package {
          import flash.display.Sprite;
          import flash.display.StageAlign;
          import flash.display.StageScaleMode;
          import flash.events.Event;
          import flash.geom.Point;
  
          public class @ax-animation-ch14-MultiSegmentReach extends Sprite
          {
                  private var segments:Array;
                  private var numSegments:uint = 6;
                  
                  public function @ax-animation-ch14-MultiSegmentReach()
                  {
                          init();
                  }
                  
                  private function init():void
                  {
                          stage.align = StageAlign.TOP_LEFT;
                          stage.scaleMode = StageScaleMode.NO_SCALE;
                          segments = new Array();
                          for(var i:uint = 0; i < numSegments; i++)
                          {
                                  var segment:animation_ch14_Segment = new animation_ch14_Segment(50, 10);
                                  addChild(segment);
                                  segments.push(segment);
                          }
                          segment.x = stage.stageWidth / 2;
                          segment.y = stage.stageHeight / 2;
                          addEventListener(Event.ENTER_FRAME, onEnterFrame);
                  }
                  
                  private function onEnterFrame(event:Event):void
                  {
                          var target:Point = reach(segments[0], mouseX, mouseY);
                          for(var i:uint = 1; i < numSegments; i++)
                          {
                                  var segment:animation_ch14_Segment = segments[i];
                                  target = reach(segment, target.x, target.y);
                          }
                          for(i = numSegments - 1; i > 0; i--)
                          {
                                  var segmentA:animation_ch14_Segment = segments[i];
                                  var segmentB:animation_ch14_Segment = segments[i - 1];
                                  position(segmentB, segmentA);
                          }
                  }
                  
                  private function reach(segment:animation_ch14_Segment, xpos:Number, ypos:Number):Point
                  {
                          var dx:Number = xpos - segment.x;
                          var dy:Number = ypos - segment.y;
                          var angle:Number = Math.atan2(dy, dx);
                          segment.rotation = angle * 180 / Math.PI;
                          
                          var w:Number = segment.getPin().x - segment.x;
                          var h:Number = segment.getPin().y - segment.y;
                          var tx:Number = xpos - w;
                          var ty:Number = ypos - h;
                          return new Point(tx, ty);
                  }
                  
                  private function position(segmentA:animation_ch14_Segment, segmentB:animation_ch14_Segment):void
                  {
                          segmentA.x = segmentB.getPin().x;
                          segmentA.y = segmentB.getPin().y;
                  }
          }
  }