//----------------------------------------------------------------------------
// $Id: TransferItem.hpp,v 1.4 2010/01/18 00:19:54 philw Exp $
//----------------------------------------------------------------------------

#ifndef TransferItemINCLUDED
#define TransferItemINCLUDED

#ifndef CallbackINCLUDED
# include "Callback.hpp"
#endif

#ifndef SupplyINCLUDED
# include "Supply.hpp"
#endif

#ifndef AccountItemINCLUDED
#include "AccountItem.hpp"
#endif

#include <Q3Canvas>
#include <QImage>
#include <QPixmap>
#include <QColor>
#include <QFont>
#include <Q3PointArray>

class SimObj;
class Slot;
class LinkDisplayInfo;

//----------------------------------------------------------------------------
// class
//
// A TransferItem is a derived QCanvasItem that represents a supply between two
// accounts on the same simulation object as a Bezier line with an arrowhead
// on the demand-side. 
//
// In an ideal world this would have be derived from SupplyItem, since it 
// does represent a supply. However, a SupplyItem is QCanvasLine while this
// is a QCanvasRectangle for drawing/updating purposes. 
//----------------------------------------------------------------------------

class TransferItem: public Q3CanvasRectangle
{
public:
   
   enum AccountRTTI
   {
      RIVERWARE_ITEM = 2000
   };

   TransferItem(Supply *supply, AccountItem *acct1, AccountItem *acct2, 
                Q3Canvas *canvas);
   virtual ~TransferItem();

   void update();
   void scale(double sx, double sy);

   void show();
   void hide();

   Supply* supply() { return _supply; }

   void setStyle(const LinkDisplayInfo &info);

   bool hit( const QPoint&) const;
   virtual int rtti() const { return RIVERWARE_ITEM; }

protected:

   QPoint closestPoint(const QPoint &e1, const QPoint &e2, 
                       const QPoint &p) const;
   
   void drawShape( QPainter & );

private:

   Supply      *_supply;

   AccountItem *_supplyAccount;
   AccountItem *_destAccount;

   int  _lineWidth;

   const int _ARC_HEIGHT;
   const int _ARC_WIDTH;

   Q3PointArray _points;

   Q3CanvasPolygon *_arrowhead;
   const int _ARROW_LENGTH;
   const int _ARROW_WIDTH;
};

#endif