358 Working with Movie Clips
Some properties, called read-only properties, have values that you can read but cannot set.
(These properties are specified as read-only in their ActionScript 2.0 Language Reference
entries.) The following are read-only properties:
_currentframe, _droptarget,
_framesloaded, _parent, _target, _totalframes, _url, _xmouse, and _ymouse.
You can write statements to set any property that is not read-only. The following statement
sets the
_alpha property of the wheel_mc movie clip instance, which is a child of the
car_mc instance:
car_mc.wheel_mc._alpha = 50;
In addition, you can write statements that get the value of a movie clip property. For example,
the following statement gets the value of the
_xmouse property on the current level’s timeline
and sets the
_x property of the my_mc instance to that value:
this.onEnterFrame = function() {
my_mc._x = _root._xmouse;
};
This is equivalent to the following code, which uses the getProperty() function:
this.onEnterFrame = function() {
my_mc._x = getProperty(_root, _xmouse);
};
The _x, _y, _rotation, _xscale, _yscale, _height, _width, _alpha, and _visible
properties are affected by transformations on the movie clip’s parent, and transform the movie
clip and any of the clip’s children. The
_focusrect, _highquality, _quality, and
_soundbuftime properties are global; they belong only to the level 0 main timeline. All other
properties belong to each movie clip or loaded level.
For a list of movie clip properties, see the property summary for the MovieClip class in
the ActionScript 2.0 Language Reference.
For an example of scripted animation in Flash, you can find a sample source file,
animation.fla, in the Samples folder on your hard disk.
■ In Windows, browse to boot drive\Program Files\Macromedia\Flash 8\Samples and
Tutorials\Samples\ActionScript\Animation.
■ On the Macintosh, browse to Macintosh HD/Applications/Macromedia Flash 8/Samples
and Tutorials/Samples/ActionScript/Animation.
You can find samples of photo gallery applications on your hard disk.These files provide
examples of how to use ActionScript to control movie clips dynamically while loading image
files into a SWF file, which includes scripted animation. You can find the sample source files,
gallery_tree.fla and gallery_tween.fla, in the Samples folder on your hard disk.
■ In Windows, browse to boot drive\Program Files\Macromedia\Flash 8\Samples and
Tutorials\Samples\ActionScript\Galleries.
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