5.1.1

Chapter 9 Behaviors 317
Note: Continue dragging beyond the limits of the graphical HUD control to extend the durations
of the Fade In or Fade Out.
Fade in
Fade out
Grow/Shrink
The Grow/Shrink behavior lets you animate the scale of an object, enlarging or reducing its size
over time. At the rst frame of the behavior, the object appears at its original size; the settings of
the behavior determine whether the object grows or shrinks over the duration of the eect. The
vertical and horizontal growth rates can be set to independent values, for asymmetrical eects.
Note: The Grow/Shrink behavior cannot be applied to cameras or lights.
You can use the Grow/Shrink behavior with high-resolution graphics to zoom into an image,
such as a map or photograph. You can combine this behavior with the Throw or Wind behavior
to pan across the image while zooming into it. The Grow/Shrink behavior can also be used to
emphasize or de-emphasize images in your project. For example, you can enlarge an object to
make it the center of attention, or shrink the object while introducing another object to move
the viewer’s eye to the new element.
Parameters in the Inspector
•
Increment: A pop-up menu that sets how the behavior’s eect progresses over its duration in
the Timeline. There are three options:
•
Continuous Rate: Uses the Scale Rate parameter to grow or shrink the object by a steady
number of pixels per second.
•
Ramp to Final Value: Grows or shrinks the object from its original size to the specied
percentage plus the original scale in the Scale To parameter. If the behavior is shortened in
the Timeline, the Grow/Shrink eect occurs faster.
•
Natural Scale: Uses an exponential curve so that the animation progresses slowly when
the scale values are small and speeds up when the values are large, creating the illusion of
scaling at a constant speed. This is the default option.
•
Scale Rate/Scale To: A slider that sets the speed and magnitude of the eect (depending on the
command chosen in the Increment pop-up menu). Click the disclosure triangle to reveal X and
Y sliders that adjust horizontal or vertical scale independently.
•
Curvature: A slider that adjusts the acceleration from the original to the nal size. Higher
Curvature values ease into and out of the eect. Because Curvature is dened by the length
of the behavior in the Timeline, minus the End Oset, this setting does not aect the overall
duration of the eect
Note: The Curvature parameter is not available when the Increment parameter is set to
Natural Scale.
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