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

The amount of horizontal blur. Valid values are 0 to 255 (floating point). The default value is 6. Values that are a power of 2 (such as 2, 4, 8, 16, and 32) are optimized to render more quickly than other values.

The amount of vertical blur. Valid values are 0 to 255 (floating point). The default value is 6. Values that are a power of 2 (such as 2, 4, 8, 16, and 32) are optimized to render more quickly than other values.

The color of the glow. Valid values are in the hexadecimal format 0xRRGGBB. The default value is 0xFF0000.

Specifies whether the glow is an inner glow. The value true indicates an inner glow. The default is false, an outer glow (a glow around the outer edges of the object).

Specifies whether the object has a knockout effect. A value of true makes the object's fill transparent and reveals the background color of the document. The default value is false (no knockout effect).

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.

See also

The strength of the imprint or spread. The higher the value, the more color is imprinted and the stronger the contrast between the glow and the background. Valid values are 0 to 255. The default is 2.

Initializes a new GlowFilter instance with the specified parameters.

See also

Returns a copy of this filter object.

1. Import the required classes.
2. Declare three properties used in the draw method, which uses methods of the Graphics class accessed through the graphics property of Sprite to draw an orange square.
3. Create the constructor function, which does the following:
   • Calls the draw method.
   • Creates a new BitmapFilter object named filter and assigns it the return value of a call to getBitmapFilter(), which defines the filter.
   • Creates a new array named myFilters and adds filter to it.
   • Assigns myFilters to the filters property of the BevelFilterExample 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.GlowFilter;

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

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

        private function getBitmapFilter():BitmapFilter {
            var color:Number = 0x33CCFF;
            var alpha:Number = 0.8;
            var blurX:Number = 35;
            var blurY:Number = 35;
            var strength:Number = 2;
            var inner:Boolean = false;
            var knockout:Boolean = false;
            var quality:Number = BitmapFilterQuality.HIGH;

            return new GlowFilter(color,
                                  alpha,
                                  blurX,
                                  blurY,
                                  strength,
                                  quality,
                                  inner,
                                  knockout);
        }

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