to
remove the keyframe.
2
1
1
Keyframe is removed
Duration is maintained
From the Library of Wow! eBook
ptg
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Chapter 10
To create a shape tween you need to draw or place an editable shape
in a keyframe. Use any of Flash's drawing tools or import a vector
shape from another vector drawing program. If you want to apply a
shape tween to grouped artwork or a symbol, you can break apart the
group or enter symbol editing mode and apply the shape tween to any

editable shape in the symbol's Timeline. You can quickly view your ani-
mation by exporting it with the Test command (in Flash Professional).
By default, Flash loops animations in the Flash Player.
Changing Shape
Positions with Shape
Tweening
Animate a Ball with
Shape Tweening
Create a new Flash document.
Select the Oval tool on the Tools
panel.
Set the Stroke Color to None.
On the first frame, draw a circle on
the left side of the Stage.
Select the first frame.
Click the Insert menu, and then
click Shape Tween.
Click frame 20 in the Timeline.
Click the Insert menu, point to
Timeline, and then click Keyframe.
Flash tints a shape-tweened span
a pale green.
TIMESAVER
Press F6 to add a
keyframe.
8
7
6
5
4

3
2
1
3
5
7
4
Circle position
on Frame 1
2
From the Library of Wow! eBook
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Chapter 10 Animating with Shape Tweening
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Select the Selection tool on the
Tools panel.
Select the circle on frame 20 and
drag it to the right side of the
Stage.
Click frame 40 in the Timeline, and
then add another keyframe.
Select the circle shape on frame
40 and drag it back to the left side
of the Stage.
Click the Control menu, point to
Test Movie, and then click Test.
The ball animates back and forth
across the screen.
13
12

11
10
9
9
10
13
Circle position on Frame 20
Circle position on Frame 40
11
From the Library of Wow! eBook
ptg
282
Chapter 10
Many of the same motion effects can be applied using either motion or
shape tweening. What differentiates shape tweening from motion
tweening is that shape tweening is applied to editable shapes. You can
change the form of the shape on either keyframe and these changes
will be applied gradually by Flash across the tween, slowly morphing
one into the other. Additionally, you can combine movement with this
tweening process, so your shape can change its shape as it changes
its location.
Changing Shape
Position and Form
Simultaneously
Combine Shape Tweening and
Movement in a Ball Animation
Create a shape tween of a moving
ball that begins on the left side of
the Stage, hits the right side of the
Stage, and then returns to the left.

Click to place the playhead
between the first and second
keyframes in the shape tween.
Click the Insert menu, point to
Timeline, and then click Keyframe.
Select the Selection tool on the
Tools panel.
Place the pointer on the left edge
of the shape and pull it to create a
tail off the circle.
The shape must be deselected on
the Stage to pull the edges of the
shape.
5
4
3
2
1
4
5
Small curve icon indicates
editable curve.
New keyframe
placed at Frame 10.
Shapes must be deselected
to pull the edges.
2
1
From the Library of Wow! eBook