alpha (DropShadowFilter.alpha property)

The alpha transparency value for the shadow color. Valid values are 0 to 1. For example, 0.25 sets a transparency value of 25%. The default value is 1.

Example

The following example changes the alpha property on a movie clip when a user clicks it.

import flash.filters.DropShadowFilter;
var mc:MovieClip = createDropShadowRectangle("DropShadowAlpha");
mc.onRelease = function() {
    var filter:DropShadowFilter = this.filters[0];
    filter.alpha = 0.4;
    this.filters = new Array(filter);
}

function createDropShadowRectangle(name:String):MovieClip {
    var art:MovieClip = this.createEmptyMovieClip(name, this.getNextHighestDepth());
    var w:Number = 100;
    var h:Number = 100;
    art.beginFill(0x003366);
    art.lineTo(w, 0);
    art.lineTo(w, h);
    art.lineTo(0, h);
    art.lineTo(0, 0);
    art._x = 20;
    art._y = 20;

    var filter:DropShadowFilter = new DropShadowFilter(15, 45, 0x000000, 0.8, 16, 16, 1, 3, false, false, false);
    var filterArray:Array = new Array();
    filterArray.push(filter);
    art.filters = filterArray;
    return art;
}