// Example:  Glow Filter
package
{
	import flash.display.*;
	import flash.events.*;
	import flash.filters.*;
	
	public class Wk9GlowFilter extends MovieClip 
	{
		// Create a new GlowFilter object with a color of red, 
		// a wider blur, blurX == 5, than the height, blurY == 2,
		// and set knockout to true, so the center shows what's behind it 
		var gf:GlowFilter = new GlowFilter(0xbe1313,100,5,2,4,2,false,true);
	
		// Boolean variable to keep track of when we're increasing
    	// the height and width of the blur and when we're decreasing it
		var blurUp:Boolean = true;
		
		sun.filters = [gf];
		
		function Wk9GlowFilter( ) 
		{
		// Add the GlowFilter within an array to the sun MovieClip
		// Note: You could put many different kinds of filters 
		// in an array and add them to an object
		
		
		// Add a frame event that will change the 
		// blur height and width at each frame
		sun.addEventListener( Event.ENTER_FRAME, glowmore );
		
		// Add a listener to set the knockout of the filter to false 
		// when the mouse is over the sun, 
		// so that the sun will instead show what's behind it
		sun.addEventListener( MouseEvent.MOUSE_OVER, knockoutFalse );
		
		// Add a listener to set the knockout of the filter to true 
		// when the mouse moves off the sun, 
		// so that what's behind the sun will show
		sun.addEventListener( MouseEvent.MOUSE_OUT, knockoutTrue );
		
		}  // end constructor
		
		function glowmore(evt: Event)
		{
			// The width of the blur will vary betwee 5 and 50
			if (gf.blurX == 5)
			{
				blurUp = true;
			}
			else if ( gf.blurX == 50 )
			{
				blurUp = false;
			}
			
			// Increase or decrease the width of the blur more than the height 
			if (blurUp == true)
			{
				gf.blurY +=  0.1;
				gf.blurX +=  0.5;
			}
			else
			{
				gf.blurY -=  0.1;
				gf.blurX -=  0.5;
			}
			
			// Add the changed filter to the sun Movieclip
			sun.filters = [gf];
		}


		function knockoutFalse(evt: MouseEvent)
		{
			gf.knockout = false;
			sun.filters = [gf];
		}
		
		
		function knockoutTrue(evt: MouseEvent)
		{
			gf.knockout = true;
			sun.filters = [gf];
		}
		
	}
}