ActionScript for Flash MX: The Definitive Guide, Second Edition

MovieClip.beginFill() Method

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ActionScript Language Reference

However, properties inherited through initObject’s prototype chain are not copied to

the clip. Only direct properties are transferred. To determine whether a property is inher-

ited or direct, use Object.hasOwnProperty(). Built-in movie clip properties, such as

_x

and _rotation, and event handlers, such as onEnterFrame(), can be set (i.e., copied to

the newly created movie clip instance) via

initObject. For example:

var tempObj = new Object();

// Set _rotation

tempObj._rotation = 200;

// Assign an onEnterFrame() callback

tempObj.onEnterFrame = function () {

this._x++

};

// Once attached, tennisBall_mc will be rotated by 200 degrees and will

// start moving one pixel right per frame due to the onEnterFrame() handler

court_mc.attachMovie("ball_symbol", "tennisBall_mc", 1, tempObj);

In Flash 6, the initObject parameter is used to set properties in newName that will be used by

its class constructor (effectively the same as passing arguments to the constructor). A movie

clip symbol’s class constructor is defined by the Object.registerClass() method. For conve-

nience,

initObject can be specified as an anonymous object. For example:

court_mc.attachMovie("ball_symbol", "tennisBall_mc", 1, {speed: 200, _x: 165} );

The initObject parameter ...