package 
  {
    import flash.events.MouseEvent;
    import mx.core.UIComponent;
    
    public class @ax-graphic-flex-diagram-class-Line extends UIComponent
    {
      private var thicknessNumber:uint = 2;
      private var alphaNumber:uint = 4.0;
      private var arrowWidth:int = 4;
      private var arrowHeight:int = 8;
   // x1,y1,x2,y2 this points are coordinate of line first point x,y and second 
   // point x,y  positions on the screen
      private var x1:int;
      private var y1:int;
      private var x2:int;
      private var y2:int;
      private var color:uint = 0x000000;
  //  this box referance for find line distance
      private var fromBox:graphic_flex_diagram_class_Box;
      private var toBox:graphic_flex_diagram_class_Box;
  //  this boolean variable understand selection on,off    
      private var isSelect:Boolean=false;
      
      public function @ax-graphic-flex-diagram-class-Line(){
        super();
        this.addEventListener(MouseEvent.CLICK,mouseClick);
      }
      public function setFromBox(value:graphic_flex_diagram_class_Box):void{
        this.fromBox = value;
      }
      public function setToBox(value:graphic_flex_diagram_class_Box):void{
        this.toBox = value;
      }
            public function getX1():int{
              return this.x1;
            }
            public function setX1(value:int):void{
              this.x1 = value;
            }
            public function getY1():int{
              return this.y1;
            }
            public function setY1(value:int):void{
              this.y1 = value;
            }
            public function getX2():int{
              return this.x2;
            }
            public function setX2(value:int):void{                
              this.x2 = value;
            }
            public function getY2():int{
              return this.y2;
            }
            public function setY2(value:int):void{
              this.y2 = value;
            }
            public function setId(value:String):void{
              this.id = value;
            }
            public function getId():String{
              return this.id;
            }
      public function clear():void{
        graphics.clear();
      }
      public function mouseClick(event:MouseEvent):void{
        select();
      }
  //  this method select line 
      public function select():void{
        if (!this.isSelect){
          this.color = 0xff0000;
          this.isSelect = true;
        }
        else{
          this.color = 0x000000;
          this.isSelect = false;
        }
        draw();
      }
  //  this method draw line on UIComponent graphics. 
      public function draw():void{
        if(name != "templateLine"){
          calculateCoordinate();
        }
              graphics.clear();
              //this transparent line for easy selection
              graphics.lineStyle(8,color,0.0);
              graphics.moveTo(getX1(),getY1());
              graphics.lineTo(getX2(),getY2());
              //this is real line
              graphics.lineStyle(thicknessNumber,color,alphaNumber);
              graphics.moveTo(getX1(),getY1());
              graphics.lineTo(getX2(),getY2());
              createArrow();
      }
             //Draw the arrow
            public function createArrow():void{
              var angle:Number = Math.atan2(getY2()-getY1(), getX2()-getX1());
              graphics.lineTo(getX2()-arrowHeight*Math.cos(angle)-arrowWidth*Math.sin(angle),
                                                                            getY2()-arrowHeight*Math.sin(angle)+arrowWidth*Math.cos(angle));
              graphics.lineTo(getX2(), getY2());
              graphics.lineTo(getX2()-arrowHeight*Math.cos(angle)+arrowWidth*Math.sin(angle),        
                                                                            getY2()-arrowHeight*Math.sin(angle)-arrowWidth*Math.cos(angle));                                                                                
            }
            
                  //this method find which way "from" box sides.
            public function getDrawDirection():String{
              var drawDirection :String;
              var boxFromX2:int = fromBox.getX()+fromBox.getWidth();
              var boxFromY2:int = fromBox.getY()+fromBox.getHeight();
              var boxToX2:int = toBox.getX()+toBox.getWidth();
              var boxToY2:int = toBox.getY()+toBox.getHeight();
                    
              if (fromBox.getX()>boxToX2 && boxFromY2<toBox.getY()){
                      drawDirection = "RIGHT_TOP";
              }
              else if (fromBox.getX()>boxToX2 && fromBox.getY()>boxToY2){
                drawDirection  = "RIGHT_BOTTOM";
              }
              else if (boxFromX2<toBox.getX() && fromBox.getY()>boxToY2){
                drawDirection  = "LEFT_BOTTOM";
              }
              else if (boxFromX2<toBox.getX() && boxFromY2<toBox.getY()){
                drawDirection  = "LEFT_TOP";
              }
              else if (fromBox.getX()>boxToX2){
                drawDirection  = "RIGHT";
              }
              else if (boxFromY2<toBox.getY()){
                drawDirection  = "TOP";
              }
              else if (fromBox.getY()>boxToY2){
                drawDirection  = "BOTTOM";
              }
              else if (boxFromX2<toBox.getX()){
                drawDirection  = "LEFT";
              }
              return drawDirection;
            }
            //this methos calculate coordinate for draw line. it use two side of box distance
            private function calculateCoordinate():void{
              var drawDirection:String = getDrawDirection();
              var boxFromX2:int = fromBox.getX()+fromBox.getWidth();
              var boxFromY2:int = fromBox.getY()+fromBox.getHeight();
              var boxToX2:int = toBox.getX()+toBox.getWidth();
              var boxToY2:int = toBox.getY()+toBox.getHeight();
              var diffY:int = 0;
              var diffX:int = 0;
              
              if (drawDirection =="BOTTOM" || drawDirection =="TOP")
              {
                      if (fromBox.getX()<=toBox.getX() && boxFromX2>=boxToX2){                                        
                        diffX =(toBox.getWidth())/2;
                        diffX = toBox.getX() + diffX;                                
                      }
                      else if (fromBox.getX()>toBox.getX() && boxFromX2>boxToX2){                                        
                        diffX =(boxToX2 - fromBox.getX())/2;
                        diffX = fromBox.getX() + diffX;                                
                }
                else if (fromBox.getX()<toBox.getX() && boxFromX2<boxToX2){                                        
                        diffX =(boxFromX2 - toBox.getX())/2;
                        diffX = toBox.getX() + diffX;                                
                      }
                      else if (fromBox.getX()>toBox.getX() && boxFromX2<boxToX2){                                        
                        diffX =(fromBox.getWidth())/2;
                        diffX = fromBox.getX() + diffX;
                      }
                if (diffX == 0){
                        diffX = fromBox.getX() + (fromBox.getWidth()/2);
                      }
              }
              if (drawDirection =="RIGHT" || drawDirection =="LEFT" ){                                
                      if (fromBox.getY()<=toBox.getY() && boxFromY2>=boxToY2){                                
                        diffY =(boxToY2 - toBox.getY())/2;                                        
                        diffY = toBox.getY() + diffY;                                                
                      }
                      else if (fromBox.getY()>toBox.getY() && boxFromY2>boxToY2){                                        
                        diffY =(boxToY2 - fromBox.getY())/2;
                        diffY = fromBox.getY() + diffY;
                      }
                      else if (fromBox.getY()<toBox.getY() && boxFromY2<boxToY2){                                        
                  diffY =(boxFromY2 - toBox.getY())/2;
                        diffY = toBox.getY() + diffY;                                                                
                      }
                      else if (fromBox.getY()>toBox.getY() && boxFromY2<boxToY2){                                        
                        diffY =(fromBox.getHeight())/2;
                        diffY = fromBox.getY() + diffY;                                                                                                                        
                      }                                
              }
              switch (drawDirection ){
                case "RIGHT_BOTTOM":
                      this.x1 = fromBox.getX()+diffX;
                      this.y1 = fromBox.getY();
                      this.x2 = boxToX2;
                      this.y2 = boxToY2-diffY;                                
                    break;
                    case "RIGHT_TOP":
                      this.x1 = fromBox.getX();
                      this.y1 = boxFromY2-diffY;
                      this.x2 = boxToX2-diffX;
                      this.y2 = toBox.getY();                                
                    break;
                    case "LEFT_BOTTOM":
                      this.x1 = boxFromX2-diffX;
                      this.y1 = fromBox.getY() ;
                      this.x2 = toBox.getX();
                      this.y2 = boxToY2-diffY;                                
                    break;                                        
                    case "LEFT_TOP":
                      this.x1 = boxFromX2;
                      this.y1 = boxFromY2-diffY;
                      this.x2 = toBox.getX()+diffX;
                      this.y2 = toBox.getY();                                
                    break;                                        
                    case "RIGHT":
                      this.x1 = fromBox.getX();
                      this.y1 = diffY;
                      this.x2 = boxToX2;
                      this.y2 = diffY;                        
                    break;
                    case "TOP":
                      this.x1 = diffX;
                      this.y1 = boxFromY2;
                      this.x2 = diffX;
                      this.y2 = toBox.getY();                                
                    break;
                    case "BOTTOM":
                      this.x1= diffX;
                      this.y1= fromBox.getY();
                      this.x2= diffX;
                      this.y2= boxToY2;                                
                    break;
                    case "LEFT":
                      this.x1= boxFromX2;
                      this.y1= diffY;
                      this.x2= toBox.getX();
                      this.y2= diffY;        
                    break;
              }
            }
    }
  }