How to Fade a Sound Object Up or Down |
| Fig. 08: Example of fading a sound object in and out |
By setting the volume of a sound object with a variable that increments or decrements, the sound can fade in or out. To do this, first configure the sound object as described in the previous section for setting the sound object's volume.
One way to increment or decrement a variable is to add or subtract from the variable each time a frame is processed. Using Flash MX's event handlers, you can easily do this in the first frame of any movie clip that loops. Obviously, if you want to fade sound in, you must first set the initial volume level of the sound object to zero or some other low level.
| myLoop = new Sound(myLoopMc); myLoop.attachSound("myLoop01"); myLoopVolume=0; myLoop.setVolume(myLoopVolume); |
The following is some example code that can be used to fade in a sound when a variable becomes true (of course, the text behind the comment characters "//" can be removed if desired):
this.onEnterFrame = function () { |
To fade out a sound object, the ActionScript is nearly identical, except that the variable for volume is decremented instead of incremented.
| this.onEnterFrame = function () { //Fade Out if (fadeOut01==1) { _root.myLoop.setVolume(myLoopVolume); myLoopVolume=myLoopVolume-5; if (myLoopVolume<5) { _root.myLoop.stop("myLoop01"); fadeOut01=0; } } } |
| » Level Intermediate |
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Added: 2004-10-12 Rating: 8 Votes: 31 |
| » Author |
| Kenny Bellew is a technical writer and freelance flash programmer who specializes in Flash audio. He lives in Minneapolis, MN. |
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