Chapter 8 – Part III Interactive Multimedia Authoring with Flash: Animation

Chapter 8 – Part IIIInteractive Multimedia Authoring with Flash:

Animation

Flash: Tweening “Computers and Creativity”

Richard D. Webster, COSC 109 InstructorOffice: 7800 York Road, Room 422 | Phone: (410) 704-2424

e-mail: [email protected] website: http://pages.towson.edu/webster/109/

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mailto:[email protected]

http://pages.towson.edu/webster/109/

In this lecture, you will learn:

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• the types of tweening: – classic tween– motion tween– shape tween

• how to create tween animation

• how to animate an object following a custom path

Tweening

• To create movement and changes of visual content over time, without having to manually create the content frame by frame

• The computer interpolates the changes between 2 keyframes

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To Create Keyframes in Flash

• Method 1:– Select a frame on timeline– Choose Insert > Timeline > Keyframe

• Method 2:– Right-click (Windows) or Control-click (Mac OS) on

a frame on timeline– Choose Insert Keyframe

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Types of Tween in Flash

• Classic tween (called Motion tween in Flash CS3 and prior)

• Motion tween• Shape tween

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Motion (Classic) Tween vs. Shape Tween

Motion and Classic Tween Shape Tween

Works with symbols only Works with shapes only

Not changing the shapes Morphing the shapes

Cannot have more than one symbol in a frame of the same layer

Can have more than one shapes in a keyframe, but the result is unpredictable

Can be tweened to follow a path that is drawn as a stroke

Does not work with motion guide

Tweened frames are colored blue (Motion tween) or purple (Classic tween) on timeline

Tweened frames are colored green on timeline

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Classic Tween

Example

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Example of Classic Tween

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A leaf is created as a Graphic symbol, and placed on the stage.


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Keyframe at frame 1


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Keyframe at frame 20:The leaf is repositioned, rotated, and scaled bigger.


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Keyframe at frame 60:The leaf is repositioned again, rotated, and scaled smaller.


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Result after applying classic tween to the keyframes:• 60 frames• But only 3 keyframes to specify

the leaf's position, rotation, and size.

• The computer interpolates the positions, rotation, and size of the leaf between keyframes.

Properties of a symbol instance that can be tweened using Classic tween

• Position• Rotation• Width• Height• Color• Opacity

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Motion Tween

Example

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Example of Motion Tween

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A leaf is created as a Graphic symbol, and placed on the stage.


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Keyframe at frame 1


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Keyframe at frame 20:The leaf is repositioned, rotated, and scaled bigger.


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Keyframe at frame 60:The leaf is repositioned again, rotated, and scaled smaller.

Properties of a symbol instance that can be tweened using Motion tween

• Position• Rotation• Width• Height• Color (Classic tween)• Opacity (Classic tween)

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Shape Tween

Example

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Example of Shape Tween

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Keyframe at frame 1:A shape of the letter "I" in blue


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Keyframe at frame 15:A heart shape in pink


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Keyframe at frame 40:A shape of the letter "U" in green


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Result after applying shape tween to the keyframes:• 40 frames• But only 3 keyframes to specify

the shapes.• The computer interpolates the

shapes between keyframes.

Properties of a shape that can be tweened in shape tween

• Position• Rotation• Width• Height• Color• Opacity• Shape

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Troubleshooting

• If a Classic or Shape tween sequence is working correctly:an solid-line arrow in timeline

• If a Classic or Shape tween sequence is working correctly:a dash line in timeline

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Possible Causes for Tweening Problems

• Multiple symbol instances in the same keyframe

• Classic tween applied to shapes

• Shape tween applied to symbol instances

• A mix of symbol instances and shapes in the same keyframe

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Tween a Symbol to Follow a Path

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Tween a Symbol to Follow a Path

• Motion path– for Motion tween

• Motion guide– for Classic tween

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Motion Guide

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Motion Guide

• Allows an object to follow a path that you draw as a stroke

• Works with symbols, not shapes

• Note that the color and width of the path in the motion guide do not matter

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To Create Animation with Motion Guide

1. Create keyframes like you would create a classic tween animation

2. Create a motion guide layer for the tween animation:1. In the timeline, right-click (Windows) or Control-click (Mac OS) on the

motion tween layer.2. Choose the option of motion guide

3. In the motion guide layer, draw a path (using pencil or pen tool) in one single stroke.Do not create multiple strokes.

4. For each keyframe of the tween animation, drag the symbol instance to snap on the path.

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Motion Guide

Example:Returning to the leaf animation to

make it follow a more complex path

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Example of Motion Guide

34A classic tween sequence with the leaf is created using only 2 keyframes.


35A motion guide is created for the classic tween layer.


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A complex path is drawn in the motion guide layer using the Pencil tool.


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The leaf in frame 1 (first keyframe) is snapped to the beginning of the path.


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The leaf in frame 60 (last keyframe) is snapped to the end of the path.


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Result:• 60 frames of animation• The leaf follows the path drawn

in the motion guide layer

More About Motion Guide

• The color and width of the path do not matter.

• The motion guide is automatically hidden when the movie plays.

• In the example:– Only 2 keyframes are used but it can have more than 2

keyframes.– The leaf is snapped to the two ends of the path, but it can

be snapped anywhere along the path.

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Motion Path

for Motion tween

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Motion Path

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A motion path is automatically generated for each Motion twee span.

Motion Path

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Can be edited like a stroke using Selection and Subselection tools

Motion Path

• Can also be a custom-drawn stroke• To apply a stroke as the motion path for a

Motion tween:1. Copy the stroke2. Select the Motion tween span on the timeline3. Paste the stroke

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Chapter 8Interactive Multimedia Authoring with Flash:

Animation

Flash: Mask

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Mask• Defines areas to reveal its linked layer (maskee

layer)

• The content in a mask layer can be thought of as a hole that lets the underlying maskee layers show through.– In other words, the mask item acts as a window

that reveals the area of linked layers that lie beneath it. The rest of the mask layer conceals everything else on these linked layers

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Mask

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a mask

original

mask effect

To Create Mask Effect

1. On the timeline, arrange the maskee layer immediately below the layer that you want to be the mask layer.

2. On the timeline, right-click (Windows) or Control-click (Mac OS) on the mask layer, and select Mask.

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Mask Effect Example

Spotlight Effect

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Mask Effect Example:Spotlight Effect

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51Maskee layer

Maskee content


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Mask layer

Mask content:black circle

Mask Effect Appliedby locking the mask layer

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More About Mask Effect

• The resulted mask effect can be seen on the stage by locking the mask layer.

• The mask effect always shows when you do a Test Movie, with or without unlocking the mask layer.

• Don't forget to unlock the mask layer when you want to edit the mask layer.

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Mask Effect Example

X-ray Effect

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Mask Effect Example:X-ray Effect

mask layer,immediately above the maskee layer(s)

Right-click on it, choose "Mask" to make it a mask

maskee layer(s)

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mask layer,immediately above the maskee layer(s)

Right-click on it, choose "Mask" to make it a mask

maskee layer(s) Resulted mask effect

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Add a bottom layer of a man

Result

If you create a tween animation of the x-ray bar (the mask), then you get

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Mask Effect Example

Appearance Effect

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Mask Effect Example:Appearance Effect

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Maskee layer:Contains only the little alien


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Mask layer:Contains only the light beam


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Mask effect is applied by locking the mask layer.Note: The mask does not always show up.


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Blue beam layer:Overlay the blue beam by adding it on another layer because we want to see the blue beam.

If you tween the height of the blue beam (both the mask and the blue beam on the extra layer),

then you get

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Chapter 8 – Part III Interactive Multimedia Authoring with Flash: Animation

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