flash on 2009-8-17

/**
 * Copyright resistor ( http://wonderfl.net/user/resistor )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/5GUn
 */

# class Arrow
# {
#     public var img:DisplayImage;
#     public var x:int, y:int;
#     public var vx:Number = 0, vy:Number = 0, ax:Number = 0, ay:Number = 0;
#     public var rot:int = 0, speed:int = 0;
#     private const MULTIPLY:Number = 64 / Math.PI;
#     
#     function Arrow(x:int, y:int) {
#         this.x = x;
#         this.y = y;
#     }
#     
#     public function step(col:uint):void
#     {
#         ax += ( (col      & 0xff) - 0x80 ) * .0005;
#         ay += ( (col >> 8 & 0xff) - 0x80 ) * .0005;
#         vx += ax;
#         vy += ay;
#         x += vx;
#         y += vy;
#         
#         rot = (128 + Math.atan2( vy, vx )* MULTIPLY) & 127;
#         speed = Math.min(ALPHA_STEPS-1, (vx*vx + vy*vy));
#         img = rotArr[rot + ROT_STEPS * speed];
#         
#         ax *= .96;
#         ay *= .96;
#         vx *= .92;
#         vy *= .92;
#         
#         ( x > stageWidth ) ? x = 0 : ( x < 0 ) ? x = stageWidth : 0;
#         ( y > stageHeight ) ? y = 0 : ( y < 0 ) ? y = stageHeight : 0;
#     }
# }