utils : slope

/**
 * Copyright nicoptere ( http://wonderfl.net/user/nicoptere )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/ze2y
 */

package 
{
    import flash.display.Sprite;
    import flash.events.Event;
	import flash.geom.Point;

    public class Slope extends Sprite 
	{
		
        public function Slope() 
        {
            
            addEventListener( Event.ENTER_FRAME, findSlope );
            
        }
        
        public function slope( p0:Point, p1:Point ):Number
        {	
			return ( p1.y - p0.y ) / ( p1.x - p0.x );	
		}
	
        private function findSlope( e:Event ):void 
        {
			var c:Point = new Point( stage.stageWidth * .5, stage.stageHeight * .5 );
			var p:Point = new Point( stage.mouseX, stage.mouseY );
	 
			var slope:Number = slope( c, p );
	 
			var color:uint = ( slope > 0 ) ? 0xFF0000 : ( ( slope == 0 ) ? 0x0000FF : 0x00FF00 );
			graphics.clear();
			graphics.lineStyle( 0, color );
			graphics.moveTo( c.x, c.y );
			graphics.lineTo( p.x, p.y );
        }
    }
}