Flash Player 9 and later, Adobe AIR 1.0 and
later, requires Flash CS3 or later
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The header in the
ActionScript code that you copy from Flash lists all the modules
required to support the motion tween.
Motion tween classes
The essential motion tween classes are the AnimatorFactory, MotionBase,
and Motion classes from the
fl.motion
package.
You could need additional classes, depending on the properties that
the motion tween manipulates. For example, if the motion tween transforms
or rotates the display object, import the appropriate
flash.geom
classes.
If it applies filters, import the
flash.filter
classes.
In ActionScript, a motion tween is an instance of the Motion class.
The Motion class stores a keyframe animation sequence that can be applied
to a visual object. The animation data includes position, scale,
rotation, skew, color, filters, and easing.
The following ActionScript
was copied from a motion tween that was created in Flash to animate
a display object whose instance name is
Symbol1_2
.
It declares a variable for a MotionBase object named
__motion_Symbol1_2
.
The MotionBase class is the parent of the Motion class.
var __motion_Symbol1_2:MotionBase;
Then
the script creates the Motion object:
__motion_Symbol1_2 = new Motion();
Motion object names
In the previous
case, Flash automatically generated the name
__motion_Symbol1_2
for
the Motion object. It attached the prefix
__motion_
to
the display object name. Thus, the automatically generated name
is based on the instance name of the target object of the motion
tween in Flash. The
duration
property of the Motion
object indicates the total number of frames in the motion tween:
__motion_Symbol1_2.duration = 200;
By
default, Flash automatically names the display object instance whose
motion tween is copied, if it does not already have an instance
name.
When you reuse ActionScript created by Flash in your own animation,
you can keep the name that Flash automatically generates for the
tween or you can substitute a different name. If you change the
tween name, make sure that you change it throughout the script.
Alternately, in
Flash you can assign a name of your choosing to the target object
of the motion tween. Then create the motion tween and copy the script.
Whichever naming approach you use, make sure that each Motion object
in your ActionScript code has a unique name.
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