DropShadowFilter  - AS3

The alpha transparency value for the shadow color. Valid values are 0.0 to 1.0. For example, .25 sets a transparency value of 25%. The default value is 1.0.

The angle of the shadow. Valid values are 0 to 360 degrees (floating point). The default value is 45.

The amount of horizontal blur. Valid values are 0 to 255.0 (floating point). The default value is 4.0.

The amount of vertical blur. Valid values are 0 to 255.0 (floating point). The default value is 4.0.

The color of the shadow. Valid values are in hexadecimal format 0xRRGGBB. The default value is 0x000000.

The offset distance for the shadow, in pixels. The default value is 4.0 (floating point).

Indicates whether or not the object is hidden. The value true indicates that the object itself is not drawn; only the shadow is visible. The default is false (the object is shown).

Indicates whether or not the shadow is an inner shadow. The value true indicates an inner shadow. The default is false, an outer shadow (a shadow around the outer edges of the object).

Applies a knockout effect (true), which effectively makes the object's fill transparent and reveals the background color of the document. The default is false (no knockout).

The number of times to apply the filter. The default value is BitmapFilterQuality.LOW, which is equivalent to applying the filter once. The value BitmapFilterQuality.MEDIUM applies the filter twice; the value BitmapFilterQuality.HIGH applies it three times. Filters with lower values are rendered more quickly.

For most applications, a quality value of low, medium, or high is sufficient. Although you can use additional numeric values up to 15 to achieve different effects, higher values are rendered more slowly. Instead of increasing the value of quality, you can often get a similar effect, and with faster rendering, by simply increasing the values of the blurX and blurY properties.

Related API Elements

The strength of the imprint or spread. The higher the value, the more color is imprinted and the stronger the contrast between the shadow and the background. Valid values are from 0 to 255.0. The default is 1.0.

Creates a new DropShadowFilter instance with the specified parameters.

Related API Elements

Returns a copy of this filter object.

1. Declare three properties that are used to draw the square to which the filter is applied.
2. Create the constructor function. The constructor calls the draw() method, which uses methods of the Graphics class accessed through the graphics property of Sprite to draw an orange square.
3. In the constructor, declare a variable filter as a BitmapFilter object and assign it to the return value of a call to getBitmapFilter(). The getBitmapFilter() method defines the drop shadow filter used.
4. Create a new Array object myFilters and add filter to the array. Assign the myFilters array to the filters property of the DropShadowFilterExample object. This applies all filters found in myFilters, which in this case is only filter.

package {
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.filters.BitmapFilter;
    import flash.filters.BitmapFilterQuality;
    import flash.filters.DropShadowFilter;

    public class DropShadowFilterExample extends Sprite {
        private var bgColor:uint = 0xFFCC00;
        private var size:uint    = 80;
        private var offset:uint  = 50;

        public function DropShadowFilterExample() {
            draw();
            var filter:BitmapFilter = getBitmapFilter();
            var myFilters:Array = new Array();
            myFilters.push(filter);
            filters = myFilters;
        }

        private function getBitmapFilter():BitmapFilter {
            var color:Number = 0x000000;
            var angle:Number = 45;
            var alpha:Number = 0.8;
            var blurX:Number = 8;
            var blurY:Number = 8;
            var distance:Number = 15;
            var strength:Number = 0.65;
            var inner:Boolean = false;
            var knockout:Boolean = false;
            var quality:Number = BitmapFilterQuality.HIGH;
            return new DropShadowFilter(distance,
                                        angle,
                                        color,
                                        alpha,
                                        blurX,
                                        blurY,
                                        strength,
                                        quality,
                                        inner,
                                        knockout);
        }

        private function draw():void {
            graphics.beginFill(bgColor);
            graphics.drawRect(offset, offset, size, size);
            graphics.endFill();
        }
    }
}