package flare.vis.data.render
{    
    /**
     * Utility class defining arrow types for directed edges.
     */
    public class ArrowType
    {
        /** Indicates that no arrows should be drawn. */
        public static const NONE:String = "none";
        /** Indicates that a closed triangular arrow head should be drawn. */
        public static const TRIANGLE:String = "triangle";
        /** Indicates that two lines should be used to draw the arrow head. */
        public static const LINES:String = "lines";
        
        /**
         * This constructor will throw an error, as this is an abstract class. 
         */
        public function ArrowType()
        {
            throw new Error("This is an abstract class.");
        }

    } // end of class ArrowType
}